java JDBC测试

package com.jdbc.test;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import com.mysql.jdbc.Connection;


public class JdbcTest1 {
    
    public static Connection getConnection(){
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");　　//加载驱动
            conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb?useUnicode=true&characterEncoding=utf-8&useSSL=false","root","123456");　　//连接数据库
        } catch (ClassNotFoundException | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }
    
    public static void select(){
        Connection conn = getConnection();
        String sql = "select *from book1";
        try {
            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery(sql);　　//执行SQL语句
            while(rs.next()){
                System.out.print(rs.getString("use_name")+" ");
                System.out.println(rs.getInt("use_age")+" ");
            }
            rs.close();
            st.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void insert(){
        Connection conn = getConnection();
        String sql = "insert into book1 values(‘lixiaoming‘,25)";
        try {
            Statement st = conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("已经向表中插入"+count+"条数据");
            st.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public static void delete(){
        Connection conn = getConnection();
        String sql = "delete from book1 where use_age = 25";
        try {
            Statement st = conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("从表中删除了"+count+"条数据");
            st.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    
    public static void update(){
        Connection conn = getConnection();
        String sql = "update  book1 set use_age=30 where use_name = ‘zhangsan‘";
        try {
            Statement st = conn.createStatement();
            int count = st.executeUpdate(sql);
            System.out.println("从表中更新了"+count+"条数据");
            st.close();
            conn.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        select();
//        insert();
//        delete();
//        update();
    }
}