1.通過順序
<select id = "selectTest" resultMap = "SysResult">
select * from user where name = #{0} and dept = #{1}
</select>
在#{}中的數字代表了傳遞參數的順序,一般不建議使用
2.通過@Param
public User selectTest(@Param("UserName") String name,@Param("deptID") int deptId)
<select id = "selectTest" resultMap = "UserResult">
select * from user where name = #{userName} and dept = #{deptId}
</select>
其中,#{}中的字符串就是@Param修飾的變量名稱,適用於參數較少的情況
3.通過Map
public User selectTest(Map<String,String> items);
<select id = "selectTest" parameterType = "java.util.Map" resultMap = "UserResult">
select * from user where name = #{NameKey} and dept = #{deptKey}
</select>
#{}中的內容就是Map的Key
4.通過實體類
public User selectTest(User user)
<select id = "selectTest" parameterType = "cn.tineaine.pojo.User" resultMap = "UserResult">
select * from user where name = #{userName} and dept = #{dept}
</select>
#{}中的內容是POJO中成員屬性的名稱,其需要通過實體類進行操作,如果需要擴展,則必須修改pojo的內容