int nuodb_resultset_column_names(struct nuodb *db, struct nuodb_resultset *rs,
struct nuodb_value names[]) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(rs);
try {
ResultSetMetaData *resultSetMetaData = resultSet->getMetaData();
int columnCount = resultSetMetaData->getColumnCount();
for (int i=0; i < columnCount; ++i) {
int columnIndex = i+1;
const char *string = resultSetMetaData->getColumnLabel(columnIndex);
names[i].i64 = reinterpret_cast<int64_t>(string);
names[i].i32 = std::strlen(string);
}
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
int nuodb_resultset_next(struct nuodb *db, struct nuodb_resultset *rs,
int *has_values, struct nuodb_value values[]) {
ResultSet *resultSet = reinterpret_cast<ResultSet *>(rs);
try {
*has_values = resultSet->next();
if (*has_values) {
ResultSetMetaData *resultSetMetaData = resultSet->getMetaData();
int columnCount = resultSetMetaData->getColumnCount();
for (int i=0; i < columnCount; ++i) {
int64_t i64 = 0;
int32_t i32 = 0;
enum nuodb_value_type vt = NUODB_TYPE_NULL;
int columnIndex = i+1;
switch (resultSetMetaData->getColumnType(columnIndex)) {
case NUOSQL_NULL:
vt = NUODB_TYPE_NULL;
break;
case NUOSQL_TINYINT:
case NUOSQL_SMALLINT:
case NUOSQL_INTEGER:
case NUOSQL_BIGINT:
if (resultSetMetaData->getScale(columnIndex) == 0) {
i64 = resultSet->getLong(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_INT64;
}
break;
}
// fallthrough; must be fetched as a string
case NUOSQL_NUMERIC:
case NUOSQL_DECIMAL: {
const char *string = resultSet->getString(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_BYTES; // strings are returned as bytes
i64 = reinterpret_cast<int64_t>(string);
i32 = std::strlen(string);
}
break;
}
case NUOSQL_FLOAT:
case NUOSQL_DOUBLE: {
union {
double float64;
int64_t i64;
} value = { resultSet->getDouble(columnIndex) };
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_FLOAT64;
i64 = value.i64;
}
break;
}
case NUOSQL_BIT:
case NUOSQL_BOOLEAN:
i64 = resultSet->getBoolean(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_BOOL;
}
break;
case NUOSQL_DATE:
case NUOSQL_TIME:
case NUOSQL_TIMESTAMP: {
Timestamp *ts = resultSet->getTimestamp(columnIndex);
if (ts && !resultSet->wasNull()) {
vt = NUODB_TYPE_TIME;
i64 = ts->getSeconds();
i32 = ts->getNanos();
}
break;
}
default: {
const Bytes b = resultSet->getBytes(columnIndex);
if (!resultSet->wasNull()) {
vt = NUODB_TYPE_BYTES;
i64 = reinterpret_cast<int64_t>(b.data);
i32 = b.length;
}
break;
}
}
values[i].i64 = i64;
values[i].i32 = i32;
values[i].vt = vt;
}
}
return 0;
} catch (SQLException &e) {
return setError(db, e);
}
}
/**
*
* Executes a query and returns the result
*
* @param VariantVector arguments The query arguments. The first argument should
* be the query and any subsequent arguments are the bind parameters
*
* @return The results from the query
*/
QueryResult DatabaseConnection::execute(VariantVector arguments)
{
int i;
int count;
QueryResult result;
ResultSet *sqlResult;
ResultSetMetaData *sqlMetadata;
result = connect();
if (result.error.isError) {
// There was an error connecting. Return the result.
return result;
}
PreparedStatement *sqlStatement = nullptr;
try {
// Prepare query
sqlStatement = connection->prepareStatement(
arguments.front().toString());
if (arguments.size() > 1) {
// Bind arguments
int i = 1;
for (auto it = arguments.begin() + 1; it != arguments.end(); ++it) {
sqlStatement->setString(i, it->toString());
i++;
}
}
// Execute query
sqlStatement->execute();
// Fetch results
sqlResult = sqlStatement->getResultSet();
} catch (SQLException &e) {
if (sqlStatement != nullptr) {
// Free memory
delete sqlStatement;
}
result.error.isError = true;
result.error.code = e.getErrorCode();
result.error.string = e.getSQLState() + ": " + e.what();
return result;
}
sqlMetadata = sqlResult->getMetaData();
count = sqlMetadata->getColumnCount();
for (i = 1; i <= count; i++) {
// Add to collection
result.columns.push_back(sqlMetadata->getColumnName(i).asStdString());
}
// Read rows
while (sqlResult->next()) {
VariantVector row;
for (i = 1; i <= count; i++) {
Variant column;
switch (sqlMetadata->getColumnType(i)) {
default:
case ::DataType::UNKNOWN:
case ::DataType::CHAR:
case ::DataType::VARCHAR:
case ::DataType::LONGVARCHAR:
case ::DataType::BINARY:
case ::DataType::VARBINARY:
case ::DataType::LONGVARBINARY:
case ::DataType::TIMESTAMP:
case ::DataType::DATE:
case ::DataType::GEOMETRY:
case ::DataType::ENUM:
case ::DataType::SET:
case ::DataType::BIGINT:
case ::DataType::REAL:
case ::DataType::DOUBLE:
case ::DataType::DECIMAL:
// @TODO: store binary, timestamp, date, & geometry differently
// Also numeric types (need to be added to Variant class)
column = sqlResult->getString(i).asStdString();
break;
case ::DataType::SQLNULL:
column = Variant();
break;
case ::DataType::BIT:
case ::DataType::TINYINT:
case ::DataType::SMALLINT:
case ::DataType::MEDIUMINT:
case ::DataType::INTEGER:
case ::DataType::NUMERIC:
column = sqlResult->getInt(i);
break;
case ::DataType::YEAR:
column = static_cast<unsigned short>(sqlResult->getUInt(i));
break;
}
// Add column to collection
row.push_back(column);
}
// Add row to collection
result.rows.push_back(row);
}
// Free memory
delete sqlResult;
delete sqlStatement;
return result;
}