MybatisPlus Warpper实现复杂查询
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测试类 ComplexQuery
package com.xiang;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.xiang.mapper.UserMapper;
import com.xiang.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/25 0:17
*/
@SpringBootTest
public class ComplexQuery {
@Autowired
UserMapper userMapper;
//创建QueryWrapper
QueryWrapper<User> wrapper = new QueryWrapper<User>();
//方法
//查所有wrapper
void findAll() {
List<User> list = userMapper.selectList(wrapper);
for (User user : list) {
System.out.println(user);
}
}
/**
* MybatisPlus Warpper实现复杂查询
*/
/**
* - ge：大于等于
* - gt：大于
* - le：小于等于
* - lt：小于
*/
@Test
void queryGe() {
wrapper.ge("age", 18);
findAll();
}
@Test
void queryGt() {
wrapper.gt("version", 0);
findAll();
}
@Test
void queryLe() {
wrapper.le("age", 18);
findAll();
}
@Test
void queryLt() {
wrapper.lt("deleted", 1);
findAll();
}
/**
* - eq：等于
* - ne：不等于
*/
@Test
void queryEq() {
wrapper.eq("username", "向某");
findAll();
}
@Test
void queryNe() {
wrapper.ne("username", "向某");
findAll();
}
/**
* - between：范围内的数据
*/
@Test
void queryBetween() {
wrapper.between("age", 18, 21);
findAll();
}
/**
* - like：模糊查询
*/
@Test
void queryLike() {
wrapper.like("username", "向");
findAll();
}
/**
* - orderByDesc：降序
* - orderByAsc：升序
*/
@Test
void queryOrderByDesc() {
wrapper.orderByDesc("age");
findAll();
}
@Test
void queryOrderByAsc() {
wrapper.orderByAsc("age");
findAll();
}
/**
* - last：最后可以拼接sql语句
*/
@Test
void queryLast() {
wrapper.last("limit 1,3");//分页查询（开始索引，每页展示条数）
findAll();
}
/**
* - select：指定要查询的列
*/
@Test
void querySelect() {
wrapper.select("username", "age");
findAll();
}
}
运行结果
ge：大于等于
JDBC Connection [HikariProxyConnection@362030306 wrapping com.mysql.cj.jdbc.ConnectionImpl@29bcf51d] will not be managed by Spring
==> Preparing: SELECT id,username,sex,age,birthday,create_time,update_time,version,deleted FROM user WHERE deleted=0 AND age >= ?
==> Parameters: 18(Integer)
<== Columns: id, username, sex, age, birthday, create_time, update_time, version, deleted
<== Row: 1, xiang, 男, 18, 2021-10-03, null, null, null, 0
<== Row: 559, 小向, 男, 18, 2021-10-04, null, null, null, 0
<== Row: 602, admin, 女, 18, 2021-10-20, null, null, null, 0
<== Row: 605, 小二, 女, 18, null, null, null, null, 0
<== Row: 607, 小四, 女, 21, null, null, null, null, 0
<== Row: 1452309953320730625, 小不点儿, null, 19, null, 2021-10-25 00:24:10, 2021-10-25 00:24:10, 1, 0
<== Total: 6
Time：30 ms - ID：com.xiang.mapper.UserMapper.selectList
Execute SQL：
SELECT
id,
username,
sex,
age,
birthday,
create_time,
update_time,
version,
deleted
FROM
user
WHERE
deleted=0
AND age >= 18
gt：大于
JDBC Connection [HikariProxyConnection@253171986 wrapping com.mysql.cj.jdbc.ConnectionImpl@7d4d8579] will not be managed by Spring
==> Preparing: SELECT id,username,sex,age,birthday,create_time,update_time,version,deleted FROM user WHERE deleted=0 AND version > ?
==> Parameters: 0(Integer)
<== Columns: id, username, sex, age, birthday, create_time, update_time, version, deleted
<== Row: 1452309953320730625, 小不点儿, null, 19, null, 2021-10-25 00:24:10, 2021-10-25 00:24:10, 1, 0
<== Total: 1
Time：40 ms - ID：com.xiang.mapper.UserMapper.selectList
Execute SQL：
SELECT
id,
username,
sex,
age,
birthday,
create_time,
update_time,
version,
deleted
FROM
user
WHERE
deleted=0
AND version > 0
le：小于等于
JDBC Connection [HikariProxyConnection@700249373 wrapping com.mysql.cj.jdbc.ConnectionImpl@1e54a6b1] will not be managed by Spring
==> Preparing: SELECT id,username,sex,age,birthday,create_time,update_time,version,deleted FROM user WHERE deleted=0 AND age <= ?
==> Parameters: 18(Integer)
<== Columns: id, username, sex, age, birthday, create_time, update_time, version, deleted
<== Row: 1, xiang, 男, 18, 2021-10-03, null, null, null, 0
<== Row: 559, 小向, 男, 18, 2021-10-04, null, null, null, 0
<== Row: 602, admin, 女, 18, 2021-10-20, null, null, null, 0
<== Row: 605, 小二, 女, 18, null, null, null, null, 0
<== Row: 609, 小五, 女, 0, null, null, null, null, 0
<== Row: 1451097869404868609, 向某, 男, 0, null, null, null, null, 0
<== Row: 1451098975287668738, 周某, 男, 0, null, null, null, null, 0
<== Total: 7
Time：38 ms - ID：com.xiang.mapper.UserMapper.selectList
Execute SQL：
SELECT
id,
username,
sex,
age,
birthday,
create_time,
update_time,
version,
deleted
FROM
user
WHERE
deleted=0
AND age <= 18
lt：小于
JDBC Connection [HikariProxyConnection@508864177 wrapping com.mysql.cj.jdbc.ConnectionImpl@f238e4f] will not be managed by Spring
==> Preparing: SELECT id,username,sex,age,birthday,create_time,update_time,version,deleted FROM user WHERE deleted=0 AND deleted < ?
==> Parameters: 1(Integer)
<== Columns: id, username, sex, age, birthday, create_time, update_time, version, deleted
<== Row: 1, xiang, 男, 18, 2021-10-03, null, null, null, 0
<== Row: 559, 小向, 男, 18, 2021-10-04, null, null, null, 0
<== Row: 602, admin, 女, 18, 2021-10-20, null, null, null, 0
<== Row: 605, 小二, 女, 18, null, null, null, null, 0
<== Row: 607, 小四, 女, 21, null, null, null, null, 0
<== Row: 609, 小五, 女, 0, null, null, null, null, 0
<== Row: 1451097869404868609, 向某, 男, 0, null, null, null, null, 0
<== Row: 1451098975287668738, 周某, 男, 0, null, null, null, null, 0
<== Row: 1452309953320730625, 小不点儿, null, 19, null, 2021-10-25 00:24:10, 2021-10-25 00:24:10, 1, 0
<== Total: 9
Time：26 ms - ID：com.xiang.mapper.UserMapper.selectList
Execute SQL：
SELECT
id,
username,
sex,
age,
birthday,
create_time,
update_time,
version,
deleted
FROM
user
WHERE
deleted=0
AND deleted < 1
等运行结果...
数据库表内容
