Develop Reference

I want to insert data into the DB automatically after filled a row in datagridview

I bound my DataGridView with a DataBase file. I want to save each and every row to the database after I finish entering values into that row.
I know how to save the complete table but not every row.
The single row that I enter, I want it to save automatically to the DB after I enter a value in last cell of that row and move to the next row.
I wrote some code but not saving but displaying message "record Saved".
Blow my code
private void dataGridView1_RowLeave(object sender, DataGridViewCellEventArgs e)
{
if (e.ColumnIndex == 5)
{
SqlDataAdapter da = new SqlDataAdapter("insert into invtempdb (fullname, quantity, itmbyp, itmprimary, itmtotal) values( '" + dataGridView1.CurrentRow.Cells[1] + "', '" + dataGridView1.CurrentRow.Cells[2] + "','" + dataGridView1.CurrentRow.Cells[3] + "','" + dataGridView1.CurrentRow.Cells[4] + "','" + dataGridView1.CurrentRow.Cells[5] + "')", con);
MessageBox.Show("value saved");
}
else
{
return;
}

Okay, from what I've understood of your question, you need to update the database as soon as you complete filling a row.
You can do that in this way:
The DataGridView has many different events available for usage:
RowLeave
RowsAdded
RowsRemoved
And many more, I think for your exact requirement these three events should be enough.
What you've to do is, put the sql command to update the DataBase inside the event RowLeave. This will update the DataBase everytime you leave the last cell of a particular row.
Read more about the events in their descriptions to find the best suitor for your purpose, but, this is the way to proceed further.
Extension:
I can't see where you've used the RowLeave event, but here's a solution.
SqlConnection con = new SqlConnection(connection string); //put your connection string there
SqlCommand insert = new SqlCommand("insert into invtempdb (fullname, quantity, itmbyp, itmprimary, itmtotal) values(#a,#b,#c,#d,#e);", con)
insert.Parameters.Add("#a",dataGridView1.CurrentRow.Cells[1] );
insert.Parameters.Add("#b",dataGridView1.CurrentRow.Cells[2] );
insert.Parameters.Add("#c",dataGridView1.CurrentRow.Cells[3] );
insert.Parameters.Add("#d",dataGridView1.CurrentRow.Cells[4] );
insert.Parameters.Add("#e",dataGridView1.CurrentRow.Cells[5] );
insert.ExecuteNonQuery();
Put this code inside your event and you're good to go. Your basics are very weak, focus on that else you'll always be stuck on very small errors.

How to add user defined row into a datatable?

I have datagridview which is filled with values from DB when button clicked.
All these happen based on a condition from radiobutton.
Now i need to add some extra row (default value) into the datatable, each time these conditions apply.
When button clicked and radiobutton condition apply,these codes will happen.
if (radioButton1.Checked == true)
{
string query = "SELECT type,priceS FROM service WHERE type='" + button5.Text + "'";
MySqlCommand cmd = new MySqlCommand(query, con);
dt.SelectCommand = cmd;
}dt.Fill(tt);
dataGridView1.DataSource = tt;
The query will return
string =type and int=priceS
from DB, i just need add string "S" with the "type" value
For example: if type = Style then in the datatable it be should "Style(S)"
any help is appreciated.

Instead of using Datatables i solved it in the MySQL Query itself
Query="Select Concat(type,'S'),price from service"
This will add the string S with that of the type's value.

C# Loop through DataGridView - MySqlDataReader stops after 2 Rows?

I'am having a hard time with C# ATM...
Its about this nasty piece of code here:
foreach (DataGridViewRow r in dgv_selectedOrders.Rows)
{
MessageBox.Show(r.Cells[0].Value.ToString());
order_id = r.Cells[0].Value.ToString();
query = "SELECT count(orders.id) AS total_orders FROM orders WHERE customer_id = (SELECT customer_id FROM orders WHERE id = " + order_id + ");";
command = new MySqlCommand(query, conn);
MySqlDataReader sda = command.ExecuteReader();
while (sda.Read())
dgv_selectedOrders[11,r.Index].Value = sda.GetInt32(0).ToString();*/
}
This loop is going through only twice and then it stops...
Interesting is, that when I uncomment everything execpt the "MessageBox" it nicely loops through each row and it displays every "order_id" of my DataGridView.
What it should do is:
Loop through existing DataGridView and get the "Order_id" from each row.
Then I want to count how many orders are already made by the customer and append the result in coulmn 11 of the DataGridView...
Any ideas?
As I said, it stops after the second row ...

Ok Guys,
so solution is pretty simple.
Just close the MySqlDataReader first -.-... lol
sda.Close();
after the while loop.
Cheers,

C# MySQL - "Update" is selecting every row/everything

My issue is that everytime I try to update in my CMS, it simply updates EVERY column / row.
For example:
I update Test 1 -> Test 2
Meanwhile I have Test 4
But then Test 4 -> Test 2 due to I changed Test 1 to 2 it simply changes that aswell.
They still work by ID correctly, and when I delete them, they delete individually, so the only function that is overlapping with everything is update.
I will now post my code (this is what I have learned, do not comment on security or w/e) simply need this issue fixed so it only updates the selected ID row.
First:
public DataRow GetById(string ID)
{
strSQL = "SELECT ID, clnOverskrift, clnTekst "
+ "FROM tblForside "
+ "WHERE ID=#ID";
objCMD = new MySqlCommand(strSQL);
objCMD.Parameters.AddWithValue("#ID", ID);
return objData.GetData(objCMD, objCon).Rows[0];
}
public void Update(PropertyForside Pro)
{
strSQL = "UPDATE tblForside SET "
+ " clnOverskrift=#Overskrift, clnTekst=#Tekst ";
objCMD = new MySqlCommand(strSQL);
objCMD.Parameters.AddWithValue("#Overskrift", Pro.Overskrift);
objCMD.Parameters.AddWithValue("#Tekst", Pro.Tekst);
objData.ModifyData(objCMD, objCon);
}
I will use both GetById and Update thats why I included both.
if you need to know more in this "factory" i will post it.
Here i get it:
FactoryForside fac = new FactoryForside();
PropertyForside Pro = new PropertyForside();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataRow dr = fac.GetById(Request.QueryString["ID"]);
txtOverskrift.InnerText = dr["clnOverskrift"].ToString();
txtText.InnerText = dr["clnTekst"].ToString();
}
}
protected void btnGem_Click(object sender, EventArgs e)
{
Pro.Overskrift = txtOverskrift.InnerText;
Pro.Tekst = txtText.InnerText;
Pro.ID = int.Parse(Request.QueryString["ID"]);
fac.Update(Pro);
Response.Redirect("RedigerForside.aspx");
}
I use InnerText to use TextAreas with NiceEdit.
Adding new ones work, and deleting as mentioned before - only this updating thing not working correctly.
It displays ID correctly "EditForside.aspx?id=13" in the browser, but it seems to select every other ID aswell
Hope you can help me.

Your UPDATE statement has to include a WHERE condition - the same you use in your select. Then it will update only that particular row. Without a WHERE it updates every row in the table.
Documentation: http://dev.mysql.com/doc/refman/5.0/en/update.html

The reason might be because you have not provided the where condition in your update clause. So if you dont provide a where condition in your update statement it would end up updating every row of your table.
Try something like this:
strSQL = "UPDATE tblForside SET "
+ " clnOverskrift=#Overskrift, clnTekst=#Tekst "
+ " WHERE ID=#ID";

You need to provide a WHERE clause in your update statement. E.g.
strSQL = "UPDATE tblForside SET "
+ " clnOverskrift=#Overskrift, clnTekst=#Tekst "
+ " WHERE ID=#ID";
This limits which rows will be updated.

SQL Update - Not updating multiple rows in a for loop

I have a DataGridView(DGV) linked to a SQlite database. I want to update some info on the DGV. So, I have a context menu that lets me change one column and update the DB as well. I want to have the ability to select multiple rows and edit as well. For ex: if i select five rows and change the type from alarms to errors ; the change is reflected in the DGV and then when i look into the database , the change isnt reflected. Only one row is updated.
My code snippet is below
foreach (DataGridViewRow r in dataGridView1.SelectedRows)
{
SQLiteTransaction SQLiteTrans = connection.BeginTransaction();
SQLiteCommand cmd = connection.CreateCommand();
MessageBox.Show(r.ToString());
if (r.Cells["typeDataGridViewTextBoxColumn"].Value.ToString().Contains("#") == false)
{
r.Cells["typeDataGridViewTextBoxColumn"].Value = r.Cells["typeDataGridViewTextBoxColumn"].Value.ToString() + " # " + max;
}
else
{
r.Cells["typeDataGridViewTextBoxColumn"].Value = r.Cells["typeDataGridViewTextBoxColumn"].Value.ToString().Substring(0, r.Cells["typeDataGridViewTextBoxColumn"].Value.ToString().IndexOf("#")) + "# " + max;
}
string querytext = "Update LogDatabase set Type = \"" + r.Cells["typeDataGridViewTextBoxColumn"].Value + "\" where HashKey = \"" + r.Cells["hashKeyDataGridViewTextBoxColumn"].Value.ToString() + "\"";
cmd.CommandText = querytext;
cmd.ExecuteNonQuery();
SQLiteTrans.Commit();
}
I dont have too much experience with SQL. So, im not sure if something is wrong with how ive updated the database!
What do i have to edit to make sure all the rows are updated in the DB as well?!
Help appreciated.
Edit: Tried checking the query before its sent.
When i try editing multiple rows in the DGV without sorting the DGV under any column it works and updates all the rows simultaneously... But When I try to sort them based on "Type" and then edit the rows, the same query is passed ! :| (Hash Key doesnt change)
Its like, the one row keeps moving up the list of rows and is always the row r in the for loop.
Edit 2: Its definitely a problem with the rows of the DGV
Everytime I sort the DGV and then try to edit the fields, the queries have hashkey values different from the once that i selected. Its like the row ids are changed completely after one update. It looks like the DGV automatically sorts once one row is updated !
Is there a way to disable this???!

It looks like you weren't increasing max counter.
foreach (DataGridViewRow row in dataGridView1.SelectedRows)
{
using (SQLiteTransaction SQLiteTrans = connection.BeginTransaction())
{
SQLiteCommand cmd = connection.CreateCommand();
MessageBox.Show(row.ToString());
var txtValue = row.Cells["typeDataGridViewTextBoxColumn"].Value;
if (txtValue.Contains("#"))
{
txtValue = String.Format("{0} # {1}", txtValue, max);
}else
{
txtValue = txtValue.SubString(0, txtValue.IndexOf("#")) + "# " + max.ToString();
}
string querytext = "Update LogDatabase set Type = #type where HashKey = #key";
//Create your SqlParameters here!
cmd.CommandText = querytext;
cmd.ExecuteNonQuery();
SQLiteTrans.Commit();
max++; //You weren't increasing your counter!!
}
}

Your problem is that you are using double quotes in your SQL query to delimit your string values. Replace them for single quotes:
string querytext = "Update LogDatabase set Type = '" +
r.Cells["typeDataGridViewTextBoxColumn"].Value +
"' where HashKey = '" +
r.Cells["hashKeyDataGridViewTextBoxColumn"].Value.ToString() +
"'";
Also, beware of SQL Injection. Your code is not dealing with that.