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How does the INTO Clause of a SELECT Statement Work |
Mon, Sep 16 2013 7:30 PM | Permanent Link |
Michael Riley ZilchWorks | I've been struggling with how to use the INTO Clause of a SELECT
statement. I'm looking for an example of how to implement it within EDB Manager. I'd also like to know under what circumstances this might be used. Thank you in advance for your help. ------------------------------------------ Here is the documentation I found: http://www.elevatesoft.com/manual?action=viewtopic&id=edb2sql&topic=SELECT SELECT [ALL|DISTINCT] *|<SelectColumn> [,<SelectColumn>] [INTO <OutputParameter>[,<OutputParameter>]] .. .. .. ------------------------------------------ INTO Clause The INTO clause allows you to specify one or more output parameters as the target of a SELECT statement. Such a statement doesn't return a result set at all, which is useful for situations where you only want one, or a few, values from a specific row in a table. Note The use of the INTO clause requires that the SELECT statement only return a single row. If the SELECT statement returns more than one row, then an exception will be raised. ------------------------------------------ -- This SELECT statement returns the -- user-defined version for a given -- table, or NULL if the table does -- not exist. It uses the INTO clause -- to put the resultant value into an -- output parameter. SELECT Version INTO :Version FROM Information.Tables WHERE Name=:Name -- Michael Riley GySgt USMC (Ret) www.zilchworks.com |
Tue, Sep 17 2013 3:58 AM | Permanent Link |
Uli Becker | Michael,
> I've been struggling with how to use the INTO Clause of a SELECT > statement. I'm looking for an example of how to implement it within EDB > Manager. You can use it either in a script/stored procedure or within delphi. E.g.: DECLARE FSelected VARCHAR DEFAULT = ''; DECLARE FMyID integer DEFAULT = 1; Execute Immediate 'Select MyValue INTO ? from MyTable where ID = ?' using FSelected,FMyID; DoSomethingWithFSelected... or in Delphi with MyQuery do begin sql.clear; sql.add('Select MyValue INTO :FSelected from MyTable where ID = :FMyID'); ParamByName('FMyID').asInteger = 1; Open; end; DoSomething with ParamByName('FSelected ').asString; All untested! Hope that helps... Regards Uli |
Tue, Sep 17 2013 8:53 AM | Permanent Link |
Michael Riley ZilchWorks | Uli Becker wrote:
<< You can use it either in a script/stored procedure or within delphi. E.g.: DECLARE FSelected VARCHAR DEFAULT = ''; DECLARE FMyID integer DEFAULT = 1; Execute Immediate 'Select MyValue INTO ? from MyTable where ID = ?' using FSelected,FMyID; DoSomethingWithFSelected... or in Delphi with MyQuery do begin sql.clear; sql.add('Select MyValue INTO :FSelected from MyTable where ID = :FMyID'); ParamByName('FMyID').asInteger = 1; Open; end; DoSomething with ParamByName('FSelected ').asString; >> Thsnkd Uli Michael Riley GySgt USMC (Ret) www.zilchworks.com |
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