ExecuteScalar(String,IEnumerable<Object>) Method

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

Public Overloads Function ExecuteScalar( _
   ByVal sql As String, _
   ByVal nameValueParameters As IEnumerable(Of Object) _
) As Object

Dim instance As DataHelper
Dim sql As String
Dim nameValueParameters As IEnumerable(Of Object)
Dim value As Object
 
value = instance.ExecuteScalar(sql, nameValueParameters)

public object ExecuteScalar( 
   string sql,
   IEnumerable<object> nameValueParameters
)

public: Object* ExecuteScalar( 
   string* sql,
   IEnumerable<Object*>* nameValueParameters
)

public:
Object^ ExecuteScalar( 
   String^ sql,
   IEnumerable<Object^>^ nameValueParameters
)

Parameters

sql: The scalar SQL
nameValueParameters: Parameters

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 WHERE FirstName=@FirstName AND LastName=@LastName";
int results = (int)db.ExecuteScalar(sql,new object[] {"FirstName", "John", "LastName", "Smith" });
 
//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 WHERE FirstName=@FirstName AND LastName=@LastName"
Dim results As Integer = CInt(Fix(db.ExecuteScalar(sql,new object[] {"FirstName", "John", "LastName", "Smith" })))
 
'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

DataHelper Class
DataHelper Members
Overload List