sol229 发表于 2016-11-26 00:35:05

mybatis OGNL应用扩展

  mybatis中使用ognl的扩展,实现判断传入的字段:
  Mapper文件中:

<select id="getRecentQuestionTitle" parameterType="java.lang.String" resultType="java.lang.String">
select title from song_question where questionState = #{value}
<if test="@Ognl@isSolve(value,0)">
order by questionTime desc
</if>
<if test="@Ognl@isSolve(value,1)">
order by answerTime desc
</if>
limit 0,1
</select>
  Ognl.java文件:

/**使用ognl扩展
* @return
*/
public static boolean isSolve(Object o,String soleState){
if(o == null)
return false;
String str = null;
if(o instanceof String[]){
String[]objects = (String[])o;
str = objects;
}else if(o instanceof Character){
Character c = (Character) o;
str =Character.toString(c);
}
if(StringUtils.equals(str, soleState))
return true;
return false;
}
  该功能为,根据传入的值,
  如果值为0,则order by questionTime desc 根据字段questionTime排序。
  如果值为1,则order by answerTime desc根据字段answerTime排序。
  Ognl.java 必须放在class目录,也就是没有包名。
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