Why my code only read one row?

Question

1.00/5 (1 vote)

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My table have 10 récords and when i use my method only have a "0" that means only read one record because only the first row field is null another fields is not nulls

Query

SQL

string query = "SELECT * FROM Movies";

What I have tried:

using (SqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {

                        if (string.IsNullOrEmpty(sdr["Code"].ToString()))
                        {
                            C_E = "0";
                            this.Update(C_E);
                            //ViewBag.Message = "cero";
                        }
                        else
                        {
                            C_E = sdr["Code"].ToString();
                            this.Update(C_E);
                            // ViewBag.Message = C_E;
                        }


                    }

Posted 29-Oct-18 13:54pm

NerakSeven

Updated 29-Oct-18 20:34pm

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Comments

F-ES Sitecore 30-Oct-18 5:41am

The first thing you need to do is not rely on assumptions. Your assumption that you are only processing one row is probably wrong, and stopping you solving the actual problem. Use the debugger to step through the code line by line to see what it is doing. The problem is more likely to be inside the Update method.

Richard Deeming 30-Oct-18 8:07am

REPOST
You have already posted this in the ASP.NET forum:
https://www.codeproject.com/Messages/5566568/Why-my-code-only-read-one-row.aspx[^]

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OriginalGriff · Answer 1 · 2018-10-29T20:35:00

The problem is not the number of rows that are read - though without your data we can't check that, there may only be one row in the "Movies" table - but that C_E will always have the same value when you exit the loop - the last value read from the data.
I have no idea what your Update method does, but if you want to assemble all the values from your DB you need to do something like this:

C#

using (SqlDataReader sdr = cmd.ExecuteReader())
{
    StringBuilder sb = new StringBuilder();
    while (sdr.Read())
    {
        string temp = sdr["Code"].ToString();
        if (string.IsNullOrEmpty(temp))
        {
            sb.Append("0");
        }
        else
        {
            sb.Append(temp);
        }
        this.Update(temp);
    }
    C_E = sb.ToString();
}