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On sql server, when executing Insert with parameters, Prepare caused an error，
e.g
uniQuery1.SQL.Text:='Insert into t1 (f3) values (:f3)';
uniQuery1.Prepare;//here error

uniSQL.SQL.Text:='Insert into t1 (f1) values (:f1)';
uniSQL.Prepare;
uniSQL.Execute;//here error.

Hi,

You must assign a value to the parameter before prepare.
Something like this:
uniQuery1.ParamByName('f3').ParamType := ptInput;
uniQuery1.ParamByName('f3').DataType := ftString;
uniQuery1.ParamByName('f3').AsString := 'P';

UniQuery can automatically request parameter properties (Name, ParamType, DataType, Size, TableTypeName) from the server when the TUniQuery.Prepare method is executed. For this, you should specify True to the special DescribeParams property:

UniQuery1.SpecificOptions.Add('DescribeParams=True');

Alternatively, you can specify the parameters properties manually before executing the Prepare method, as we already advised in the previous post.

More details about the DescribeParams property: https://www.devart.com/sdac/docs/index. ... params.htm