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LevelDB support

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Sfan5
2014-03-05 21:41:27 +01:00
parent 15444ff8f6
commit 393d7e2ac0
13 changed files with 310 additions and 98 deletions
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71
db-sqlite3.cpp Normal file
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#include "db-sqlite3.h"
#include <stdexcept>
DBSQLite3::DBSQLite3(const std::string &mapdir) {
std::string db_name = mapdir + "map.sqlite";
if (sqlite3_open_v2(db_name.c_str(), &m_db, SQLITE_OPEN_READONLY | SQLITE_OPEN_PRIVATECACHE, 0) != SQLITE_OK) {
throw std::runtime_error(std::string(sqlite3_errmsg(m_db)) + ", Database file: " + db_name);
}
}
DBSQLite3::~DBSQLite3() {
sqlite3_close_v2(m_db);
}
std::vector<int64_t> DBSQLite3::getBlockPos() {
std::vector<int64_t> vec;
sqlite3_stmt *statement;
std::string sql = "SELECT pos FROM blocks";
if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) == SQLITE_OK) {
int result = 0;
while (true) {
result = sqlite3_step(statement);
if(result == SQLITE_ROW) {
sqlite3_int64 blocknum = sqlite3_column_int64(statement, 0);
vec.push_back(blocknum);
}
else
break;
}
} else {
throw std::runtime_error("Failed to get list of MapBlocks");
}
return vec;
}
DBBlockList DBSQLite3::getBlocksOnZ(int zPos)
{
sqlite3_stmt *statement;
std::string sql = "SELECT pos, data FROM blocks WHERE (pos >= ? AND pos <= ?)";
if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) != SQLITE_OK) {
throw std::runtime_error("Failed to prepare statement");
}
DBBlockList blocks;
sqlite3_int64 psMin;
sqlite3_int64 psMax;
psMin = (static_cast<sqlite3_int64>(zPos) * 16777216l) - 0x800000;
psMax = (static_cast<sqlite3_int64>(zPos) * 16777216l) + 0x7fffff;
sqlite3_bind_int64(statement, 1, psMin);
sqlite3_bind_int64(statement, 2, psMax);
int result = 0;
while (true) {
result = sqlite3_step(statement);
if(result == SQLITE_ROW) {
sqlite3_int64 blocknum = sqlite3_column_int64(statement, 0);
const unsigned char *data = reinterpret_cast<const unsigned char *>(sqlite3_column_blob(statement, 1));
int size = sqlite3_column_bytes(statement, 1);
blocks.push_back(DBBlock(blocknum, std::basic_string<unsigned char>(data, size)));
}
else {
break;
}
}
sqlite3_reset(statement);
return blocks;
}