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MybatisPlus Warpper实现复杂查询

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MybatisPlus Warpper实现复杂查询MybatisPlusWarpper实现复杂查询关于博客[整合MybatisPlus测试][MybatisPlus自动填充时间][MybatisPlus乐观锁][MybatisPlus物理删除、逻辑删除][MybatisPlus性能分析插件]测试类ComplexQuerypack

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MybatisPlus Warpper实现复杂查询

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[MybatisPlus性能分析插件]

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

MybatisPlus Warpper实现复杂查询

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