minetestmapper/db-sqlite3.cpp

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#include "db-sqlite3.h"
#include <stdexcept>
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#include <unistd.h> // for usleep
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#define SQLRES(f, good) \
result = (sqlite3_##f);\
if (result != good) {\
throw std::runtime_error(sqlite3_errmsg(db));\
}
#define SQLOK(f) SQLRES(f, SQLITE_OK)
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DBSQLite3::DBSQLite3(const std::string &mapdir) {
int result;
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std::string db_name = mapdir + "map.sqlite";
SQLOK(open_v2(db_name.c_str(), &db, SQLITE_OPEN_READONLY | SQLITE_OPEN_PRIVATECACHE, 0))
SQLOK(prepare_v2(db,
"SELECT pos, data FROM blocks WHERE (pos >= ? AND pos <= ?)",
-1, &stmt_get_blocks, NULL))
SQLOK(prepare_v2(db,
"SELECT pos FROM blocks",
-1, &stmt_get_block_pos, NULL))
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}
DBSQLite3::~DBSQLite3() {
int result;
SQLOK(finalize(stmt_get_blocks));
SQLOK(finalize(stmt_get_block_pos));
SQLOK(close(db));
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}
std::vector<int64_t> DBSQLite3::getBlockPos() {
std::vector<int64_t> vec;
int result;
while ((result = sqlite3_step(stmt_get_block_pos)) != SQLITE_DONE) {
if (result == SQLITE_ROW) {
int64_t blockpos = sqlite3_column_int64(stmt_get_block_pos, 0);
vec.push_back(blockpos);
} else if (result == SQLITE_BUSY) { // Wait some time and try again
usleep(10000);
} else {
throw std::runtime_error(sqlite3_errmsg(db));
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}
}
SQLOK(reset(stmt_get_block_pos));
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return vec;
}
DBBlockList DBSQLite3::getBlocksOnZ(int zPos)
{
DBBlockList blocks;
int64_t psMin = (static_cast<sqlite3_int64>(zPos) * 16777216L) - 0x800000;
int64_t psMax = (static_cast<sqlite3_int64>(zPos) * 16777216L) + 0x7fffff;
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sqlite3_bind_int64(stmt_get_blocks, 1, psMin);
sqlite3_bind_int64(stmt_get_blocks, 2, psMax);
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int result;
while ((result = sqlite3_step(stmt_get_blocks)) != SQLITE_DONE) {
if (result == SQLITE_ROW) {
int64_t blocknum = sqlite3_column_int64(stmt_get_blocks, 0);
const unsigned char *data = reinterpret_cast<const unsigned char *>(sqlite3_column_blob(stmt_get_blocks, 1));
int size = sqlite3_column_bytes(stmt_get_blocks, 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
usleep(10000);
} else {
throw std::runtime_error(sqlite3_errmsg(db));
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}
}
SQLOK(reset(stmt_get_blocks));
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return blocks;
}
#undef SQLRES
#undef SQLOK