一、什么是MyBatis逆向工程
MyBatis Generator官方http://mybatis.github.io/generator/index.html MyBatisGeneratorWithMaven http://mybatis.github.io/generator/running/runningWithMaven.html
简单的解释就是通过数据库中的表，自动生成java代码。 一般情况下利用Mabatis框架进行Web应用开发的过程中，需要根据数据库表编写对应的Pojo类和Mapper映射文件，而编写的基础代码大同小异。因此，MyBatis官方提供了一简洁的逆向工程的工具，简化这一过程，让我们能更好的使用Mybatis框架。
二、下载逆向工程
https://github.com/mybatis/generator/releases/tag/mybatis-generator-1.3.2 目录结构如下：
三、使用方法
配置genneratorConfig.xml的数据库连接信息配置generatorConfig，xml中pojo类，mapper类和mapper.xml存放的位置创建两个包放置mapper和pojo类，注意要和配置文件中的一致: <sqlMapGenerator targetPackage="com.shui.learn.mapper" <javaModelGenerator targetPackage="com.shui.learn.po"运行GeneratorSqlmap,即可生成相应的mapper把生成的文件拷贝到自己的工程
详细配置文件:
<?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="testTables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/onlineleaning" userId="root"
password="123">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<javaModelGenerator targetPackage="com.shui.learn.po"
targetProject=".\src">
<property name="enableSubPackages" value="false" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<sqlMapGenerator targetPackage="com.shui.learn.mapper"
targetProject=".\src">
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.shui.learn.mapper"
targetProject=".\src">
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<table schema="" tableName="admin"></table>
<table schema="" tableName="category"></table>
<table schema="" tableName="class"></table>
<table schema="" tableName="college"></table>
<table schema="" tableName="comment"></table>
<table schema="" tableName="course"></table>
<table schema="" tableName="course_catelog"></table>
<table schema="" tableName="reply"></table>
<table schema="" tableName="student"></table>
<table schema="" tableName="student_course"></table>
<table schema="" tableName="sys_permission"></table>
<table schema="" tableName="sys_role"></table>
<table schema="" tableName="sys_role_permission"></table>
<table schema="" tableName="sys_user"></table>
<table schema="" tableName="sys_user_role"></table>
<table schema="" tableName="teacher"></table>
<table schema="" tableName="teacher_student"></table>
</context>
</generatorConfiguration>
GeneratorSqlmap
import java.io.File;
import java.io.IOException;
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.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;
public class GeneratorSqlmap {
public void generator() throws Exception{
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);
}
public static void main(String[] args) throws Exception {
try {
GeneratorSqlmap generatorSqlmap =
new GeneratorSqlmap();
generatorSqlmap.generator();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
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