SSM框架搭建（三） 数据库创建和MyBatis生成器自动生成实体类、DAO接口和Mapping映射文件

DROP TABLE IF EXISTS `Student`;  
CREATE TABLE `Student` (  
  `id` int(11) NOT NULL AUTO_INCREMENT,  
  `user_name` varchar(40) NOT NULL,  
  `password` varchar(255) NOT NULL,  
  `age` int(4) NOT NULL,  
  PRIMARY KEY (`id`)  
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; 
insert  into `Student`(`id`,`user_name`,`password`,`age`) values (1,‘麦麦‘,‘123456‘,24);

<?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>  
<!-- 数据库驱动-->  
    <classPathEntry  location="mysql-connector-java-5.1.25-bin.jar"/>  
    <context id="DB2Tables"  targetRuntime="MyBatis3">  
        <commentGenerator>  
            <property name="suppressDate" value="true"/>  
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->  
            <property name="suppressAllComments" value="true"/>  
        </commentGenerator>  
        <!--数据库链接URL，用户名、密码 -->  
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/maimai" userId="maimai" password="123456">  
        </jdbcConnection>  
        <javaTypeResolver>  
            <property name="forceBigDecimals" value="false"/>  
        </javaTypeResolver>  
        <!-- 生成模型的包名和位置-->  
        <javaModelGenerator targetPackage="com.maimai.pojo" targetProject="src">  
            <property name="enableSubPackages" value="true"/>  
            <property name="trimStrings" value="true"/>  
        </javaModelGenerator>  
        <!-- 生成映射文件的包名和位置-->  
        <sqlMapGenerator targetPackage="com.maimai.mapping" targetProject="src">  
            <property name="enableSubPackages" value="true"/>  
        </sqlMapGenerator>  
        <!-- 生成DAO的包名和位置-->  
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.maimai.IDao" targetProject="src">  
            <property name="enableSubPackages" value="true"/>  
        </javaClientGenerator>  
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->  
        <table tableName="user_t" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>  
</generatorConfigurati