mapper标签if字符串NumberFormatException

错误背景

在mapper中对请求的参数进行判断 

 

		<if test="cateId == 'A'">
		and a.cateId like 'E%' and a.cateId not like 'E50%'
		</if>
		<if test="cateId == 'B'">
		and a.cateId like 'S%' 
		</if>
		<if test="cateId == 'C'">
		and a.cateId like 'G%'
		</if>
		<if test="cateId == 'D'">
		and a.cateId like 'E50%'
		</if>

 

 

 

报错信息

 

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.reflect.UndeclaredThrowableException
### Cause: java.lang.reflect.UndeclaredThrowableException
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:364)
	at com.sun.proxy.$Proxy4.selectList(Unknown Source)

.....

Caused by: java.lang.NumberFormatException: For input string: "C"
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1241)
	at java.lang.Double.parseDouble(Double.java:540)
	at org.apache.ibatis.ognl.OgnlOps.doubleValue(OgnlOps.java:259)

 

 

解决方案

来源：if判断字符串

 

判断应该写成 test='cateId == "A"' 或者test="cateId  == 'A'.toString()"

 

 

 

	<if test="cateId != null and cateId != ''">
		<if test='cateId == "A"'>
			and a.cateId like 'E%' and a.cateId not like 'E50%'
		</if>
		<if test='cateId == "B"'>
			and a.cateId like 'S%'
		</if>
		<if test='cateId == "C"'>
			and a.cateId like 'G%'
		</if>
		<if test='cateId == "D"'>
			and a.cateId like 'E50%'
		</if> 
	</if>