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Asked: 2026-05-11T05:49:09+00:00

Been using the code below to return a single record from the database. I

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Been using the code below to return a single record from the database. I have read that ExecuteScalar is the right way to return a single record. I have never been able to get ExecuteScalar to work though. How would I change this to return a single value in VB.Net using ExecuteScalar?

    Dim oracleConnection As New OracleConnection     oracleConnection.ConnectionString = LocalConnectionString()      Dim cmd As New OracleCommand()     Dim o racleDataAdapter As New OracleClient.OracleDataAdapter      cmd.Connection = oracleConnection     cmd.CommandText = 'FALCON.CMS_DATA.GET_MAX_CMS_TH'     cmd.CommandType = CommandType.StoredProcedure      cmd.Parameters.Add(New OracleParameter('i_FACID_C', OracleType.Char)).Value = facilityShortName     cmd.Parameters.Add(New OracleParameter('RS_MAX', OracleType.Cursor)).Direction = ParameterDirection.Output      Try         Using oracleConnection             oracleConnection.Open()             Using oracleDataAdapter                 oracleDataAdapter = New OracleClient.OracleDataAdapter(cmd)                  Dim workingDataSet As DataSet                 oracleDataAdapter.TableMappings.Add('OutputSH', 'RS_MAX')                 workingDataSet = New DataSet                 oracleDataAdapter.Fill(workingDataSet)                   For Each row As DataRow In workingDataSet.Tables(0).Rows                      Return CDate(row('MAXDATE'))                  Next             End Using         End Using
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1 Answer

  1. From Microsoft

    ‘The ExecuteOracleScalar() method of the OracleCommand class is used to execute a SQL statement or stored procedure that returns a single value as an OracleType data type. If the command returns a result set, the method returns the value of the first column of the first row. The method returns a null reference if a REF CURSOR is returned rather than the value of the first column of the first row to which the REF CURSOR points. The ExecuteScalar() method of the OracleCommand class is similar to the ExecuteOracleScalar() method, except it returns a value as a .NET Framework data type.

    Having said that, neither of these methods is useful when working with Oracle stored procedures. Oracle stored procedures cannot return a value as part of the RETURN statement, only as OUT parameters—see the Stored Procedures That Do Not Return Data section. Also, you cannot return a result set except through a REF CURSOR output parameter—this is discussed in the next section.

    You can retrieve the return value for an Oracle function only by using a RETURN parameter (shown in the previous section) and not by using the one of the ExecuteScalar methods.’

    http://msdn.microsoft.com/en-us/library/ms971506.aspx

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