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MyBatis实战
MyBatis 是支持定制化 SQL、存储过程以及高级映射的优秀的持久层框架。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以对配置和原生Map使用简单的 XML 或注解，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。
说明，本系列教程所有的代码均是在Intellij Idea 16.02版本的IDE上编写的。1.项目结构
项目结构
2.添加依赖
mybatis-3.4.1.jar
mysql-connector-java-6.0.3.jar
hamcrest-core-1.3.jar
junit-4.12.jar
1.创建数据库和数据表
创建数据表
SET NAMES utf8;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for `users`
-- ----------------------------
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(45) NOT NULL,
`pwd` varchar(45) NOT NULL,
`age` int(11) NOT NULL ,
`email` varchar(45) NOT NULL ,
`tel` varchar(45) NOT NULL,
`addr` varchar(45) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=580317 DEFAULT CHARSET=utf8;
向表中添加数据
INSERT INTO `users`
VALUES
(‘580314‘, ‘Richard‘, ‘123456‘, ‘21‘, ‘1105351276@qq.com‘, ‘13627341394‘, ‘ISS‘),
(‘580315‘, ‘QinJiangbo‘, ‘123456‘, ‘22‘, ‘1105351276@qq.com‘, ‘13627341394‘, ‘Hongshan Square‘),
(‘580316‘, ‘Oliver‘, ‘whuiss‘, ‘22‘, ‘2456281765@qq.com‘, ‘13627341394‘, ‘ISS‘);
2.创建用户POJO类User.java
package com.qinjiangbo.pojo;
/**
* Date: 9/13/16
* Author: qinjiangbo@github.io
*/
public class User {
// 实体类的属性名称和数据库中的字段名称要一一对应起来
private long id;
private String name;
private String pwd;
private int age;
private String email;
private String tel;
private String addr;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getTel() {
return tel;
}
public void setTel(String tel) {
this.tel = tel;
}
public String getAddr() {
return addr;
}
public void setAddr(String addr) {
this.addr = addr;
}
public String toString() {
return "User{" +
"id=" + id +
", name=‘" + name + ‘\‘‘ +
", pwd=‘" + pwd + ‘\‘‘ +
", age=" + age +
", email=‘" + email + ‘\‘‘ +
", tel=‘" + tel + ‘\‘‘ +
", addr=‘" + addr + ‘\‘‘ +
‘}‘;
}
}
3.添加MyBatis的配置文件configure.xml
<?xml version="1.0" encoding="UTF-8" ?>
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
<property name="username" value="Richard"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- 注册Mapper映射XML文件 -->
<mapper resource="com/qinjiangbo/dao/UserMapper.xml"></mapper>
</mappers>
</configuration>
NOTE 上面是数据库相关的配置，各位读者可以根据自己的实际情况进行相应的配置。
4.编写Mapper映射XML文件
<?xml version="1.0" encoding="UTF-8" ?>
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qinjiangbo.dao.UserMapper">
<select id="findUserById" parameterType="int"
resultType="com.qinjiangbo.pojo.User">
SELECT * FROM users WHERE id = #{id}
</select>
</mapper>
5.编写测试实例
package com.qinjiangbo.test;
import com.qinjiangbo.pojo.User;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.InputStream;
/**
* Date: 9/13/16
* Author: qinjiangbo@github.io
*/
public class MyBatisTest1 {
public void testFindUserById() {
// 注意这个地方,不少人会直接写configure.xml, 这样会一直取不到值,从而报空指针,
// 需要写全这个资源的全路径
String config = "com/qinjiangbo/conf/configure.xml";
InputStream inputStream = MyBatisTest1.class.getClassLoader().getResourceAsStream(config);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = factory.openSession();
String statement = "com.qinjiangbo.dao.UserMapper.findUserById";
User user = sqlSession.selectOne(statement, 580314);
System.out.println(user);
}
}
6.测试结果
稿源：勤快学QKXue.NET
扩展阅读：
MyBatis实战（一）
http://qkxue.net/info/24308/MyBatis
MyBatis实战（三）
http://qkxue.net/info/29369/MyBatis
MyBatis实战（四）
http://qkxue.net/info/30378/MyBatis
MyBatis实战（五）
http://qkxue.net/info/31568/MyBatis
MyBatis实战（六）
http://qkxue.net/info/33106/MyBatis
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原文地址：http://www.cnblogs.com/qkxue/p/5910944.html
