<!-- oracle -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
	select * from t_user where user_name like CONCAT('%',#{search_name},'%')
</select>
<!-- 或者 -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
	select * from t_user where user_name like '%'||#{search_name}||'%' 
</select>

<!-- mysql -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
	select * from t_user where user_name like CONCAT('%',#{search_name},'%')
</select>
	
<!-- sql server -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
	select * from t_user where user_name like '%'+#{search_name}+'%'
</select>

<!-- db2 -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
	select * from t_user where user_name like CONCAT('%',#{search_name},'%')  
</select>
<!-- 或者 -->
<select id="searchUserBySearchName" parameterType="java.lang.String" resultType="com.urm.entity.User">
	select * from t_user where user_name like '%'||#{search_name}||'%' 
</select>

Mybatis中oracle、mysql、db2、sql server的like模糊查询