【Mybaits学习】02_ 快速入门

最新推荐文章于 2025-09-12 18:08:49 发布

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原文链接：http://www.cnblogs.com/hylinux/p/6503269.html

文章标签：

#java #ui #数据库

本文详细介绍如何使用MyBatis框架进行快速入门，包括搭建Maven环境、添加依赖、配置数据库连接、定义实体类及SQL映射文件等关键步骤，并通过示例代码演示如何执行SQL查询。

Mybatis快速入门(mysql)---Maven环境

1、添加Mybatis jar包

		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.0</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->

		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>6.0.2</version>
		</dependency>

2、本地数据库建表

3、添加Mybatis的配置文件,以及db.properties文件

db.properties文件

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3307/mybaits?serverTimezone=UTC
db.username=root
db.password=123456

Mybaits.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<properties resource="db.properties"></properties>

	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="${db.driver}" />
				<property name="url" value="${db.url}" />
				<property name="username" value="${db.username}" />
				<property name="password" value="${db.password}" />
			</dataSource>
		</environment>
	</environments>


</configuration>

4、定义实体类

package nh.ui.automation.tools.Mybaits;

/**
 * 项目 ：UI自动化测试 Mybaits 类描述：
 * 
 * @author Eric
 * @date 2017年3月4日 nh.ui.automation.tools.Mybaits
 */
public class User {
	private int id;
	private String name;
	private int age;

	/**
	 * @param id
	 * @param name
	 * @param age
	 */
	public User(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */

	/**
	 * 
	 */
	public User() {
		super();
	}

	/**
	 * @param name
	 * @param age
	 */
	public User(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
	}

	/**
	 * @return the id
	 */
	public int getId() {
		return id;
	}

	/**
	 * @param id
	 *            the id to set
	 */
	public void setId(int id) {
		this.id = id;
	}

	/**
	 * @return the name
	 */
	public String getName() {
		return name;
	}

	/**
	 * @param name
	 *            the name to set
	 */
	public void setName(String name) {
		this.name = name;
	}

	/**
	 * @return the age
	 */
	public int getAge() {
		return age;
	}

	/**
	 * @param age
	 *            the age to set
	 */
	public void setAge(int age) {
		this.age = age;
	}

}

5、定义操作user表的sql映射文件userMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="nh.ui.automation.tools.Mybaits.User.userMapper">
    <select id="getUser" parameterType="int"
        resultType="nh.ui.automation.tools.Mybaits.User">
        select * from user where id=#{id}
    </select>

</mapper>

6、在Mybaits.xml文件中注册userMapper.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="db.properties"></properties>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${db.driver}" />
                <property name="url" value="${db.url}" />
                <property name="username" value="${db.username}" />
                <property name="password" value="${db.password}" />
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="Mappings/userMapper.xml"/>
    </mappers>
</configuration>

7、测试代码

public class App 
{
    public static void main( String[] args )
    {
        /**
         * 1,加载mybaits的配置文件
         * 2,构建sqlsession工厂
         * 3,创建能执行sql的会话
         * 4,映射sql的标识字符串
         * 5,执行sql
         * 6,打印结果
         */
        
        String myBaitsConifg = "Mybaits.xml";
        InputStream loadConfig = App.class.getClassLoader().getResourceAsStream(myBaitsConifg);
        
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(loadConfig);
        SqlSession sqlSession = sessionFactory.openSession(true);
           //这里就是mybaits文件中的namespace+方法
        String statement = "nh.ui.automation.tools.Mybaits.User.userMapper.getUser";
        //执行sql并传递值
        User user1 = sqlSession.selectOne(statement, 1);
        User user2 = sqlSession.selectOne(statement, 2);
        System.out.println(user1);
        System.out.println(user2);
   }

}