package com.wzq.utils;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtils {
    private static DataSource ds;
    /*在加载这个类的时候创建数据链接池对象 并且获取指定的对象，如不指定默认获取c3p0-config.xml中的第一个default-config name="c3p0-config001"*/
    static {
        ds=new ComboPooledDataSource("c3p0-config001");
    }
    /*获取C3P0数据库连接*/
    public static Connection getConnection(){
        Connection conn = null;
        try {
            conn = ds.getConnection();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return conn;
    }
    /*操做释放资源*/
    public static void close(Statement stat, Connection conn) {
        if (stat != null) {
            try {
                stat.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    /*查询释放资源*/
    public static void close(ResultSet rs, Statement stat, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stat != null) {
            try {
                stat.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }



}