springboot集成mybatisplus的方法

2024-07-13 10:17:40

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介绍：

Mybatis-Plus（简称MP）是一个 Mybatis 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。（摘自mybatis-plus官网）Mybatis虽然已经给我们提供了很大的方便，但它还是有不足之处，MP的存在就是为了稍稍弥补Mybatis的不足。在我们使用Mybatis时会发现，每当要写一个业务逻辑的时候都要在DAO层写一个方法，再对应一个SQL，即使是简单的条件查询、即使仅仅改变了一个条件都要在DAO层新增一个方法，针对这个问题，MP这样一个框架，一种集Mybatis与Hibernate的优点一起的框架。它提供了Hibernate的单表CURD操作的方便同时，又保留了Mybatis的特性。

本章只教大家怎么使用MybatisPlus，如果想深入了解底层是怎么实现的可以去官网下载源代码进行解读。

一、创建项目

　　这里就不一步一步来了，我直接给出创建后的项目结构，在本章的最后我会给出源码地址需要看效果的可以进行下载。

springboot,mybatisplus

二、引入依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.chaoqi</groupId> <artifactId>springboot_mybatisplus</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot_mybatisplus</name> <description>Demo project for Spring Boot</description> <parent>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-parent</artifactId>  <version>2.0.0.RELEASE</version>  <relativePath/> </parent> <properties>  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>  <java.version>1.8</java.version> </properties> <dependencies>  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-jdbc</artifactId>  </dependency>  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-web</artifactId>  </dependency>  <dependency>   <groupId>org.mybatis.spring.boot</groupId>   <artifactId>mybatis-spring-boot-starter</artifactId>   <version>1.3.2</version>  </dependency>  <dependency>   <groupId>mysql</groupId>   <artifactId>mysql-connector-java</artifactId>   <scope>runtime</scope>  </dependency>  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-test</artifactId>   <scope>test</scope>  </dependency>  <!--添加jsp依赖 -->  <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-tomcat</artifactId>  </dependency>  <dependency>   <groupId>org.apache.tomcat.embed</groupId>   <artifactId>tomcat-embed-jasper</artifactId>  </dependency>  <!-- SpringBoot - MyBatis 逆向工程 -->  <dependency>   <groupId>org.mybatis.generator</groupId>   <artifactId>mybatis-generator-core</artifactId>   <version>1.3.2</version>  </dependency>  <!-- MyBatis 通用 Mapper -->  <dependency>   <groupId>tk.mybatis</groupId>   <artifactId>mapper-spring-boot-starter</artifactId>   <version>1.1.4</version>  </dependency> </dependencies> <build>  <plugins>   <plugin>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-maven-plugin</artifactId>   </plugin>   <plugin>    <groupId>org.mybatis.generator</groupId>    <artifactId>mybatis-generator-maven-plugin</artifactId>    <version>1.3.2</version>    <configuration>     <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>     <verbose>true</verbose>     <overwrite>true</overwrite>    </configuration>    <executions>     <execution>      <id>Generate MyBatis Artifacts</id>      <goals>       <goal>generate</goal>      </goals>     </execution>    </executions>    <dependencies>     <dependency>      <groupId>org.mybatis.generator</groupId>      <artifactId>mybatis-generator-core</artifactId>      <version>1.3.2</version>     </dependency>     <dependency>      <groupId>tk.mybatis</groupId>      <artifactId>mapper</artifactId>      <version>3.5.0</version>     </dependency>    </dependencies>   </plugin>  </plugins> </build></project>

三、编辑application.yml

server: port: 8080spring: mvc: view:  prefix: /WEB-INF/jsp/  suffix: .jsp datasource: url: jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8&useUnicode=true&useSSL=false username: root password: 123456 driver-class-name: com.mysql.jdbc.Drivermybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.chaoqi.springboot_mybatisplus.domain

四、逆向生成pojo，mapper

创建generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE generatorConfiguration  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration> <properties resource="application.yml"/> <classPathEntry location="D:/mysql/mysql-connector-java-5.1.46/mysql-connector-java-5.1.46.jar"/> <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">  <property name="beginningDelimiter" value="`"/>  <property name="endingDelimiter" value="`"/>  <property name="javaFileEncoding" value="UTF-8"/>  <plugin type="tk.mybatis.mapper.generator.MapperPlugin">   <property name="mappers" value="tk.mybatis.mapper.common.Mapper"/>  </plugin>  <!-- 注释 -->  <commentGenerator>   <!-- 是否生成注释代时间戳 -->   <property name="suppressDate" value="true"/>   <!-- 是否去除自动生成的注释 true：是 ： false:否 -->   <property name="suppressAllComments" value="false"/>  </commentGenerator>  <!-- JDBC连接 -->  <jdbcConnection    driverClass="com.mysql.jdbc.Driver"    connectionURL="jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8"    userId="root"    password="123456">  </jdbcConnection>  <!-- 生成实体类地址 -->  <javaModelGenerator targetPackage="com.chaoqi.springboot_mybatisplus.dao.domain" targetProject="src/main/java"/>  <!-- 生成mapper xml文件 -->  <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>  <!-- 生成mapper xml对应Client-->  <javaClientGenerator targetPackage="com.chaoqi.springboot_mybatisplus.dao.mapper" targetProject="src/main/java"        type="XMLMAPPER"/>  <!-- 配置表信息 -->  <table tableName="%">   <!--mysql 配置-->   <generatedKey column="id" sqlStatement="Mysql"/>   <!--oracle 配置-->   <!--<generatedKey column="id" sqlStatement="select SEQ_{1}.nextval from dual" identity="false" type="pre"/>-->  </table> </context></generatorConfiguration>

maven运行generator

springboot,mybatisplus

生成完后的项目结构如下

springboot,mybatisplus

五、整合mybatisplus

创建service接口以及service实现类

package com.chaoqi.springboot_mybatisplus.service;import com.chaoqi.springboot_mybatisplus.dao.domain.MusicInfo;import java.util.List;public interface MusicInfoService { public List<MusicInfo> getMusicInfo();}

package com.chaoqi.springboot_mybatisplus.service.impl;import com.chaoqi.springboot_mybatisplus.dao.domain.MusicInfo;import com.chaoqi.springboot_mybatisplus.dao.mapper.MusicInfoMapper;import com.chaoqi.springboot_mybatisplus.service.MusicInfoService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class MusicInfoServiceImpl implements MusicInfoService { @Autowired private MusicInfoMapper musicInfoMapper; @Override public List<MusicInfo> getMusicInfo() {  List<MusicInfo> musicInfos = musicInfoMapper.selectAll();  return musicInfos; }}

创建Controller

package com.chaoqi.springboot_mybatisplus.web;import com.chaoqi.springboot_mybatisplus.dao.domain.MusicInfo;import com.chaoqi.springboot_mybatisplus.service.MusicInfoService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController@RequestMapping(value = "/music")public class MusicInfoController { @Autowired private MusicInfoService musicInfoService; @RequestMapping("/showMusic") public List<MusicInfo> getMusicInfo() {  List<MusicInfo> musicInfo1 = musicInfoService.getMusicInfo();  return musicInfo1; }}

这里我的mapper并不要写sql，一些简单的sqlmybatiplus都给封装好了，节省了许多开发时间，如果是一些复杂的sql，也可以通过写原生sql来实现，在我的第二篇博客中有讲到springboot+springmvc+mybatis项目整合

运行SpringbootMybatisplusApplication主函数

package com.chaoqi.springboot_mybatisplus;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@MapperScan("com.chaoqi.springboot_mybatisplus.dao.mapper")public class SpringbootMybatisplusApplication { public static void main(String[] args) {  SpringApplication.run(SpringbootMybatisplusApplication.class, args); }}

查看数据库

springboot,mybatisplus