Mybatis报错: Error querying database. Cause: java.lang.NumberFormatException: For input string: “A“

报错信息：Error querying database. Cause: java.lang.NumberFormatException: For input string: “A”

### Error querying database.Cause: java.lang.NumberFormatException: For input string: "A"### Cause: java.lang.NumberFormatException: For input string: "A"org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)com.sun.proxy.$Proxy83.selectOne(Unknown Source)org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:87)org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:58)com.sun.proxy.$Proxy188.showDjRequestGcjszlyjCount(Unknown Source)sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:498)org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)com.sun.proxy.$Proxy189.showDjRequestGcjszlyjCount(Unknown 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解决办法: xml里面 if 判断里面的条件判断字符串相等用双引号，外层套单引号。这是因为在比较的时候默认单引号括起来的是数字 ‘A’ 不能转化为数字 ，所以报错。

[正常情况下用字符串放在单引号里面没有问题，但如果是用==来做判断单个字符时，单引号必须改为双引号，否则会被转化为字符char格式与字符串String格式进行比较，自然就无法匹配通过]

<if test='status == "A"'> ...</if>

注意test括起来的逻辑判断 用单引号的话 全部都用单号 （如果不保持一致的话，下面的写法还是会报错）

<if test="purchase_no !=null and purchase_no !=''"> and pur_zhjj.purchase_no = #{purchase_no}</if><if test='status == "A"'> and pur_zhjj.sd_amt is null</if>