How Can I read a sql file(Which contains select statements) line by line and execute it.

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I have created the web Application But i am unable to execute more than one line
protected void btnExecute_Click(object sender, EventArgs e)

string path = FileUpload1.PostedFile.FileName;//I am using FileUpload COntrol
System.IO.StreamReader sr = new System.IO.StreamReader(path);
string line;
string str = "";
int counter = 0;
while ((line = sr.ReadLine()) != null)
{
str = line;

counter++;
}
txtQuery.Text = str;
SqlCommand cmd = new SqlCommand();
cmd.CommandText = txtQuery.Text;
cmd.Connection = conn;
conn.Open();
GridView1.DataSource = cmd.ExecuteReader();
GridView1.DataBind();
sr.Close();

Posted 9-Apr-15 2:05am

gaurav goyal

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Sascha Lefèvre · Accepted Answer · 2015-04-09T02:26:00

Solution 1

Your while-loop overwrites on each iteration str with the last read line. So, when the loop is finished, str only contains the very last line of your file. You should instead append line to str and that's best done with a StringBuilder:

C#

string line;
StringBuilder sb = new StringBuilder();
int counter = 0;
while ((line = sr.ReadLine()) != null)
{
   sb.AppendLine(line);
   counter++;
}
txtQuery.Text = sb.ToString();

Note that this all only makes sense if you actually need the line-count of the file. Otherwise you could just read it all at once with sr.ReadToEnd()

Edit: You should use your StreamReader and your SqlCommand in a using-Block and supply the argument CommandBehavior.CloseConnection to your ExecuteReader-call.

Posted 9-Apr-15 2:26am

Sascha Lefèvre

Updated 9-Apr-15 2:34am

v2

Comments

gaurav goyal 22-Apr-15 2:36am

Hi Sascha Thanks for replying
I want to execute SQL file which contains multiple select statement.
How Can I do it?

Sascha Lefèvre 22-Apr-15 11:26am

Hi Gaurav Goyal, you're welcome.

You can execute multiple select-statements as a batch and then use SqlDataReader.NextResult() to advance to the next result-set after reading the previous one. Plase take a look here:

http://csharp.net-informations.com/data-providers/csharp-multiple-resultsets.htm
http://stackoverflow.com/questions/14710903/returning-multiple-sql-query-results-c-sharp

gaurav goyal 27-Apr-15 1:49am

Thanks... @Sascha

gaurav goyal 29-Apr-15 6:55am

Hi Sascha I need to show result of these multiple select statements in separate gridview.How can I do that