/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.loader.custom;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.type.Type;

Simplified access to JDBC ResultSetMetaData
Author:Steve Ebersole
/** * Simplified access to JDBC ResultSetMetaData * * @author Steve Ebersole */
class JdbcResultMetadata { private final SessionFactoryImplementor factory; private final ResultSet resultSet; private final ResultSetMetaData resultSetMetaData; public JdbcResultMetadata(SessionFactoryImplementor factory, ResultSet resultSet) throws HibernateException { try { this.factory = factory; this.resultSet = resultSet; this.resultSetMetaData = resultSet.getMetaData(); } catch( SQLException e ) { throw new HibernateException( "Could not extract result set metadata", e ); } } public int getColumnCount() throws HibernateException { try { return resultSetMetaData.getColumnCount(); } catch( SQLException e ) { throw new HibernateException( "Could not determine result set column count", e ); } } public int resolveColumnPosition(String columnName) throws HibernateException { try { return resultSet.findColumn( columnName ); } catch( SQLException e ) { throw new HibernateException( "Could not resolve column name in result set [" + columnName + "]", e ); } } public String getColumnName(int position) throws HibernateException { try { return factory.getDialect().getColumnAliasExtractor().extractColumnAlias( resultSetMetaData, position ); } catch( SQLException e ) { throw new HibernateException( "Could not resolve column name [" + position + "]", e ); } } public Type getHibernateType(int columnPos) throws SQLException { int columnType = resultSetMetaData.getColumnType( columnPos ); int scale = resultSetMetaData.getScale( columnPos ); int precision = resultSetMetaData.getPrecision( columnPos ); int length = precision; if ( columnType == Types.CHAR && precision == 0 ) { length = resultSetMetaData.getColumnDisplaySize( columnPos ); } return factory.getTypeResolver().heuristicType( factory.getDialect().getHibernateTypeName( columnType, length, precision, scale ) ); } }