int nuodb_statement_query(struct nuodb *db, struct nuodb_statement *st,
struct nuodb_resultset **rs, int *column_count) {
ResultSet *resultSet = 0;
PreparedStatement *stmt = reinterpret_cast<PreparedStatement *>(st);
try {
bool hasResults = stmt->execute();
if (hasResults) {
resultSet = stmt->getResultSet();
} else {
resultSet = stmt->getGeneratedKeys();
}
*column_count = resultSet->getMetaData()->getColumnCount();
*rs = reinterpret_cast<struct nuodb_resultset *>(resultSet);
return 0;
} catch (SQLException &e) {
if (resultSet) {
resultSet->close();
}
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;
}