How to access rows and columns of a select query

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SQL

var q = db.Execute("a select query");

Hi! I wana access the columns (and rows) obtained from this query (like q[0].column1). But when I store it in a var it is not possible. What kind of datatype or technique can I use? Is there a difference between single row output and multiple row output when doing this? Im working with sql server CE db (sdf file) in webmatrix.

Posted 25-Dec-12 19:43pm

cs101000

Updated 25-Dec-12 22:47pm

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Gianmaria Gregori · Answer 1 · 2013-01-03T13:08:00

The first problem in your question is the way you queries a Database object in Web Pages.
As you can see (Database Class[^]) there are three methods to execute a query:
Query, to obtain a list of rows as IEnumerable<object>;
QuerySingle, to obtain a single row as object;
QueryValue, to obtain a single scalar value.
The Execute method executes a non-query SQL statement, instead.
So, if you want to obtain a list of row you should query your database with this statement:

C#

var q = db.Query("SELECT ... ");

and if you want to obtain your rows sequentially you should use this block of code:

C#

@foreach(var row in q){
   <p>row.FieldName</p>
}

Otherwise, if you want to access your rows randomly, you should convert the IEnumerable to a List:

C#

var q = db.Query("SELECT ... ").ToList();

and then you can use statements like

C#

<p>@q[20].FieldName</p>

Sheikh Muhammad Haris · Answer 2 · 2012-12-27T13:05:00

Try this.

C#

SqlCommand command = new SqlCommand();
command.Connection = sqlCon;
command.CommandType = CommandType.Text;
command.CommandTimeout = 216000;
command.CommandText = "Your Query";
SqlDataAdapter adapter = new SqlDataAdapter(command);
DataTable dt = new DataTable();
adapter.Fill(dt);

string dataValue = dt.Rows[0]["Column_Name"]; // returns First Rows

Hope it helps you.

sisir patro · Answer 3 · 2012-12-25T23:22:00

Solution 2

HI,

Refer the following links these may help you.

C# DataTable
Dataset
DATATABLE and DATASET

These are the different ways that you can access the columns and rows.

Thanks

Posted 25-Dec-12 23:22pm

sisir patro

Dineshshp · Answer 4 · 2012-12-25T19:55:00

if you are working in asp.net with c# :

C#

using(SqlConnection con = new SqlConnection(connectionstring))
{
  con.Open();

  SqlCommand cmd = new SqlCommand("SELECT * FROM tableName", con);
  SqlDataadapter adpt = new SqlDataAdapter(cmd);

  DataSet ds = new DataSet();
  adpt.Fill(ds);

  DataColumn dclA = ds.Tables[0].Columns[0];
  // OR
  DataColumn dclB = ds.Tables[0].Columns["ColumnName"];

  DataRow drA = ds.Tables[0].Rows[0];

  string DataA = drA["ColumnName"].ToString();
  // OR
  string DataB = drA[0].ToString();
}

Try it...

How to access rows and columns of a select query

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