ExecuteScalar Method (UniCommand)

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Executes the query, and returns the first column of the first row in the result set returned by the query. Extra columns or rows are ignored.

Syntax

Visual Basic
C#


'Declaration Public Overrides Function ExecuteScalar() As Object


public override object ExecuteScalar()

Return Value

The first column of the first row in the result set.

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 Devart.Common.DbCommand.ExecuteReader method, and then performing the operations necessary to generate the single value from the data returned by a Devart.Common.DbDataReader.

Example

This example shows typical usage of Devart.Common.DbCommand.ExecuteScalar() method.

csharp


using(UniConnection conn = new UniConnection(connectionString)) { conn.Open(); UniCommand cmd = conn.CreateCommand(); cmd.CommandText = "SELECT count(*) as NumberOfRegions FROM regions"; Int64 count = Convert.ToInt64(cmd.ExecuteScalar()); }

using(UniConnection conn = new UniConnection(connectionString)) {
  conn.Open();
  UniCommand cmd = conn.CreateCommand();
  cmd.CommandText = "SELECT count(*) as NumberOfRegions FROM regions";
  Int64 count = Convert.ToInt64(cmd.ExecuteScalar()); 
}

Visual Basic


Dim conn As New UniConnection(connectionString) conn.Open() Dim cmd As UniCommand = conn.CreateCommand() cmd.CommandText = "SELECT count(*) as NumberOfRegions FROM regions" Dim count As Int64 = Convert.ToInt64(cmd.ExecuteScalar()); conn.Close()

Dim conn As New UniConnection(connectionString)
conn.Open()
Dim cmd As UniCommand = conn.CreateCommand()
cmd.CommandText = "SELECT count(*) as NumberOfRegions FROM regions"
Dim count As Int64 = Convert.ToInt64(cmd.ExecuteScalar()); 
conn.Close()

Reference

UniCommand Class
UniCommand Members

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