how to check if a value exists in DB table

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how to check if a value exists in a DB table and return a Boolean value to variable in vb.net??

Posted 2-Sep-12 21:02pm

Sharath2790

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2 solutions

Solution 2

Hi Try like this

C#

private void Form4_Load(object sender, EventArgs e)
      {
          int Company_Id = 3;
          Boolean id = Convert.ToBoolean(existCompanyId(Company_Id));
      }

public int existCompanyId(int Company_Id)
{
 
 string SQLConnectionStr = "Password=password;Connection Timeout=0;Persist Security
   Info=False;User ID=userid;Initial Catalog=databasename;Data Source=servername;";
 SqlConnection sqlConnection = new SqlConnection(SQLConnectionStr);
 int CId;

 string TableExists = "IF EXISTS (select * from Company WHERE CompanyId ='" +  
 Company_Id + "') select 1 ELSE select 0";
            
try
  {
   using (SqlConnection spContentConn = new SqlConnection(SQLConnectionStr))
  {
   spContentConn.Open();
   using (SqlCommand TableExistsQry = new SqlCommand(TableExists, spContentConn))
   {
    TableExistsQry.CommandTimeout = 0;
    TableExistsQry.CommandType = CommandType.Text;
    CId = System.Convert.ToInt32(TableExistsQry.ExecuteScalar());
   }
     spContentConn.Close();
  }
    return CId;
 }
 catch (Exception ex)
  {
   throw ex;
  }
}

If the Company Id 3 exists in the table we will get id as true other wise id as false.

Posted 2-Sep-12 21:51pm

D-Kishore

Updated 2-Sep-12 22:04pm

v2

Comments

dmunisubbu 3-Sep-12 3:52am

fine 4+

D-Kishore 3-Sep-12 3:59am

Thank you dmunisubbu

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Roliking · Accepted Answer · 2012-09-02T21:23:00

Solution 1

you can create a function like this and execute the function to get your desired output

SQL

create function fnCheckExists()
returns bit
as
begin
declare @val as bit=0;
if exists (select yourColumn from yourTable)
begin
 set @val=1;
end
else
begin
 set @val=0;
end
return @val
end

Posted 2-Sep-12 21:23pm

Roliking

Comments

Oshtri Deka 3-Sep-12 4:02am

You are checking if there is any record inside a table.
I believe OP wants to check for particular values.