DB2 SQL-PreparedStatement未解决的非类型化表达式错误

我在处理一份准备好的声明时犯了一个奇怪的错误

这是在Squirrel SQL中工作的查询：

SELECT CUSTOMER, MAX(TRANSACTION_COUNT) as UNIT_COUNT, '2018-05-20' as EVENT_DATE, 'XYZ File Transfer' as TYPE, 'Financial Report' as EVENT 
FROM  REPORT_TABLE RT  
WHERE upper(REPORT_STATUS) = 'READY' and TRUNC(CREATED_TS) = '2018-05-20' and TRANSACTION_COUNT > 0 
GROUP BY CUSTOMER

这是我准备好的声明：

SELECT CUSTOMER, MAX(TRANSACTION_COUNT) as UNIT_COUNT, :date as EVENT_DATE, 'XYZ File Transfer' as TYPE, 'Financial Report' as EVENT 
FROM  REPORT_TABLE RT  
WHERE upper(REPORT_STATUS) = 'READY' and TRUNC(CREATED_TS) = :date and TRANSACTION_COUNT > 0 
GROUP BY CUSTOMER

该参数由以下人员设置：

参数增值（“日期”，“2018-05-20”）

当我将其作为PreparedStatement运行时，会收到以下错误消息：

nested exception is com.ibm.db2.jcc.am.SqlSyntaxErrorException: DB2 SQL Error: SQLCODE=-418, S    QLSTATE=42610, SQLERRMC=unresolved untyped expression, DRIVER=4.19.66

我试图查看一些有关错误消息的IBM参考资料，但与我手头的问题无关

感谢所有帮助。

尝试使用CAST或DATE（）告诉编译器预期的类型，例如：

SELECT CUSTOMER, MAX(TRANSACTION_COUNT) as UNIT_COUNT, DATE(:date) as EVENT_DATE, 'XYZ File Transfer' as TYPE, 'Financial Report' as EVENT 
FROM  REPORT_TABLE RT  
WHERE upper(REPORT_STATUS) = 'READY' and TRUNC(CREATED_TS) = CAST(:date as DATE) and TRANSACTION_COUNT > 0 
GROUP BY CUSTOMER

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params.addValue（“时间戳”，“2018-05-2018”）哎呀，我的胖手指。可能是