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今天在调试项目中的某个功能时发现代码报错：
nested exception is org.apache.ibatis.type.TypeException:
Could not set parameters for mapping: ParameterMapping{property='ACTION_NM', mode=IN, javaType=class java.lang.Object, jdbcType=NVARCHAR, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}.
Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #4 with JdbcType NVARCHAR . Try setting a different JdbcType for this parameter or a different configuration property.
Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #4 with JdbcType NVARCHAR . Try setting a different JdbcType for this parameter or a different configuration property.
Cause: com.microsoft.sqlserver.jdbc.SQLServerException: The index 4 is out of range.
仔细查看Mapper文件后发现SQL中有如下语句：
<if test="DOCID != null and DOCID !=''">
AND (FH.DOCID = #{DOCID,jdbcType=DECIMAL}
OR FH.O_DOCID = #{DOCID,jdbcType=DECIMAL} )
--OR (FH.POLICY_NO in (select distinct POLICY_NO from FS_BIS_DOCUMENT where documentid =#{DOCID,jdbcType=DECIMAL}) and FH.DOCID is null)
</if>
才发现同事在粘贴SQL时将SQL Server中的注释粘贴过来了，造成了此项错误。
注意：在MyBatis中的注释格式是如下：
<if test="DOCID != null and DOCID !=''">
AND (FH.DOCID = #{DOCID,jdbcType=DECIMAL}
OR FH.O_DOCID = #{DOCID,jdbcType=DECIMAL} )
<!-- OR (FH.POLICY_NO in (select distinct POLICY_NO from FS_BIS_DOCUMENT where documentid =#{DOCID,jdbcType=DECIMAL}) and FH.DOCID is null) -->
</if>