Update excel : syntax error in UPDATE statement

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Hello everyone,

I'm trying to update an excel file. I used OLEDB connection for read data from excel and now i want to use it for update the data.

I can import data from excel to datagridview. So if there is anyway to update all data from datagridview to excel, it would be great. I'm open for any suggestion.

Here is my code :

C#

OleDbConnection baglan = new OleDbConnection();
                            baglan.ConnectionString = @"Provider = Microsoft.ACE.OLEDB.12.0; Data Source = " + yeniDosya + "; Extended Properties = 'Excel 8.0;IMEX=1;'";
                            baglan.Open();
                            string sit = sheetadi;
                            sit = sit.TrimEnd('\'');
                            sit = sit.TrimStart('\'');
                            string shtsrg = sit + "K" + i + ":K" + i;
                            
                            string excel = String.Format("UPDATE {0} SET F1=" + dataGridView1.Rows[i].Cells[9].Value.ToString() + "", shtsrg);
                            MessageBox.Show(excel);
                            OleDbCommand cmd = new OleDbCommand(excel, baglan);
                            cmd.ExecuteNonQuery();

Let me explain simply :

yenidosya : is excel files name
sheetadi : is sheets name ( i am taking it from somewhere else )
In sheetadi i have ' at start and end. so i trim it
i is my column number and it can change parametric
with shtsrg i want to merge sheetname and column number ( it's also my table name )
I used excel string for make table name parametric

I'm trying to use this method :

How to update single cell of excel sheet using oledb connection, | The ASP.NET Forums[^]

But it gives me an error :

Syntax error in UPDATE statement

Do you have any suggestion about where is Syntax error , or which block has problem ?

What I have tried:

How to update single cell of excel sheet using oledb connection, | The ASP.NET Forums[^]

Posted 13-Feb-17 7:46am

kozmikadam

Updated 13-Feb-17 8:11am

v2

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ZurdoDev 13-Feb-17 14:42pm

Just look at the sql and find it. Not hard to do.

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OriginalGriff · Answer 1 · 2017-02-13T08:11:00

Solution 1

Nope. And we can't - we have no idea what your UPDATE command looks like, because you are building it (badly, but I'll come to that) from parts which are not available to us: A DataGridView cell content, and a variable.

So, its going to be up to you.
Put a breakpoint on the first line in the function, and run your code through the debugger. Then look at your code, and at your data and work out what should happen manually. Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track (or run it again and look more closely) to find out why.

Sorry, but we can't do that for you - time for you to learn a new (and very, very useful) skill: debugging!

But don't do it like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

Posted 13-Feb-17 8:11am

OriginalGriff

Comments

kozmikadam 13-Feb-17 14:27pm

Hello ,
I'm not a pro-coder. So i guess it's normal to make this type faults and learning : what i shouldn't do it and why. :)

I'm using breakpoints also.
I can say excel string is : UPDATE 30187$K6:K6 SET F1=OK
But when i put this string in to directly excel string ( without any parametric content ) it's gives same error.

And when i tried just like on the link, i get same error.

Or do you have any other suggestion for update excel's some cell's value from datagridview ?

OriginalGriff 13-Feb-17 14:37pm

Assuming that "30187" is your sheet name, try quoting the value, and escaping the address:
UPDATE [30187$K6:K6] SET F1='OK'

kozmikadam 13-Feb-17 14:38pm

i tried this also :) still got error.

Michael_Davies 13-Feb-17 14:57pm

Normally sheet names are contained in single quotes try UPDATE '30187'$K6:K6 SET F1=OK

kozmikadam 13-Feb-17 15:04pm

hi, it gives syntax error still.

But i restart my computer, and now it didn't give any error for : UPDATE [30187$K6:K6] SET F1='OK' but now program freezes. And it isn't in any loop.

Michael_Davies 13-Feb-17 15:22pm

Why are you using a cell reference in the sheet name, I am presuming you are trying to set cell F1's value to 'OK', if so try:

UPDATE '30187' SET F1='OK'

kozmikadam 13-Feb-17 15:27pm

Syntax error in query. Incomplete query clause.
Accually, i don't have any idea. I'm trying it first time. And examine some posts about it. And found the link abowe.

Michael_Davies 13-Feb-17 15:32pm

There is an example similar to what you are trying to do

http://stackoverflow.com/questions/18391924/updating-excel-sheet-using-oledb

string commandString = String.Format("UPDATE [{0}${1}{2}:{1}{2}] SET F1='{3}'",worksheetName, column, row, data);

Plus you'll have to set HDR=NO in your connection string, see the answer in the link but here's the relevant text

The only difference to note here is the "SET F1='{3}'". This will set the cell you specified in your range to what's in the data variable.
Note the use of "F1". This is simply a default that is used when "HDR=NO" is specified in your connection string, in other words, there are no column headers or names. If you had column headers you would use that in place of F1. It is important to understand here that F1 does NOT correspond to cell F1 in any way.