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How to specify a DefaultExpression for a TField object

 

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If you set up a field attribute set and associate that set with a field in your table that will
work. If you set the value in the object inspector it will let you enter in a string but it will not
reflect the value at runtime. If you try to set the TField.DefaultExpression property at
runtime like this:

MyField.DefaultExpression := 'MyValue';  // (Wrong)
It will compile but you will not get a default value at runtime when you create a new record
in the table by, say, clicking on the + on the DBNavigator. To get the default value to take
at runtime the code assignment needs to be:

MyField.DefaultExpression := '''MyValue'''; // (Correct)
In the Object Inspector you just need to put 'MyValue'. Use single quotes in the Object
Inspector.

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