三,MyBatis-Plus 的各种查询的“超详细说明”,比如(等值查询,范围查询,模糊查询...)

三,MyBatis-Plus 的各种查询的“超详细说明”,比如(等值查询,范围查询,模糊查询...)

@


1. 条件构造器介绍

在实际开发需求中条件查询是非常普遍的,接下来我们就来讲解如何使用 MyBatis Plus 完成条件查询。

首先,想要使用 MyBatis Plus 完成条件查询,基于面向对象的思想,万物皆对象 ,那么查询条件,也需要使用对象来完成封装。我们可以先看看,在 MyBatis Plus 中和条件有关的类有哪些,他们之间有什么关系,理清楚了这个,我们在传递条件对象的时候,就很清晰了。

Wrapper 抽象类,条件类的顶层,提供了一些获取和判断相关的方法。

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AbstractWrapper 抽象类,Wrapper 的子类,提供了所有的条件相关方法。

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AbstractLambdaWrapper 抽象类,AbstractWrapper 的子类,确定字段参数为方法引用类型。

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QueryWrapper 类,AbstractWrapper 的子类,如果我们需要传递 String 类型的字段信息,创建该对象。

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LambdaQueryWrapper 类,AbstractLambdaWrapper 的子类,如果我们需要传递方法引用方式的字段信息,创建该对象。

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该图为以上各类的关系,我们在编写代码的时候,只需要关注 QueryWrapperLambdaQueryWrapper

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2. 准备工作:

引入相关的jar 依赖。在 pom.xml 文件当中;

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.rainbowsea</groupId>
    <artifactId>mp03</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mp03</name>
    <description>mp03</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--        spring boot web 依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--        mysql 驱动依赖-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>



        <!--        lombok 的依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <!--        druid-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!--        mybatis-plus 的依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <releases>
                <enabled>false</enabled>
            </releases>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <releases>
                <enabled>false</enabled>
            </releases>
        </pluginRepository>
    </pluginRepositories>

</project>

编写项目的场景启动器:

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package com.rainbowsea;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Mp03Application {

    public static void main(String[] args) {
        SpringApplication.run(Mp03Application.class, args);
    }

}

创建的数据库表和结构。如下:

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编写对应 数据表的 Java Bean 类对象。

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package com.rainbowsea.bean;


import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {

    private Long id;
    //@TableField(value = "username")
    private String name;

    //@TableField(select = false)  // 查询时,不对age 字段进行查询
    private Integer age;
    private String email;

    @TableField(value = "`desc`") // 注意:有两层,但最里面的哪个不是引号
    private String desc;


    @TableField(exist = false)  // 表示// ,不让该 online 属性,作为 SQL语句当中的查询字段
    private Integer online;

}

在 resources 类路径下,创建一个名为 application.yaml 的yaml文件,编写连接数据库的信息内容。

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spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatisplus?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false
    username: root
    password: MySQL123
  main:
    banner-mode: off  #关闭 spring boot  在命令行当中的图标显示


mybatis-plus:
  global-config:
    banner: false  # 关闭 mybatis-plus 在命令行当中的图标显示
    db-config:
      table-prefix: rainbowsea_ # 还可以通过统一添加前缀的方式:

  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  # 开启 Log 日志信息打印
    map-underscore-to-camel-case: true # 开启驼峰,下划线映射规则

编写配置类,通过配置类的方式,将数据库连接池换成为 Druid 数据库连接池。

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package com.rainbowsea.config;


import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@Configuration  // 标注配置类
public class DruidDataSourceConfig {

    @Bean
    @ConfigurationProperties(value = "spring.datasource")
    public DataSource getDataSource() {
        DruidDataSource druidDataSource = new DruidDataSource();

        return druidDataSource;
    }
}

运行测试:看看是否切换为了 Druid 数据库连接池

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package com.rainbowsea;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.annotation.Resource;

@SpringBootTest
class Mp03ApplicationTests {


    @Resource
    //@Autowired
    private JdbcTemplate jdbcTemplate;

    @Test
    void getDataSourceTest() {
        System.out.println(jdbcTemplate.getDataSource().getClass());
    }

}

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编写:该User表的 mapper 方法。

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package com.rainbowsea.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.rainbowsea.bean.User;
import org.apache.ibatis.annotations.Mapper;


@Mapper  // 包扫描路径
public interface UserMapper extends BaseMapper<User> {


}

3. 等值查询

3.1 eq (条件筛选属性 = ?)

使用QueryWrapper对象,构建查询条件

等值查询使用:userQueryWrapper.eq()


default Children eq(R column, Object val) {
   return eq(true, column, val);
}

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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {
    @Autowired
    private UserMapper userMapper;

    @Test
    void eq() {
        // 1.创建条件查询对象
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        // 2. 设置查询条件,指定查询的字段和匹配的值
        QueryWrapper<User> eq = userQueryWrapper.eq("name", "Jone");

        // 3. 进行条件查询
        User user = userMapper.selectOne(eq);
        System.out.println(user);
    }
}

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我们思考如果每次都是自己进行字段名称的编写,有可能会出现名称写错的情况,怎么避免这种情况呢,我们可以使用LambdaQueryWrapper对象,在构建字段时,使用方法引用的方式来选择字段,这样做可以避免字段拼写错误出现问题。

代码如下:

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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {
    @Autowired
    private UserMapper userMapper;

    // 使用: LambdaQueryWrapper 进行引用查询,防止报错
    @Test
    void eq2() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        LambdaQueryWrapper<User> queryWrapper = lambdaQueryWrapper.eq(User::getName, "Jone");

        User user = userMapper.selectOne(queryWrapper);
        System.out.println(user);
    }
}

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还要考虑一种情况,我们构建的条件是从哪里来的?应该是从客户端通过请求发送过来的,

由服务端接收的。在网站中一般都会有多个条件入口,用户可以选择一个或多个条件进行查询,那这个时候在请求时,我们不能确定所有的条件都是有值的,部分条件可能用户没有传值,那该条件就为null。

​ 比如在电商网站中,可以选择多个查询条件。

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那为null的条件,我们是不需要进行查询条件拼接的,否则就会出现如下情况,将为null的条件进行拼接,筛选后无法查询出结果。

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当然我们要解决这个问题,可以先判断是否为空,根据判断结果选择是否拼接该字段,这个功能其实不需要我们写,由MybatisPlus的方法已经提供好了。

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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {
    @Autowired
    private UserMapper userMapper;

    // 字段名为 不null的
    @Test
    void isNull2() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        String name = null;
        //String name = "Jone";

        //  public Children eq(boolean condition, R column, Object val) {
        lambdaQueryWrapper.eq(name != null, User::getName, name);
        //User user = userMapper.selectOne(lambdaQueryWrapper);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);

    }
}

在这里插入图片描述

3.2 allEq(满足多个条件字段的值的筛选)

先演示一下如何通过多个eq,构建多条件查询。

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // and 满足多个条件
    @Test
    void allEql() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(User::getName, "Tom");
        lambdaQueryWrapper.eq(User::getAge, 18);
        User user = userMapper.selectOne(lambdaQueryWrapper);
        System.out.println(user);
    }
}

如果此时有多个条件需要同时判断,我们可以将这多个条件放入到Map集合中,更加的方便


allEq(Map<R, V> params, boolean null2IsNull)
参数params:表示传递的Map集合
参数null2IsNull:表示对于为null的条件是否判断isNull

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // 属性值为 null 的查询,属性值不为 Null的不查询该字段
    @Test
    void allEq2() {

        HashMap<String, Object> hashMap = new HashMap<>();

        hashMap.put("name", "Tom");
        hashMap.put("age",18);
        //hashMap.put("age", null);  // 为null 的属性值,则会不查询

        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        //userQueryWrapper.allEq(hashMap,false); //  // 为null 的属性值,则会不查询
        userQueryWrapper.allEq(hashMap, true);  // 为null,(name = ? AND age IS NULL) 查询

        User user = userMapper.selectOne(userQueryWrapper);
        System.out.println(user);
    }
}

3.3 ne (不等于)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // 不等于数值的
    @Test
    void ne() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.ne(User::getName, "Tom");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);

    }
}

4. 范围查询

4.1 gt( > 大于的范围)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // > 查询
    @Test
    void gt() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        Integer age = 18;
        lambdaQueryWrapper.gt(User::getAge, age);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

4.2 ge(>= 大于等于的范围)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // >=查询
    @Test
    void ge() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        Integer age = 18;
        lambdaQueryWrapper.ge(User::getAge, age);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

4.3 lt(< 小于的范围)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;


    // <
    @Test
    void lt() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        Integer age = 20;
        lambdaQueryWrapper.lt(User::getAge, age);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

4.4 le(小于等于的范围)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // <=
    @Test
    void le() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        Integer age = 20;
        LambdaQueryWrapper<User> lambdaQueryWrapper1 = lambdaQueryWrapper.le(User::getAge, age);

        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

4.5 between(在该区间的范围)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // 范围之间
    @Test
    void between() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.between(User::getAge, 10, 20);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);

    }
}

4.6 notBetween(不在该区间的范围)

在这里插入图片描述

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // 不在范围的:  (age NOT BETWEEN ? AND ?)
    @Test
    void notBetween() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.notBetween(User::getAge,10,18);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

5. 模糊查询

5.1 like( %值%)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // 模糊查询: %J%(String)
    @Test
    void like() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.like(User::getName,"J");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

5.2 notLike(不满足 %值%)

在这里插入图片描述

5.3 likeLeft(%值)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;


@SpringBootTest  // 注意这个测试必须要有一个场景类才行,不然是无法运行的。测试的类不同的话,还需要指明
// 包
public class QueryTest {

    @Autowired
    private UserMapper userMapper;

    // 模糊查询:  %e(String) 左边
    @Test
    void likeft() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.likeLeft(User::getName,"e");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);

    }
}

5.4 likeRight(值%)

在这里插入图片描述

6. 判空查询

6.1 isNUll(判断是否为 Null )

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
   private UserMapper userMapper;

    // 判断是否为 null  WHERE (name IS NULL)
    @Test
    void isNUll3() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.isNull(User::getName);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

6.2 isNotNull

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
    private UserMapper userMapper;

    //  WHERE (name IS NULL)
    @Test
    void isNotNull() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.isNotNull(User::getName);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

7. 包含查询

7.1 in(包含该内容的字段)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
    private UserMapper userMapper;

    // 字段 = 值 or 字段 = 值 ->in
    // r WHERE (age IN (?,?,?))
    @Test
    void in() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        ArrayList<Object> arrayList = new ArrayList<>();
        Collections.addAll(arrayList, 18, 20, 22);
        lambdaQueryWrapper.in(User::getAge, arrayList);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);

    }
}

7.2 notIn(不包含该内容的字段)

在这里插入图片描述



import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
    private UserMapper userMapper;

    // 字段!=值 and 字段!=值 ->not in
    //  WHERE (age NOT IN (?,?,?))
    @Test
    void notIn() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        ArrayList<Integer> arrayList = new ArrayList<>();
        Collections.addAll(arrayList, 18, 20, 22);
        lambdaQueryWrapper.notIn(User::getAge, arrayList);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

7.3 inSql(包含该内容的字段)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
    private UserMapper userMapper;

    // er WHERE (age IN (18,20,22))
    @Test
    void inSql() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.inSql(User::getAge, "18,20,22");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

7.4 notInSql(不包含该内容的字段)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
    private UserMapper userMapper;

    // age NOT IN (18,20,22))
    @Test
    void notInsql() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.notInSql(User::getAge, "18,20,22");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

在这里插入图片描述



import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class QueryTest02 {
    @Resource
    private UserMapper userMapper;


    // RE (age NOT IN (select age from rainbowsea_user where age > 20))
    @Test
    void notInSql2() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.notInSql(User::getAge, "select age from rainbowsea_user where age > 20");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

8. 分组查询

8.1 groupBy(分组的字段)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    // select age,count(*) as field_count from rainbowsea_user group by age;
    // 分组查询
    @Test
    void groupBy() {
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        // 分组字段
        queryWrapper.groupBy("age");
        // 查询字段
        queryWrapper.select("age,count(*) as field_count");
        List<Map<String, Object>> maps = userMapper.selectMaps(queryWrapper);
        System.out.println(maps);
    }
}

9. 聚合查询

9.1 having(聚合的字段)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    // select age,count(*) as field_count from rainbowsea_user group by age HAVING field_count >=2;
    // 聚合查询
    @Test
    void having() {
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        // 查询字段
        userQueryWrapper.select("age,count(*) as field_count");
        // 聚合条件筛选
        userQueryWrapper.having("field_count = 1");
        List<Map<String, Object>> maps = userMapper.selectMaps(userQueryWrapper);
        System.out.println(maps);
    }
}

10. 排序查询

10.1 orderByAsc(升序)

在这里插入图片描述

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;



@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    // 降序
    @Test
    void orderByAsc() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.orderByAsc(User::getAge, User::getId);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

10.2 orderByDesc(降序)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;



@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    // 升序
    @Test
    void orderByDesc() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.orderByDesc(User::getAge, User::getId);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

10.3 orderBy(多字段排序定义)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;





@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    @Test
    void orderBy() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        // 设置排序字段和排序的方式
        // 参数1:如果排序字段的值为null的时候,是否还要作为排序字段参与排序
        // 参数2:是否升序排序,
        // 参数3: 排序字段
        //lambdaQueryWrapper.orderBy(true, true, User::getAge);
        lambdaQueryWrapper.orderBy(false, true, User::getAge);
        lambdaQueryWrapper.orderBy(true, false, User::getId);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

11. func 查询

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;



@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    //   // 可能会根据不同的请情况选择拼接不同的查询条件
    @Test
    void func() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();

        // 可能会根据不同的请情况选择拼接不同的查询条件
      /*  lambdaQueryWrapper.func(new Consumer<LambdaQueryWrapper<User>>() {
            @Override
            public void accept(LambdaQueryWrapper<User> userLambdaQueryWrapper) {
                //if (true) {
                if (false) {
                    userLambdaQueryWrapper.eq(User::getId,1);
                } else {
                    userLambdaQueryWrapper.ne(User::getId,1);
                }
            }
        });*/

        // 使用lambad表达式
        lambdaQueryWrapper.func(userLambdaQueryWrapper -> {
            if (false) {
                userLambdaQueryWrapper.eq(User::getId, 1);
            } else {
                userLambdaQueryWrapper.ne(User::getId, 1);
            }
        });
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

12. 逻辑查询

12.1 and(与)

在这里插入图片描述



import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;



@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    //  WHERE (age > ? AND age < ?)
    @Test
    void and() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.gt(User::getAge, 22).lt(User::getAge, 30);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;



@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;


    // WHERE (name = ? AND (age > ? OR age < ?))
    @Test
    void add2() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(User::getName, "wang").and(i -> i.gt(User::getAge, 26).or().lt(User::getAge, 22));
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

12.2 or(或)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    //  WHERE (age < ? AND age > ?)
    @Test
    void or() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.lt(User::getAge, 20).gt(User::getAge, 23);// age < 20 || age >=23
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

12.3 nested(非)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    //  WHERE ((name = ? AND age <> ?))
    @Test
    void nested() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.nested(i->i.eq(User::getName,"Tom").ne(User::getAge,22));
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

13. 自定义条件查询

13.1 apply(自定义查询条件)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    // 自定义条件查询
    @Test
    void apply() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.apply("id = 1");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

14. last 查询(在sql语句的最末尾拼接“字符串”)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;
    // 最后添加字符拼接
    // SELECT id,name,age,email,`desc` FROM rainbowsea_user limit 0,2
    @Test
    void last() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.last("limit 0,2");
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }

}

15. exists查询

15.1 exists(存在查询)

在这里插入图片描述


@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;

    // SELECT * from rainbowsea_user WHERE EXISTS (select id FROM rainbowsea_user WHERE age = 18);
    // SELECT * from rainbowsea_user WHERE EXISTS (select id FROM rainbowsea_user WHERE age = 10);

    @Test
    void exists() {
        // 1. 创建QueryWrapper对象
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        // 2. 构建查询条件
        //lambdaQueryWrapper.exists("select id FROM rainbowsea_user WHERE age = 18");
        lambdaQueryWrapper.exists("select id FROM rainbowsea_user WHERE age = 10");
        // 3.查询
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

15.2 notExists(不存在查询)

在这里插入图片描述


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;


    //  SELECT * from rainbowsea_user WHERE not EXISTS (select id FROM rainbowsea_user WHERE age = 10);
    @Test
    void notExists() {
        // 1. 创建QueryWrapper对象
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        // 2. 构建查询条件
        //lambdaQueryWrapper.exists("select id FROM rainbowsea_user WHERE age = 18");
        lambdaQueryWrapper.notExists("select id FROM rainbowsea_user WHERE age = 10");
        // 3.查询
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
}

16. 字段查询

16.1 select(字段查询)

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import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rainbowsea.bean.User;
import com.rainbowsea.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.awt.*;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

@SpringBootTest
public class QueryTest03 {

    @Autowired
    private UserMapper userMapper;


    @Test
    void select() {
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.select(User::getId,User::getName);
        List<User> users = userMapper.selectList(lambdaQueryWrapper);
        System.out.println(users);
    }
    
}

17. 最后:

“在这个最后的篇章中,我要表达我对每一位读者的感激之情。你们的关注和回复是我创作的动力源泉,我从你们身上吸取了无尽的灵感与勇气。我会将你们的鼓励留在心底,继续在其他的领域奋斗。感谢你们,我们总会在某个时刻再次相遇。”

在这里插入图片描述

posted @ 2024-09-26 19:09  Rainbow-Sea  阅读(116)  评论(0编辑  收藏  举报