SSM项目从零开始到入门002-创建第一个maven项目

创建第一个maven项目

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编辑pom.xml文件  引入mysql驱动jar包

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.lcx.demo</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>

<dependencies>
<!-- MySql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.32</version>
</dependency>
</dependencies>

<build/>
</project>



maven会自动加载mysql的jar包到当前的项目当中



创建JDBC例子测试

package com.lcx.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Jdbc {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
//加载驱动
Class.forName("com.mysql.jdbc.Driver");
//建立连接
String url = "jdbc:mysql://localhost:3306/mybatis";
String user = "root";
String password ="root";
Connection conn = DriverManager.getConnection(url, user, password);
//获取statament对象 执行sql
String sql = "select * from tb_user where id=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setLong(1,1);
//执行sql得到结果集
ResultSet rs = ps.executeQuery();
//处理结果集
while (rs.next()) {
System.out.println(rs.getString("name"));
}
//关闭结果集 关闭的顺序由里向外
rs.close();
//关闭预加载
ps.close();
//关闭连接
conn.close();

}
}