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:generatormysql-connector-java-5.1.34.jar" />   
    <!-- <classPathEntry location="C:oracleproduct10.2.0db_1jdbclibojdbc14.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:generatorsrc">  
            <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:generatorsrc">  
            <property name="enableSubPackages" value="true" />  
        </sqlMapGenerator>  
        <!-- 生成DAO的包名和位置 -->  
        <javaClientGenerator type="XMLMAPPER" targetPackage="andy.dao" targetProject="E:generatorsrc">
            <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>