Question

I have two columns syntax and query in my table Table1. Syntax contains data called po and a query called select * from po_pomas_pur_order_hdr where pomas_pono =. I got this query value by using

SqlDataAdapter da = new SqlDataAdapter("select query from Table1 where syntax = '" + textBox1.Text + "'", conn);

And my problem is that I need to dynamically pass another value inside the query which I retrived using dataadapter like this:

 SqlDataAdapter da1 = new SqlDataAdapter(da.tostring()  +"'"+ textBox1.Text +"'", conn)

The resulting query should be like this:

 select * from po_pomas_pur_order_hdr where pomas_pono = '2PO/000002/09-10'

But it is not possible. How to get a query like this? Any suggestion?

Answer 1

SqlDataAdapter is used to fill datasets and datatables. You cannot obtain the result of a query with ToString(). I think you want to use SqlCommand to execute your first query to retrieve the actual query to run from the database like this:

string query = null;
using (var command = new SqlCommand("select query from Table1 where syntax = @Syntax", conn))
{
    command.Parameters.AddWithValue("@Syntax", textBox1.Text);
    query = command.ExecuteScalar(); // this assumes only one query result is returned
}

Then you can use the data adapter to fill it:

SqlDataAdapter da1 = new SqlDataAdapter(query  +"'"+ textBox1.Text +"'", conn);

Although I would suggest to use parameters for that as well.