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)
User.java实体类
public class User { private int id; private String name; private int age; //... }
ConditionUser.java
public class ConditionUser { private String name; private int minAge; private int maxAge; //... }
<!-- 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) 类似jstl表达式 --> <select id="getUser" parameterType="com.mybatis.test05.ConditionUser" resultType="com.mybatis.test05.User"> select * from d_user where <if test=‘name != "%null%"‘> name like #{name} and </if> age between #{minAge} and #{maxAge} </select>
测试
SqlSessionFactory factory = MybatisUtil.getFactory(); SqlSession session = factory.openSession(); String statement = "com.mybatis.test05.userMapper.getUser"; String name = "o"; name = null; ConditionUser parameter = new ConditionUser("%"+name+"%", 13, 18); List<User> list = session.selectList(statement, parameter); System.out.println(list); session.close();
MyBatis中可用的动态SQL标签
if
choose (when otherwise)
trim (where set)
foreach
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