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  • JAVA日报

    用户管理系统开发(dbutil)

    util主要管数据库的连接 提供连接供其他层使用

    package dbutill;
    import java.sql.*;
    import java.util.Scanner;
    public class db {
    public static final String URL = "jdbc:mysql://localhost:3306/text?characterEncoding=utf8&useSSL=false&serverTimezone=UTC";
    public static final String USER = "root";
    public static final String PASSWORD = "123";
    public static final String DRIVER="com.mysql.cj.jdbc.Drive";
    public static Connection getConn () throws ClassNotFoundException {
    Connection conn=null;
    try {
    Class.forName(DRIVER);
    } catch (ClassNotFoundException e1) {
    // TODO 自动生成的 catch 块
    e1.printStackTrace();
    }
    try {
    conn = DriverManager.getConnection(URL,USER,PASSWORD);
    System.out.println("连接成功");

    } catch (SQLException e) {
    // TODO: handle exception
    e.printStackTrace();
    }
    return conn;
    }
    public static void close (Statement state, Connection conn) {
    if (state != null) {
    try {
    state.close();
    } catch (SQLException e) {
    e.printStackTrace();
    }
    }
    if (conn != null) {
    try {
    conn.close();
    } catch (SQLException e) {
    e.printStackTrace();
    }
    }
    }
    public static void close (ResultSet rs, Statement state, Connection conn) {
    if (rs != null) {
    try {
    rs.close();
    } catch (SQLException e) {
    e.printStackTrace();
    }
    }
    if (state != null) {
    try {
    state.close();
    } catch (SQLException e) {
    e.printStackTrace();
    }
    }

    if (conn != null) {
    try {
    conn.close();
    } catch (SQLException e) {
    e.printStackTrace();
    }
    }
    }
    public static void main(String[] args) throws Exception {
    Connection conn=getConn();
    // conn.close();
    }

    }

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  • 原文地址:https://www.cnblogs.com/mumulailai/p/14906028.html
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