IBatis查询条件为多个参数时如何配置

1） 用String代替

 String sql = "uid = '" + username + "' and pwd='" + password + "'";
 Integer r = (Integer) sqlMap.queryForObject("checkLogin", sql);

 

 <select id="checkLogin" parameterClass="java.lang.String" resultClass="java.lang.Integer">
      SELECT count(*) AS value FROM userinfo WHERE $sql$
 select>

 

2）用 Map

 Map map=new HashMap();
 map.put("uid", username);
 map.put("pwd", password);
 Integer r = (Integer) sqlMap.queryForObject("checkLogin2", map);

  一种写法：

 <select id="    " parameterClass="java.util.Map" resultClass="java.lang.Integer">
        SELECT count(*) AS value FROM userinfo WHERE uid=#uid# and pwd=#pwd#
 select>

  另一种写法

 <parameterMap class="java.util.HashMap" id="parameterMap">
     <parameter property="uid"/>
     <parameter property="pwd"/>
 parameterMap>
 <select id="checkLogin2" resultClass="java.lang.Integer" parameterMap="parameterMap">
      SELECT count(*) AS value FROM userinfo WHERE uid=? and pwd=?
 select>

3）用bean

 public Student queryStudentsByNameAndId(HashMap hashMap)      {

  Student s=null;
 try {
       s=(Student)sqlMapClient.queryForObject("selectStudentByIdAndName",hashMap);
  } catch (SQLException e) {
       e.printStackTrace();
  }
       return s;
  }

 

 <parameterMap class="java.util.HashMap" id="parameterMap">
       <parameter property="sid"/>
       <parameter property="sname"/>
  parameterMap>

 <select id="selectStudentByIdAndName" resultClass="Student" parameterMap="parameterMap">
        select * from student where  sid=? and sname=?
 select>