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Old October 8th, 2006, 03:16 AM
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Default UPDATING DATABASE (OLEDB)

Hi All,

Im new to asp.net programming and Im trying to write a simple program to udpate a database using microsoft access. I have consulted different books, and tried different solutions, but I always encounter this error.. "OPERATION MUST USE UPDATABLE QUERY".

Dim connectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0; " & _
  "Data Source=C:\microcell.mdb"
  Dim dbConnection As New OleDbConnection(connectionString)

 dbConnection.Open()

       Dim commandString As String = "INSERT INTO Employees(FirstName, LastName) " & _
 "Values(@FirstName, @LastName)"

        Dim dbCommand As New OleDbCommand(commandString, dbConnection)
        Dim firstNameParam As New OleDbParameter("@FirstName", OleDbType.VarChar, 10)
        firstNameParam.Value = txtfirstname.Text
        dbCommand.Parameters.Add(firstNameParam)
        Dim lastNameParam As New OleDbParameter("@LastName", OleDbType.VarChar, 20)
        lastNameParam.Value = txtlastname.Text
        dbCommand.Parameters.Add(lastNameParam)

            dbCommand.ExecuteNonQuery()
            dbConnection.Close()

 
Old October 8th, 2006, 10:01 AM
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Default

IMHO, I hate paramertized queries because you can only use them for a specific task, in this case inserting a firstname and lastname into a database. What I do in all of my applications is I write a wrapper class that handles all of my database connectivity for ANY sql statement that I pass in (usually I just call a stored procedure). In any case something like this may work for you.

private SqlDataAdapter daSql;
private SqlCommand sqlCmd;
private sqlDataReader sqlDataReader;
private SqlConnection sqlConn;

public void writeUpdate(string strSQLcmd)
{
 sqlConn = new SqlConnection();
 sqlConn.ConnectionString = <connection string>
 sqlConn.Open();
 sqlCmd = new SqlCommand(strSQLcmd, sqlConn);
 sqlCmd.CommandTimeout = 3800;
 sqlDataReader = sqlCmd.ExecuteReader();
 sqlDataReader.Close();
 sqlConn.Close();
 sqlDataReader = null;
 sqlConn = null;
}

That method is designed to handle queries that dont return a result set (eg UPDATE, DELETE or INSERT statements) what you would do in code is this

string sSQL;
sSQL = "INSERT INTO table(value1)values(somevalue)";
writeUpdate(sSQL)

Of course you will need to change your object to OLEDB objects but the general idea is still the same.

hth

--Stole this from a moderator

I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
 
Old June 19th, 2007, 09:10 AM
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Default

... I am getting the same problem when executing a simple update query from Access VBA and am also struggling to locate the solution. In my code, the query is executed direct (and not parameterized).

UPDATE utility set appversion = '5.10.46'

Any ideas?

Regards,

Sean Anderson





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