Spring Boot集成MybatisPlus实现通用代码生成

1.背景介绍

相信很多朋友在项目中使用的ORM框架都是MyBatis，如果单用MyBatis来操作数据库的话，需要手写很多单表查询的SQL实现。这时候我们往往会选择一个增强工具来实现这些单表CRUD操作，这里推荐一款好用的工具MyBatis-Plus！

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。MyBatis-Plus 提供了代码生成器，可以一键生成controller、service、mapper、model、mapper.xml代码，同时提供了丰富的CRUD操作方法，助我们解放双手！

2.mysql环境准备

mysql setup

docker run --name docker-mysql-5.7 -e MYSQL_ROOT_PASSWORD=123456 -p 3306:3306 -d mysql:5.7

init data

create database demo;
create table user_info
(
user_id     varchar(64)          not null primary key,
username    varchar(100)         null ,
age         int(3)               null ,
gender      tinyint(1)           null ,
remark      varchar(255)         null ,
create_time datetime             null ,
create_id   varchar(64)          null ,
update_time datetime             null ,
update_id   varchar(64)          null ,
enabled     tinyint(1) default 1 null
);
INSERT INTO demo.user_info
(user_id, username, age, gender, remark, create_time, create_id, update_time, update_id, enabled)
VALUES('1', '1', 1, 1, '1', NULL, '1', NULL, NULL, 1);

remark

msyql username：root
mysql password：123456

3.代码工程

实验目标：基于mysql自动生成crud代码

pom.xml

<?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">
    <parent>
        <artifactId>springboot-demo</artifactId>
        <groupId>com.et</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>generator</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <!-- spring boot -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
        </dependency>
    </dependencies>
</project>

工具生成类

package com.et.generator;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.util.ArrayList;
import java.util.List;

public class Generator {
   
   public static void main(String[] args) {
      // System.getProperty("user.dir") == get current project dir
      String projectDir ="D:\\IdeaProjects\\ETFramework\\generator";
      String outputDir = projectDir+"\\src\\main\\java";
      //String outputDir = System.getProperty("user.dir") + "/src/main/java";
//    String outputDir = "C://Users/VULCAN/Desktop/new";
      // table name, Pay attention to capitalization
      String[] tableNames = new String[]{"user_info"};
      // database url
      String url = "jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf8";
      String userName = "root";
      String password = "123456";
      // parentPackage
      String parentPackage = "com.et.generator";
      // need to remove prefix from tablename
      String prefixTable = "";
      generate(projectDir,outputDir, tableNames, url, userName, password, parentPackage, prefixTable);
   }
   
   /**
    * @param outputDir
    * @param tableNames
    * @param url
    * @param userName
    * @param password
    * @param parentPackage
    * @param prefixTable
    */
   public static void generate(String projectDir,String outputDir, String[] tableNames, String url, String userName,
         String password, String parentPackage, String prefixTable) {
      // ===============  Global setting ==================
      GlobalConfig gc = new GlobalConfig();
      gc.setOutputDir(outputDir)
         .setActiveRecord(true)                      //  enable AR,
           .setAuthor("Harries")                    // set Author name
           .setFileOverride(true)                          // enable FileOverride？
           .setIdType(IdType.AUTO)                         //primary strategy
           .setBaseResultMap(true)                      // SQL mappingg
           .setBaseColumnList(true)                     // SQL BaseColumn
           .setServiceName("%sService")                  // service name
           .setOpen(false);
      
      // =================  database setting   ===============
      DataSourceConfig dsc = new DataSourceConfig();
         dsc.setDbType(DbType.MYSQL)
          .setDriverName("com.mysql.cj.jdbc.Driver");
      dsc.setUrl(url)
           .setUsername(userName)
           .setPassword(password);
      
      // =================  package setting  ===================
       PackageConfig pc = new PackageConfig();
         pc.setParent(parentPackage)                     // parentPackage path
//           .setModuleName("base")                         // ModuleName path
           .setMapper("mapper")
           .setEntity("entity")
//           .setEntity("entity")
           .setService("service")
           //.setServiceImpl("service.impl");              // auto generate impl， no need to set
           .setController("controller");
         
       // ==================  custom setting  =================
         InjectionConfig cfg = new InjectionConfig() {
             @Override
             public void initMap() {
                 // to do nothing
             }
         };
         List<FileOutConfig> focList = new ArrayList<>();
         // adjust xml generate directory
         focList.add(new FileOutConfig("/templates/mapper.xml.ftl") {
             @Override
             public String outputFile(TableInfo tableInfo) {
                 // custom file name
                 return projectDir + "/src/main/resources/mybatis/"
                         + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
             }
         });
         cfg.setFileOutConfigList(focList);
         
         // ===================  strategy setting  ==================
         StrategyConfig strategy = new StrategyConfig();
         strategy.setNaming(NamingStrategy.underline_to_camel)             // table name：  underline_to_camel
                 .setColumnNaming(NamingStrategy.underline_to_camel)         // file name： underline_to_camel
                 .setInclude(tableNames)                              // tableNames
                 .setCapitalMode(true)                               // enable CapitalMod(ORACLE )
                 .setTablePrefix(prefixTable)                          // remove table prefix
//                 .setFieldPrefix(pc.getModuleName() + "_")               // remove fields prefix
//                 .setSuperEntityClass("com.maoxs.pojo")                 // Entity implement
//                 .setSuperControllerClass("com.maoxs.controller")             // Controller implement
//                 .setSuperEntityColumns("id")                         // Super Columns
//                 .setEntityLombokModel(true)                         // enable lombok
                 .setControllerMappingHyphenStyle(true);                  // controller MappingHyphenStyle
       
         // ==================  custome template setting：default mybatis-plus/src/main/resources/templates  ======================
         //default: src/main/resources/templates directory
         TemplateConfig tc = new TemplateConfig();
         tc.setXml(null)                                            // xml template
           .setEntity("/templates/entity.java")                           // entity template
           .setMapper("/templates/mapper.java")                           // mapper template
           .setController("/templates/controller.java")                 // service template
           .setService("/templates/service.java")                    // serviceImpl template
           .setServiceImpl("/templates/serviceImpl.java");             // controller template
         
         // ====================  gen setting  ===================
         AutoGenerator mpg = new AutoGenerator();
         mpg.setCfg(cfg)
                 .setTemplate(tc)
                 .setGlobalConfig(gc)
                 .setDataSource(dsc)
                 .setPackageInfo(pc)
                 .setStrategy(strategy)
                 .setTemplateEngine(new FreemarkerTemplateEngine());          // choose freemarker engine，pay attention to pom dependency！
         mpg.execute();
   }

}

模版文件

模版文件太多，这里就不贴出来来了，你可以在resource文件夹下查看具体内容

DemoApplication

package com.et.generator;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.et.generator.mapper")
public class DemoApplication {

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

}

application.yaml

server:
  port: 8088

spring:
  datasource:
    password: 123456
    username: root
    url: jdbc:mysql://localhost:3306/demo?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true
    driver-class-name: com.mysql.cj.jdbc.Driver

mybatis-plus:
  mapper-locations: classpath*:/mybatis/*.xml

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

• GitHub - Harries/springboot-demo: a simple springboot demo with some components for example: redis,solr,rockmq and so on.

4.测试

生成

修改Generator类里面的一些生成参数，然后运行main方法生成对应的代码，效果如下

测试生成代码是否正确

启动Sring Boot应用，访问地址http://127.0.0.1:8088/userInfo/findAllUserInfo，返回结果如下：

[{"userId":"1","username":"1","age":1,"gender":true,"remark":"1","createTime":null,"createId":"1","updateTime":null,"updateId":null,"enabled":true},{"userId":"2","username":"2","age":2,"gender":true,"remark":"2","createTime":null,"createId":"2","updateTime":null,"updateId":null,"enabled":true}]

5.参考引用

• https://www.cnblogs.com/chenyanbin/p/13702283.html
• Spring Boot集成MybatisPlus实现通用代码生成 | Harries Blog™