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PODelete row from SQL table (Date & Time values error)
 

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  1. PODelete row from SQL table (Date & Time values error)
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    <p>I try to write and then delete from an SQL table. My WRITE code is OK, however my DELETE code does not work as I want.</p> <pre><code>//SQL_ConnectionString defined above SqlConnection SQL_Connection = new SqlConnection(SQL_ConnectionString) string INSERT = "INSERT INTO " + tbTable_DAQ.Text + " (Date, Time, Comment)"; string VALUES = "VALUES " + " (@Date, @Time, @Comment)"; string SQL_WriteString = INSERT + VALUES; DateTime DateTimeNow = DateTime.Now; try { //get time DateTimeNow = DateTime.Now; //create SQL command object SqlCommand SQL_Write = new SqlCommand(SQL_WriteString, SQL_Connection); //attach values SQL_Write.Parameters.AddWithValue("@Date", DateTimeNow); SQL_Write.Parameters.AddWithValue("@Time", DateTimeNow); SQL_Write.Parameters.AddWithValue("@Comment", "Table Access Test. "); SQL_Write.ExecuteNonQuery(); //dispose &amp; nullify SQL_Write SQL_Write.Dispose(); SQL_Write = null; } catch (Exception eWrite) { MessageBox.Show(eWrite.ToString(), "SQL WRITE ERROR", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } //now delete inserted row from SQL table string DELETE = "DELETE FROM " + tbTable_DAQ.Text + " "; string FROM = "WHERE " + "Date = " + DateTimeNow + "AND " + "Time = " + DateTimeNow + "AND " + "Comment='Table Access Test.'"; //not working string SQL_DeleteString = DELETE + FROM; try { //create SQL command object SqlCommand SQL_Delete = new SqlCommand(SQL_DeleteString, SQL_Connection); SQL_Delete.ExecuteNonQuery(); //dispose &amp; nullify SQL_Delete SQL_Delete.Dispose(); SQL_Delete = null; } catch (Exception eDelete) { MessageBox.Show(eDelete.ToString(), "SQL DELETE ERROR", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } </code></pre> <p>It give me an error. I believe the error is due to the values of the Date and Time column. On the WRITE code, I think the SQL table converts <code>DateTimeNow</code> to on receiving it on the <code>Date</code> (date type) and <code>Time</code> (time7 type). However, to delete that specific row the values must match (no conversion is done) and I do not know how to get the values right.</p>
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    1. COWhat is the error message.
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    2. COthere are errors on that code. is DateTime.Now for example. Also, why are you separating strings ? why this "WHERE " + "Date = " ? Also, the comment in the where in the delete is different from the inserted (missing space at end), so it won't delete anything
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    3. COI split the string for the ease of seeing. Later on, I can re-use the format for other Column IDs.
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