Search on column type nvarchar in SQL Server by Delphi commands

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Hi I have a column of nvarchar or nchar in SQL Server DB which have fields in Persian language.
For search , I should use of character "N" before parameter.
But I don’t know how do it.
The following commands don’t be work properly:
ADOQuery.SQL.text :=('SELECT * ');
ADOQuery.SQL.add('FROM my_table ');
ADOQuery.SQL.add('WHERE my_name = N' + ': my_name _p' );
ADOQuery.Parameters.ParamByName(' my_name _p ').Value := trim(my_name.Text) ;

Thanks very much

Posted 25-Sep-12 0:06am

armm1388

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Maciej Los · Answer 1 · 2012-09-25T10:45:00

The WHERE condition should looks like:

SQL

WHERE [Name] = N'Samuel'

So, you need to use a ' twice, for example:

Delphi

//declare variable to store SQL command
sSQL: string;

//set the value
sSQL := 'SELECT * FROM my_table WHERE my_name = N'':my_name_p''';
ADOQuery.SQL.text := sSQL;
ADOQuery.Parameters.ParamByName('my_name_p').Value := trim(my_name.Text);

More about N in sql queries: http://stackoverflow.com/questions/10025032/what-is-the-meaning-of-the-prefix-n-in-t-sql-statements[^]