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{00024500-0000-0000-C000-000000000046}
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An objecttoken is a reference to an instance of an object that is created. It appears in the form of an int datatype. All other OLE Automation stored procedures need this token to reference the object. The context of the object determines whether the code component runs as an in-process component or an out-process component. If you do not specify a mode, both modes are supported. Parameters must be passed by position, rather than by name.
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sp_OAMethod
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You can use this stored procedure to execute a method of the object specified by objecttoken:
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sp_OAMethod
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objecttoken, method
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[, returnvalue OUTPUT] [, [@parametername =] parameter [OUTPUT] [...n]]
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Interaction with the SQL Server Environment
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If the method is a function, the stored procedure can access a return value. At the end of the stored procedure s parameter list, you should list the parameters of the code components. The direction of the parameters is controlled by the Output keyword in the usual Transact-SQL manner. Parameters can be passed both by position and by name. If passed by name, the parametername (when the @ sign is removed) must match the name of the parameter in the code component. During execution, sp_OAMethod converts Transact-SQL datatypes to OLE Automation (that is, Visual Basic) datatypes. You can find more details on this process later in this chapter.
sp_OASetProperty
This stored procedure sets the property of the object specified by objecttoken to the new value:
sp_OASetProperty
objecttoken, propertyname, newvalue
[, index...]
sp_OAGetProperty
This stored procedure reads the property of the object specified by objecttoken.
sp_OAGetProperty
objecttoken, propertyname
[, @propertyvalue OUTPUT] [, index...]
If you specify the @propertyvalue, it must be a local variable of the appropriate type. If you do not specify the @propertyvalue, the stored procedure returns it in the form of a single-column, single-row resultset.
SQL Server 2000 Stored Procedure Programming
sp_OADestroy
When the OLE Automation object is no longer needed, you should use this stored procedure to destroy the instance of it:
exec sp_OADestroy objecttoken
sp_OAGetErrorInfo
Each OLE Automation stored procedure returns a value that signals its success status. If it returns 0 , the stored procedure was completed successfully. Any other number returned is actually an error code. You can pass that error code value to the sp_OAGetErrorInfo stored procedure to find the source and description of the error as well as the name and context ID of the help file that describes the error:
sp_OAGetErrorInfo [objecttoken ] [, source OUTPUT] [, description OUTPUT] [, helpfile OUTPUT] [, helpid OUTPUT]
You should be meticulous in performing error handling when you use OLE Automation. So many things can go wrong that an up-front investment in error handling will pay huge dividends later on in the development cycle.
Datatype Conversion
Keep in mind that code components and Transact-SQL code use different datatypes. You have to set compatible datatypes on both sides to allow the OLE Automation system stored procedures to automatically convert data between them. You can identify most of the compatible datatypes using common sense (for example,
11:
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varchar, char, text -> String, int -> Long). However, some deserve special attention. When values are converted from Transact-SQL to Visual Basic, binary, varbinary, and image are converted to a one-dimensional Byte array. Any Transact-SQL value set to Null is converted to a Variant set to Null. Decimal and numeric are converted to string (not currency). When values are converted from Visual Basic to Transact-SQL, Long, Integer, Byte, Boolean, and Object are converted to the int datatype. Both Double and Single datatypes are converted to float. Strings shorter than 255 characters are converted to varchar, and strings longer then 255 characters are converted to the text datatype. One-dimensional Byte() arrays shorter then 255 become varbinary values, and those longer than 255 become image values.
TIP: If you have some spare time, you can try something that I ve always wanted to do. Create a COM object that will display a message over the entire screen and play a sound file. You can use this object on a SQL Server machine to draw your attention to it. This technique can be useful if you have a farm of SQL Servers to administer.
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