It seems like i do connect to my database judging by no error messege after executing the code but i'm unable to do INSERT INTO command even though it works if i copy the code to sql server command line client. What did i do wrong ?
This is my code
Maybe some code is off the bottom of the screen there but, you will need to execute the command. Something like:
cmd.ExecuteNonQuery();
Also, before doing that you should indicate that it's a text command
cmd.CommandType = System.Data.CommandType.Text;
Okay so i've actually solved it, thanks comment above for helping me at least slightly. After i posted your code it didn't work but when i moved it under the open like that :
private void Form1_Load(object sender, EventArgs e)
{
con = new MySql.Data.MySqlClient.MySqlConnection();
con.ConnectionString = myConnectionString;
MySqlCommand cmd = con.CreateCommand();
try
{
con.Open();
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
MessageBox.Show(ex.Message);
}
cmd.CommandText = "INSERT INTO DaneRecepcjonistki VALUES('123', 'Kot', 'Pies');";
cmd.CommandType = System.Data.CommandType.Text;
cmd.ExecuteNonQuery();
} It works !
Thanks !
Related
i am testing my sqlite local server with c#, I have the connection and query setup without problem. I tried to copy the query to sqlite and it runs without problem. However, when I run it in my program, nothing insert into the db. Wondering what the problem is.
I have set the db build action to Content, and the copy to output directory options to copy if newer
private void insertIntoDB(string query)
{
using (System.Data.SQLite.SQLiteConnection conn = new System.Data.SQLite.SQLiteConnection("data source=.\\VHTDatabase.db"))
{
using (System.Data.SQLite.SQLiteCommand cmd = new System.Data.SQLite.SQLiteCommand(conn))
{
conn.Open();
Console.WriteLine(query);
cmd.CommandText = query;
cmd.ExecuteNonQuery();
conn.Close();
}
}
}
Try a full path to your database in your Connectionstring
Then maybe try to add the CommandText before you open the Connection.
i mean:
cmd.CommandText = query;
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
Does your database give you informations with SELECT?
Maybe you need to reconfigure the User of the Database and give him rights to write, change and delete.
If nothing helps, then you can check, if it gives you an error.
try
{
cmd.CommandText = query;
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
}
catch(Exception ex)
{
Console.WriteLine(ex);
}
I have written this query in c# , query syntax is OK, query is also receiving parameter values as I have checked using breakpoints and also same query is working in SQL server management studio, but in visual studio it does not gives any error but also does not delete item from table.
private void deleteItem(int itemId, int saleId)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand deleteItem = new SqlCommand(
"Delete FROM items_in_sales WHERE sale_id=#sale_id AND item_id=#item_id",
conn);
deleteItem.Parameters.AddWithValue("#sale_id", itemId);
deleteItem.Parameters.AddWithValue("#item_id", saleId);
try
{
conn.Open();
deleteItem.ExecuteNonQuery();
conn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
please help.
Fix your parameters they are wrong way around
deleteItem.Parameters.AddWithValue("#sale_id", itemId);
deleteItem.Parameters.AddWithValue("#item_id", saleId);
should be
deleteItem.Parameters.AddWithValue("#sale_id", saleId);
deleteItem.Parameters.AddWithValue("#item_id", itemId);
i want to delete data in my database and using this code but its now working
private static void DeletePreviousRecord()
{
string connectionString = "Data Source=ABDULLAH\\ABDULLAHZAFAR;Initial Catalog=FoodHunt;Integrated Security=True";
using (SqlConnection con = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand("Delete From RestaurantsMenu", con))
{
try
{
cmd.CommandType = CommandType.StoredProcedure;
con.Open();
var result = cmd.ExecuteNonQuery();
con.Close();
}
catch (Exception ex)
{ }
}
}
}
i tried this but this is not working, how can i do that, any suggestion?
Setting the CommandType to StoredProcedure when you clearly use a sql text directly cannot do any good at your code.
Remove that line because the default is CommandType.Text (and this is correct for your command)
But as stated in the comment above.
If you catch the exception, at least write in some log or display at
video what the error message is
If you don't add a WHERE clause at your sql statement, you delete
everything in the table (Probably you are lucky that this code has
not worked)
Looking at your comment below, if you want to delete every record (and reset the Identity column if any) a faster approach is
using (SqlCommand cmd = new SqlCommand("TRUNCATE TABLE RestaurantsMenu", con))
For a quick reading about the difference between TRUNCATE and DELETE look at this article
I've got this code:
using (SqlCeConnection sqlConn = new SqlCeConnection(#"Data Source=\my documents\\PlatypusDB.SDF"))
{
sqlConn.Open();
string dmlStr = "insert into platypus_settings (setting_name, setting_value) values(?, ?)";
SqlCeCommand cmd = new SqlCeCommand(dmlStr, sqlConn);
cmd.CommandType = CommandType.Text; //<-- necessary?
cmd.Parameters[0].Value = settingName;
cmd.Parameters[1].Value = settingVal;
try
{
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
Platypus.ExceptionHandler(ex, "writeSettingsVal");
}
}
...but don't know if the commented line is needed, is bloatcode, or doesn't matter either way?
... but don't know if the commented line is needed
No. Not because it's obvious but because it happens to be the default.
From MSDN:
Property Value
One of the CommandType values. The default is Text.
Having said that, it certainly is not bloat-code and I might include it, just to make the code a little less ambigious to read.
I am trying to access an Access 2003 database remotely from my ASP.NET application. My code is:
DataSet dsImportedData = new DataSet();
System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection();
conn.ConnectionString = #"Provider=MS Remote;Remote Provider=Microsoft.Jet.OLEDB.4.0;Remote Server=http://myIp;Data source=C:\myDatabase.mdb;";
try
{
System.Data.OleDb.OleDbCommand command = conn.CreateCommand();
command.CommandText = "SELECT * FROM myTable";
conn.Open();
System.Data.OleDb.OleDbDataAdapter adapter = new System.Data.OleDb.OleDbDataAdapter(command);
adapter.Fill(dsImportedData);
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
However, I am always getting an exception stating: {"[Microsoft][ODBC Microsoft Access Driver] Invalid SQL statement; expected 'DELETE', 'INSERT', 'PROCEDURE', 'SELECT', or 'UPDATE'."}
My command is basic, I have no idea what could be wrong with it. Did anyone confront with the same issue? Thanks!
Try this ....
String command = "SELECT * FROM myTable";
conn.Open();
System.Data.OleDb.OleDbDataAdapter adapter = new System.Data.OleDb.OleDbDataAdapter(command, conn);
adapter.Fill(dsImportedData);
Apparently the error can be caused by the specified table not existing. Just a thought...
Another thought would be to remove the remoting complexity and try to get to the most simple working code, possibly with a new access database just to start to narrow down what is causing the problem.
If you set the command type to Stores procedure it works for me.
command.CommandType = System.Data.CommandType.StoredProcedure;