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MyBatis Plus中代碼生成器使用詳解

更新時(shí)間：2020年08月26日 10:16:41 作者：wshanshi

這篇文章主要介紹了MyBatis Plus中代碼生成器使用詳解，文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

按照官網(wǎng)上實(shí)例嘗試了一下，感覺MyBatis plus中代碼生成器還是很強(qiáng)大的，以下是測試的總結(jié)：

使用MybatisPlus的主要依賴

引入plus依賴（苞米豆）

<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-boot-starter</artifactId>
  <version>3.1.1</version>
  </dependency>

生成器依賴

<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-generator</artifactId>
  <version>3.1.1</version>
 </dependency>

模板依賴

<dependency>
  <groupId>org.freemarker</groupId>
  <artifactId>freemarker</artifactId>
  <version>2.3.28</version>
 </dependency>

測試的pom依賴（也有我測試別東西的依賴，多余的請(qǐng)忽略）

<?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>
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.1.5.RELEASE</version>
 <relativePath/> <!-- lookup parent from repository -->
 </parent>
 <groupId>com.wy</groupId>
 <artifactId>testpuls</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <name>testpuls</name>
 <description>Demo project for Spring Boot</description>

 <properties>
 <java.version>1.8</java.version>
 </properties>

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

 <dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <scope>runtime</scope>
 </dependency>
 <dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <optional>true</optional>
 </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>
  <version>2.3.28</version>
 </dependency>
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
 </dependency>
 <dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.12</version>
  <scope>test</scope>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>5.1.7.RELEASE</version>
  <scope>compile</scope>
 </dependency>
 <dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
 </dependency>
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-test</artifactId>
 </dependency>
 <dependency>
  <groupId>com.capgemini.mrchecker</groupId>
  <artifactId>mrchecker-core-module</artifactId>
  <version>4.12.1.1</version>
 </dependency>
 <dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-spring-service-connector</artifactId>
  <version>2.0.4.RELEASE</version>
 </dependency>
 <dependency>
  <groupId>com.capgemini.mrchecker</groupId>
  <artifactId>mrchecker-core-module</artifactId>
  <version>4.12.1.1</version>
 </dependency>
 </dependencies>

 <build>
 <plugins>
  <plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  </plugin>
 </plugins>
 </build>

</project>

代碼生成器類

package com.wy.testpuls.util;

import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
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;
import java.util.Scanner;

public class MyGenerator {
  public static String scanner(String someThing) {
    Scanner scanner = new Scanner(System.in);
    StringBuilder help = new StringBuilder();
    help.append("請(qǐng)輸入" + someThing + "：");
    System.out.println(help.toString());
    if (scanner.hasNext()) {
      String sc = scanner.next();
      if (StringUtils.isNotEmpty(sc)) {
        return sc;
      }
    }
    throw new MybatisPlusException("請(qǐng)輸入正確的" + someThing + "！");
  }

  public static void main(String[] args) {
    // 代碼生成器
    AutoGenerator mpg = new AutoGenerator();

    // 全局配置
    GlobalConfig gc = new GlobalConfig();
    String projectPath = System.getProperty("user.dir");
    gc.setOutputDir(projectPath + "/src/main/java");
    gc.setAuthor("山石");
    gc.setOpen(false);
    mpg.setGlobalConfig(gc);

    // 數(shù)據(jù)源配置
    DataSourceConfig dsc = new DataSourceConfig();
    dsc.setUrl("jdbc:mysql://localhost:3306/test?useUnicode=true&useSSL=false&characterEncoding=utf8");
    dsc.setDriverName("com.mysql.jdbc.Driver");
    dsc.setUsername("root");
    dsc.setPassword("admin");
    mpg.setDataSource(dsc);

    // 包配置
    PackageConfig pc = new PackageConfig();
    pc.setModuleName(scanner("請(qǐng)輸入你的包名"));
    pc.setParent("com.wy");//你哪個(gè)父目錄下創(chuàng)建包
    mpg.setPackageInfo(pc);

    // 自定義配置
    InjectionConfig cfg = new InjectionConfig() {
      @Override
      public void initMap() {
        // to do nothing
      }
    };

    // 如果模板引擎是 freemarker
    String templatePath = "/templates/mapper.xml.ftl";
    // 如果模板引擎是 velocity
    // String templatePath = "/templates/mapper.xml.vm";

    // 自定義輸出配置
    List<FileOutConfig> focList = new ArrayList<>();
    // 自定義配置會(huì)被優(yōu)先輸出
    focList.add(new FileOutConfig(templatePath) {
      @Override
      public String outputFile(TableInfo tableInfo) {
        // 自定義輸出文件名 ， 如果你 Entity 設(shè)置了前后綴、此處注意 xml 的名稱會(huì)跟著發(fā)生變化??！
        return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
            + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
      }
    });
    cfg.setFileOutConfigList(focList);
    mpg.setCfg(cfg);

    // 配置模板
    TemplateConfig templateConfig = new TemplateConfig();

    // 配置自定義輸出模板
    //指定自定義模板路徑，注意不要帶上.ftl/.vm, 會(huì)根據(jù)使用的模板引擎自動(dòng)識(shí)別
    // templateConfig.setEntity("templates/entity2.java");
    // templateConfig.setService();
    // templateConfig.setController();

    templateConfig.setXml(null);
    mpg.setTemplate(templateConfig);

    // 策略配置,數(shù)據(jù)庫表配置
    StrategyConfig strategy = new StrategyConfig();
    //數(shù)據(jù)庫表映射到實(shí)體的命名策略
    strategy.setNaming(NamingStrategy.underline_to_camel);
    //數(shù)據(jù)庫表字段映射到實(shí)體類的命名策略
    strategy.setColumnNaming(NamingStrategy.underline_to_camel);
    //自定義繼承entity類，添加這一個(gè)會(huì)在生成實(shí)體類的時(shí)候繼承entity
    //strategy.setSuperEntityClass("com.wy.testCodeGenerator.entity");
    //實(shí)體是否為lombok模型
    strategy.setEntityLombokModel(true);
    //生成@RestController控制器
    strategy.setRestControllerStyle(true);
    //是否繼承controller
    // strategy.setSuperControllerClass("com.wy.testCodeGenerator.controller");
    strategy.setInclude(scanner("表名，多個(gè)英文逗號(hào)分割").split(","));
    strategy.setSuperEntityColumns("id");
    //駝峰轉(zhuǎn)連字符串
    strategy.setControllerMappingHyphenStyle(true);
    //表前綴
    strategy.setTablePrefix(pc.getModuleName() + "_");
    mpg.setStrategy(strategy);
    mpg.setTemplateEngine(new FreemarkerTemplateEngine());
    mpg.execute();
  }
}

注意：測試時(shí)輸入的表名必須和數(shù)據(jù)庫中一致，區(qū)分大小寫。

疑問：生成的實(shí)體類當(dāng)中沒有id。求解

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