May 2004
Intermediate to advanced
888 pages
22h 31m
English
Content preview from Delphi for .NET Developer’s Guide
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Specifying Parameters Using IDbParameter
When executing SQL code, it’s highly unlikely that the SQL statement values will be hard-coded as in Listing 19.2, which searched on Canadian customers. What if we wanted to search on German or Mexican customers? The query would have to somehow support dynamic specification of the search criteria. This is done through parameterized queries. In a parameterized query, a placeholder is put in the query statement where the hard-coded search criteria initially resided. Consider the following SQL statement:
c_cmd = 'SELECT * FROM customers WHERE country = @country
In this SQL statement, instead of hard-coding a country name, a parameter is specified using the at symbol (@) prefix to the parameter name (@country ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.