一、like(完全模糊,即“like ‘%val%’”)
实例:查询用户名称中包含“王”值的用户信息,如下:
QueryWrapper<UserBean> wrapper = new QueryWrapper<>(); wrapper.like("name", "王"); // 等价 SQL 语句:name like '%王%'
二、notLike(完全模糊取非,即“not like ‘%val%’”)
实例:查询用户包含“王”值的用户信息,如下:
QueryWrapper<UserBean> wrapper = new QueryWrapper<>(); wrapper.notLike("name", "王"); // 等价 SQL 语句:name not like '%王%'
三、likeLeft(仅左边模糊,即“like ‘%val’”)
实例:查询用户名以“王”值结束的用户信息列表,如下:
QueryWrapper<UserBean> wrapper = new QueryWrapper<>(); wrapper.likeLeft("name", "王"); // 等价 SQL 语句:name like '%王'
四、likeRight(仅右边模糊,即“like ‘val%’”)
实例:查询用户名以“王”值开始的用户信息列表,如下:
QueryWrapper<UserBean> wrapper = new QueryWrapper<>(); likeRight("name", "王"); // 等价 SQL 语句:name like '王%'
五、示例代码
package com.hxstrive.mybatis_plus.simple_mapper.condition; import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.hxstrive.mybatis_plus.mapper.SimpleMapper; import com.hxstrive.mybatis_plus.model.UserBean; import org.junit.jupiter.api.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import java.util.List; @RunWith(SpringRunner.class) @SpringBootTest class Condition7Test { @Autowired private SimpleMapper simpleMapper; @Test void contextLoads() { System.out.println("================== 分割线 (like '%佳%') ==================="); QueryWrapper<UserBean> wrapper = new QueryWrapper<>(); wrapper.like("name", "佳"); List<UserBean> userBeanList = simpleMapper.selectList(wrapper); for(UserBean userBean : userBeanList) { System.out.println(userBean); } System.out.println("================== 分割线 (not like '%佳%') ==================="); wrapper = new QueryWrapper<>(); wrapper.notLike("name", "佳"); userBeanList = simpleMapper.selectList(wrapper); System.out.println("result size=" + userBeanList.size()); for(int i = 0; i < (userBeanList.size() > 10 ? 10 : userBeanList.size()); i++) { System.out.println(userBeanList.get(i)); } System.out.println("================== 分割线 (like '黄%') ==================="); wrapper = new QueryWrapper<>(); wrapper.likeRight("name", "黄"); userBeanList = simpleMapper.selectList(wrapper); for(UserBean userBean : userBeanList) { System.out.println(userBean); } System.out.println("================== 分割线 (like '%佳') ==================="); wrapper = new QueryWrapper<>(); wrapper.likeLeft("name", "佳"); userBeanList = simpleMapper.selectList(wrapper); for(UserBean userBean : userBeanList) { System.out.println(userBean); } } }
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