MyBatis初探之环境的配置

文章由LinuxBoy分享于2019-03-31 01:03:55热评（99）

MyBatis初探之环境的配置

很早之前就想学习mybatis,据说很多公司都使用这个框架。以前我都使用老掉牙的DBCP，Hibernate感觉太大，现在来学学这个中性的框架。

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首先是环境的配置，我使用maven创建项目，pom.xml文件如下

<groupId>com.bird</groupId>
<artifactId>concursey</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>concursey</name>
<url>http://maven.apache.org</url>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.7</version>
</dependency>

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

还得创建一个数据库和对应的一张表做示范，这里就不写了，直接上对应的JavaBean

package com.bird.mybatis.bean;

public class Users {

private int id;
private String name;
private int age;

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

@Override
public String toString() {
return "Users [id=" + id + ", name=" + name + ", age=" + age + "]";
}

}

然后要给对应的JavaBean创建对应的mapper.xml文件，内容如下

<?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="com.bird.mybatis.bean.userMapper">

<select id="getUser" parameterType="int" resultType="com.bird.mybatis.bean.Users">
select * from users where id = #{id}
</select>
</mapper>

当然还有mybatis的全局文件，conf.xml内容如下

<?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>

<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis" />
<property name="username" value="root" />
<property name="password" value="root" />
</dataSource>
</environment>
</environments>

<mappers>
<mapper resource="com/bird/mybatis/bean/userMapper.xml" />
</mappers>

</configuration>

最后是测试代码

package com.bird.mybatis.bean;

import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class Test {

public static void main(String[] args) throws Exception {
String resource = "conf.xml";
Reader reader = Resources.getResourceAsReader(resource);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sessionFactory.openSession();
String statement = "com.bird.mybatis.bean.userMapper.getUser";
Users user = session.selectOne(statement, 1);
System.out.println(user);
}
}

总体来说还是非常简单的。

MyBatis 的详细介绍：请点这里
MyBatis 的下载地址：请点这里

本文永久更新链接地址：

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