mirror of
https://github.com/minetest/minetestmapper.git
synced 2024-11-21 23:13:53 +01:00
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
#include "db-sqlite3.h"
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#include <stdexcept>
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#include <unistd.h> // for usleep
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DBSQLite3::DBSQLite3(const std::string &mapdir) {
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std::string db_name = mapdir + "map.sqlite";
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if (sqlite3_open_v2(db_name.c_str(), &m_db, SQLITE_OPEN_READONLY | SQLITE_OPEN_PRIVATECACHE, 0) != SQLITE_OK) {
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throw std::runtime_error(std::string(sqlite3_errmsg(m_db)) + ", Database file: " + db_name);
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}
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}
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DBSQLite3::~DBSQLite3() {
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sqlite3_close_v2(m_db);
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}
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std::vector<int64_t> DBSQLite3::getBlockPos() {
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std::vector<int64_t> vec;
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sqlite3_stmt *statement;
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std::string sql = "SELECT pos FROM blocks";
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if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) == SQLITE_OK) {
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int result = 0;
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while (true) {
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result = sqlite3_step(statement);
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if(result == SQLITE_ROW) {
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sqlite3_int64 blocknum = sqlite3_column_int64(statement, 0);
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vec.push_back(blocknum);
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} else if (result == SQLITE_BUSY) // Wait some time and try again
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usleep(10000);
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else
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break;
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}
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} else {
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throw std::runtime_error("Failed to get list of MapBlocks");
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}
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return vec;
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}
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DBBlockList DBSQLite3::getBlocksOnZ(int zPos)
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{
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sqlite3_stmt *statement;
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std::string sql = "SELECT pos, data FROM blocks WHERE (pos >= ? AND pos <= ?)";
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if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) != SQLITE_OK) {
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throw std::runtime_error("Failed to prepare statement");
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}
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DBBlockList blocks;
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sqlite3_int64 psMin;
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sqlite3_int64 psMax;
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psMin = (static_cast<sqlite3_int64>(zPos) * 16777216l) - 0x800000;
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psMax = (static_cast<sqlite3_int64>(zPos) * 16777216l) + 0x7fffff;
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sqlite3_bind_int64(statement, 1, psMin);
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sqlite3_bind_int64(statement, 2, psMax);
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int result = 0;
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while (true) {
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result = sqlite3_step(statement);
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if(result == SQLITE_ROW) {
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sqlite3_int64 blocknum = sqlite3_column_int64(statement, 0);
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const unsigned char *data = reinterpret_cast<const unsigned char *>(sqlite3_column_blob(statement, 1));
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int size = sqlite3_column_bytes(statement, 1);
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blocks.push_back(DBBlock(blocknum, std::basic_string<unsigned char>(data, size)));
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} else if (result == SQLITE_BUSY) { // Wait some time and try again
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usleep(10000);
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} else {
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break;
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}
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}
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sqlite3_reset(statement);
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return blocks;
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}
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