Mybatis开发环境搭建实现数据的增删改查功能

zhaorong · 发表于 2017-5-25 15:26:31

本文介绍了Mybatis开发环境搭建实现数据的增删改查功能的教程，非常实用，有兴趣的同学快来看看吧
config.xml的配置

<?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>
<!--
拿到数据库信息，这是db.properties的内容
driver=com.MySQL.jdbc.Driver
url=jdbc:mysql://localhost:3306/usertest
username=root
password=root
--!>
<properties resource="db.properties">
</properties>
<!-- 别名优化--!>
<typeAliases>
<typeAlias type="com.leige.entity.User"alias="user"/>
</typeAliases>
<environmentsdefault="development">
<environment id="development">
<transactionManager type="jdbc"></transactionManager>
<dataSource type="POOLED">
<property name="driver"value="${driver}"/>
<property name="url"value="${url}"/>
<property name="username"value="${username}"/>
<property name="password"value="${password}"/>
</dataSource>
</environment>
</environments>
<!-- 使用xml，mapper resource需要设置--!>
<!-- <mappers>
<mapper resource="com/leige/entity/UserMappen.xml"></mapper>
</mappers> -->
<!--使用注解，mapper配置class，查询方法写在接口中--!>
<mappers>
<mapperclass="com.leige.impl.UserImpl"/>
</mappers>

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使用xml需要再配置一个mappen.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.leige.entity.UserMappen">
<select id="selectAll"resultType="user">
select * from user
</select>
<update id="insertUser"parameterType="user">
insert into user values (null,#{name},#{password},#{age})
</update>
</mapper>
使用注解则用接口
publicinterfaceUserImpl {
//更新用户，更新用@update，查询用@select，插入用@insert，删除使用@delete这些注解
@Update("update user set name=#{name} where id=#{id}")
publicvoidupdateUser(User user);
}
demo测试代码
publicclassDemo {
staticInputStream in =null;
staticSqlSessionFactory ssf =null;
static{
in = Demo.class.getClassLoader().getResourceAsStream("config.xml");
ssf =newSqlSessionFactoryBuilder().build(in);
}
publicstaticvoidmain(String[] args) {
//selectAll();
//insertUser();
updateUser();
}
//查询全部
publicstaticvoidselectAll(){
SqlSession session = ssf.openSession();
List<User> list = session.selectList("com.leige.entity.UserMappen.selectAll");
System.out.println(list);
session.close();
}
//增加用户
publicstaticvoidinsertUser(){
SqlSession session = ssf.openSession();
User user =newUser();
user.setName("小霸王");
user.setPassword("我是猪！a");
user.setAge(25);
intnum = session.insert("com.leige.entity.UserMappen.insertUser",user);
session.commit();
System.out.println(num);
session.close();
}
//修改用户信息
publicstaticvoidupdateUser(){
SqlSession session = ssf.openSession();
UserImpl userImpl = session.getMapper(UserImpl.class);
User user =newUser();
user.setName("我是大头鬼");
user.setPassword("我是猪！a");
user.setAge(25);
user.setId(79);
userImpl.updateUser(user);
session.commit();
session.close();
}
}
</configuration>

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[编程和数据库] Mybatis开发环境搭建实现数据的增删改查功能