resultsetwrapper.java

一个Java持久层类库

// $Id: ResultSetWrapper.java 5685 2005-02-12 07:19:50Z steveebersole $
package org.hibernate.jdbc;

import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.net.URL;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Date;
import java.sql.Ref;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Map;

/**
 * A ResultSet delegate, responsible for locally caching the columnName-to-columnIndex
 * resolution that has been found to be inefficient in a few vendor's drivers (i.e., Oracle
 * and Postgres).
 *
 * @author Steve Ebersole
 */
public class ResultSetWrapper implements ResultSet {

	private ResultSet rs;
	private ColumnNameCache columnNameCache;

	public ResultSetWrapper(ResultSet resultSet, ColumnNameCache columnNameCache) {
		this.rs = resultSet;
		this.columnNameCache = columnNameCache;
	}

	/*package*/ ResultSet getTarget() {
		return rs;
	}


	// ResultSet impl ("overridden") ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	/**
	 * Overridden version to utilize local caching of the column indexes by name
	 * to improve performance for those drivers which are known to not support
	 * such caching by themselves.
	 * <p/>
	 * This implementation performs the caching based on the upper case version
	 * of the given column name.
	 *
	 * @param columnName The column name to resolve into an index.
	 * @return The column index corresponding to the given column name.
	 * @throws SQLException - if the ResultSet object does not contain
	 * columnName or a database access error occurs
	 */
	public int findColumn(String columnName) throws SQLException {
		return columnNameCache.getIndexForColumnName( columnName, this );
	}

	public Array getArray(String colName) throws SQLException {
		return rs.getArray( findColumn(colName) );
	}

	public void updateArray(String columnName, Array x) throws SQLException {
		rs.updateArray( findColumn(columnName), x );
	}

	public InputStream getAsciiStream(String columnName) throws SQLException {
		return rs.getAsciiStream( findColumn(columnName) );
	}

	public void updateAsciiStream(String columnName, InputStream x, int length) throws SQLException {
		rs.updateAsciiStream( findColumn(columnName), x, length );
	}

	public BigDecimal getBigDecimal(String columnName) throws SQLException {
		return rs.getBigDecimal( findColumn(columnName) );
	}

	public BigDecimal getBigDecimal(String columnName, int scale) throws SQLException {
		return rs.getBigDecimal( findColumn(columnName), scale );
	}

	public void updateBigDecimal(String columnName, BigDecimal x) throws SQLException {
		rs.updateBigDecimal( findColumn(columnName), x );
	}

	public InputStream getBinaryStream(String columnName) throws SQLException {
		return rs.getBinaryStream( findColumn(columnName) );
	}

	public void updateBinaryStream(String columnName, InputStream x, int length) throws SQLException {
		rs.updateBinaryStream( findColumn(columnName), x, length );
	}

	public Blob getBlob(String columnName) throws SQLException {
		return rs.getBlob( findColumn(columnName) );
	}

	public void updateBlob(String columnName, Blob x) throws SQLException {
		rs.updateBlob( findColumn(columnName), x );
	}

	public boolean getBoolean(String columnName) throws SQLException {
		return rs.getBoolean( findColumn(columnName) );
	}

	public void updateBoolean(String columnName, boolean x) throws SQLException {
		rs.updateBoolean( findColumn(columnName), x );
	}

	public byte getByte(String columnName) throws SQLException {
		return rs.getByte( findColumn(columnName) );
	}

	public void updateByte(String columnName, byte x) throws SQLException {
		rs.updateByte( findColumn(columnName), x );
	}

	public byte[] getBytes(String columnName) throws SQLException {
		return rs.getBytes( findColumn(columnName) );
	}

	public void updateBytes(String columnName, byte[] x) throws SQLException {
		rs.updateBytes( findColumn(columnName), x );
	}

	public Reader getCharacterStream(String columnName) throws SQLException {
		return rs.getCharacterStream( findColumn(columnName) );
	}

	public void updateCharacterStream(String columnName, Reader x, int length) throws SQLException {
		rs.updateCharacterStream( findColumn(columnName), x, length );
	}

	public Clob getClob(String columnName) throws SQLException {
		return rs.getClob( findColumn(columnName) );
	}

	public void updateClob(String columnName, Clob x) throws SQLException {
		rs.updateClob( findColumn(columnName), x );
	}

	public Date getDate(String columnName) throws SQLException {
		return rs.getDate( findColumn(columnName) );
	}

	public Date getDate(String columnName, Calendar cal) throws SQLException {
		return rs.getDate( findColumn(columnName), cal );
	}

	public void updateDate(String columnName, Date x) throws SQLException {
		rs.updateDate( findColumn(columnName), x );
	}

	public double getDouble(String columnName) throws SQLException {
		return rs.getDouble( findColumn(columnName) );
	}

	public void updateDouble(String columnName, double x) throws SQLException {
		rs.updateDouble( findColumn(columnName), x );
	}

	public float getFloat(String columnName) throws SQLException {
		return rs.getFloat( findColumn(columnName) );
	}

	public void updateFloat(String columnName, float x) throws SQLException {
		rs.updateFloat( findColumn(columnName), x );
	}

	public int getInt(String columnName) throws SQLException {
		return rs.getInt( findColumn(columnName) );
	}

	public void updateInt(String columnName, int x) throws SQLException {
		rs.updateInt( findColumn(columnName), x );
	}

	public long getLong(String columnName) throws SQLException {
		return rs.getLong( findColumn(columnName) );
	}

	public void updateLong(String columnName, long x) throws SQLException {
		rs.updateLong( findColumn(columnName), x );
	}

	public Object getObject(String columnName) throws SQLException {
		return rs.getObject( findColumn(columnName) );
	}

	public Object getObject(String columnName, Map map) throws SQLException {
		return rs.getObject( findColumn(columnName), map );
	}

	public void updateObject(String columnName, Object x) throws SQLException {
		rs.updateObject( findColumn(columnName), x );
	}

	public void updateObject(String columnName, Object x, int scale) throws SQLException {
		rs.updateObject( findColumn(columnName), x, scale );
	}

	public Ref getRef(String columnName) throws SQLException {
		return rs.getRef( findColumn(columnName) );
	}

	public void updateRef(String columnName, Ref x) throws SQLException {
		rs.updateRef( findColumn(columnName), x );
	}

	public short getShort(String columnName) throws SQLException {
		return rs.getShort( findColumn(columnName) );
	}

	public void updateShort(String columnName, short x) throws SQLException {
		rs.updateShort( findColumn(columnName), x );
	}

	public String getString(String columnName) throws SQLException {
		return rs.getString( findColumn(columnName) );
	}

	public void updateString(String columnName, String x) throws SQLException {
		rs.updateString( findColumn(columnName), x );
	}

	public Time getTime(String columnName) throws SQLException {
		return rs.getTime( findColumn(columnName) );
	}

	public Time getTime(String columnName, Calendar cal) throws SQLException {
		return rs.getTime( findColumn(columnName), cal );
	}

	public void updateTime(String columnName, Time x) throws SQLException {
		rs.updateTime( findColumn(columnName), x );
	}

	public Timestamp getTimestamp(String columnName) throws SQLException {
		return rs.getTimestamp( findColumn(columnName) );
	}

	public void updateTimestamp(String columnName, Timestamp x) throws SQLException {
		rs.updateTimestamp( findColumn(columnName), x );
	}

	public Timestamp getTimestamp(String columnName, Calendar cal) throws SQLException {
		return rs.getTimestamp( findColumn(columnName), cal );
	}

	public InputStream getUnicodeStream(String columnName) throws SQLException {
		return rs.getUnicodeStream( findColumn(columnName) );
	}

	public URL getURL(String columnName) throws SQLException {
		return rs.getURL( findColumn(columnName) );
	}

	public void updateNull(String columnName) throws SQLException {
		rs.updateNull( findColumn(columnName) );
	}


	// ResultSet impl (delegated) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	public int getConcurrency() throws SQLException {
		return rs.getConcurrency();
	}

	public int getFetchDirection() throws SQLException {
		return rs.getFetchDirection();
	}

	public int getFetchSize() throws SQLException {
		return rs.getFetchSize();
	}

	public int getRow() throws SQLException {
		return rs.getRow();
	}

	public int getType() throws SQLException {
		return rs.getType();
	}

	public void afterLast() throws SQLException {
		rs.afterLast();
	}

	public void beforeFirst() throws SQLException {
		rs.beforeFirst();
	}

	public void cancelRowUpdates() throws SQLException {
		rs.cancelRowUpdates();
	}

	public void clearWarnings() throws SQLException {
		rs.clearWarnings();
	}

	public void close() throws SQLException {
		rs.close();
	}