ibatis相关

Posted 2020-11-11 素衣如岚

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 4 <!-- namespace:表示名称空间。现在的目的是区分id的. -->
 5 <mapper namespace="com.zhiyou100.zhl.dao.UsersDao">
 6     <!-- 根据id查询用户。id:标识该标签。
 7              parameterType:参数类型。可以写 也可以省略
 8              resultType:返回结果的类型。
 9              
10             #{id}:类似于EL表达式。 解析id的值
11      -->
12     
13     <select id="selByAge" parameterType="map" resultType="com.zhiyou100.zhl.bean.Users">
14         <![CDATA[select * from users where age>=#{min} and age<=#{max}]]>
15     </select> 
16     
17     <select id="getUser" parameterType="int" resultType="com.zhiyou100.zhl.bean.Users">
18           select * from users where id=#{id};
19     </select>
20     
21     <insert id="addUser" parameterType="com.zhiyou100.zhl.bean.Users" useGeneratedKeys="true" keyProperty="id">
22         insert into users(name,age) value(#{name},#{age});
23     </insert>
24     
25     <delete id="delUser" parameterType="int">
26         delete from users where id=#{id};
27     </delete>
28     
29     <update id="updateUser" parameterType="com.zhiyou100.zhl.bean.Users">
30         update users set name=#{name},age=#{age} where id=#{id};
31     </update>
32     
33     <select id="selAll" resultType="com.zhiyou100.zhl.bean.Users">
34         select * from users order by${columnName};
35     </select>
36 </mapper>

@Test
    void testAdd() {
        Users u=new Users("什么",21);
        usersdao.addUser(u);
        System.out.println(u.getId());
    }