Export (0) Print
Expand All

OracleCommand.ExecuteScalar Method

Executes the query, and returns the first column of the first row in the result set returned by the query as a .NET Framework data type. Extra columns or rows are ignored.

Namespace: System.Data.OracleClient
Assembly: System.Data.OracleClient (in system.data.oracleclient.dll)

public override Object ExecuteScalar ()
public Object ExecuteScalar ()
public override function ExecuteScalar () : Object
Not applicable.

Return Value

The 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.

public void CreateOracleCommand(string myScalarQuery, OracleConnection connection) 
 {
    OracleCommand command = new OracleCommand(myScalarQuery, connection);
    command.Connection.Open();
    command.ExecuteScalar();
    connection.Close();
 }

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 Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1

Community Additions

ADD
Show:
© 2014 Microsoft