本文主要介绍了如何使用mybatis进行简单的数据库操作。本人使用的是mybatis3.05。
1.创建数据库表（User表）
CREATETABLE `NewTable` (
`userId` bigint(20) NOTNULL AUTO_INCREMENT ,
`userName` varchar(30) CHARACTERSET utf8 COLLATE utf8_general_ci NOTNULL ,
`password` varchar(80) CHARACTERSET utf8 COLLATE utf8_general_ci NOTNULL ,
`comment` varchar(250) CHARACTERSET utf8 COLLATE utf8_general_ci NULLDEFAULTNULL ,
PRIMARYKEY (`userId`),
UNIQUEINDEX `UQ_User_userName` (`userName`) USING BTREE
)
2.2. 创建实体类
package com.mybatis.config;
publicclass User {
privateint userId;
private String userName;
private String password;
private String comment;
publicint getUserId() {
return userId;
}
publicvoid setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
publicvoid setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
publicvoid setPassword(String password) {
this.password = password;
}
public String getComment() {
return comment;
}
publicvoid setComment(String comment) {
this.comment = comment;
}
}
3. 定义数据访问接口
package com.mybatis.config;
import java.util.List;
publicinterface UserDao {
publicint insert(User user);
publicint update(User user);
publicint delete(String userName);
public List<User> selectAll();
publicint countAll();
public User findByUserName(String userName);
}
4.创建MyBatis映射文件（UserDaoMapper.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="com.mybatis.config.UserDao">
<select id="countAll" resultType="int">
select count(*) c from user;
</select>
<select id="selectAll" resultType="com.mybatis.config.User">
select * from user order by userName asc
</select>
<insert id="insert" parameterType="com.mybatis.config.User">
insert into user(userName,password,comment) values(#{userName},#{password},#{comment})
</insert>
<update id="update" parameterType="com.mybatis.config.User">
update user set userName=#{userName},password=#{password},comment=#{comment} where userName=#{userName}
</update>
<delete id="delete" parameterType="int">
delete from user where userName=#{userName}
</delete>
<select id="findByUserName" parameterType="String" resultType="com.mybatis.config.User">
select * from user where userName=#{userName}
</select>
</mapper>
5. 创建mybatis配置文件
<?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>
<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/hlp?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"/>
<property name="username" value="root"/>
<property name="password" value="1234"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/mybatis/config/UserDaoMapper.xml"/>
</mappers>
</configuration>
6. 编写测试代码
package com.mybatis.config;
import java.io.Reader;
import java.util.Iterator;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
publicclass UserDaoTest {
@Test
publicvoid userDaoTest() throws Exception
{
String resource ="MyBatis-Configuration.xml";
Reader reader = Resources.getResourceAsReader(resource);
SqlSessionFactoryBuilder builder =new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(reader);
SqlSession session = factory.openSession();
UserDao userDao = session.getMapper(UserDao.class);
User user =new User();
user.setUserName("hongye");
user.setPassword("123456");
user.setComment("备注");
userDao.insert(user);
System.out.println("记录条数："+userDao.countAll());
List<User> users = userDao.selectAll();
Iterator<User> iter = users.iterator();
while(iter.hasNext()){
User u = iter.next();
System.out.println("用户名："+u.getUserName()+"密码："+u.getPassword());
}
user.setComment("comment");
userDao.update(user);
User u = userDao.findByUserName("hongye");
System.out.println(u.getComment());
userDao.delete("hongye");
System.out.println("记录条数："+userDao.countAll());
session.commit();
session.close();
}
}