package com.xjgs.dao;

import com.mchange.v2.c3p0.C3P0ProxyConnection;
import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCUtils {
    //创建数据库连接池对象
    private static ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource("his");

    //获取连接的方法
    public static Connection getConnection() throws SQLException {
        return comboPooledDataSource.getConnection();
    }

    //提供数据库连接池对象的方法
    public static DataSource getDataSource(){
        return comboPooledDataSource;
    }
    //释放资源的方法
    public static void release(ResultSet rs, Statement stmt, Connection conn) {

        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            rs = null;
        }
        release(stmt, conn);
    }

    public static void release(Statement stmt, Connection conn) {
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            stmt = null;
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            conn = null;
        }
    }
    public static Connection getRawConnection(Connection conn) {
        C3P0ProxyConnection cpCon = (C3P0ProxyConnection) conn;
        Connection unwrappedCon = null;
        try {
            Method rawConnectionMethod = JDBCUtils.class.getMethod("getRawConnection", new Class[]{Connection.class});
            unwrappedCon = (Connection) cpCon.rawConnectionOperation(rawConnectionMethod, null, new Object[]{C3P0ProxyConnection.RAW_CONNECTION});
        } catch (Exception ex) {
            //do something }
        }
        return conn;
    }
}