I haven been trying to figure this out all day and just couldn't find my mistake. I have an ms-access database and a c# program that is supposed to update the data in the db. Unfortunately I keep getting System.Data.OleDb.OleDbException: Syntaxerror in update statement.
I am using OleDbConnectionand OleDbDataAdapter and everything (except for one column) was working perfectly. I couldn't figure out why I kept getting the above mentioned error for that column (it was formatted just like the others -> text), so I deleted the column and created it again. Now I get the error for every single alteration I try to make.
public void changeFields(string id, string name, string famName, string department) {
DataSet myDS = new DataSet();
using (OleDbConnection conn = new OleDbConnection(connectionString)) {
conn.Open();
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter.SelectCommand = new OleDbCommand("SELECT * FROM Table WHERE ID = '"+ id +"', conn);
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
myDS.Tables["Table"].Rows[0]["Name"] = name;
myDS.Tables["Table"].Rows[0]["FamilyName"] = famName;
myDS.Tables["Table"].Rows[0]["Department"] = department;
adapter.Update(myDS, "Table");
conn.Close();
}
}
The names of the columns are correct and if I
Console.WriteLine(myDS.Tables["Table"].Rows[0]["Name"];
right before I try to update.
I actually get the correctly changed version. The error always occurs for line adapter.Update();
Is it possible that access rearranges or messes some index up when I insert a column into the database?
Help would be very much appreciated
I figured it out! The problem was that I had a reserved keyword as a column name. Now it all works perfectly fine
Related
Hi I am currently making a budgeting program for a school project and am having trouble with inputting a string converted from the SQLite table it is connected to externally. Here is my code:
'''
public entGlobalBUD()
{
InitializeComponent();
SQLiteConnection sqlConnection = new SQLiteConnection();
sqlConnection.ConnectionString = "DataSource = SubjectTable.db";
//Deifine a SELECT statement
string commandText = "SELECT * FROM SubjectTable";
//Create the data table
DataTable datatable = new DataTable();
//Create SQLiteDataAdapter
SQLiteDataAdapter myDataAdapter = new SQLiteDataAdapter(commandText, sqlConnection);
sqlConnection.Open();
myDataAdapter.Fill(datatable);
sqlConnection.Close();
dataGridView1.DataSource = datatable;
budgetBox.Text = dataGridView1.SelectedRows[23].Cells[5].Value.ToString();
}
'''
The last line is the one causing the problem as if removed the program runs fine but leaves the Budget Box empty. With this last line in the code the program will not run. After debuggin the problem occurs because the 'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index' my table is 24x6 and still fails even if something like [2], [2] is inputted.
Any help would be greatly appreciated!
managed to solve it through a bit more research. Wasmy mistake needed to replace the last line of
budgetBox.Text = dataGridView1.SelectedRows[23].Cells[5].Value.ToString();
to
budgetBox.Text = dataGridView1.Rows[23].Cells[5].Value.ToString();
Hopefullly this helps if anyone comes across something similar in the future.
I have a functioning stored procedure which returns the correct data when executed manually. There are several rows of data in the output. However, the following code I have is always resulting in no rows of data being added to the DataTable.
var commandString = string.Format(#"EXEC MyStoredProcedure {0}", SomeParameter);
var dataTable = new DataTable();
using (var connection = new SqlConnection(ConnectionString))
{
connection.Open();
using (var adapter = new SqlDataAdapter(commandString, ConnectionString))
{
using (new SqlCommandBuilder(adapter))
{
adapter.Fill(dataTable);
adapter.Update(dataTable);
}
}
}
var result = (from DataRow row in dataTable.Rows
select new MyModelClass
{
SomeString = (string) row["SomeString"],
SomeValue = (string) row["SomeValue"],
}).ToList();
Debug.WriteLine("Results: " + result.Count);
I am not sure why the code is resulting in no rows of data. Where am I going wrong? I suspect it is because I have an incorrect understanding of how DataTable works. How should I fix the code?
Basically, your code should look something like this:
string ConnectionString = "<Your connection string here>";
string procedureName = "<your stored procedure name here>";
string ParamName = "#<Parameter name>"; // NOTE: the '#' is INSIDE the string!
DataSet ds = new DataSet();
using (var connection = new SqlConnection(ConnectionString))
{
var cmd = new SqlCommand(procedureName, connection);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(ParamName, SqlDbType.Int).Value = 5;
using (var adapter = new SqlDataAdapter(cmd))
{
adapter.Fill(ds);
}
}
Sorry to be late to the party but I just want to confirm something.
I noticed that in the OP the asker uses the adapter to fill a DataTable
In the accepted answer, however, the adapter is used to fill a DataSet
Well, that's great - I also discovered this myself. The DataTable will contain 0 rows ase well as 0 columns, but use it to fill a DataSet instead, and it works fine.
So the real question here is: Why does it work with a DataSet when it doesn't with a DataTable?
I have a suspicion and I'm really here to try and prove it right or wrong. In my case I found that the SP started returning this weird empty DataTable as soon as my SP contained anything like a DELETE or an INSERT. In my case, where the original SP was just a simple SELECT from some data, I had to add some complexity which meant I first had to populate a Table Variable using INSERTs, and then SELECT from that. And that's when I ran into this problem.
So, #user9993, if you're still around can you just tell me.... does your SP do more than just SELECT? Does it do updates or deletes even if it's just to something like a Temporary Table or a Table Variable?
I have this code where I put data to the DataTable from where I show everything on DataGridView.
But when I look it contains information which supposed to be in file but its repeated twice.
Code to retrieve data from mysql database:
MySqlDataAdapter mySqlDataAdapter;
DataSet DS0 = new DataSet();
DataTable DT0;
string gender;
private void Filter()
{
ViewG.DataSource = null;
ViewG.Rows.Clear();
command.CommandText = "SELECT * FROM `table2` WHERE s1q2 = #gender";
command.Parameters.Add("#gender", MySqlDbType.VarChar);
command.Parameters["#gender"].Value = gender;
DT0 = DS0.Tables.Add("1Filter");
mySqlDataAdapter = new MySqlDataAdapter(command.CommandText, connection);
connection.Open();
mySqlDataAdapter.SelectCommand = command;
mySqlDataAdapter.Fill(DS0.Tables["1Filter"]);
ViewG.DataSource = DS0.Tables["1Filter"];
connection.Close();
}
Initially, on the start it retrieves all information from the database code (SELECT * FROM table) and displays on the DataGridView. And it works fine, but when I try to use filters to retrieve only for example "Females" problem occurs.
For full data I use:
mySqlDataAdapter.Fill(DS0.Tables["Full"]);
ViewG.DataSource = DS0.Tables["Full"];
For Filtered data:
mySqlDataAdapter.Fill(DS0.Tables["1Filter"]);
ViewG.DataSource = DS0.Tables["1Filter"];
If I run query used for filter on the application startup it does not duplicate and show correctly.
EDIT: SOLVED
From the code posted here, gender string is not assigned any value. So, your query be applying any filter that you want.
Thanks for you effort I found where the problem was. I used temp table on MySql and for some reason server did not dropped this table after connection is closed. So on the new query it added same items on the same table....
I have a following query to display Student data in dataGridView, but it doest seems to display any records at all. My code:
public void setSQL()
{
string ConnStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\jasper\\Desktop\\AutoReg\\AutoReg.accdb;";
OleDbConnection MyConn = new OleDbConnection(ConnStr);
MyConn.Open();
DataSet ds = new DataSet();
//query to ask
string query = "SELECT * FROM Student";
using (OleDbCommand command = new OleDbCommand(query, MyConn))
{
using (OleDbDataAdapter adapter = new OleDbDataAdapter(command))
{
adapter.Fill(ds);
dataGridView1.DataSource = ds;
MyConn.Close();
}
}
}
edit: After seeing the comment I noticed my error. I was assuming a web application.
You should use a DataTable as a data source, not a DataSet. Set the data source property to the first table in the DataSet's tables collection.
In truth, you can use a DataSet, but it's not so straightforward. It does allow the user to change the table she's seeing, though.
Couple of things you can check.
Are you sure you have entries in this table?
Try commenting out the part about the OleDbDataAdapter, use a DataReader instead so you can step through and see if there are rows being returned.
if you are getting rows in your datareader, then it may have to do with your datagrid set up. Are you using autogenerate columns? If not, are the columns set up correctly?
Instead of:
dataGridView1.DataSource = ds;
Try this:
dataGridView1.DataSource = ds.Tables[0];
I am trying to populate some text boxes on a form with data pulled from MySQL into a data set.
I cant seem to get the code right and could use some help
string ConnectionString = ConfigurationSettings.AppSettings["ConnectionString"];
MySqlConnection connection;
MySqlDataAdapter adapter;
DataTable DTItems;
connection = new MySqlConnection(ConnectionString);
try
{
//prepare query to get all records from items table
string query = "select * from spt_proposal where fr_Numer = "+ a+"";
//prepare adapter to run query
adapter = new MySqlDataAdapter(query, connection);
DataSet DS = new DataSet();
//get query results in dataset
adapter.Fill(DS);
textBox5.Text = DS.Tables[0].Rows[0].ToString();
This does not hit the text box at all.
a in the query is a variable that is pulled from a different form
and the query should pull 32 different things from the database in a row
There are about 9 text boxes on the form that i will have to fill with different data from this row.
Anyone have a better way to do this?
Brent
Try:
textBox5.Text = DS.Tables[0].Rows[0][0].ToString();
Remember, that a Table is pretty much a two dimensional array. Your code literally gets to the 1st row in the DataSet, but doesn't take into account the Column.