pem catalog his new rac valid != blob rollback

import java.io.PrintWriter;
import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
import java.util.logging.Logger;

import javax.sql.DataSource;

import org.junit.Test;

public class test {@Test
br/>@Test
Connection connection = null;
PreparedStatement prepareStatement = null;
try {
DataSource dataSource = new MyDataSource();
connection = dataSource.getConnection();

String sql ="insert into product values (null,?,?,?)";
prepareStatement = connection.prepareStatement(sql);
prepareStatement.setString(1, "檸檬");
prepareStatement.setDouble(2, 10.00);
prepareStatement.setObject(3, new Date());
int executeUpdate = prepareStatement.executeUpdate();
if(executeUpdate!=0){
System.out.println("插入成功");
}else{
System.out.println("插入失敗");
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
if(prepareStatement!=null){
prepareStatement.close();
}
if(connection!=null){
connection.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}

}

}
class MyDataSource implements DataSource{
List<Connection> list = new ArrayList<Connection>();
public MyDataSource() {//我的鏈接池一初始化就有5個鏈接
for (int i = 0; i < 5; i++) {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
list.add(connection);
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}

    }
}
/**
 * 獲得增強後的鏈接
 */
@Override
public Connection getConnection() throws SQLException {
    Connection connection = list.remove(0);
    ConnectionWrapper connectionWrapper = new ConnectionWrapper(connection, list);
    return connectionWrapper;
}
@Override
public PrintWriter getLogWriter() throws SQLException {
    return null;
}

@Override
public void setLogWriter(PrintWriter out) throws SQLException {
}

@Override
public void setLoginTimeout(int seconds) throws SQLException {
    // TODO Auto-generated method stub

}

@Override
public int getLoginTimeout() throws SQLException {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public Logger getParentLogger() throws SQLFeatureNotSupportedException {
    // TODO Auto-generated method stub
    return null;
}

@Override
public <T> T unwrap(Class<T> iface) throws SQLException {
    // TODO Auto-generated method stub
    return null;
}

@Override
public boolean isWrapperFor(Class<?> iface) throws SQLException {
    // TODO Auto-generated method stub
    return false;
}

@Override
public Connection getConnection(String username, String password) throws SQLException {
    // TODO Auto-generated method stub
    return null;
}

}
/*

• 增強的類
• 缺點：被增強類中如果有多個方法，增強類中需要多次調用

• @author WangShuang
  */
  class ConnectionWrapper implements Connection{
  private Connection con;
  private List<Connection> list;

  public ConnectionWrapper(Connection con,List<Connection> list) {
      this.con=con;
      this.list=list;
  }
  @Override
  public void close() throws SQLException {
      list.add(con);
  }
  @Override
  public <T> T unwrap(Class<T> iface) throws SQLException {
      return con.unwrap(iface);
  }
  
  @Override
  public boolean isWrapperFor(Class<?> iface) throws SQLException {
      return con.isWrapperFor(iface);
  }
  
  @Override
  public Statement createStatement() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public PreparedStatement prepareStatement(String sql) throws SQLException {
      return con.prepareStatement(sql);
  }
  
  @Override
  public CallableStatement prepareCall(String sql) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public String nativeSQL(String sql) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void setAutoCommit(boolean autoCommit) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public boolean getAutoCommit() throws SQLException {
      // TODO Auto-generated method stub
      return false;
  }
  
  @Override
  public void commit() throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void rollback() throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public boolean isClosed() throws SQLException {
      // TODO Auto-generated method stub
      return false;
  }
  
  @Override
  public DatabaseMetaData getMetaData() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void setReadOnly(boolean readOnly) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public boolean isReadOnly() throws SQLException {
      // TODO Auto-generated method stub
      return false;
  }
  
  @Override
  public void setCatalog(String catalog) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public String getCatalog() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void setTransactionIsolation(int level) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public int getTransactionIsolation() throws SQLException {
      // TODO Auto-generated method stub
      return 0;
  }
  
  @Override
  public SQLWarning getWarnings() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void clearWarnings() throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
          throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency)
          throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Map<String, Class<?>> getTypeMap() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void setHoldability(int holdability) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public int getHoldability() throws SQLException {
      // TODO Auto-generated method stub
      return 0;
  }
  
  @Override
  public Savepoint setSavepoint() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Savepoint setSavepoint(String name) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void rollback(Savepoint savepoint) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void releaseSavepoint(Savepoint savepoint) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
          throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
          int resultSetHoldability) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
          int resultSetHoldability) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Clob createClob() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Blob createBlob() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public NClob createNClob() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public SQLXML createSQLXML() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public boolean isValid(int timeout) throws SQLException {
      // TODO Auto-generated method stub
      return false;
  }
  
  @Override
  public void setClientInfo(String name, String value) throws SQLClientInfoException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void setClientInfo(Properties properties) throws SQLClientInfoException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public String getClientInfo(String name) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Properties getClientInfo() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void setSchema(String schema) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public String getSchema() throws SQLException {
      // TODO Auto-generated method stub
      return null;
  }
  
  @Override
  public void abort(Executor executor) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public int getNetworkTimeout() throws SQLException {
      // TODO Auto-generated method stub
      return 0;
  }

  }

連接池增強close方法的原理