package com.yuan25.util;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 *
 * @Description 操作数据库的工具类
 *
 */

public class JDBCUtils {

    /**
     *
     * @Description 获取数据库的连接

     */
    public static Connection getConnection() throws Exception {
        // 1.读取配置文件中的4个基本信息
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("jdbc.properties");

        Properties pros = new Properties();
        pros.load(is);

        String user = pros.getProperty("user");
        String password = pros.getProperty("password");
        String url = pros.getProperty("url");
        String driverClass = pros.getProperty("driverClass");

        // 2.加载驱动
        Class.forName(driverClass);

        // 3.获取连接
        Connection conn = DriverManager.getConnection(url, user, password);
        return conn;
    }
    /**
     *
     * @Description 关闭连接和Statement的操作
     */
    public static void closeResource(Connection conn,Statement ps){
        try {
            if(ps != null)
                ps.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if(conn != null)
                conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    /**
     *
     * @Description 关闭资源操作

     */
    public static void closeResource(Connection conn,Statement ps,ResultSet rs){
        try {
            if(ps != null)
                ps.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if(conn != null)
                conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if(rs != null)
                rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}