Mybatis查询 注意 传入参数

Myfault solving：
<select id="findUserByNameAndPasswd" resultType="com.xiuye.orm.User"
parameterType="string">
select * from user where username = #{0} and
password=#{1}
</select>

<select id="findUserByPhoneAndPasswd" resultType="com.xiuye.orm.User"
parameterType="string">
select * from user where phone = #{0} and password = #{1}
</select>

<select id="findUserByEmailAndPasswd" resultType="com.xiuye.orm.User"
parameterType="string">
select * from user where email = #{0} and
password=#{1}
</select>

DAO层的函数方法

Public User selectUser(String name,String area);
对应的Mapper.xml

<select id="selectUser" resultMap="BaseResultMap">
select  *  from user_user_t   where user_name = #{0} and user_area=#{1}
</select>
其中，#{0}代表接收的是dao层中的第一个参数，#{1}代表dao层中第二参数，更多参数一致往后加即可。

此方法采用Map传多参数.

Dao层的函数方法

Public User selectUser(Map paramMap);
对应的Mapper.xml

<select id=" selectUser" resultMap="BaseResultMap">
select  *  from user_user_t   where user_name = #{userName，jdbcType=VARCHAR} and user_area=#{userArea,jdbcType=VARCHAR}
</select>
Service层调用

Private User xxxSelectUser(){
Map paramMap=new hashMap();
paramMap.put(“userName”,”对应具体的参数值”);
paramMap.put(“userArea”,”对应具体的参数值”);
User user=xxx. selectUser(paramMap);}
个人认为此方法不够直观，见到接口方法不能直接的知道要传的参数是什么。

Dao层的函数方法

Public User selectUser(@param(“userName”)Stringname,@param(“userArea”)String area);
对应的Mapper.xml

<select id=" selectUser" resultMap="BaseResultMap">
select  *  from user_user_t   where user_name = #{userName，jdbcType=VARCHAR} and user_area=#{userArea,jdbcType=VARCHAR}
</select>