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ibatis中的like语句的写法

2010-07-20 10:42 309 查看
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select * from USERS where USER_NAME like '%wang%';
这种like
语句在ibatis
中怎么写,项目是用ibatis
作为持久层的框架。

<select id="showOneStudentByName"
parameterClass="String" resultMap="studentORM">

select * from t_stu where s_name like #name#

</select>

这样写显然不行

在调用中需要在参数的前后加上%,
比如这样:

    return
sqlMapper.queryForList("Student.showOneStudentByName",
"%"+name+"%");
这样可行,但总显得有些不协调。

最后针对oracle
数据库写法为:

<select
id="showOneStudentByName" parameterClass="String"
resultMap="studentORM">

select * from t_stu where s_name like '%'||#name#||'%'

</select>

 
在调用的时候 就不用去前后加%
了。

注意:sql
语句不要写成select * from t_stu where s_name
like '%$name$%',
这样极易受到注入攻击。

补充说明一下:

对于不同数据字符串连接符不一样。列举mysql
和SQLServer
如下:

      Mysql


      SELECT *

      FROM user

      WHERE username like CONCAT('%', #username#,
'%')

      SQLServer


      SELECT *

      FROM user

      WHERE username like '%' + #username# + 
'%'

原文参考:http://blog.csdn.net/ITshu/archive/2008/10/28/3168620.aspx

 

另外:
,
分隔开的
bean
值可以使用
str2NumList

str2VarList
以代替之前的
$a$
形式

如果表的字段类型是
number
,则使用
str2NumList

如果表的字段类型是
varchar2
,则使用
str2VarList
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