当在查询的时候需要传入多个参数的时候该怎么办呢:shiyong

1,封装成一个Model对象,底层HashMap还是一个

2,使用HashMap封装

3,使用注解,@param

queryUserByuserNameAndPass(String userName,String PassWord);  //返回值类型为Usre  

//sql

<select id="queryUserByuserNameAndPass"  resultType="User">

select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}//会报错的

</select>

改为如下:

<select id="queryUserByuserNameAndPass"  resultType="User">

select * from user u where u.user_name=#{0} and u.pass_word=#{1}//运行成功但是,可读性不高

</select>

//使用HashMap定义:

HashMap <String,Object> map=new HashMap<String,Object>();

map.put("userName","zhangsan");

map.put("password","123456");

queryUserByuserNameAndPass(map);//为返回值类型为User

//sql 如下:

<select id="queryUserByuserNameAndPass"  resultType="User">

select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}//

</select>

ibati用HashMap封装是sql如下:

<select id="queryUserByuserNameAndPass"  parameterClass="java.util.HashMap"  resultType="User">

select * from user u where u.user_name=#{userName} and u.pass_word=#{passWord}

</select>

mybati之parameterType传递多个参数