Executes the specified select command against SimpleDB
without an item type generic parameter and returns only the first attribute
value in the result set.
Namespace: SimolAssembly: Simol (in Simol.dll) Version: 1.0.0.0
Syntax
| C# |
|---|
public Object SelectScalar( SelectCommand command ) |
| Visual Basic |
|---|
Public Function SelectScalar ( _ command As SelectCommand _ ) As Object |
| Visual C++ |
|---|
public: virtual Object^ SelectScalar( SelectCommand^ command ) sealed |
Parameters
- command
- Type: Simol..::..SelectCommand
The command to execute.
Return Value
The first attribute of the first item in the result set or null if there are no results.Implements
ISimol..::..SelectScalar(SelectCommand)Remarks
This method supports use of the SimpleDB "count" keyword. For example: select count(*) from MyDomain
Exceptions
| Exception | Condition |
|---|---|
| System..::..ArgumentNullException | If the command parameter is null |
| AmazonSimpleDBException | If the request to SimpleDB fails for any reason |
| Simol..::..SimolDataException | If the SimpleDB item cannot be converted into the requested item type |
| Simol..::..SimolConfigurationException | If no valid SimpleDB mapping can be configured for the requested item type |
