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OracleCommand.ExecuteScalar Method

.NET Framework 4.5

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)

Syntax

C++

public override Object ExecuteScalar()

Return Value

Type: System.Object
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.

Implements

IDbCommand.ExecuteScalar()

Remarks

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();

Examples

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();
 }

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

OracleCommand Class

System.Data.OracleClient Namespace

Other Resources

Commands and Parameters (ADO.NET)

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