Mybatis培训教程
7. 动态SQL与模糊查询
7.1. 提出需求:
实现多条件查询用户(姓名模糊匹配, 年龄在指定的最小值到最大值之间)
7.2. 准备数据表和数据:
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create table d_user( id int primary key auto_increment, name varchar(10), age int(3) );
insert into d_user(name,age) values('Tom',12); insert into d_user(name,age) values('Bob',13); insert into d_user(name,age) values('Jack',18); |
7.3. ConditionUser(查询条件实体类)
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private String name; private int minAge; private int maxAge; |
7.4. User(表实体类)
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private int id; private String name; private int age; |
7.5. userMapper.xml(映射文件)
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<?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.atguigu.day03_mybatis.test6.userMapper"> <select id="getUser" parameterType="com.atguigu.day03_mybatis.test6.ConditionUser" resultType="com.atguigu.day03_mybatis.test6.User"> select * from d_user where age>=#{minAge} and age<=#{maxAge} <if test='name!="%null%"'>and name like #{name}</if> </select> </mapper> |
7.6. UserTest(测试)
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public class UserTest {
public static void main(String[] args) throws IOException { Reader reader = Resources.getResourceAsReader("conf.xml"); SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader); SqlSession sqlSession = sessionFactory.openSession(); String statement = "com.atguigu.day03_mybatis.test6.userMapper.getUser"; List<User> list = sqlSession.selectList(statement, new ConditionUser("%a%", 1, 12)); System.out.println(list); } } |
MyBatis中可用的动态SQL标签
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