Mybatis-Plus学习笔记

短命女 2023-10-06 21:24 6阅读 0赞

## 一、MyBatis-Plus简介 ##

MyBatis-Plus (opens new window)（简称 MP）是一个 MyBatis (opens new window)的增强工具，在 MyBatis 的基础上只做增强不做改变，为简化开发、提高效率而生。

[MyBatis-Plus 3.x 文档手册][MyBatis-Plus 3.x]

## 二、前置知识 ##

Mybatis  
Spring  
Maven

## 三、继承mp ##

### 3.1、创建测试数据库和需要的数据表 ###

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16]  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 1]  
![在这里插入图片描述][59ef12d5205346599c2302859225b6f4.png]

### 3.2、创建JavaBean ###

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_13_color_FFFFFF_t_70_g_se_x_16]

### 3.3、依赖添加pom.xml ###

<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>
      <groupId>com.atguigu.mp</groupId>
      <artifactId>mp01</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      
      <dependencies>
      	
    	<dependency>
    	    <groupId>com.baomidou</groupId>
    	    <artifactId>mybatis-plus-boot-starter</artifactId>
    	    <version>3.4.2</version>
    	</dependency>
    	
    	
    	<dependency>
    	    <groupId>junit</groupId>
    	    <artifactId>junit</artifactId>
    	    <version>4.12</version>
    	    <scope>test</scope>
    	</dependency>
    	
    	
    	<dependency>
    	    <groupId>log4j</groupId>
    	    <artifactId>log4j</artifactId>
    	    <version>1.2.17</version>
    	</dependency>
    	
      	
    	<dependency>
    	    <groupId>com.mchange</groupId>
    	    <artifactId>c3p0</artifactId>
    	    <version>0.9.5.2</version>
    	</dependency>
      	
      	
    	<dependency>
    	    <groupId>mysql</groupId>
    	    <artifactId>mysql-connector-java</artifactId>
    	    <version>8.0.26</version>
    	</dependency>
      	
      	
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-context</artifactId>
    	    <version>5.3.6</version>
    	</dependency>
    	
    	
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-orm</artifactId>
    	    <version>5.3.14</version>
    	</dependency>
      </dependencies>
      
    </project>

### 3.4、依赖配置 ###

![在这里插入图片描述][341a793bdf284494a5e07f8002ee3029.png]  
applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    
    	
    	<context:property-placeholder location="classpath:db.properties"/>
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="driverClass" value="${jdbc.driver}"></property>
    		<property name="jdbcUrl" value="${jdbc.url}"></property>
    		<property name="user" value="${jdbc.username}"></property>
    		<property name="password" value="${jdbc.password}"></property>
    	</bean>
    	
    	
    	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    		
    		<property name="dataSource" ref="dataSource"></property>
    	</bean>
    	
    	
    	<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>
    	
    	
    	
    	<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean" >
    		
    		<property name="configLocation" value="classpath:mybatis-config.xml"></property>
    		
    		<property name="dataSource" ref="dataSource"></property>
    		
    		<property name="typeAliasesPackage" value="com.atguigu.mp.beans"></property>
    	</bean>
    	
    	
    	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    		<property name="basePackage" value="com.atguigu.mp.mapper"></property>
    	</bean>
    	
    </beans>

db.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/mp?serverTimezone=Hongkong
    jdbc.username=root
    jdbc.password=75688

log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
     
    <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
     
     <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
       <param name="Encoding" value="UTF-8" />
       <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" />
       </layout>
     </appender>
     <logger name="java.sql">
       <level value="debug" />
     </logger>
     <logger name="org.apache.ibatis">
       <level value="info" />
     </logger>
     <root>
       <level value="debug" />
       <appender-ref ref="STDOUT" />
     </root>
    </log4j:configuration>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE configuration
     PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
     "http://mybatis.org/dtd/mybatis-3-config.dtd">
     
    <configuration>
    	
    </configuration>

### 3.5、测试 ###

![在这里插入图片描述][dc7b2524db7c4531a8e7805b66813138.png]

package com.atguigu.mp.test;
    
    import static org.junit.Assert.*;
    
    import java.sql.Connection;
    import java.sql.SQLException;
    
    import javax.sql.DataSource;
    
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class TestMP {
        
    
    	private ApplicationContext ios = new ClassPathXmlApplicationContext("applicationContext.xml");
    	
    	@Test
    	public void testDataSource() throws Exception {
        
    		DataSource ds = ios.getBean("dataSource",DataSource.class);
    		System.out.println("ds == "+ds);
    		
    		Connection connection = ds.getConnection();
    		System.out.println("connection == "+connection);
    		
    	}
    
    }

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 2]  
测试成功

### 3.5、集成Mybatis-Plus ###

com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 3]  
再次运行测试时会输出一下提示  
![在这里插入图片描述][e1fd7111df9b46478dcc7f68fbf30217.png]

## 四、入门HelloWorld ##

4.1 通用CRUDl  
1）提出问题:  
假设我们已存在一张tbl\_emplovee表，且已有对应的实体类 Employee ，实现tbl\_employee表的CRUD 操作找们需要做什么呢?。  
2）实现方式:  
基于 Mybatis  
需要编写EmployeeMapper接口,并手动编写CRUD方法  
提供 EmployeeMapper.xml映射文件,并手动编写每个方法对应的sQL 语句.  
基于MP  
只需要创建EmploveeMapper接口,并继承BaseMapper,接口.这就是使用MPv需要完成的所有操作,甚至不需要创建SQL映射文件。

### 4.1、BaseMapper接口 ###

![在这里插入图片描述][c8255004d9344b32811f8d5e494a8244.png]  
EmployeeMapper.java

package com.atguigu.mp.mapper;
    
    import com.atguigu.mp.beans.Employee;
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    
    /*
     * Mapper接口
     * 
     * 基于Mybatis:	在Mapper接口中编写CRUD相关的方法提供Mapper接口所对应的SQL映射文件,以及方法对应的SQL语句。
     * 
     * 基于MP:		让XxxMapper接口继承BaseMapper接口即可。
     * 				BaseMapper<T>︰泛型指定的就是当前Mapper接口所操作的实体类类型
     * 
     */
    
    public interface EmployeeMapper extends BaseMapper<Employee>{
        
    
    }

### 4.2、插入操作 ###

#### 4.2.1、通用插入操作（@TableName，@TableId） ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 4]  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 5]  
运行测试，后数据库更新数据如下：  
![在这里插入图片描述][2d2186d3b7bb4ea593095f6053f1a10e.png]

#### 4.2.2、通用插入操作（通过application.cml配置代替@TableName，@TableId，实现同意设置） ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 6]  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 7]

#### 4.2.3、bean上使用@TableField和@TableField注解 ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 8]

#### 4.2.4、插入数据获取主键值 ####

mybatisplus执行插入后会自动返回主键值  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 9]  
如果是mabatis的话需要用一下方式操作  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 10]

### 4.3、更新操作 ###

#### 4.3.1、通用更新操作——update ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 11]  
![在这里插入图片描述][6e7686c200644549b47bdc418418b053.png]  
![在这里插入图片描述][8deaff99f8384fa48ef7d4e0a95cc562.png]

### 4.4、查询操作 ###

/*
    	 * 通用查询方法
    	 */
    	@Test
    	public void testCommonSelect(){
        
    		//1、通过id查询selectById
    		Employee employee1 = employeeMapper.selectById(3);
    		System.out.println("selectById == "+employee1);
    		
    //		//2、通过多个字段查询selectById
    //		Employee employee2 = new Employee();
    //		employee2.setLastName("Tony");
    //		employee2.setAge(23);
    //		
    //		
    //		Employee res = employeeMapper.selectOne(employee2);
    //		System.out.println("selectOne == "+res);
    		
    		//3、通过多个id查询
    		List<Integer> idList = new ArrayList<>();
    		idList.add(1);
    		idList.add(2);
    		idList.add(3);
    		
    		List<Employee> employee3 = employeeMapper.selectBatchIds(idList);
    		System.out.println("selectBatchIds == "+employee3);
    		
    		//4、通过Map查询
    		Map<String, Object> columnMap = new HashMap<String, Object>();
    		columnMap.put("last_name", "Tom");//key写的是数据库的列名，不是对象的属性名
    		columnMap.put("gender", "1");
    		
    		List<Employee> employee4 = employeeMapper.selectByMap(columnMap);
    		System.out.println("selectByMap == "+employee4);
    		
    		//5、通过selectPage查询
    //		List<Employee> employee5 = (List<Employee>) employeeMapper.selectPage(new Page<>(1, 2), null);
    //		System.out.println("selectByMap == "+employee4);
    		
    		
    	}

### 4.5、删除操作 ###

/*
    	 * 通用删除方法
    	 */
    	@Test
    	public void testCommonDelete(){
        
    		//通过deleteById删除一条数据
    		Integer deleteById = employeeMapper.deleteById(3);
    		System.out.println("deleteById == "+deleteById);
    		
    		//通过deleteByMap根据条件删除数据
    		Map<String, Object> columnMap = new HashMap<String, Object>();
    		columnMap.put("last_name", "MP");//key写的是数据库的列名，不是对象的属性名
    		columnMap.put("gender", "1");
    		Integer deleteByMap = employeeMapper.deleteByMap(columnMap);
    		System.out.println("deleteByMap == "+deleteByMap);
    		
    		//通过deleteBatchIds根据多个id删除数据
    		List<Integer> idList = new ArrayList<>();
    		idList.add(8);
    		idList.add(9);
    		
    		int deleteBatchIds = employeeMapper.deleteBatchIds(idList);
    		System.out.println("deleteBatchIds == "+deleteBatchIds);
    	}

## 五、条件构造器 ##

### 5.1、QueryWrapper ###

#### 5.1.1、QueryWrapper带条件查询操作selectList ####

![在这里插入图片描述][df4244662b53436fb741588bb2ad5088.png]  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 12]  
![在这里插入图片描述][11c34642f0ce4279a1b1b94a268a7f51.png]

#### 5.1.2、QueryWrapper带条件更新操作update ####

![在这里插入图片描述][74583c1c10294a7f908724454a16d3c4.png]

#### 5.1.3、QueryWrapper带条件更新操作delete ####

![在这里插入图片描述][936fc5993f2f4b699ec877e57962047a.png]

## 六、ActiveRecord(活动记录) ##

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 13]

### 6.1、AR插入操作 ###

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 14]

### 6.2、AR更新操作 ###

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 15]

### 6.3、AR查询操作 ###

#### 6.3.1、AR查询操作selectById ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 16]

#### 6.3.2、AR查询操作selectAll ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 17]

#### 6.3.3、AR查询操作selectList ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 18]

#### 6.3.4、AR查询操作selectCount ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 19]

### 6.4、AR删除操作 ###

#### 6.4.1、AR删除操作deleteById ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 20]

#### 6.4.2、AR删除操作delete ####

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 21]

### 6.5、AR分页复杂操作 ###

![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 22]

## 七、代码生成器 ##

![在这里插入图片描述][02429db008234740a45ea88218cca1cd.png]  
![在这里插入图片描述][122c4d0a47ad4e8c83b19e47d2d9f322.png]

### 安装依赖 ###

[MyBatis-Plus 3.x]: https://www.bookstack.cn/read/mybatis-plus-3.x/spilt.4.09e8fb6c9a564182.md
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/4052875ca39f4e2381279ac82a152b45.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5rGf5bee55uK5b2k,size_20,color_FFFFFF,t_70,g_se,x_16
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[59ef12d5205346599c2302859225b6f4.png]: https://img-blog.csdnimg.cn/59ef12d5205346599c2302859225b6f4.png
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[341a793bdf284494a5e07f8002ee3029.png]: https://img-blog.csdnimg.cn/341a793bdf284494a5e07f8002ee3029.png
[dc7b2524db7c4531a8e7805b66813138.png]: https://img-blog.csdnimg.cn/dc7b2524db7c4531a8e7805b66813138.png
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA5rGf5bee55uK5b2k_size_20_color_FFFFFF_t_70_g_se_x_16 2]: https://img-blog.csdnimg.cn/6a19197202204f418352111f60e3fd4c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5rGf5bee55uK5b2k,size_20,color_FFFFFF,t_70,g_se,x_16
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