「小程序JAVA实战」Springboot版mybatis逆向生成工具（32）

我们的整个项目的构建和分层已经完毕了，现在需要通过一个 工具 将我们整个数据库，反向升成pojo和mybatis类。源码：https://github.com/limingios/wxProgram.git 中的wx-springboot

代码生成器

逆向生成 mysql 对应的pojo和mybatis通过单独的一个工程不影响现有的业务逻辑。

• mybatis-generatorConfig工程

通过源码里面的 sql 生成对应的表结构和表数据。

mybatis-generatorConfig的pom文件

<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.idig8</groupId>
    <version>0.0.1-SNAPSHOT</version>

  <artifactId>mybatis-generatorConfig</artifactId>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>

        <!-- 引入log4j日志依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j</artifactId>
            <version>1.3.8.RELEASE</version>
        </dependency>

        <!-- 阿里开源数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.41</version>
        </dependency>

        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!--mapper-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>1.2.4</version>
        </dependency>
        <!--pagehelper-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>

        <!-- mybatis 逆向生成工具  -->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
            <scope>compile</scope>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>

添加generatorConfig.xml文件

<?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>
    <context id="MysqlContext" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.idig8.utils.MyMapper"/>
        </plugin>

        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://47.94.162.28:3306/test"
                        userId="XXXXX"
                        password="XXXXX">
        </jdbcConnection>

        <!-- 对应生成的pojo所在包 -->
        <javaModelGenerator targetPackage="com.idig8.pojo" targetProject="src/main/java"/>

        <!-- 对应生成的mapper所在目录 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>

        <!-- 配置mapper对应的java映射 -->
        <javaClientGenerator targetPackage="com.idig8.mapper" targetProject="src/main/java" 
        type="XMLMAPPER"/>


        <table tableName="comments"></table>

    </context>
</generatorConfiguration>

GeneratorDisplay.java类

package com.idig8.mybatis.utils;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;


public class GeneratorDisplay {

    public void generator() throws Exception{

        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        //指定 逆向工程配置文件
        File configFile = new File("generatorConfig.xml"); 
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);

    } 

    public static void main(String[] args) throws Exception {
        try {
            GeneratorDisplay generatorSqlmap = new GeneratorDisplay();
            generatorSqlmap.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

添加MyMapper.java文件

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 abel533@gmail.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.idig8.utils;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
    //TODO
    //FIXME 特别注意，该接口不能被扫描到，否则会出错
}

• 运行GeneratorDisplay的main方法

1. 复制com.idig8.mapper目录到wx-springboot-mapper项目下
   

2. 复制com.idig8.pojo 目录到wx-springboot-pojo项目下

   

3. 复制com.idig8.utils 目录到wx-springboot-common项目下

   

4. 复制resources mapper到wx-springboot-api的resources里面

   

PS：mybatis-generatorConfig 可以看成一个单独的项目，主要的目的就是为了升成对应的mapper.xml和对应的pojo实体类，mapper对应的实体。

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