Assembly: System.Data.OracleClient (in system.data.oracleclient.dll)
'Declaration Public Overrides Function ExecuteScalar As Object 'Usage Dim instance As OracleCommand Dim returnValue As Object returnValue = instance.ExecuteScalar
Return ValueThe first column of the first row in the result set as a .NET Framework data type, or a null reference if the result set is empty or the result is a REF CURSOR.
Use the ExecuteScalar method to retrieve a single value (for example, an aggregate value) from a database. This requires less code than using the ExecuteReader method, and then performing the operations necessary to generate the single value from the data returned by an OracleDataReader.
A typical ExecuteScalar query can be formatted as in the following C# example:
CommandText = "SELECT COUNT(*) FROM Region"; Int32 count = (int32) ExecuteScalar();
The following example creates an OracleCommand and then executes it using ExecuteScalar. The example is passed a string that is an SQL statement that returns an aggregate result, and a string to use to connect to the database.
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.