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1.结构图,包含了自动生成的3个文件:CategoryMapper.java ,CategoryMapper.xml 和 Category.java
首先,你要将生成包放到lib目录下,相关的包:mybatis-generator-core-1.3.2.jar 和 mysql-connector-java-5.1.22-bin.jar
在mysql数据库中新建一张表:
Drop TABLE IF EXISTS `category`;
Create TABLE `category` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`catname` varchar(50) NOT NULL,
`catdescription` varchar(200) DEFAULT NULL,
PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
在web工程中,建相关的package,如:
com.mybatis.interfaces 用来存放mybatis 接口对象.
com.mybatis.mapper 用来存放sql mapper对应的映射,sql语句等
com.mybatis.model 用来存放与数据库对应的model
com.mybatis.tester 测试包
新建一个配置文件MyBatisConfiguration.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>
<!-- 配置mysql 驱动jar包路径.用了绝对路径 -->
<classPathEntry
location="D:\DynamicGenerateMybatis\WebContent\WEB-INF\lib\mysql-connector-java-5.1.22-bin.jar" />
<context id="mybatis_mysql_tables" targetRuntime="MyBatis3"> <!-- 为了防止生成的代码中有很多注释,比较难看,加入下面的配置控制 -->
<commentGenerator>
<property name="suppressAllComments" value="true" />
<property name="suppressDate" value="true" />
</commentGenerator>
<!-- 注释控制完毕 --> <!-- 数据库连接 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1:3306/mybatis?characterEncoding=utf8"
userId="root" password="password">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- 数据表对应的model 层 -->
<javaModelGenerator targetPackage="com.mybatis.model"
targetProject="src">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- sql mapper 隐射配置文件 -->
<sqlMapGenerator targetPackage="com.mybatis.mapper"
targetProject="src">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 在ibatis2 中是dao层,但在mybatis3中,其实就是mapper接口 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.mybatis.interfaces" targetProject="src">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 要对那些数据表进行生成操作,必须要有一个. -->
<table schema="mybatis" tableName="category" domainObjectName="Category"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false">
</table>
</context>
</generatorConfiguration>
新建一个类GenerateMain.java来测试并生成相应的文件
package com.mybatis.tester;
import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
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.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;
public class GenerateMain {
/**
* @param args
*/
public static void main(String[] args) {
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
String genCfg = "/MyBatisConfiguration.xml";
File configFile = new File(GenerateMain.class.getResource(genCfg).getFile());
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = null;
try {
config = cp.parseConfiguration(configFile);
} catch (IOException e) {
e.printStackTrace();
} catch (XMLParserException e) {
e.printStackTrace();
}
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = null;
try {
myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
} catch (InvalidConfigurationException e) {
e.printStackTrace();
}
try {
myBatisGenerator.generate(null);
} catch (SQLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
运行main方法后,就会自动生成相应的文件了。