001
014
015 package com.liferay.portal.kernel.upgrade.dao.orm;
016
017 import com.liferay.portal.kernel.util.ProxyUtil;
018 import com.liferay.portal.util.PortalUtil;
019
020 import java.lang.reflect.InvocationHandler;
021 import java.lang.reflect.InvocationTargetException;
022 import java.lang.reflect.Method;
023
024 import java.sql.Connection;
025 import java.sql.DatabaseMetaData;
026 import java.sql.PreparedStatement;
027 import java.sql.ResultSet;
028 import java.sql.SQLException;
029
030
033 public class UpgradeOptimizedConnectionHandler implements InvocationHandler {
034
035 public UpgradeOptimizedConnectionHandler(Connection connection)
036 throws SQLException {
037
038 _connection = connection;
039
040 DatabaseMetaData metaData = _connection.getMetaData();
041
042 String productName = metaData.getDatabaseProductName();
043
044 if (productName.equals("Microsoft SQL Server")) {
045 _useUpgradeOptimizedPreparedStatementHandler = true;
046 }
047 }
048
049 public Object invoke(Object proxy, Method method, Object[] arguments)
050 throws Throwable {
051
052 try {
053 String methodName = method.getName();
054
055 if (methodName.equals("prepareStatement") &&
056 (arguments.length == 1)) {
057
058 return prepareStatement((String)arguments[0]);
059 }
060
061 return method.invoke(_connection, arguments);
062 }
063 catch (InvocationTargetException ite) {
064 throw ite.getTargetException();
065 }
066 }
067
068 protected PreparedStatement prepareStatement(String sql)
069 throws SQLException {
070
071 Thread currentThread = Thread.currentThread();
072
073 ClassLoader classLoader = currentThread.getContextClassLoader();
074
075 sql = PortalUtil.transformSQL(sql);
076
077 if (!_useUpgradeOptimizedPreparedStatementHandler) {
078 return _connection.prepareStatement(sql);
079 }
080
081 PreparedStatement preparedStatement = _connection.prepareStatement(
082 sql, ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
083
084 return (PreparedStatement)ProxyUtil.newProxyInstance(
085 classLoader, new Class[] {PreparedStatement.class},
086 new UpgradeOptimizedPreparedStatementHandler(preparedStatement));
087 }
088
089 private Connection _connection;
090 private boolean _useUpgradeOptimizedPreparedStatementHandler;
091
092 }