从C＃中的存储过程返回多个记录集

Question

I am having to convert an ASP classic system to C#

I have a stored procedure that can return up to 7 recordsets (depending on the parameters passed in).

I need to know how I can simply return all the recordsets as individual DataTables so that I can loop through whatever is there, skipping to the next DataTable when I get to the end of it without having to run multiple SQL statements and use multiple adapter.Fill statements to add each table into a DataSet.

In classic it was a simple Do While not objRS.EOF loop with a objRS.NextRecordset() when I got to the end of the loop to move to the next statement.

Is there anything I can use that doesn't require a total rewrite of the current back end code?

Each recordset has a different number of columns and rows. They are unrelated to each other. We return multiple recordsets from Stored Proc's to reduce traffic.

Examples would be nice.

Thanks

Answer 1

SqlConnection con=new SqlConnection("YourConnection String");
SqlCommand cmd=new SqlCommand();
SqlDataAdapter da=new SqlDataAdapter();
DataSet ds = new DataSet();
cmd = new SqlCommand("name of your Stored Procedure", con);
cmd.CommandType = CommandType.StoredProcedure;
//cmd.Parameters.AddWithValue("@SuperID", id);//if you have parameters.
da = new SqlDataAdapter(cmd);
da.Fill(ds);
con.Close();

After this you can take advantage of different (7) recordsets using

ds.Tables[0]
ds.Tables[1]
ds.Tables[2]
ds.Tables[3]
ds.Tables[4]
ds.Tables[5]
ds.Tables[6]

Answer 2

If you fill a DataSet using the SqlDataAdapter.Fill() Method then each of your recordsets returned from the stored procedure will be returned as a DataTable within your dataset

DataSet dataset = new DataSet();
using (var adapter = new SqlDataAdapter("yourStoredProcedure", yourConnectionString))
{
    adapter.SelectCommand.CommandType = CommandType.StoredProcedure;
    adapter.Fill(dataset);
}
for (int i = 0; i < dataset.Tables.Count; i++)
{
    // Do something for each recordset
}

If you use a SqlDataReader then use can use the SqlDataReader.NextResult() method to advance to the next recordset:

using (var connection = new SqlConnection(yourConnectionString))
using (var command = new SqlCommand("yourStoredProcedure"))
{
    connection.Open();
    using (var reader = command.ExecuteReader())
    {
        while (reader.Read())
        {
            // do something with first result set;
        }
        if (reader.NextResult())
        {
            while (reader.Read())
            {
                // do something with second result set;
            }
        }
        else
        {
            return;
        }
        if (reader.NextResult())
        {
            while (reader.Read())
            {
                // do something with third result set;
            }
        }
        else
        {
            return;
        }
    }
}

Answer 3

this will return you all you need

using (SqlConnection conn = new System.Data.SqlClient.SqlConnection(connString))
{
    using (SqlCommand cmd = new SqlCommand())
    {
        cmd.CommandText = "yoursp";
        cmd.Connection = conn;
        cmd.CommandType = CommandType.StoredProcedure;

        conn.Open();

        SqlDataAdapter adapter = new SqlDataAdapter(cmd);

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

        conn.Close();
    }
}

Answer 4

you can check if dr has any more recordset ot no by using if (dr.NextResult())

and then loop again with dr.read

try this

string connStr = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
SqlConnection Con = new SqlConnection(connStr);

try
{
    string str1 = "select productid,productname from products;select VendorFName from vendor";
    SqlCommand com = new SqlCommand(str1, Con);

    com.Connection.Open();

    SqlDataReader dr = com.ExecuteReader();

    DropDownList1.Items.Add("Select Product Id");
    DropDownList2.Items.Add("Select Vendor Name");

    while(dr.Read())
    {
        DropDownList1.Items.Add(dr.GetValue(0).ToString());
    }

    if (dr.NextResult())
    {
        while (dr.Read())
        {
            DropDownList2.Items.Add(dr.GetValue(0).ToString());
        }
    }
}
catch (Exception ex)
{
}
finally
{
    if (Con.State == ConnectionState.Open)
    {
        Con.Close();
    }
}