SqlDialect get(DataSource dataSource) {
Connection connection = null;
try {
connection = dataSource.getConnection();
DatabaseMetaData metaData = connection.getMetaData();
String productName = metaData.getDatabaseProductName();
String productVersion = metaData.getDatabaseProductVersion();
List key = Arrays.asList(productName, productVersion);
SqlDialect dialect = map.get(key);
if (dialect == null) {
final SqlDialect.DatabaseProduct product =
SqlDialect.getProduct(productName, productVersion);
dialect = new SqlDialect(product, productName, metaData.getIdentifierQuoteString());
map.put(key, dialect);
}
connection.close();
connection = null;
return dialect;
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
// ignore
}
}
}
}
