MyBatis入门程序 之 查询用户 之 根据用户名模糊查询用户信息

0. 创建User类：

import lombok.Data;

@Data
public class User {
    private Integer id;
    private String username;
    private String jobs;
    private String phone;
}

1. 配置UserMapper.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="UserMapper">

    <!--根据用户编号，获取用户信息-->
    <select id="findUserById" parameterType="Integer" resultType="com.mason.User">
        select * from t_user where id = #{id}
    </select>

    <select id="findUserByName" parameterType="String" resultType="com.mason.User">
        select * from t_user where username like '%${value}%'
    </select>

</mapper>

2. 配置mabatis-config.xml MyBatis的核心配置文件

<?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>

    <!--配置环境-->
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///db_mybatis?serverTimezone=CTT"/>
                <property name="username" value="xxxxxxxx"/>
                <property name="password" value="xxxxxxxxxx"/>
            </dataSource>
        </environment>
    </environments>

    <!--配置mapper位置-->
    <mappers>
        <mapper resource="UserMapper.xml"/>
    </mappers>

</configuration>

3. 测试：

    @Test
    public void findUserByNameTest() throws Exception{
        InputStream inputStream = Resources.getResourceAsStream("mabatis-config.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        List<User> users = sqlSession.selectList("UserMapper.findUserByName", "g");
        for (User user : users) {
            System.out.println(user.toString());
        }
        sqlSession.close();
    }

4. 结果：
   
   
   找到这两条信息，因为名字里面都有“g”