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https://github.com/luanti-org/minetestmapper.git
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bcbfd00eba
Throwing exception from destructor is not recommended and generates lots of warnings during compilation. Don't use macro SQLRES, and: - ignore return code of sqlite3_finalize (of no interest here) - log to stderr sqlite3_close failure
93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
#include <stdexcept>
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#include <unistd.h> // for usleep
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#include <iostream>
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#include "db-sqlite3.h"
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#include "types.h"
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#define SQLRES(f, good) \
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result = (sqlite3_##f);\
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if (result != good) {\
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throw std::runtime_error(sqlite3_errmsg(db));\
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}
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#define SQLOK(f) SQLRES(f, SQLITE_OK)
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DBSQLite3::DBSQLite3(const std::string &mapdir)
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{
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int result;
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std::string db_name = mapdir + "map.sqlite";
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SQLOK(open_v2(db_name.c_str(), &db, SQLITE_OPEN_READONLY |
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SQLITE_OPEN_PRIVATECACHE, 0))
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SQLOK(prepare_v2(db,
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"SELECT pos, data FROM blocks WHERE pos BETWEEN ? AND ?",
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-1, &stmt_get_blocks_z, NULL))
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SQLOK(prepare_v2(db,
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"SELECT pos FROM blocks",
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-1, &stmt_get_block_pos, NULL))
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}
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DBSQLite3::~DBSQLite3()
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{
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sqlite3_finalize(stmt_get_blocks_z);
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sqlite3_finalize(stmt_get_block_pos);
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if (sqlite3_close(db) != SQLITE_OK) {
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std::cerr << "Error closing SQLite database." << std::endl;
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};
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}
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std::vector<BlockPos> DBSQLite3::getBlockPos()
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{
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int result;
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std::vector<BlockPos> positions;
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while ((result = sqlite3_step(stmt_get_block_pos)) != SQLITE_DONE) {
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if (result == SQLITE_ROW) {
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int64_t posHash = sqlite3_column_int64(stmt_get_block_pos, 0);
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positions.push_back(decodeBlockPos(posHash));
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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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throw std::runtime_error(sqlite3_errmsg(db));
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}
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}
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SQLOK(reset(stmt_get_block_pos));
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return positions;
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}
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void DBSQLite3::getBlocksOnZ(std::map<int16_t, BlockList> &blocks, int16_t zPos)
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{
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int result;
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// Magic numbers!
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int64_t minPos = encodeBlockPos(BlockPos(0, -2048, zPos));
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int64_t maxPos = encodeBlockPos(BlockPos(0, 2048, zPos)) - 1;
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SQLOK(bind_int64(stmt_get_blocks_z, 1, minPos));
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SQLOK(bind_int64(stmt_get_blocks_z, 2, maxPos));
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while ((result = sqlite3_step(stmt_get_blocks_z)) != SQLITE_DONE) {
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if (result == SQLITE_ROW) {
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int64_t posHash = sqlite3_column_int64(stmt_get_blocks_z, 0);
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const unsigned char *data = reinterpret_cast<const unsigned char *>(
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sqlite3_column_blob(stmt_get_blocks_z, 1));
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size_t size = sqlite3_column_bytes(stmt_get_blocks_z, 1);
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Block b(decodeBlockPos(posHash), ustring(data, size));
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blocks[b.first.x].push_back(b);
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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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throw std::runtime_error(sqlite3_errmsg(db));
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}
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}
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SQLOK(reset(stmt_get_blocks_z));
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}
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#undef SQLRES
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#undef SQLOK
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