'字符串或二进制数据将被截断'修复无法正常工作。 我究竟做错了什么？

Question

So this is an old question that has been asked many times here, but the obvious solution isn't working for me. I have a query that reads:

INSERT Table1
(
    schoolName
)
VALUES
(
    <cfqueryparam value="#schoolName#" cfsqltype="CF_SQL_VARCHAR" maxlength="50">
)

When running this query, I was getting back the 'String or binary data would be truncated' error that's been reported here dozens of times. I looked at the 'Design' option for my table and the maxlength for schoolName was 20, while the value I was trying to insert was of length 22. So in what I thought was an easy fix I simply ran:

ALTER TABLE Table1
ALTER COLUMN schoolName VARCHAR(50)

However I ran this query again, and got the same error! Is there anything else I need to do or anything dumb I am missing? Could it be a caching issue? From what I can tell, the error is saying that I'm trying to insert a string with a length larger than the column is set to allow, and therefore one (of the many) solutions is to expand the max column length.

Answer 1

Note that the maxlength attribute in the cfqueryparam tag is a validation that simply throws an exception before even sending the query to the SQL Server when the string length exceeds the specified maximum.

In your case it passed and the String or binary data would be truncated message is an error caused by SQL Server. Check if the schoolName column in the Table1 table was properly altered by your change.

On a side note, if you are fine with truncated data, you could always use:

<cfqueryparam value="#left(schoolName, 50)#" cfsqltype="CF_SQL_VARCHAR">

This truncates your value if it exceeds 50 characters without causing an error - unless your table schema specifies an even lower max. length. In this case you would still see the same error message.

Answer 2

I feel stupid making this mistake, but it happens so I'll post the answer for anyone in the future:

There is a trigger set on my Table1 that was inserting into/updating a Table1Log table. Since the Table1Log schoolName column was not altered along with the Table1 schoolName column, I was getting the same error as before. Once I altered the column on both things started working fine.