MyBatis 根据数据表反向生成 java 实体类等

MyBatis 根据数据表反向生成 java 实体类等

1、MyBatis 根据已有的数据表生成对应的 Java 实体类的配置文件：

　　mybatisReverseGeneratorConfig.xml

　　此文件放到项目的根目录下 

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE generatorConfiguration
 3         PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
 4         "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
 5 <generatorConfiguration>
 6 
 7     <context id="GBaseContext" targetRuntime="MyBatis3" defaultModelType="flat">
 8 
 9         <!--前置分隔符-->
10         <property name="beginningDelimiter" value="`"/>
11         <!--后置分隔符-->
12         <property name="endingDelimiter" value="`"/>
13         <!--设置编码-->
14         <property name="javaFileEncoding" value="UTF-8"/>
15         <!--生成mapper.xml时覆盖原文件-->
16         <plugin type="org.mybatis.generator.plugins.UnmergeableXmlMappersPlugin" />
17 
18         <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
19             connectionURL="jdbc:mysql://127.0.0.1:3309/db_demo"
20             userId="admin"
21             password="123456">
22         </jdbcConnection>
23 
24         <javaModelGenerator targetPackage="com.smbea.po.generated" targetProject="src/main/java">
25             <property name="enableSubPackages" value="true"/>
26             <property name="trimStrings" value="true"/>
27         </javaModelGenerator>
28 
29         <!-- 反向生成持久化对象（*PO） -->
30         <sqlMapGenerator targetPackage="com.smbea.mapper.mysql.generated" targetProject="src/main/resources">
31             <property name="enableSubPackages" value="true"/>
32         </sqlMapGenerator>
33 
34         <!-- 反向生成 Mapper 接口（*Mapper） -->
35         <javaClientGenerator type="XMLMAPPER" targetPackage="com.smbea.mapper.mysql.generated" targetProject="src/main/java">
36             <property name="enableSubPackages" value="true"/>
37         </javaClientGenerator>
38 
39 <!--        <table tableName="%"></table>-->    <!-- % 表示全部表 -->
41         <table tableName="t_user" domainObjectName="User"></table>
42         <table tableName="t_order" domainObjectName="Order"></table>
43         <table tableName="t_trolly" domainObjectName="Trolly"></table>
50 
51     </context>
52 
53 </generatorConfiguration>

2、在项目的 pom.xml 文件加入如下依赖：

1 <dependency>
2             <groupId>org.mybatis.generator</groupId>
3             <artifactId>mybatis-generator-core</artifactId>
4             <version>1.4.0</version>
5         </dependency>

3、反向生成入口类：

 1 package com.smbea.tool;
 2 
 3 import org.mybatis.generator.api.MyBatisGenerator;
 4 import org.mybatis.generator.config.Configuration;
 5 import org.mybatis.generator.config.xml.ConfigurationParser;
 6 import org.mybatis.generator.internal.DefaultShellCallback;
 7  
 8 import java.io.File;
 9 import java.util.ArrayList;
10 import java.util.List;
11 
12 /**
13  * MyBatis 反向工程生成器
14  */
15 public class MyBatisReverseGenerator {
16 
17     public static void main(String[] args) throws Exception {
18         List<String> warnings = new ArrayList<>();
19         boolean overwrite = true;
20         File configFile = new File("mybatisReverseGeneratorConfig.xml");
21         ConfigurationParser cp = new ConfigurationParser(warnings);
22         Configuration config = cp.parseConfiguration(configFile);
23         DefaultShellCallback callback = new DefaultShellCallback(overwrite);
24         MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
25         myBatisGenerator.generate(null);
26     }
27 
28 }