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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。

搭建一个简单的MP-demo

1.配置pom.xml

 <dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- mybatis的orm插件 --><dependency><groupId>com.baomidou</groupId><artifactId>mybatisplus-spring-boot-starter</artifactId><version>1.0.4</version></dependency><!-- mybatis plus --><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus</artifactId><version>2.0.7</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-core</artifactId><version>3.1.0</version><scope>test</scope></dependency><!-- https://mvnrepository.com/artifact/org.apache.velocity/velocity --><dependency><groupId>org.apache.velocity</groupId><artifactId>velocity</artifactId><version>1.7</version></dependency><!-- https://mvnrepository.com/artifact/org.freemarker/freemarker --><dependency><groupId>org.freemarker</groupId><artifactId>freemarker</artifactId><version>2.3.28</version></dependency><!--数据库连接jdbc依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><!--mysql链接依赖--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--阿里druid数据库链接依赖--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.9</version></dependency><!-- https://mvnrepository.com/artifact/org.projectlombok/lombok --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>0.10.1</version><scope>provided</scope></dependency></dependencies>

2.创建一个包config，再建两个class文件

DataSourceConfig.java

package com.demo.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 org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
/*** 数据源配置*/
@Configuration
public class DataSourceConfig {@Bean(name = "dataSource")@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource() {return new DruidDataSource();}// 配置事物管理器@Bean(name = "transactionManager")public DataSourceTransactionManager transactionManager() {return new DataSourceTransactionManager(dataSource());}}

配置MybatisPlusConfig.Java

package com.demo.config;import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.plugins.PerformanceInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;@Configuration
//扫描dao或者是Mapper接口
@MapperScan("com.demo.mapper*")
public class MybatisPlusConfig {/*** mybatis-plus 分页插件*/@Beanpublic PaginationInterceptor paginationInterceptor() {PaginationInterceptor page = new PaginationInterceptor();page.setDialectType("mysql");return page;}/*** SQL执行效率插件* 性能分析拦截器，用于输出每条 SQL 语句及其执行时间*/@Bean@Profile({"dev", "pro"})// 设置 dev pro 环境开启public PerformanceInterceptor performanceInterceptor() {return new PerformanceInterceptor();}}

3.配置环境

application.properties

#默认启用开发环境配置
spring.profiles.active=dev
#启用生产环境配置
#spring.profiles.active=pro

application-dev.properties

server.port=666
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/eth
spring.datasource.username=root
spring.datasource.password=228197
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5
mybatis-plus.mapper-locations=classpath:/mapper/*Mapper.xml
mybatis-plus.typeAliasesPackage=com.cn.restyle.entity

application-pro.properties

server.port=666
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/eth
spring.datasource.username=root
spring.datasource.password=228197
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5
mybatis-plus.mapper-locations=classpath:/mapper/*Mapper.xml
mybatis-plus.typeAliasesPackage=com.cn.restyle.entity

4.在test目录下创建MpGenerator.Java，会在D盘下生成一个com的文件，将里面的entity，mapper，service，serviceimpl，controller，mapper.xml分别拷入工程对应的包内

package com.demo;import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.converts.MySqlTypeConvert;
import com.baomidou.mybatisplus.generator.config.rules.DbColumnType;
import com.baomidou.mybatisplus.generator.config.rules.DbType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** <p>* 代码生成器演示* </p>*/
public class MpGenerator {final static String dirPath = "D://";/*** <p>* MySQL 生成演示* </p>*/public static void main(String[] args) {AutoGenerator mpg = new AutoGenerator();// 选择 freemarker 引擎，默认 Veloctiy//mpg.setTemplateEngine(new FreemarkerTemplateEngine());// 全局配置GlobalConfig gc = new GlobalConfig();gc.setOutputDir(dirPath);gc.setAuthor("jiangluo");gc.setFileOverride(true); //是否覆盖gc.setActiveRecord(true);// 不需要ActiveRecord特性的请改为falsegc.setEnableCache(false);// XML 二级缓存gc.setBaseResultMap(true);// XML ResultMapgc.setBaseColumnList(true);// XML columList// 自定义文件命名，注意 %s 会自动填充表实体属性！// gc.setMapperName("%sDao");// gc.setXmlName("%sMapper");// gc.setServiceName("MP%sService");// gc.setServiceImplName("%sServiceDiy");// gc.setControllerName("%sAction");mpg.setGlobalConfig(gc);// 数据源配置DataSourceConfig dsc = new DataSourceConfig();dsc.setDbType(DbType.MYSQL);dsc.setTypeConvert(new MySqlTypeConvert() {// 自定义数据库表字段类型转换【可选】@Overridepublic DbColumnType processTypeConvert(String fieldType) {System.out.println("转换类型：" + fieldType);// 注意！！processTypeConvert 存在默认类型转换，如果不是你要的效果请自定义返回、非如下直接返回。return super.processTypeConvert(fieldType);}});dsc.setDriverName("com.mysql.jdbc.Driver");dsc.setUsername("root");dsc.setPassword("228197");dsc.setUrl("jdbc:mysql://127.0.0.1:3306/eth?characterEncoding=utf8");mpg.setDataSource(dsc);// 策略配置StrategyConfig strategy = new StrategyConfig();// strategy.setCapitalMode(true);// 全局大写命名 ORACLE 注意strategy.setTablePrefix(new String[]{"tb_", "tsys_"});// 此处可以修改为您的表前缀strategy.setNaming(NamingStrategy.underline_to_camel);// 表名生成策略// strategy.setInclude(new String[] { "user" }); // 需要生成的表// strategy.setExclude(new String[]{"test"}); // 排除生成的表// 自定义实体父类// strategy.setSuperEntityClass("com.baomidou.demo.TestEntity");// 自定义实体，公共字段// strategy.setSuperEntityColumns(new String[] { "test_id", "age" });// 自定义 mapper 父类// strategy.setSuperMapperClass("com.baomidou.demo.TestMapper");// 自定义 service 父类// strategy.setSuperServiceClass("com.baomidou.demo.TestService");// 自定义 service 实现类父类// strategy.setSuperServiceImplClass("com.baomidou.demo.TestServiceImpl");// 自定义 controller 父类// strategy.setSuperControllerClass("com.baomidou.demo.TestController");// 【实体】是否生成字段常量（默认 false）// public static final String ID = "test_id";// strategy.setEntityColumnConstant(true);// 【实体】是否为构建者模型（默认 false）// public User setName(String name) {this.name = name; return this;}strategy.setEntityBuilderModel(true);mpg.setStrategy(strategy);// 包配置PackageConfig pc = new PackageConfig();pc.setParent("com");pc.setModuleName("demo");pc.setController("controler");pc.setEntity("entity");pc.setMapper("mapper");pc.setService("service");pc.setServiceImpl("serviceImpl");pc.setXml("mapperXml");mpg.setPackageInfo(pc);// 注入自定义配置，可以在 VM 中使用 cfg.abc 【可无】InjectionConfig cfg = new InjectionConfig() {@Overridepublic void initMap() {Map<String, Object> map = new HashMap<String, Object>();map.put("abc", this.getConfig().getGlobalConfig().getAuthor() + "-mp");this.setMap(map);}};// 自定义 xxList.jsp 生成List<FileOutConfig> focList = new ArrayList<FileOutConfig>();
/*        focList.add(new FileOutConfig("/template/list.jsp.vm") {@Overridepublic String outputFile(TableInfo tableInfo) {// 自定义输入文件名称return "D://my_" + tableInfo.getEntityName() + ".jsp";}});cfg.setFileOutConfigList(focList);mpg.setCfg(cfg);*/// 调整 xml 生成目录演示
/*        focList.add(new FileOutConfig("/templates/mapper.xml.vm") {@Overridepublic String outputFile(TableInfo tableInfo) {return dirPath + tableInfo.getEntityName() + "Mapper.xml";}});cfg.setFileOutConfigList(focList);*/mpg.setCfg(cfg);// 关闭默认 xml 生成，调整生成 至 根目录
/*        TemplateConfig tc = new TemplateConfig();tc.setXml(null);mpg.setTemplate(tc);*/// 自定义模板配置，可以 copy 源码 mybatis-plus/src/main/resources/templates 下面内容修改，// 放置自己项目的 src/main/resources/templates 目录下, 默认名称一下可以不配置，也可以自定义模板名称// TemplateConfig tc = new TemplateConfig();// tc.setController("...");// tc.setEntity("...");// tc.setMapper("...");// tc.setXml("...");// tc.setService("...");// tc.setServiceImpl("...");// 如上任何一个模块如果设置 空 OR Null 将不生成该模块。// mpg.setTemplate(tc);// 执行生成mpg.execute();// 打印注入设置【可无】System.err.println(mpg.getCfg().getMap().get("abc"));}}

5.在test目录下建立一个测试类MPTest.java

package com.demo;import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.demo.entity.Student;
import com.demo.mapper.StudentMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;@RunWith(SpringRunner.class)
@MapperScan("com.demo.mapper")
@SpringBootTest
public class MPTest {@Resourceprivate StudentMapper studentMapper;@Testpublic void insertTest() {Student student = new Student();student.setId(1212);student.setStuName("蒋罗2");student.setStuNumber("134513");student.setAge(26);Integer inset1 = studentMapper.insert(student);System.out.println(student.getId());}@Testpublic void updateTest() {Student student = new Student();student.setId(1212);student.setStuName("蒋罗2222");Integer update1 = studentMapper.updateById(student);System.out.println(update1);}@Testpublic void selectTest() {Student student = studentMapper.selectById(1001);System.out.println(student.getStuName());}@Testpublic void deleteTest() {Integer delete1 = studentMapper.deleteById(1212);System.out.println(delete1);}@Testpublic void testWrapper() {/*  EntityWrapper<Student> qureyWrapper = new EntityWrapper<>();qureyWrapper.eq("id", "1001");System.out.println(qureyWrapper);*/QueryWrapper<Student> queryWrapper = new QueryWrapper<>();queryWrapper.eq("id", "1002");System.out.println(queryWrapper.getSqlSegment());}
}

The END!