模糊查詢報錯

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='name', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).
 

mabaits模糊查詢引數型別為pojo類時需使用#{屬性名} 設定佔位符並設值

	<select id="queryItemsByPo"  parameterType="item" resultType="item">
		select * from items name like '%#{name}%'
	</select>

使用以上模糊查詢報錯，使用mysql中concat()函式拼接字串，可避免錯誤

<select id="queryItemsByPo"  parameterType="item" resultType="item">
		select * from items 
		<where>
			<if test="name != null and name !=''">
				name like CONCAT('%',#{name},'%')
			</if>
		</where>
</select>
 

mybaits模糊查詢引數型別為常用型別呢String可以使用以下方式

<select id="findUserByName" parameterType="java.lang.String" resultType="user">
	<!-- ${value}使用不安全value值內引起sql注入  -->
	select * from user where username like '%${value}%' <!-- ; 可帶可不帶 -->
</select>

這樣使用不會報錯