ExecuteScalar(String) Method

Visual Basic (Declaration)
Visual Basic (Usage)
C#
Managed Extensions for C++
C++/CLI

Overloads Function ExecuteScalar( _
   ByVal sql As String _
) As Object

Dim instance As IDataHelper
Dim sql As String
Dim value As Object
 
value = instance.ExecuteScalar(sql)

object ExecuteScalar( 
   string sql
)

Object* ExecuteScalar( 
   string* sql
)

Object^ ExecuteScalar( 
   String^ sql
)

Parameters

sql: A scalar SQL statement

Return Value

First column of first row

C#

//Get the current thread static safe instance of the helper
IDataHelper db = DataHelper.SessionFactory();
 
//Specify User Name and License Key from the receipt, leave blank for trial mode
//db.UserName = "John Smith 1234";
//db.LicenseKey = "asdfl219==";
 
//Log to the console
db.EnableLogging();
 
//Open the database connection
db.OpenConnection();
 
//Create a new Person to save to the database
Person currentPerson = new Person();
currentPerson.FirstName = "John";
currentPerson.LastName = "Smith";
 
//Save it to the database 
db.Save(currentPerson);
 
string sql = "SELECT COUNT(1) FROM PERSONS";
int results = (int) db.ExecuteScalar(sql);
 
//Close the connection
db.CloseConnection();

VB.NET

'Get the current thread static safe instance of the helper
Dim db As IDataHelper = DataHelper.SessionFactory()
 
'Specify User Name and License Key from the receipt, leave blank for trial mode
'db.UserName = "John Smith 1234"
'db.LicenseKey = "asdfl219=="
 
'Log to the console
db.EnableLogging()
 
'Open the database connection
db.OpenConnection()
 
'Create a new Person to save to the database
Dim currentPerson As New Person()
currentPerson.FirstName = "John"
currentPerson.LastName = "Smith"
 
'Save it to the database 
db.Save(currentPerson)
 
Dim sql As String = "SELECT COUNT(1) FROM PERSONS"
Dim results As Integer = CInt(Fix(db.ExecuteScalar(sql)))
 
'Close the connection
db.CloseConnection()

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

IDataHelper Interface
IDataHelper Members
Overload List