mybatis-plus自动生成代码的调用用法(mybatisplus批量新增)

大家好，又见面了，我是你们的朋友全栈君。

一、介绍

本教程将介绍如何使用 mybatis-plus 工具自动给我们生成 Controller、Service、Entity、Mapper、Mapper.xml 层代码

要求:

① 生成的Controller类，需要继承 BaseController

② 生成的Entity 类，需要继承 BaseEntity

③ 生成的 Service，默认名称下是以 I 开头的接口, 在生成Service层代码中需要把这个 I 去掉

二、实现步骤

① 在数据库中创建好数据库与要生成代码对应的表

这里拿 user 表举例

DROP TABLE IF EXISTS user;

CREATE TABLE user
(
	id BIGINT(20) NOT NULL COMMENT '主键ID',
	name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
	age INT(11) NULL DEFAULT NULL COMMENT '年龄',
	email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱',
	PRIMARY KEY (id)
);

DELETE FROM user;

INSERT INTO user (id, name, age, email) VALUES
(1, 'Jone', 18, 'test1@baomidou.com'),
(2, 'Jack', 20, 'test2@baomidou.com'),
(3, 'Tom', 28, 'test3@baomidou.com'),
(4, 'Sandy', 21, 'test4@baomidou.com'),
(5, 'Billie', 24, 'test5@baomidou.com');

② 创建一个SpringBoot 项目，其中 pom.xml 内容如下:

<?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 https://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>2.1.11.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.lcy</groupId>
    <artifactId>mybatis-plus-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plus-demo</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>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.1</version>
        </dependency>
    </dependencies>

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

</project>

③、BaseController 和 BaseEntity 类

package com.lcy.demo.sys.controller;

public class BaseController {
}


package com.lcy.demo.sys.entity;

public class BaseEntity {
}

④、创建代码生成类

package com.lcy.demo.generator;

import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;

public class MysqlGenerator {


    public static void main(String[] args) {
        AutoGenerator mpg = new AutoGenerator();
        //1、全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/src/main/java");  //生成路径(一般都是生成在此项目的src/main/java下面)
        gc.setAuthor("liangcy"); //设置作者
        gc.setOpen(false);
        gc.setFileOverride(true); //第二次生成会把第一次生成的覆盖掉
        gc.setServiceName("%sService"); //生成的service接口名字首字母是否为I，这样设置就没有
        gc.setBaseResultMap(true); //生成resultMap
        mpg.setGlobalConfig(gc);

        //2、数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/mybatis-plus-demo?useUnicode=true&serverTimezone=GMT&useSSL=false&characterEncoding=utf8");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("123456");
        mpg.setDataSource(dsc);

        // 3、包配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName("sys");
        pc.setParent("com.lcy.demo");
        mpg.setPackageInfo(pc);

        // 4、策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setSuperControllerClass("com.lcy.demo.sys.controller.BaseController");
        strategy.setSuperEntityClass("com.lcy.demo.sys.entity.BaseEntity");
        // strategy.setTablePrefix("t_"); // 表名前缀
        strategy.setEntityLombokModel(true); //使用lombok
        strategy.setInclude("user");  // 逆向工程使用的表   如果要生成多个,这里可以传入String[]
        mpg.setStrategy(strategy);

        //5、执行
        mpg.execute();
    }

}

补充说明: