Merge remote-tracking branch 'queatz/sqlite-map'

src/map.cpp

@@ -29,12 +29,21 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mapgen.h"
 #include "nodemetadata.h"
 
-extern "C" {
-	#include "sqlite3.h"
-}
 /*
 	SQLite format specification:
 	- Initially only replaces sectors/ and sectors2/
+	
+	If map.sqlite does not exist in the save dir
+	or the block was not found in the database
+	the map will try to load from sectors folder.
+	In either case, map.sqlite will be created
+	and all future saves will save there.
+	
+	Structure of map.sqlite:
+	Tables:
+		blocks
+			(PK) INT pos
+			BLOB data
 */
 
 /*
@@ -1408,6 +1417,8 @@ void Map::timerUpdate(float dtime, float unload_timeout,
 
 		core::list<MapBlock*> blocks;
 		sector->getBlocks(blocks);
+		
+		beginSave();
 		for(core::list<MapBlock*>::Iterator i = blocks.begin();
 				i != blocks.end(); i++)
 		{
@@ -1440,6 +1451,7 @@ void Map::timerUpdate(float dtime, float unload_timeout,
 				all_blocks_deleted = false;
 			}
 		}
+		endSave();
 
 		if(all_blocks_deleted)
 		{
@@ -1873,7 +1885,10 @@ void Map::nodeMetadataStep(float dtime,
 ServerMap::ServerMap(std::string savedir):
 	Map(dout_server),
 	m_seed(0),
-	m_map_metadata_changed(true)
+	m_map_metadata_changed(true),
+	m_database(NULL),
+	m_database_read(NULL),
+	m_database_write(NULL)
 {
 	dstream<<__FUNCTION_NAME<<std::endl;
 
@@ -2001,6 +2016,16 @@ ServerMap::~ServerMap()
 				<<", exception: "<<e.what()<<std::endl;
 	}
 
+	/*
+		Close database if it was opened
+	*/
+	if(m_database_read)
+		sqlite3_finalize(m_database_read);
+	if(m_database_write)
+		sqlite3_finalize(m_database_write);
+	if(m_database)
+		sqlite3_close(m_database);
+
 #if 0
 	/*
 		Free all MapChunks
@@ -2314,6 +2339,7 @@ ServerMapSector * ServerMap::createSector(v2s16 p2d)
 	/*
 		Try to load metadata from disk
 	*/
+#if 0
 	if(loadSectorMeta(p2d) == true)
 	{
 		ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
@@ -2324,7 +2350,7 @@ ServerMapSector * ServerMap::createSector(v2s16 p2d)
 		}
 		return sector;
 	}
-
+#endif
 	/*
 		Do not create over-limit
 	*/
@@ -2766,6 +2792,75 @@ plan_b:
 	//return (s16)level;
 }
 
+void ServerMap::createDatabase() {
+	int e;
+	assert(m_database);
+	e = sqlite3_exec(m_database,
+		"CREATE TABLE IF NOT EXISTS `blocks` ("
+			"`pos` INT NOT NULL PRIMARY KEY,"
+			"`data` BLOB"
+		");"
+	, NULL, NULL, NULL);
+	if(e == SQLITE_ABORT)
+		throw FileNotGoodException("Could not create database structure");
+	else
+		dstream<<"Server: Database structure was created";
+}
+
+void ServerMap::verifyDatabase() {
+	if(m_database)
+		return;
+	
+	{
+		std::string dbp = m_savedir + "/map.sqlite";
+		bool needs_create = false;
+		int d;
+		
+		/*
+			Open the database connection
+		*/
+	
+		createDirs(m_savedir);
+	
+		if(!fs::PathExists(dbp))
+			needs_create = true;
+	
+		d = sqlite3_open_v2(dbp.c_str(), &m_database, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL);
+		if(d != SQLITE_OK) {
+			dstream<<"WARNING: Database failed to open: "<<sqlite3_errmsg(m_database)<<std::endl;
+			throw FileNotGoodException("Cannot open database file");
+		}
+		
+		if(needs_create)
+			createDatabase();
+	
+		d = sqlite3_prepare(m_database, "SELECT `data` FROM `blocks` WHERE `pos`=? LIMIT 1", -1, &m_database_read, NULL);
+		if(d != SQLITE_OK) {
+			dstream<<"WARNING: Database read statment failed to prepare: "<<sqlite3_errmsg(m_database)<<std::endl;
+			throw FileNotGoodException("Cannot prepare read statement");
+		}
+		
+		d = sqlite3_prepare(m_database, "REPLACE INTO `blocks` VALUES(?, ?)", -1, &m_database_write, NULL);
+		if(d != SQLITE_OK) {
+			dstream<<"WARNING: Database write statment failed to prepare: "<<sqlite3_errmsg(m_database)<<std::endl;
+			throw FileNotGoodException("Cannot prepare write statement");
+		}
+		
+		dstream<<"Server: Database opened"<<std::endl;
+	}
+}
+
+bool ServerMap::loadFromFolders() {
+	if(!m_database && !fs::PathExists(m_savedir + "/map.sqlite"))
+		return true;
+	return false;
+}
+
+sqlite3_int64 ServerMap::getBlockAsInteger(const v3s16 pos) {
+	return (sqlite3_int64)pos.Z*16777216 +
+		(sqlite3_int64)pos.Y*4096 + (sqlite3_int64)pos.X;
+}
+
 void ServerMap::createDirs(std::string path)
 {
 	if(fs::CreateAllDirs(path) == false)
@@ -2869,6 +2964,7 @@ void ServerMap::save(bool only_changed)
 	u32 block_count = 0;
 	u32 block_count_all = 0; // Number of blocks in memory
 	
+	beginSave();
 	core::map<v2s16, MapSector*>::Iterator i = m_sectors.getIterator();
 	for(; i.atEnd() == false; i++)
 	{
@@ -2883,6 +2979,8 @@ void ServerMap::save(bool only_changed)
 		core::list<MapBlock*> blocks;
 		sector->getBlocks(blocks);
 		core::list<MapBlock*>::Iterator j;
+		
+		//sqlite3_exec(m_database, "BEGIN;", NULL, NULL, NULL);
 		for(j=blocks.begin(); j!=blocks.end(); j++)
 		{
 			MapBlock *block = *j;
@@ -2901,8 +2999,10 @@ void ServerMap::save(bool only_changed)
 						<<block->getPos().Z<<")"
 						<<std::endl;*/
 			}
+		//sqlite3_exec(m_database, "COMMIT;", NULL, NULL, NULL);
 		}
 	}
+	endSave();
 
 	/*
 		Only print if something happened or saved whole map
@@ -3161,6 +3261,18 @@ bool ServerMap::loadSectorFull(v2s16 p2d)
 }
 #endif
 
+void ServerMap::beginSave() {
+	verifyDatabase();
+	if(sqlite3_exec(m_database, "BEGIN;", NULL, NULL, NULL) != SQLITE_OK)
+		dstream<<"WARNING: beginSave() failed, saving might be slow.";
+}
+
+void ServerMap::endSave() {
+	verifyDatabase();
+	if(sqlite3_exec(m_database, "COMMIT;", NULL, NULL, NULL) != SQLITE_OK)
+		dstream<<"WARNING: endSave() failed, map might not have saved.";
+}
+
 void ServerMap::saveBlock(MapBlock *block)
 {
 	DSTACK(__FUNCTION_NAME);
@@ -3180,6 +3292,8 @@ void ServerMap::saveBlock(MapBlock *block)
 	// Get destination
 	v3s16 p3d = block->getPos();
 	
+	
+#if 0
 	v2s16 p2d(p3d.X, p3d.Z);
 	std::string sectordir = getSectorDir(p2d);
 
@@ -3189,11 +3303,16 @@ void ServerMap::saveBlock(MapBlock *block)
 	std::ofstream o(fullpath.c_str(), std::ios_base::binary);
 	if(o.good() == false)
 		throw FileNotGoodException("Cannot open block data");
-
+#endif
 	/*
 		[0] u8 serialization version
 		[1] data
 	*/
+	
+	verifyDatabase();
+	
+	std::ostringstream o(std::ios_base::binary);
+	
 	o.write((char*)&version, 1);
 	
 	// Write basic data
@@ -3201,7 +3320,23 @@ void ServerMap::saveBlock(MapBlock *block)
 	
 	// Write extra data stored on disk
 	block->serializeDiskExtra(o, version);
-
+	
+	// Write block to database
+	
+	std::string tmp = o.str();
+	const char *bytes = tmp.c_str();
+	
+	if(sqlite3_bind_int64(m_database_write, 1, getBlockAsInteger(p3d)) != SQLITE_OK)
+		dstream<<"WARNING: Block position failed to bind: "<<sqlite3_errmsg(m_database)<<std::endl;
+	if(sqlite3_bind_blob(m_database_write, 2, (void *)bytes, o.tellp(), NULL) != SQLITE_OK) // TODO this mught not be the right length
+		dstream<<"WARNING: Block data failed to bind: "<<sqlite3_errmsg(m_database)<<std::endl;
+	int written = sqlite3_step(m_database_write);
+	if(written != SQLITE_DONE)
+		dstream<<"WARNING: Block failed to save ("<<p3d.X<<", "<<p3d.Y<<", "<<p3d.Z<<") "
+		<<sqlite3_errmsg(m_database)<<std::endl;
+	// Make ready for later reuse
+	sqlite3_reset(m_database_write);
+	
 	// We just wrote it to the disk so clear modified flag
 	block->resetModified();
 }
@@ -3282,12 +3417,111 @@ void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSecto
 	}
 }
 
+void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool save_after_load)
+{
+	DSTACK(__FUNCTION_NAME);
+
+	try {
+		std::istringstream is(*blob, std::ios_base::binary);
+		
+		u8 version = SER_FMT_VER_INVALID;
+		is.read((char*)&version, 1);
+
+		if(is.fail())
+			throw SerializationError("ServerMap::loadBlock(): Failed"
+					" to read MapBlock version");
+
+		/*u32 block_size = MapBlock::serializedLength(version);
+		SharedBuffer<u8> data(block_size);
+		is.read((char*)*data, block_size);*/
+
+		// This will always return a sector because we're the server
+		//MapSector *sector = emergeSector(p2d);
+
+		MapBlock *block = NULL;
+		bool created_new = false;
+		block = sector->getBlockNoCreateNoEx(p3d.Y);
+		if(block == NULL)
+		{
+			block = sector->createBlankBlockNoInsert(p3d.Y);
+			created_new = true;
+		}
+		
+		// Read basic data
+		block->deSerialize(is, version);
+
+		// Read extra data stored on disk
+		block->deSerializeDiskExtra(is, version);
+		
+		// If it's a new block, insert it to the map
+		if(created_new)
+			sector->insertBlock(block);
+		
+		/*
+			Save blocks loaded in old format in new format
+		*/
+
+		if(version < SER_FMT_VER_HIGHEST || save_after_load)
+		{
+			saveBlock(block);
+		}
+		
+		// We just loaded it from, so it's up-to-date.
+		block->resetModified();
+
+	}
+	catch(SerializationError &e)
+	{
+		dstream<<"WARNING: Invalid block data in database "
+				<<" (SerializationError). "
+				<<"what()="<<e.what()
+				<<std::endl;
+				//" Ignoring. A new one will be generated.
+		assert(0);
+
+		// TODO: Copy to a backup database.
+	}
+}
+
 MapBlock* ServerMap::loadBlock(v3s16 blockpos)
 {
 	DSTACK(__FUNCTION_NAME);
 
 	v2s16 p2d(blockpos.X, blockpos.Z);
 
+	if(!loadFromFolders()) {
+		verifyDatabase();
+		
+		if(sqlite3_bind_int64(m_database_read, 1, getBlockAsInteger(blockpos)) != SQLITE_OK)
+			dstream<<"WARNING: Could not bind block position for load: "
+				<<sqlite3_errmsg(m_database)<<std::endl;
+		if(sqlite3_step(m_database_read) == SQLITE_ROW) {
+			/*
+				Make sure sector is loaded
+			*/
+			MapSector *sector = createSector(p2d);
+			
+			/*
+				Load block
+			*/
+			const char * data = (const char *)sqlite3_column_blob(m_database_read, 0);
+			size_t len = sqlite3_column_bytes(m_database_read, 0);
+			
+			std::string datastr(data, len);
+			
+			loadBlock(&datastr, blockpos, sector, false);
+
+			sqlite3_step(m_database_read);
+			// We should never get more than 1 row, so ok to reset
+			sqlite3_reset(m_database_read);
+
+			return getBlockNoCreateNoEx(blockpos);
+		}
+		sqlite3_reset(m_database_read);
+		
+		// Not found in database, try the files
+	}
+
 	// The directory layout we're going to load from.
 	//  1 - original sectors/xxxxzzzz/
 	//  2 - new sectors2/xxx/zzz/
@@ -3338,9 +3572,9 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
 		return NULL;
 
 	/*
-		Load block
+		Load block and save it to the database
 	*/
-	loadBlock(sectordir, blockfilename, sector, loadlayout != 2);
+	loadBlock(sectordir, blockfilename, sector, true);
 	return getBlockNoCreateNoEx(blockpos);
 }
 

src/map.h

@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <jmutexautolock.h>
 #include <jthread.h>
 #include <iostream>
+#include <sstream>
 
 #include "common_irrlicht.h"
 #include "mapnode.h"
@@ -31,6 +32,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "constants.h"
 #include "voxel.h"
 
+extern "C" {
+	#include "sqlite3.h"
+}
+
 class MapSector;
 class ServerMapSector;
 class ClientMapSector;
@@ -220,6 +225,10 @@ public:
 	//core::aabbox3d<s16> getDisplayedBlockArea();
 
 	//bool updateChangedVisibleArea();
+
+	// Call these before and after saving of many blocks
+	virtual void beginSave() {return;};
+	virtual void endSave() {return;};
 	
 	virtual void save(bool only_changed){assert(0);};
 	
@@ -361,6 +370,23 @@ public:
 	v3s16 getBlockPos(std::string sectordir, std::string blockfile);
 	static std::string getBlockFilename(v3s16 p);
 
+	/*
+		Database functions
+	*/
+	// Create the database structure
+	void createDatabase();
+	// Verify we can read/write to the database
+	void verifyDatabase();
+	// Get an integer suitable for a block
+	static sqlite3_int64 getBlockAsInteger(const v3s16 pos);
+
+	// Returns true if the database file does not exist
+	bool loadFromFolders();
+
+	// Call these before and after saving of blocks
+	void beginSave();
+	void endSave();
+
 	void save(bool only_changed);
 	//void loadAll();
 	
@@ -391,6 +417,8 @@ public:
 	// This will generate a sector with getSector if not found.
 	void loadBlock(std::string sectordir, std::string blockfile, MapSector *sector, bool save_after_load=false);
 	MapBlock* loadBlock(v3s16 p);
+	// Database version
+	void loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool save_after_load=false);
 
 	// For debug printing
 	virtual void PrintInfo(std::ostream &out);
@@ -419,6 +447,13 @@ private:
 		This is reset to false when written on disk.
 	*/
 	bool m_map_metadata_changed;
+	
+	/*
+		SQLite database and statements
+	*/
+	sqlite3 *m_database;
+	sqlite3_stmt *m_database_read;
+	sqlite3_stmt *m_database_write;
 };
 
 /*

src/sqlite/sqlite3.h

@@ -107,9 +107,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.7.6.3"
+#define SQLITE_VERSION        "3.7.7.1"
-#define SQLITE_VERSION_NUMBER 3007006
+#define SQLITE_VERSION_NUMBER 3007007
-#define SQLITE_SOURCE_ID      "2011-05-19 13:26:54 ed1da510a239ea767a01dc332b667119fa3c908e"
+#define SQLITE_SOURCE_ID      "2011-06-28 17:39:05 af0d91adf497f5f36ec3813f04235a6e195a605f"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -310,7 +310,7 @@ typedef int (*sqlite3_callback)(void*,int,char**, char**);
 ** argument.  ^If the callback function of the 3rd argument to
 ** sqlite3_exec() is not NULL, then it is invoked for each result row
 ** coming out of the evaluated SQL statements.  ^The 4th argument to
-** to sqlite3_exec() is relayed through to the 1st argument of each
+** sqlite3_exec() is relayed through to the 1st argument of each
 ** callback invocation.  ^If the callback pointer to sqlite3_exec()
 ** is NULL, then no callback is ever invoked and result rows are
 ** ignored.
@@ -375,7 +375,8 @@ SQLITE_API int sqlite3_exec(
 **
 ** New error codes may be added in future versions of SQLite.
 **
-** See also: [SQLITE_IOERR_READ | extended result codes]
+** See also: [SQLITE_IOERR_READ | extended result codes],
+** [sqlite3_vtab_on_conflict()] [SQLITE_ROLLBACK | result codes].
 */
 #define SQLITE_OK           0   /* Successful result */
 /* beginning-of-error-codes */
@@ -452,17 +453,21 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_IOERR_SHMOPEN           (SQLITE_IOERR | (18<<8))
 #define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
 #define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
+#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
+#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
 #define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
 #define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
 #define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
+#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
+#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
+#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))
 
 /*
 ** CAPI3REF: Flags For File Open Operations
 **
 ** These bit values are intended for use in the
 ** 3rd parameter to the [sqlite3_open_v2()] interface and
-** in the 4th parameter to the xOpen method of the
+** in the 4th parameter to the [sqlite3_vfs.xOpen] method.
-** [sqlite3_vfs] object.
 */
 #define SQLITE_OPEN_READONLY         0x00000001  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_READWRITE        0x00000002  /* Ok for sqlite3_open_v2() */
@@ -470,6 +475,7 @@ SQLITE_API int sqlite3_exec(
 #define SQLITE_OPEN_DELETEONCLOSE    0x00000008  /* VFS only */
 #define SQLITE_OPEN_EXCLUSIVE        0x00000010  /* VFS only */
 #define SQLITE_OPEN_AUTOPROXY        0x00000020  /* VFS only */
+#define SQLITE_OPEN_URI              0x00000040  /* Ok for sqlite3_open_v2() */
 #define SQLITE_OPEN_MAIN_DB          0x00000100  /* VFS only */
 #define SQLITE_OPEN_TEMP_DB          0x00000200  /* VFS only */
 #define SQLITE_OPEN_TRANSIENT_DB     0x00000400  /* VFS only */
@@ -580,17 +586,18 @@ struct sqlite3_file {
 /*
 ** CAPI3REF: OS Interface File Virtual Methods Object
 **
-** Every file opened by the [sqlite3_vfs] xOpen method populates an
+** Every file opened by the [sqlite3_vfs.xOpen] method populates an
 ** [sqlite3_file] object (or, more commonly, a subclass of the
 ** [sqlite3_file] object) with a pointer to an instance of this object.
 ** This object defines the methods used to perform various operations
 ** against the open file represented by the [sqlite3_file] object.
 **
-** If the xOpen method sets the sqlite3_file.pMethods element 
+** If the [sqlite3_vfs.xOpen] method sets the sqlite3_file.pMethods element 
 ** to a non-NULL pointer, then the sqlite3_io_methods.xClose method
-** may be invoked even if the xOpen reported that it failed.  The
+** may be invoked even if the [sqlite3_vfs.xOpen] reported that it failed.  The
-** only way to prevent a call to xClose following a failed xOpen
+** only way to prevent a call to xClose following a failed [sqlite3_vfs.xOpen]
-** is for the xOpen to set the sqlite3_file.pMethods element to NULL.
+** is for the [sqlite3_vfs.xOpen] to set the sqlite3_file.pMethods element
+** to NULL.
 **
 ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or
 ** [SQLITE_SYNC_FULL].  The first choice is the normal fsync().
@@ -762,7 +769,8 @@ typedef struct sqlite3_mutex sqlite3_mutex;
 **
 ** An instance of the sqlite3_vfs object defines the interface between
 ** the SQLite core and the underlying operating system.  The "vfs"
-** in the name of the object stands for "virtual file system".
+** in the name of the object stands for "virtual file system".  See
+** the [VFS | VFS documentation] for further information.
 **
 ** The value of the iVersion field is initially 1 but may be larger in
 ** future versions of SQLite.  Additional fields may be appended to this
@@ -791,6 +799,7 @@ typedef struct sqlite3_mutex sqlite3_mutex;
 ** The zName field holds the name of the VFS module.  The name must
 ** be unique across all VFS modules.
 **
+** [[sqlite3_vfs.xOpen]]
 ** ^SQLite guarantees that the zFilename parameter to xOpen
 ** is either a NULL pointer or string obtained
 ** from xFullPathname() with an optional suffix added.
@@ -868,6 +877,7 @@ typedef struct sqlite3_mutex sqlite3_mutex;
 ** element will be valid after xOpen returns regardless of the success
 ** or failure of the xOpen call.
 **
+** [[sqlite3_vfs.xAccess]]
 ** ^The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
 ** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to
 ** test whether a file is readable and writable, or [SQLITE_ACCESS_READ]
@@ -892,7 +902,7 @@ typedef struct sqlite3_mutex sqlite3_mutex;
 ** method returns a Julian Day Number for the current date and time as
 ** a floating point value.
 ** ^The xCurrentTimeInt64() method returns, as an integer, the Julian
-** Day Number multipled by 86400000 (the number of milliseconds in 
+** Day Number multiplied by 86400000 (the number of milliseconds in 
 ** a 24-hour day).  
 ** ^SQLite will use the xCurrentTimeInt64() method to get the current
 ** date and time if that method is available (if iVersion is 2 or 
@@ -1114,9 +1124,9 @@ SQLITE_API int sqlite3_os_end(void);
 ** implementation of an application-defined [sqlite3_os_init()].
 **
 ** The first argument to sqlite3_config() is an integer
-** [SQLITE_CONFIG_SINGLETHREAD | configuration option] that determines
+** [configuration option] that determines
 ** what property of SQLite is to be configured.  Subsequent arguments
-** vary depending on the [SQLITE_CONFIG_SINGLETHREAD | configuration option]
+** vary depending on the [configuration option]
 ** in the first argument.
 **
 ** ^When a configuration option is set, sqlite3_config() returns [SQLITE_OK].
@@ -1226,6 +1236,7 @@ struct sqlite3_mem_methods {
 
 /*
 ** CAPI3REF: Configuration Options
+** KEYWORDS: {configuration option}
 **
 ** These constants are the available integer configuration options that
 ** can be passed as the first argument to the [sqlite3_config()] interface.
@@ -1238,7 +1249,7 @@ struct sqlite3_mem_methods {
 ** is invoked.
 **
 ** <dl>
-** <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
+** [[SQLITE_CONFIG_SINGLETHREAD]] <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Single-thread.  In other words, it disables
 ** all mutexing and puts SQLite into a mode where it can only be used
@@ -1249,7 +1260,7 @@ struct sqlite3_mem_methods {
 ** [SQLITE_ERROR] if called with the SQLITE_CONFIG_SINGLETHREAD
 ** configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_MULTITHREAD</dt>
+** [[SQLITE_CONFIG_MULTITHREAD]] <dt>SQLITE_CONFIG_MULTITHREAD</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Multi-thread.  In other words, it disables
 ** mutexing on [database connection] and [prepared statement] objects.
@@ -1263,7 +1274,7 @@ struct sqlite3_mem_methods {
 ** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
 ** SQLITE_CONFIG_MULTITHREAD configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_SERIALIZED</dt>
+** [[SQLITE_CONFIG_SERIALIZED]] <dt>SQLITE_CONFIG_SERIALIZED</dt>
 ** <dd>There are no arguments to this option.  ^This option sets the
 ** [threading mode] to Serialized. In other words, this option enables
 ** all mutexes including the recursive
@@ -1279,7 +1290,7 @@ struct sqlite3_mem_methods {
 ** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
 ** SQLITE_CONFIG_SERIALIZED configuration option.</dd>
 **
-** <dt>SQLITE_CONFIG_MALLOC</dt>
+** [[SQLITE_CONFIG_MALLOC]] <dt>SQLITE_CONFIG_MALLOC</dt>
 ** <dd> ^(This option takes a single argument which is a pointer to an
 ** instance of the [sqlite3_mem_methods] structure.  The argument specifies
 ** alternative low-level memory allocation routines to be used in place of
@@ -1287,7 +1298,7 @@ struct sqlite3_mem_methods {
 ** its own private copy of the content of the [sqlite3_mem_methods] structure
 ** before the [sqlite3_config()] call returns.</dd>
 **
-** <dt>SQLITE_CONFIG_GETMALLOC</dt>
+** [[SQLITE_CONFIG_GETMALLOC]] <dt>SQLITE_CONFIG_GETMALLOC</dt>
 ** <dd> ^(This option takes a single argument which is a pointer to an
 ** instance of the [sqlite3_mem_methods] structure.  The [sqlite3_mem_methods]
 ** structure is filled with the currently defined memory allocation routines.)^
@@ -1295,7 +1306,7 @@ struct sqlite3_mem_methods {
 ** routines with a wrapper that simulations memory allocation failure or
 ** tracks memory usage, for example. </dd>
 **
-** <dt>SQLITE_CONFIG_MEMSTATUS</dt>
+** [[SQLITE_CONFIG_MEMSTATUS]] <dt>SQLITE_CONFIG_MEMSTATUS</dt>
 ** <dd> ^This option takes single argument of type int, interpreted as a 
 ** boolean, which enables or disables the collection of memory allocation 
 ** statistics. ^(When memory allocation statistics are disabled, the 
@@ -1311,7 +1322,7 @@ struct sqlite3_mem_methods {
 ** allocation statistics are disabled by default.
 ** </dd>
 **
-** <dt>SQLITE_CONFIG_SCRATCH</dt>
+** [[SQLITE_CONFIG_SCRATCH]] <dt>SQLITE_CONFIG_SCRATCH</dt>
 ** <dd> ^This option specifies a static memory buffer that SQLite can use for
 ** scratch memory.  There are three arguments:  A pointer an 8-byte
 ** aligned memory buffer from which the scratch allocations will be
@@ -1327,9 +1338,9 @@ struct sqlite3_mem_methods {
 ** scratch memory beyond what is provided by this configuration option, then 
 ** [sqlite3_malloc()] will be used to obtain the memory needed.</dd>
 **
-** <dt>SQLITE_CONFIG_PAGECACHE</dt>
+** [[SQLITE_CONFIG_PAGECACHE]] <dt>SQLITE_CONFIG_PAGECACHE</dt>
 ** <dd> ^This option specifies a static memory buffer that SQLite can use for
-** the database page cache with the default page cache implemenation.  
+** the database page cache with the default page cache implementation.  
 ** This configuration should not be used if an application-define page
 ** cache implementation is loaded using the SQLITE_CONFIG_PCACHE option.
 ** There are three arguments to this option: A pointer to 8-byte aligned
@@ -1348,7 +1359,7 @@ struct sqlite3_mem_methods {
 ** be aligned to an 8-byte boundary or subsequent behavior of SQLite
 ** will be undefined.</dd>
 **
-** <dt>SQLITE_CONFIG_HEAP</dt>
+** [[SQLITE_CONFIG_HEAP]] <dt>SQLITE_CONFIG_HEAP</dt>
 ** <dd> ^This option specifies a static memory buffer that SQLite will use
 ** for all of its dynamic memory allocation needs beyond those provided
 ** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE].
@@ -1365,7 +1376,7 @@ struct sqlite3_mem_methods {
 ** The minimum allocation size is capped at 2^12. Reasonable values
 ** for the minimum allocation size are 2^5 through 2^8.</dd>
 **
-** <dt>SQLITE_CONFIG_MUTEX</dt>
+** [[SQLITE_CONFIG_MUTEX]] <dt>SQLITE_CONFIG_MUTEX</dt>
 ** <dd> ^(This option takes a single argument which is a pointer to an
 ** instance of the [sqlite3_mutex_methods] structure.  The argument specifies
 ** alternative low-level mutex routines to be used in place
@@ -1377,7 +1388,7 @@ struct sqlite3_mem_methods {
 ** [sqlite3_config()] with the SQLITE_CONFIG_MUTEX configuration option will
 ** return [SQLITE_ERROR].</dd>
 **
-** <dt>SQLITE_CONFIG_GETMUTEX</dt>
+** [[SQLITE_CONFIG_GETMUTEX]] <dt>SQLITE_CONFIG_GETMUTEX</dt>
 ** <dd> ^(This option takes a single argument which is a pointer to an
 ** instance of the [sqlite3_mutex_methods] structure.  The
 ** [sqlite3_mutex_methods]
@@ -1390,7 +1401,7 @@ struct sqlite3_mem_methods {
 ** [sqlite3_config()] with the SQLITE_CONFIG_GETMUTEX configuration option will
 ** return [SQLITE_ERROR].</dd>
 **
-** <dt>SQLITE_CONFIG_LOOKASIDE</dt>
+** [[SQLITE_CONFIG_LOOKASIDE]] <dt>SQLITE_CONFIG_LOOKASIDE</dt>
 ** <dd> ^(This option takes two arguments that determine the default
 ** memory allocation for the lookaside memory allocator on each
 ** [database connection].  The first argument is the
@@ -1400,18 +1411,18 @@ struct sqlite3_mem_methods {
 ** verb to [sqlite3_db_config()] can be used to change the lookaside
 ** configuration on individual connections.)^ </dd>
 **
-** <dt>SQLITE_CONFIG_PCACHE</dt>
+** [[SQLITE_CONFIG_PCACHE]] <dt>SQLITE_CONFIG_PCACHE</dt>
 ** <dd> ^(This option takes a single argument which is a pointer to
 ** an [sqlite3_pcache_methods] object.  This object specifies the interface
 ** to a custom page cache implementation.)^  ^SQLite makes a copy of the
 ** object and uses it for page cache memory allocations.</dd>
 **
-** <dt>SQLITE_CONFIG_GETPCACHE</dt>
+** [[SQLITE_CONFIG_GETPCACHE]] <dt>SQLITE_CONFIG_GETPCACHE</dt>
 ** <dd> ^(This option takes a single argument which is a pointer to an
 ** [sqlite3_pcache_methods] object.  SQLite copies of the current
 ** page cache implementation into that object.)^ </dd>
 **
-** <dt>SQLITE_CONFIG_LOG</dt>
+** [[SQLITE_CONFIG_LOG]] <dt>SQLITE_CONFIG_LOG</dt>
 ** <dd> ^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
 ** function with a call signature of void(*)(void*,int,const char*), 
 ** and a pointer to void. ^If the function pointer is not NULL, it is
@@ -1429,6 +1440,18 @@ struct sqlite3_mem_methods {
 ** In a multi-threaded application, the application-defined logger
 ** function must be threadsafe. </dd>
 **
+** [[SQLITE_CONFIG_URI]] <dt>SQLITE_CONFIG_URI
+** <dd> This option takes a single argument of type int. If non-zero, then
+** URI handling is globally enabled. If the parameter is zero, then URI handling
+** is globally disabled. If URI handling is globally enabled, all filenames
+** passed to [sqlite3_open()], [sqlite3_open_v2()], [sqlite3_open16()] or
+** specified as part of [ATTACH] commands are interpreted as URIs, regardless
+** of whether or not the [SQLITE_OPEN_URI] flag is set when the database
+** connection is opened. If it is globally disabled, filenames are
+** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
+** database connection is opened. By default, URI handling is globally
+** disabled. The default value may be changed by compiling with the
+** [SQLITE_USE_URI] symbol defined.
 ** </dl>
 */
 #define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
@@ -1447,6 +1470,7 @@ struct sqlite3_mem_methods {
 #define SQLITE_CONFIG_PCACHE       14  /* sqlite3_pcache_methods* */
 #define SQLITE_CONFIG_GETPCACHE    15  /* sqlite3_pcache_methods* */
 #define SQLITE_CONFIG_LOG          16  /* xFunc, void* */
+#define SQLITE_CONFIG_URI          17  /* int */
 
 /*
 ** CAPI3REF: Database Connection Configuration Options
@@ -1532,13 +1556,17 @@ SQLITE_API int sqlite3_extended_result_codes(sqlite3*, int onoff);
 **
 ** ^This routine returns the [rowid] of the most recent
 ** successful [INSERT] into the database from the [database connection]
-** in the first argument.  ^If no successful [INSERT]s
+** in the first argument.  ^As of SQLite version 3.7.7, this routines
+** records the last insert rowid of both ordinary tables and [virtual tables].
+** ^If no successful [INSERT]s
 ** have ever occurred on that database connection, zero is returned.
 **
-** ^(If an [INSERT] occurs within a trigger, then the [rowid] of the inserted
+** ^(If an [INSERT] occurs within a trigger or within a [virtual table]
-** row is returned by this routine as long as the trigger is running.
+** method, then this routine will return the [rowid] of the inserted
-** But once the trigger terminates, the value returned by this routine
+** row as long as the trigger or virtual table method is running.
-** reverts to the last value inserted before the trigger fired.)^
+** But once the trigger or virtual table method ends, the value returned 
+** by this routine reverts to what it was before the trigger or virtual
+** table method began.)^
 **
 ** ^An [INSERT] that fails due to a constraint violation is not a
 ** successful [INSERT] and does not change the value returned by this
@@ -2201,6 +2229,9 @@ SQLITE_API int sqlite3_set_authorizer(
 ** to signal SQLite whether or not the action is permitted.  See the
 ** [sqlite3_set_authorizer | authorizer documentation] for additional
 ** information.
+**
+** Note that SQLITE_IGNORE is also used as a [SQLITE_ROLLBACK | return code]
+** from the [sqlite3_vtab_on_conflict()] interface.
 */
 #define SQLITE_DENY   1   /* Abort the SQL statement with an error */
 #define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */
@@ -2323,7 +2354,7 @@ SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 /*
 ** CAPI3REF: Opening A New Database Connection
 **
-** ^These routines open an SQLite database file whose name is given by the
+** ^These routines open an SQLite database file as specified by the 
 ** filename argument. ^The filename argument is interpreted as UTF-8 for
 ** sqlite3_open() and sqlite3_open_v2() and as UTF-16 in the native byte
 ** order for sqlite3_open16(). ^(A [database connection] handle is usually
@@ -2350,7 +2381,7 @@ SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 ** sqlite3_open_v2() can take one of
 ** the following three values, optionally combined with the 
 ** [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX], [SQLITE_OPEN_SHAREDCACHE],
-** and/or [SQLITE_OPEN_PRIVATECACHE] flags:)^
+** [SQLITE_OPEN_PRIVATECACHE], and/or [SQLITE_OPEN_URI] flags:)^
 **
 ** <dl>
 ** ^(<dt>[SQLITE_OPEN_READONLY]</dt>
@@ -2369,9 +2400,8 @@ SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 ** </dl>
 **
 ** If the 3rd parameter to sqlite3_open_v2() is not one of the
-** combinations shown above or one of the combinations shown above combined
+** combinations shown above optionally combined with other
-** with the [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX],
+** [SQLITE_OPEN_READONLY | SQLITE_OPEN_* bits]
-** [SQLITE_OPEN_SHAREDCACHE] and/or [SQLITE_OPEN_PRIVATECACHE] flags,
 ** then the behavior is undefined.
 **
 ** ^If the [SQLITE_OPEN_NOMUTEX] flag is set, then the database connection
@@ -2386,6 +2416,11 @@ SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 ** [SQLITE_OPEN_PRIVATECACHE] flag causes the database connection to not
 ** participate in [shared cache mode] even if it is enabled.
 **
+** ^The fourth parameter to sqlite3_open_v2() is the name of the
+** [sqlite3_vfs] object that defines the operating system interface that
+** the new database connection should use.  ^If the fourth parameter is
+** a NULL pointer then the default [sqlite3_vfs] object is used.
+**
 ** ^If the filename is ":memory:", then a private, temporary in-memory database
 ** is created for the connection.  ^This in-memory database will vanish when
 ** the database connection is closed.  Future versions of SQLite might
@@ -2398,10 +2433,111 @@ SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 ** on-disk database will be created.  ^This private database will be
 ** automatically deleted as soon as the database connection is closed.
 **
-** ^The fourth parameter to sqlite3_open_v2() is the name of the
+** [[URI filenames in sqlite3_open()]] <h3>URI Filenames</h3>
-** [sqlite3_vfs] object that defines the operating system interface that
+**
-** the new database connection should use.  ^If the fourth parameter is
+** ^If [URI filename] interpretation is enabled, and the filename argument
-** a NULL pointer then the default [sqlite3_vfs] object is used.
+** begins with "file:", then the filename is interpreted as a URI. ^URI
+** filename interpretation is enabled if the [SQLITE_OPEN_URI] flag is
+** set in the fourth argument to sqlite3_open_v2(), or if it has
+** been enabled globally using the [SQLITE_CONFIG_URI] option with the
+** [sqlite3_config()] method or by the [SQLITE_USE_URI] compile-time option.
+** As of SQLite version 3.7.7, URI filename interpretation is turned off
+** by default, but future releases of SQLite might enable URI filename
+** interpretation by default.  See "[URI filenames]" for additional
+** information.
+**
+** URI filenames are parsed according to RFC 3986. ^If the URI contains an
+** authority, then it must be either an empty string or the string 
+** "localhost". ^If the authority is not an empty string or "localhost", an 
+** error is returned to the caller. ^The fragment component of a URI, if 
+** present, is ignored.
+**
+** ^SQLite uses the path component of the URI as the name of the disk file
+** which contains the database. ^If the path begins with a '/' character, 
+** then it is interpreted as an absolute path. ^If the path does not begin 
+** with a '/' (meaning that the authority section is omitted from the URI)
+** then the path is interpreted as a relative path. 
+** ^On windows, the first component of an absolute path 
+** is a drive specification (e.g. "C:").
+**
+** [[core URI query parameters]]
+** The query component of a URI may contain parameters that are interpreted
+** either by SQLite itself, or by a [VFS | custom VFS implementation].
+** SQLite interprets the following three query parameters:
+**
+** <ul>
+**   <li> <b>vfs</b>: ^The "vfs" parameter may be used to specify the name of
+**     a VFS object that provides the operating system interface that should
+**     be used to access the database file on disk. ^If this option is set to
+**     an empty string the default VFS object is used. ^Specifying an unknown
+**     VFS is an error. ^If sqlite3_open_v2() is used and the vfs option is
+**     present, then the VFS specified by the option takes precedence over
+**     the value passed as the fourth parameter to sqlite3_open_v2().
+**
+**   <li> <b>mode</b>: ^(The mode parameter may be set to either "ro", "rw" or
+**     "rwc". Attempting to set it to any other value is an error)^. 
+**     ^If "ro" is specified, then the database is opened for read-only 
+**     access, just as if the [SQLITE_OPEN_READONLY] flag had been set in the 
+**     third argument to sqlite3_prepare_v2(). ^If the mode option is set to 
+**     "rw", then the database is opened for read-write (but not create) 
+**     access, as if SQLITE_OPEN_READWRITE (but not SQLITE_OPEN_CREATE) had 
+**     been set. ^Value "rwc" is equivalent to setting both 
+**     SQLITE_OPEN_READWRITE and SQLITE_OPEN_CREATE. ^If sqlite3_open_v2() is 
+**     used, it is an error to specify a value for the mode parameter that is 
+**     less restrictive than that specified by the flags passed as the third 
+**     parameter.
+**
+**   <li> <b>cache</b>: ^The cache parameter may be set to either "shared" or
+**     "private". ^Setting it to "shared" is equivalent to setting the
+**     SQLITE_OPEN_SHAREDCACHE bit in the flags argument passed to
+**     sqlite3_open_v2(). ^Setting the cache parameter to "private" is 
+**     equivalent to setting the SQLITE_OPEN_PRIVATECACHE bit.
+**     ^If sqlite3_open_v2() is used and the "cache" parameter is present in
+**     a URI filename, its value overrides any behaviour requested by setting
+**     SQLITE_OPEN_PRIVATECACHE or SQLITE_OPEN_SHAREDCACHE flag.
+** </ul>
+**
+** ^Specifying an unknown parameter in the query component of a URI is not an
+** error.  Future versions of SQLite might understand additional query
+** parameters.  See "[query parameters with special meaning to SQLite]" for
+** additional information.
+**
+** [[URI filename examples]] <h3>URI filename examples</h3>
+**
+** <table border="1" align=center cellpadding=5>
+** <tr><th> URI filenames <th> Results
+** <tr><td> file:data.db <td> 
+**          Open the file "data.db" in the current directory.
+** <tr><td> file:/home/fred/data.db<br>
+**          file:///home/fred/data.db <br> 
+**          file://localhost/home/fred/data.db <br> <td> 
+**          Open the database file "/home/fred/data.db".
+** <tr><td> file://darkstar/home/fred/data.db <td> 
+**          An error. "darkstar" is not a recognized authority.
+** <tr><td style="white-space:nowrap"> 
+**          file:///C:/Documents%20and%20Settings/fred/Desktop/data.db
+**     <td> Windows only: Open the file "data.db" on fred's desktop on drive
+**          C:. Note that the %20 escaping in this example is not strictly 
+**          necessary - space characters can be used literally
+**          in URI filenames.
+** <tr><td> file:data.db?mode=ro&cache=private <td> 
+**          Open file "data.db" in the current directory for read-only access.
+**          Regardless of whether or not shared-cache mode is enabled by
+**          default, use a private cache.
+** <tr><td> file:/home/fred/data.db?vfs=unix-nolock <td>
+**          Open file "/home/fred/data.db". Use the special VFS "unix-nolock".
+** <tr><td> file:data.db?mode=readonly <td> 
+**          An error. "readonly" is not a valid option for the "mode" parameter.
+** </table>
+**
+** ^URI hexadecimal escape sequences (%HH) are supported within the path and
+** query components of a URI. A hexadecimal escape sequence consists of a
+** percent sign - "%" - followed by exactly two hexadecimal digits 
+** specifying an octet value. ^Before the path or query components of a
+** URI filename are interpreted, they are encoded using UTF-8 and all 
+** hexadecimal escape sequences replaced by a single byte containing the
+** corresponding octet. If this process generates an invalid UTF-8 encoding,
+** the results are undefined.
 **
 ** <b>Note to Windows users:</b>  The encoding used for the filename argument
 ** of sqlite3_open() and sqlite3_open_v2() must be UTF-8, not whatever
@@ -2424,6 +2560,26 @@ SQLITE_API int sqlite3_open_v2(
   const char *zVfs        /* Name of VFS module to use */
 );
 
+/*
+** CAPI3REF: Obtain Values For URI Parameters
+**
+** This is a utility routine, useful to VFS implementations, that checks
+** to see if a database file was a URI that contained a specific query 
+** parameter, and if so obtains the value of the query parameter.
+**
+** The zFilename argument is the filename pointer passed into the xOpen()
+** method of a VFS implementation.  The zParam argument is the name of the
+** query parameter we seek.  This routine returns the value of the zParam
+** parameter if it exists.  If the parameter does not exist, this routine
+** returns a NULL pointer.
+**
+** If the zFilename argument to this function is not a pointer that SQLite
+** passed into the xOpen VFS method, then the behavior of this routine
+** is undefined and probably undesirable.
+*/
+SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);
+
+
 /*
 ** CAPI3REF: Error Codes And Messages
 **
@@ -2539,43 +2695,45 @@ SQLITE_API int sqlite3_limit(sqlite3*, int id, int newVal);
 ** Additional information is available at [limits | Limits in SQLite].
 **
 ** <dl>
-** ^(<dt>SQLITE_LIMIT_LENGTH</dt>
+** [[SQLITE_LIMIT_LENGTH]] ^(<dt>SQLITE_LIMIT_LENGTH</dt>
 ** <dd>The maximum size of any string or BLOB or table row, in bytes.<dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
+** [[SQLITE_LIMIT_SQL_LENGTH]] ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
 ** <dd>The maximum length of an SQL statement, in bytes.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_COLUMN</dt>
+** [[SQLITE_LIMIT_COLUMN]] ^(<dt>SQLITE_LIMIT_COLUMN</dt>
 ** <dd>The maximum number of columns in a table definition or in the
 ** result set of a [SELECT] or the maximum number of columns in an index
 ** or in an ORDER BY or GROUP BY clause.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
+** [[SQLITE_LIMIT_EXPR_DEPTH]] ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
 ** <dd>The maximum depth of the parse tree on any expression.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
+** [[SQLITE_LIMIT_COMPOUND_SELECT]] ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
 ** <dd>The maximum number of terms in a compound SELECT statement.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
+** [[SQLITE_LIMIT_VDBE_OP]] ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
 ** <dd>The maximum number of instructions in a virtual machine program
 ** used to implement an SQL statement.  This limit is not currently
 ** enforced, though that might be added in some future release of
 ** SQLite.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
+** [[SQLITE_LIMIT_FUNCTION_ARG]] ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
 ** <dd>The maximum number of arguments on a function.</dd>)^
 **
-** ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
+** [[SQLITE_LIMIT_ATTACHED]] ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
 ** <dd>The maximum number of [ATTACH | attached databases].)^</dd>
 **
+** [[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]]
 ** ^(<dt>SQLITE_LIMIT_LIKE_PATTERN_LENGTH</dt>
 ** <dd>The maximum length of the pattern argument to the [LIKE] or
 ** [GLOB] operators.</dd>)^
 **
+** [[SQLITE_LIMIT_VARIABLE_NUMBER]]
 ** ^(<dt>SQLITE_LIMIT_VARIABLE_NUMBER</dt>
 ** <dd>The maximum index number of any [parameter] in an SQL statement.)^
 **
-** ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
+** [[SQLITE_LIMIT_TRIGGER_DEPTH]] ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
 ** <dd>The maximum depth of recursion for triggers.</dd>)^
 ** </dl>
 */
@@ -3104,7 +3262,7 @@ SQLITE_API const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
 ** ^[SQLITE_BUSY] means that the database engine was unable to acquire the
 ** database locks it needs to do its job.  ^If the statement is a [COMMIT]
 ** or occurs outside of an explicit transaction, then you can retry the
-** statement.  If the statement is not a [COMMIT] and occurs within a
+** statement.  If the statement is not a [COMMIT] and occurs within an
 ** explicit transaction then you should rollback the transaction before
 ** continuing.
 **
@@ -3383,7 +3541,7 @@ SQLITE_API sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);
 ** CAPI3REF: Destroy A Prepared Statement Object
 **
 ** ^The sqlite3_finalize() function is called to delete a [prepared statement].
-** ^If the most recent evaluation of the statement encountered no errors or
+** ^If the most recent evaluation of the statement encountered no errors
 ** or if the statement is never been evaluated, then sqlite3_finalize() returns
 ** SQLITE_OK.  ^If the most recent evaluation of statement S failed, then
 ** sqlite3_finalize(S) returns the appropriate [error code] or
@@ -4610,6 +4768,11 @@ struct sqlite3_module {
                        void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
                        void **ppArg);
   int (*xRename)(sqlite3_vtab *pVtab, const char *zNew);
+  /* The methods above are in version 1 of the sqlite_module object. Those 
+  ** below are for version 2 and greater. */
+  int (*xSavepoint)(sqlite3_vtab *pVTab, int);
+  int (*xRelease)(sqlite3_vtab *pVTab, int);
+  int (*xRollbackTo)(sqlite3_vtab *pVTab, int);
 };
 
 /*
@@ -5292,7 +5455,7 @@ struct sqlite3_mutex_methods {
 **
 ** ^If the argument to sqlite3_mutex_held() is a NULL pointer then
 ** the routine should return 1.   This seems counter-intuitive since
-** clearly the mutex cannot be held if it does not exist.  But the
+** clearly the mutex cannot be held if it does not exist.  But
 ** the reason the mutex does not exist is because the build is not
 ** using mutexes.  And we do not want the assert() containing the
 ** call to sqlite3_mutex_held() to fail, so a non-zero return is
@@ -5415,7 +5578,8 @@ SQLITE_API int sqlite3_test_control(int op, ...);
 #define SQLITE_TESTCTRL_ISKEYWORD               16
 #define SQLITE_TESTCTRL_PGHDRSZ                 17
 #define SQLITE_TESTCTRL_SCRATCHMALLOC           18
-#define SQLITE_TESTCTRL_LAST                    18
+#define SQLITE_TESTCTRL_LOCALTIME_FAULT         19
+#define SQLITE_TESTCTRL_LAST                    19
 
 /*
 ** CAPI3REF: SQLite Runtime Status
@@ -5424,7 +5588,7 @@ SQLITE_API int sqlite3_test_control(int op, ...);
 ** about the performance of SQLite, and optionally to reset various
 ** highwater marks.  ^The first argument is an integer code for
 ** the specific parameter to measure.  ^(Recognized integer codes
-** are of the form [SQLITE_STATUS_MEMORY_USED | SQLITE_STATUS_...].)^
+** are of the form [status parameters | SQLITE_STATUS_...].)^
 ** ^The current value of the parameter is returned into *pCurrent.
 ** ^The highest recorded value is returned in *pHighwater.  ^If the
 ** resetFlag is true, then the highest record value is reset after
@@ -5451,12 +5615,13 @@ SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetF
 
 /*
 ** CAPI3REF: Status Parameters
+** KEYWORDS: {status parameters}
 **
 ** These integer constants designate various run-time status parameters
 ** that can be returned by [sqlite3_status()].
 **
 ** <dl>
-** ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
+** [[SQLITE_STATUS_MEMORY_USED]] ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
 ** <dd>This parameter is the current amount of memory checked out
 ** using [sqlite3_malloc()], either directly or indirectly.  The
 ** figure includes calls made to [sqlite3_malloc()] by the application
@@ -5466,23 +5631,24 @@ SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetF
 ** this parameter.  The amount returned is the sum of the allocation
 ** sizes as reported by the xSize method in [sqlite3_mem_methods].</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
+** [[SQLITE_STATUS_MALLOC_SIZE]] ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
 ** <dd>This parameter records the largest memory allocation request
 ** handed to [sqlite3_malloc()] or [sqlite3_realloc()] (or their
 ** internal equivalents).  Only the value returned in the
 ** *pHighwater parameter to [sqlite3_status()] is of interest.  
 ** The value written into the *pCurrent parameter is undefined.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_MALLOC_COUNT</dt>
+** [[SQLITE_STATUS_MALLOC_COUNT]] ^(<dt>SQLITE_STATUS_MALLOC_COUNT</dt>
 ** <dd>This parameter records the number of separate memory allocations
 ** currently checked out.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
+** [[SQLITE_STATUS_PAGECACHE_USED]] ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
 ** <dd>This parameter returns the number of pages used out of the
 ** [pagecache memory allocator] that was configured using 
 ** [SQLITE_CONFIG_PAGECACHE].  The
 ** value returned is in pages, not in bytes.</dd>)^
 **
+** [[SQLITE_STATUS_PAGECACHE_OVERFLOW]] 
 ** ^(<dt>SQLITE_STATUS_PAGECACHE_OVERFLOW</dt>
 ** <dd>This parameter returns the number of bytes of page cache
 ** allocation which could not be satisfied by the [SQLITE_CONFIG_PAGECACHE]
@@ -5492,13 +5658,13 @@ SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetF
 ** [SQLITE_CONFIG_PAGECACHE]) and allocations that overflowed because
 ** no space was left in the page cache.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
+** [[SQLITE_STATUS_PAGECACHE_SIZE]] ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
 ** <dd>This parameter records the largest memory allocation request
 ** handed to [pagecache memory allocator].  Only the value returned in the
 ** *pHighwater parameter to [sqlite3_status()] is of interest.  
 ** The value written into the *pCurrent parameter is undefined.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_SCRATCH_USED</dt>
+** [[SQLITE_STATUS_SCRATCH_USED]] ^(<dt>SQLITE_STATUS_SCRATCH_USED</dt>
 ** <dd>This parameter returns the number of allocations used out of the
 ** [scratch memory allocator] configured using
 ** [SQLITE_CONFIG_SCRATCH].  The value returned is in allocations, not
@@ -5506,7 +5672,7 @@ SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetF
 ** outstanding at time, this parameter also reports the number of threads
 ** using scratch memory at the same time.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
+** [[SQLITE_STATUS_SCRATCH_OVERFLOW]] ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
 ** <dd>This parameter returns the number of bytes of scratch memory
 ** allocation which could not be satisfied by the [SQLITE_CONFIG_SCRATCH]
 ** buffer and where forced to overflow to [sqlite3_malloc()].  The values
@@ -5516,13 +5682,13 @@ SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetF
 ** slots were available.
 ** </dd>)^
 **
-** ^(<dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
+** [[SQLITE_STATUS_SCRATCH_SIZE]] ^(<dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
 ** <dd>This parameter records the largest memory allocation request
 ** handed to [scratch memory allocator].  Only the value returned in the
 ** *pHighwater parameter to [sqlite3_status()] is of interest.  
 ** The value written into the *pCurrent parameter is undefined.</dd>)^
 **
-** ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
+** [[SQLITE_STATUS_PARSER_STACK]] ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
 ** <dd>This parameter records the deepest parser stack.  It is only
 ** meaningful if SQLite is compiled with [YYTRACKMAXSTACKDEPTH].</dd>)^
 ** </dl>
@@ -5547,9 +5713,9 @@ SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetF
 ** about a single [database connection].  ^The first argument is the
 ** database connection object to be interrogated.  ^The second argument
 ** is an integer constant, taken from the set of
-** [SQLITE_DBSTATUS_LOOKASIDE_USED | SQLITE_DBSTATUS_*] macros, that
+** [SQLITE_DBSTATUS options], that
 ** determines the parameter to interrogate.  The set of 
-** [SQLITE_DBSTATUS_LOOKASIDE_USED | SQLITE_DBSTATUS_*] macros is likely
+** [SQLITE_DBSTATUS options] is likely
 ** to grow in future releases of SQLite.
 **
 ** ^The current value of the requested parameter is written into *pCur
@@ -5566,6 +5732,7 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 
 /*
 ** CAPI3REF: Status Parameters for database connections
+** KEYWORDS: {SQLITE_DBSTATUS options}
 **
 ** These constants are the available integer "verbs" that can be passed as
 ** the second argument to the [sqlite3_db_status()] interface.
@@ -5577,15 +5744,16 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 ** if a discontinued or unsupported verb is invoked.
 **
 ** <dl>
-** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
+** [[SQLITE_DBSTATUS_LOOKASIDE_USED]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
 ** <dd>This parameter returns the number of lookaside memory slots currently
 ** checked out.</dd>)^
 **
-** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_HIT</dt>
+** [[SQLITE_DBSTATUS_LOOKASIDE_HIT]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_HIT</dt>
 ** <dd>This parameter returns the number malloc attempts that were 
 ** satisfied using lookaside memory. Only the high-water value is meaningful;
 ** the current value is always zero.)^
 **
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE]]
 ** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE</dt>
 ** <dd>This parameter returns the number malloc attempts that might have
 ** been satisfied using lookaside memory but failed due to the amount of
@@ -5593,6 +5761,7 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 ** Only the high-water value is meaningful;
 ** the current value is always zero.)^
 **
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL]]
 ** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL</dt>
 ** <dd>This parameter returns the number malloc attempts that might have
 ** been satisfied using lookaside memory but failed due to all lookaside
@@ -5600,12 +5769,12 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 ** Only the high-water value is meaningful;
 ** the current value is always zero.)^
 **
-** ^(<dt>SQLITE_DBSTATUS_CACHE_USED</dt>
+** [[SQLITE_DBSTATUS_CACHE_USED]] ^(<dt>SQLITE_DBSTATUS_CACHE_USED</dt>
 ** <dd>This parameter returns the approximate number of of bytes of heap
 ** memory used by all pager caches associated with the database connection.)^
 ** ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_USED is always 0.
 **
-** ^(<dt>SQLITE_DBSTATUS_SCHEMA_USED</dt>
+** [[SQLITE_DBSTATUS_SCHEMA_USED]] ^(<dt>SQLITE_DBSTATUS_SCHEMA_USED</dt>
 ** <dd>This parameter returns the approximate number of of bytes of heap
 ** memory used to store the schema for all databases associated
 ** with the connection - main, temp, and any [ATTACH]-ed databases.)^ 
@@ -5614,7 +5783,7 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 ** [shared cache mode] being enabled.
 ** ^The highwater mark associated with SQLITE_DBSTATUS_SCHEMA_USED is always 0.
 **
-** ^(<dt>SQLITE_DBSTATUS_STMT_USED</dt>
+** [[SQLITE_DBSTATUS_STMT_USED]] ^(<dt>SQLITE_DBSTATUS_STMT_USED</dt>
 ** <dd>This parameter returns the approximate number of of bytes of heap
 ** and lookaside memory used by all prepared statements associated with
 ** the database connection.)^
@@ -5636,7 +5805,7 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 ** CAPI3REF: Prepared Statement Status
 **
 ** ^(Each prepared statement maintains various
-** [SQLITE_STMTSTATUS_SORT | counters] that measure the number
+** [SQLITE_STMTSTATUS counters] that measure the number
 ** of times it has performed specific operations.)^  These counters can
 ** be used to monitor the performance characteristics of the prepared
 ** statements.  For example, if the number of table steps greatly exceeds
@@ -5647,7 +5816,7 @@ SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int r
 ** ^(This interface is used to retrieve and reset counter values from
 ** a [prepared statement].  The first argument is the prepared statement
 ** object to be interrogated.  The second argument
-** is an integer code for a specific [SQLITE_STMTSTATUS_SORT | counter]
+** is an integer code for a specific [SQLITE_STMTSTATUS counter]
 ** to be interrogated.)^
 ** ^The current value of the requested counter is returned.
 ** ^If the resetFlg is true, then the counter is reset to zero after this
@@ -5659,24 +5828,25 @@ SQLITE_API int sqlite3_stmt_status(sqlite3_stmt*, int op,int resetFlg);
 
 /*
 ** CAPI3REF: Status Parameters for prepared statements
+** KEYWORDS: {SQLITE_STMTSTATUS counter} {SQLITE_STMTSTATUS counters}
 **
 ** These preprocessor macros define integer codes that name counter
 ** values associated with the [sqlite3_stmt_status()] interface.
 ** The meanings of the various counters are as follows:
 **
 ** <dl>
-** <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
+** [[SQLITE_STMTSTATUS_FULLSCAN_STEP]] <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
 ** <dd>^This is the number of times that SQLite has stepped forward in
 ** a table as part of a full table scan.  Large numbers for this counter
 ** may indicate opportunities for performance improvement through 
 ** careful use of indices.</dd>
 **
-** <dt>SQLITE_STMTSTATUS_SORT</dt>
+** [[SQLITE_STMTSTATUS_SORT]] <dt>SQLITE_STMTSTATUS_SORT</dt>
 ** <dd>^This is the number of sort operations that have occurred.
 ** A non-zero value in this counter may indicate an opportunity to
 ** improvement performance through careful use of indices.</dd>
 **
-** <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
+** [[SQLITE_STMTSTATUS_AUTOINDEX]] <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
 ** <dd>^This is the number of rows inserted into transient indices that
 ** were created automatically in order to help joins run faster.
 ** A non-zero value in this counter may indicate an opportunity to
@@ -5727,6 +5897,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** the application may discard the parameter after the call to
 ** [sqlite3_config()] returns.)^
 **
+** [[the xInit() page cache method]]
 ** ^(The xInit() method is called once for each effective 
 ** call to [sqlite3_initialize()])^
 ** (usually only once during the lifetime of the process). ^(The xInit()
@@ -5737,6 +5908,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** built-in default page cache is used instead of the application defined
 ** page cache.)^
 **
+** [[the xShutdown() page cache method]]
 ** ^The xShutdown() method is called by [sqlite3_shutdown()].
 ** It can be used to clean up 
 ** any outstanding resources before process shutdown, if required.
@@ -5751,6 +5923,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** ^SQLite will never invoke xInit() more than once without an intervening
 ** call to xShutdown().
 **
+** [[the xCreate() page cache methods]]
 ** ^SQLite invokes the xCreate() method to construct a new cache instance.
 ** SQLite will typically create one cache instance for each open database file,
 ** though this is not guaranteed. ^The
@@ -5775,6 +5948,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** ^Hence, a cache created with bPurgeable false will
 ** never contain any unpinned pages.
 **
+** [[the xCachesize() page cache method]]
 ** ^(The xCachesize() method may be called at any time by SQLite to set the
 ** suggested maximum cache-size (number of pages stored by) the cache
 ** instance passed as the first argument. This is the value configured using
@@ -5782,14 +5956,16 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** parameter, the implementation is not required to do anything with this
 ** value; it is advisory only.
 **
+** [[the xPagecount() page cache methods]]
 ** The xPagecount() method must return the number of pages currently
 ** stored in the cache, both pinned and unpinned.
 ** 
+** [[the xFetch() page cache methods]]
 ** The xFetch() method locates a page in the cache and returns a pointer to 
 ** the page, or a NULL pointer.
 ** A "page", in this context, means a buffer of szPage bytes aligned at an
 ** 8-byte boundary. The page to be fetched is determined by the key. ^The
-** mimimum key value is 1.  After it has been retrieved using xFetch, the page 
+** minimum key value is 1.  After it has been retrieved using xFetch, the page 
 ** is considered to be "pinned".
 **
 ** If the requested page is already in the page cache, then the page cache
@@ -5813,6 +5989,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** attempt to unpin one or more cache pages by spilling the content of
 ** pinned pages to disk and synching the operating system disk cache.
 **
+** [[the xUnpin() page cache method]]
 ** ^xUnpin() is called by SQLite with a pointer to a currently pinned page
 ** as its second argument.  If the third parameter, discard, is non-zero,
 ** then the page must be evicted from the cache.
@@ -5825,6 +6002,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** call to xUnpin() unpins the page regardless of the number of prior calls 
 ** to xFetch().
 **
+** [[the xRekey() page cache methods]]
 ** The xRekey() method is used to change the key value associated with the
 ** page passed as the second argument. If the cache
 ** previously contains an entry associated with newKey, it must be
@@ -5837,6 +6015,7 @@ typedef struct sqlite3_pcache sqlite3_pcache;
 ** of these pages are pinned, they are implicitly unpinned, meaning that
 ** they can be safely discarded.
 **
+** [[the xDestroy() page cache method]]
 ** ^The xDestroy() method is used to delete a cache allocated by xCreate().
 ** All resources associated with the specified cache should be freed. ^After
 ** calling the xDestroy() method, SQLite considers the [sqlite3_pcache*]
@@ -5899,7 +6078,7 @@ typedef struct sqlite3_backup sqlite3_backup;
 ** There should be exactly one call to sqlite3_backup_finish() for each
 ** successful call to sqlite3_backup_init().
 **
-** <b>sqlite3_backup_init()</b>
+** [[sqlite3_backup_init()]] <b>sqlite3_backup_init()</b>
 **
 ** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the 
 ** [database connection] associated with the destination database 
@@ -5926,7 +6105,7 @@ typedef struct sqlite3_backup sqlite3_backup;
 ** sqlite3_backup_finish() functions to perform the specified backup 
 ** operation.
 **
-** <b>sqlite3_backup_step()</b>
+** [[sqlite3_backup_step()]] <b>sqlite3_backup_step()</b>
 **
 ** ^Function sqlite3_backup_step(B,N) will copy up to N pages between 
 ** the source and destination databases specified by [sqlite3_backup] object B.
@@ -5983,7 +6162,7 @@ typedef struct sqlite3_backup sqlite3_backup;
 ** by the backup operation, then the backup database is automatically
 ** updated at the same time.
 **
-** <b>sqlite3_backup_finish()</b>
+** [[sqlite3_backup_finish()]] <b>sqlite3_backup_finish()</b>
 **
 ** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the 
 ** application wishes to abandon the backup operation, the application
@@ -6006,7 +6185,8 @@ typedef struct sqlite3_backup sqlite3_backup;
 ** is not a permanent error and does not affect the return value of
 ** sqlite3_backup_finish().
 **
-** <b>sqlite3_backup_remaining(), sqlite3_backup_pagecount()</b>
+** [[sqlite3_backup__remaining()]] [[sqlite3_backup_pagecount()]]
+** <b>sqlite3_backup_remaining() and sqlite3_backup_pagecount()</b>
 **
 ** ^Each call to sqlite3_backup_step() sets two values inside
 ** the [sqlite3_backup] object: the number of pages still to be backed
@@ -6392,6 +6572,93 @@ SQLITE_API int sqlite3_wal_checkpoint_v2(
 #define SQLITE_CHECKPOINT_FULL    1
 #define SQLITE_CHECKPOINT_RESTART 2
 
+/*
+** CAPI3REF: Virtual Table Interface Configuration
+**
+** This function may be called by either the [xConnect] or [xCreate] method
+** of a [virtual table] implementation to configure
+** various facets of the virtual table interface.
+**
+** If this interface is invoked outside the context of an xConnect or
+** xCreate virtual table method then the behavior is undefined.
+**
+** At present, there is only one option that may be configured using
+** this function. (See [SQLITE_VTAB_CONSTRAINT_SUPPORT].)  Further options
+** may be added in the future.
+*/
+SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);
+
+/*
+** CAPI3REF: Virtual Table Configuration Options
+**
+** These macros define the various options to the
+** [sqlite3_vtab_config()] interface that [virtual table] implementations
+** can use to customize and optimize their behavior.
+**
+** <dl>
+** <dt>SQLITE_VTAB_CONSTRAINT_SUPPORT
+** <dd>Calls of the form
+** [sqlite3_vtab_config](db,SQLITE_VTAB_CONSTRAINT_SUPPORT,X) are supported,
+** where X is an integer.  If X is zero, then the [virtual table] whose
+** [xCreate] or [xConnect] method invoked [sqlite3_vtab_config()] does not
+** support constraints.  In this configuration (which is the default) if
+** a call to the [xUpdate] method returns [SQLITE_CONSTRAINT], then the entire
+** statement is rolled back as if [ON CONFLICT | OR ABORT] had been
+** specified as part of the users SQL statement, regardless of the actual
+** ON CONFLICT mode specified.
+**
+** If X is non-zero, then the virtual table implementation guarantees
+** that if [xUpdate] returns [SQLITE_CONSTRAINT], it will do so before
+** any modifications to internal or persistent data structures have been made.
+** If the [ON CONFLICT] mode is ABORT, FAIL, IGNORE or ROLLBACK, SQLite 
+** is able to roll back a statement or database transaction, and abandon
+** or continue processing the current SQL statement as appropriate. 
+** If the ON CONFLICT mode is REPLACE and the [xUpdate] method returns
+** [SQLITE_CONSTRAINT], SQLite handles this as if the ON CONFLICT mode
+** had been ABORT.
+**
+** Virtual table implementations that are required to handle OR REPLACE
+** must do so within the [xUpdate] method. If a call to the 
+** [sqlite3_vtab_on_conflict()] function indicates that the current ON 
+** CONFLICT policy is REPLACE, the virtual table implementation should 
+** silently replace the appropriate rows within the xUpdate callback and
+** return SQLITE_OK. Or, if this is not possible, it may return
+** SQLITE_CONSTRAINT, in which case SQLite falls back to OR ABORT 
+** constraint handling.
+** </dl>
+*/
+#define SQLITE_VTAB_CONSTRAINT_SUPPORT 1
+
+/*
+** CAPI3REF: Determine The Virtual Table Conflict Policy
+**
+** This function may only be called from within a call to the [xUpdate] method
+** of a [virtual table] implementation for an INSERT or UPDATE operation. ^The
+** value returned is one of [SQLITE_ROLLBACK], [SQLITE_IGNORE], [SQLITE_FAIL],
+** [SQLITE_ABORT], or [SQLITE_REPLACE], according to the [ON CONFLICT] mode
+** of the SQL statement that triggered the call to the [xUpdate] method of the
+** [virtual table].
+*/
+SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);
+
+/*
+** CAPI3REF: Conflict resolution modes
+**
+** These constants are returned by [sqlite3_vtab_on_conflict()] to
+** inform a [virtual table] implementation what the [ON CONFLICT] mode
+** is for the SQL statement being evaluated.
+**
+** Note that the [SQLITE_IGNORE] constant is also used as a potential
+** return value from the [sqlite3_set_authorizer()] callback and that
+** [SQLITE_ABORT] is also a [result code].
+*/
+#define SQLITE_ROLLBACK 1
+/* #define SQLITE_IGNORE 2 // Also used by sqlite3_authorizer() callback */
+#define SQLITE_FAIL     3
+/* #define SQLITE_ABORT 4  // Also an error code */
+#define SQLITE_REPLACE  5
+
+
 
 /*
 ** Undo the hack that converts floating point types to integer for

util/sectors2sqlite.py

@@ -0,0 +1,123 @@
+#!/usr/bin/python3
+
+# Loads block files from sectors folders into map.sqlite database.
+# The sectors folder should be safe to remove after this prints "Finished."
+
+import time, os
+
+try:
+	import sqlite3
+except:
+	exit('You need to have the Python sqlite3 module.')
+
+path = "../world/"
+
+paths = []
+
+# sectors2 gets to try first
+if os.path.isdir(path + 'sectors2/'):
+	paths.append('sectors2')
+if os.path.isdir(path + 'sectors/'):
+	paths.append('sectors')
+
+if not paths:
+	exit('Could not find sectors folder at ' + path + 'sectors2/ or ' + path + 'sectors/')
+
+def uint(u):
+	u = int('0x'+u, 16)
+	return (u if u < 2**11 else u - 2**12)
+
+def int64(u):
+	while u >= 2**63:
+		u -= 2**64
+	while u <= -2**63:
+		u += 2**64
+	return u
+
+# Convert sector folder(s) to integer
+def getSectorPos(dirname):
+	if len(dirname) == 8:
+		# Old layout
+		x = uint(dirname[:4])
+		z = uint(dirname[4:])
+	elif len(dirname) == 7:
+		# New layout
+		x = uint(dirname[:3])
+		z = uint(dirname[4:])
+	else:
+		print('Terrible sector at ' + dirname)
+		return
+	
+	return x, z
+
+# Convert block file to integer position
+def getBlockPos(sectordir, blockfile):
+	p2d = getSectorPos(sectordir)
+	
+	if not p2d:
+		return
+	
+	if len(blockfile) != 4:
+		print("Invalid block filename: " + blockfile)
+	
+	y = uint(blockfile)
+	
+	return p2d[0], y, p2d[1]
+
+# Convert location to integer
+def getBlockAsInteger(p):
+	return int64(p[2]*16777216 + p[1]*4096 + p[0])
+
+# Init
+
+create = False
+if not os.path.isfile(path + 'map.sqlite'):
+	create = True
+
+conn = sqlite3.connect(path + 'map.sqlite')
+
+if not conn:
+	exit('Could not open database.')
+
+cur = conn.cursor()
+
+if create:
+	cur.execute("CREATE TABLE IF NOT EXISTS `blocks` (`pos` INT NOT NULL PRIMARY KEY, `data` BLOB);")
+	conn.commit()
+	print('Created database at ' + path + 'map.sqlite')
+
+# Crawl the folders
+
+count = 0
+t = time.time()
+for base in paths:
+	v = 0
+	if base == 'sectors':
+		v = 1
+	elif base == 'sectors2':
+		v= 2
+	else:
+		print('Ignoring base ' + base)
+		continue
+	
+	for root, dirs, files in os.walk(path + base):
+		if files:
+			for block in files:
+				pos = getBlockAsInteger(getBlockPos(root[(-8 if v == 1 else -7 if v == 2 else 0):], block))
+				
+				if pos is None:
+					print('Ignoring broken path ' + root + '/' + block)
+					continue
+				
+				f = open(root+'/'+block, 'rb')
+				cur.execute('INSERT OR IGNORE INTO `blocks` VALUES(?, ?)', (pos, f.read()))
+				f.close()
+				count += 1
+		
+		if(time.time() - t > 3):
+			t = time.time()
+			print(str(count)+' blocks processed...')
+
+conn.commit()
+
+print('Finished. (' + str(count) + ' blocks)')