SSM+Maven整合时在Eclipse中使用Mybatis逆向工程自动生成代码

灰太狼 2023-10-18 12:54 8阅读 0赞

## 场景 ##

MybatisGenerator 官方文档

[http://www.mybatis.org/generator/configreference/xmlconfig.html][http_www.mybatis.org_generator_configreference_xmlconfig.html]

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

## 实现 ##

项目搭建好完整的包，包括bean、dao、service、test、utils、mapper

### 项目目录 ###

此为生成完代码之后的目录

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

### 数据库配置 ###

在数据库ssm\_crud中新建表tbl\_emp(员工表)

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

再新建tbl\_dept表(部门表)

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

两个表建立外键关联

![Image 1][]![20181222124713280.jpg][]

### 逆向工程 ###

首先需要引入逆向工程相关依赖

打开Maven中央仓库，搜索mybatis generator

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

点进去，选择1.3.7版本

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5][]

将其复制到pom.xml中

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 6][]

代码为：

<dependency>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-core</artifactId>
          <version>1.3.7</version>
      </dependency>

根据官方文档说明

需要一个配置文件，在与pom.xml同级目录下我们新建mbg.xml,用于配置逆向工程。

官方实例文档：

<?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>
      <classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" />
    
      <context id="DB2Tables" targetRuntime="MyBatis3">
        <jdbcConnection driverClass="COM.ibm.db2.jdbc.app.DB2Driver"
            connectionURL="jdbc:db2:TEST"
            userId="db2admin"
            password="db2admin">
        </jdbcConnection>
    
        <javaTypeResolver >
          <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
    
        <javaModelGenerator targetPackage="test.model" targetProject="\MBGTestProject\src">
          <property name="enableSubPackages" value="true" />
          <property name="trimStrings" value="true" />
        </javaModelGenerator>
    
        <sqlMapGenerator targetPackage="test.xml"  targetProject="\MBGTestProject\src">
          <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
    
        <javaClientGenerator type="XMLMAPPER" targetPackage="test.dao"  targetProject="\MBGTestProject\src">
          <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
    
        <table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
          <property name="useActualColumnNames" value="true"/>
          <generatedKey column="ID" sqlStatement="DB2" identity="true" />
          <columnOverride column="DATE_FIELD" property="startDate" />
          <ignoreColumn column="FRED" />
          <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
        </table>
    
      </context>
    </generatorConfiguration>

这里具体的配置文件内筒mbg.xml

<?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="DB2Tables" targetRuntime="MyBatis3">
      
      <commentGenerator>
       <property name="suppressAllComments" value="true" />
      </commentGenerator>
      
      <jdbcConnection driverClass="com.mysql.jdbc.Driver"
       connectionURL="jdbc:mysql://localhost:3306/ssm_crud" userId="root"
       password="123">
      </jdbcConnection>
    
      <javaTypeResolver>
       <property name="forceBigDecimals" value="false" />
      </javaTypeResolver>
      
      
      <javaModelGenerator targetPackage="com.badao.ssm.bean"
       targetProject=".\src\main\java">
       <property name="enableSubPackages" value="true" />
       <property name="trimStrings" value="true" />
      </javaModelGenerator>
    
      
      <sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
       <property name="enableSubPackages" value="true" />
      </sqlMapGenerator>
    
      
      <javaClientGenerator type="XMLMAPPER"
       targetPackage="com.badao.ssm.dao" targetProject=".\src\main\java">
       <property name="enableSubPackages" value="true" />
      </javaClientGenerator>
    
    
      
      
      <table tableName="tbl_emp" domainObjectName="Employee"></table>
      <table tableName="tbl_dept" domainObjectName="Department"></table>
     </context>
    </generatorConfiguration>

### 生成代码 ###

根据官方文档说明，选择Running Mybatis Generator With Java

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 7][]

官方示例：

List<String> warnings = new ArrayList<String>();
       boolean overwrite = true;
       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);

在test包下新建MBGTest.java,用于生成代码

package com.badao.ssm.test;
    
    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 MBGTest {
    
     public static void main(String[] args) throws Exception {
      List<String> warnings = new ArrayList<String>();
      boolean overwrite = true;
      File configFile = new File("mbg.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);
     }
    }

### 运行 ###

右键run as Java Application，选中项目，右键refresh，刷新，可以看到相应代码已经生成。

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 8][]

### 源码下载 ###

[https://download.csdn.net/download/badao\_liumang\_qizhi/10868928][https_download.csdn.net_download_badao_liumang_qizhi_10868928]

[http_www.mybatis.org_generator_configreference_xmlconfig.html]: http://www.mybatis.org/generator/configreference/xmlconfig.html
[Image 1]: 
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[20181222124713280.jpg]: https://img-blog.csdnimg.cn/20181222124713280.jpg
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20181222124728961.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 8]: https://img-blog.csdnimg.cn/20181222124900662.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_download.csdn.net_download_badao_liumang_qizhi_10868928]: https://download.csdn.net/download/badao_liumang_qizhi/10868928