View source for Documentation:String attribute overflowing

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If your MDriven Server log contains errors like:
 String or binary data would be truncated
You have OCL code, or a part of your system generally puts too-long text into an attribute and then tries to save it.

The rest of the message might be like this:
 @errorinfo=S_OutgoingEmail.SS_OutgoingEma... (length=1153) (System.String) (DbType: String)
In this example, the problem is that the serverside email action gets an exception and tries to write that error message to a too-short string attribute.

You have two options, and you should probably use both:
# Make the string attribute longer to capture what you want to store
# Include code that makes sure you don't overflow the attribute
Use the following OCL to ensure that you never try to write a too-long string:
 <attribute>.subString(1,<attribute>.maxLength-1)
For the example above:
 self.errorinfo.subString(1,self.errorinfo.maxLength-1)
'''See also:''' [[Documentation:OCLOperators maxLength|maxLength]]
[[Category:Error messages]]
{{Edited|July|12|2025}}