Mybatis-学习笔记（N）mybatis-generator 生成DAO、Mapper、entity

1、mybatis-generator 生成DAO、Mapper、entity

所需环境：jdk

所需jar包：mybatis-generator-core-1.3.5.jar、MySQL-connector-java-5.1.34.jar

一：新建一个文件夹generator（这里我是在E盘新建的E:\generator）用来存放工具jar包和配置文件

二：将准备好的两个jar包直接放在generator文件夹下面

三：在新建的文件夹下面新建一个文件，命名：generator.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>

    <!-- 数据库驱动包位置 -->

    <classPathEntry location="E:\generator\mysql-connector-java-5.1.34.jar" />

    <!-- <classPathEntry location="C:\oracle\product\10.2.0\db_1\jdbc\lib\ojdbc14.jar" />-->

    <context id="DB2Tables" targetRuntime="MyBatis3">

        <commentGenerator>

            <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://localhost:3306/bruce_test?characterEncoding=utf8" userId="root" password="123456">

        </jdbcConnection>

        <javaTypeResolver>

            <property name="forceBigDecimals" value="false" />

        </javaTypeResolver>

        <!-- 生成模型的包名和位置 -->

        <javaModelGenerator targetPackage="andy.model" targetProject="E:\generator\src">

            <property name="enableSubPackages" value="true" />

            <property name="trimStrings" value="true" />

        </javaModelGenerator>

        <!-- 生成的映射文件包名和位置 -->

        <sqlMapGenerator targetPackage="andy.mapping" targetProject="E:\generator\src">

            <property name="enableSubPackages" value="true" />

        </sqlMapGenerator>

        <!-- 生成DAO的包名和位置 -->

        <javaClientGenerator type="XMLMAPPER" targetPackage="andy.dao" targetProject="E:\generator\src">

            <property name="enableSubPackages" value="true" />

        </javaClientGenerator>

        <!-- 多个表直接复制下面的，更改tableName和domainObjectName就可以-->

        <table tableName="bruce_userinfor" domainObjectName="Userinfor" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" />

    </context>

</generatorConfiguration>

四 ：打开cmd命令提示符，进入到E：\generator，输入命令：java -jar mybatis-generator-core-1.3.5.jar -configfile generator.xml -overwrite

2、mapper中传入多个参数

DAO层（不传入的参数不要使用@Param注解）：

package com.login.dao;

import org.apache.ibatis.annotations.Param;

import com.login.entity.User;

public interface IUserMapper {

  User getUserByUsername(@Param("username") String username,
                         @Param("password") String password);

}

mapper层：

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.login.dao.IUserMapper">

  <select id="getUserByUsername" parameterType="map"  resultType="com.login.entity.User">

      SELECT * FROM user WHERE username = #{username} and password= #{password}

  </select>

</mapper>