/*
* _Connection.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Author: Winter Lau
* http://dlog4j.sourceforge.net
*
*/
package com.liusoft.util.db;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.sql.Statement;
/**
* �ӹ����ݿ����ӣ���ֹ����ijЩ���ݿⲻ֧����������׳����쳣
* @author Winter Lau
*/
public class _Connection implements InvocationHandler {
private Class[] infs;
private Connection conn;
private boolean supportTransaction;
private boolean coding;
public _Connection(Connection conn, boolean coding) {
this.conn = conn;
this.coding = coding;
DatabaseMetaData dm = null;
try{
dm = conn.getMetaData();
supportTransaction = dm.supportsTransactions();
infs = conn.getClass().getInterfaces();
if(infs==null || infs.length==0)
infs = IC;
}catch(Exception e){}
}
/**
* ��ȡ����Ĵ���
* @return
*/
public Connection getConnection() {
return (Connection)Proxy.newProxyInstance(
conn.getClass().getClassLoader(),infs, this);
}
void close() throws SQLException {
conn.close();
}
public Object invoke(Object proxy, Method m, Object args[]) throws Throwable
{
String method = m.getName();
if ((M_SETAUTOCOMMIT.equals(method) ||
M_COMMIT.equals(method) ||
M_ROLLBACK.equals(method))
&& !isSupportTransaction())
return null;
Object obj = null;
try {
obj = m.invoke(conn, args);
if (CREATESTATEMENT.equals(method)||PREPAREDSTATEMENT.equals(method))
return (new _Statement((Statement) obj, coding)).getStatement();
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
return obj;
}
public boolean isSupportTransaction() {
return supportTransaction;
}
private static final Class[] IC = new Class[]{Connection.class};
private static final String PREPAREDSTATEMENT = "prepareStatement";
private static final String CREATESTATEMENT = "createStatement";
private static final String M_SETAUTOCOMMIT = "setAutoCommit";
private static final String M_COMMIT = "commit";
private static final String M_ROLLBACK = "rollback";
}