I am connecting to the MS Access server with the following code.
Dim cnn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=162.222.225.78;Database=CRM.mdb;Integrated Security=SSPI;User ID=corpopef;Password=********;")
Dim cmd As New OleDb.OleDbCommand
If Not cnn.State = ConnectionState.Open Then
cnn.Open()
End If
cmd.Connection = cnn
cmd.CommandText = "INSERT INTO Addressbook(srno) " & _
"VALUES('" & Me.TextBox1.Text & "')"
cmd.ExecuteNonQuery()
But it results in the following error:
"Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done."
Please suggest to me some methods to work around this problem.
Thanks in advance...!
The connection string you used seems like an SQL client connection string. For an access database, you should use this format:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=path_to_mdb_file\CRM.MDB;User Id=user_id; Password=password;
Related
I have successfully managed to use SELECT and DELETE SQL statements and now I am trying to use INSERT INTO. However I keep getting this error:
ExecuteNonQuery requires an open and available Connection. The
connection's current state is closed.
So I tried putting con.Open() to see if that would help and I got this error:
The ConnectionString property has not been initialized.
I was wondering if anyone knows what I have done wrong. Or just if anyone has any working code. Preferably I would like to not use parameters if that is possible because I don't understand them at all. Here is my SQL code:
Dim con As OleDb.OleDbConnection
Dim comm As OleDb.OleDbCommand
con = SQLConnect()
comm = New OleDb.OleDbCommand()
comm.CommandText = "INSERT INTO " & TableName & " (" & Column & ") VALUES (" & Value & ")"
comm.Connection = con
comm.ExecuteNonQuery()
con.Close()
Here is the connection code:
Public Function SQLConnect() As OleDb.OleDbConnection
If Connector.State = ConnectionState.Open Then
dbprovider = "PROVIDER=Microsoft.ACE.OLEDB.12.0;"
dbsource = "Data Source = NEA.accdb"
Connector.ConnectionString = dbprovider & dbsource
Connector.Open()
End If
Return Connector
End Function
Use one open connection and one close connection like this:
Open the connection
Execute all your DELETE and INSERT queries.
Close the connection.
Try this:
con.Open()
comm.Connection = con
comm.CommandText = "DELETE ..."
comm.ExecuteNonQuery()
comm.CommandText = "INSERT INTO " & TableName & " (" & Column & ") VALUES (" & Value & ")"
comm.ExecuteNonQuery()
con.Close()
BTW, I recommend that you use parameters instead of string concatenation on your sql query. To avoid sql injection.
I have already posted one question about this piece of code before lol. But now I am having a different problem and need help with it. Basically this is code for a search button on a Windows Form coded in VB.NET.
Private Sub SearchButton_Click(sender As Object, e As EventArgs) Handles SearchButton.Click
Dim cnnOLEDB As New OleDbConnection
Dim cmdOLEDB As New OleDbCommand
Dim strConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & System.Environment.CurrentDirectory & "\All Keyed Up, Lock & Safe, LLC.accdb"
cnnOLEDB.ConnectionString = strConnectionString
cnnOLEDB.Open()
Dim Connection As New SqlClient.SqlConnectionStringBuilder
Connection.DataSource = "file:///C:\Users\thelukester145\Documents\All%20Keyed%20Up\All%20Keyed%20Up,%20Lock%20&%20Safe,%20LLC.accdb"
Dim objSQLConnection = New SqlClient.SqlConnection(Connection.ConnectionString)
Dim cmd As New SqlCommand()
Dim myTable As New DataTable()
Dim SearchFor = SearchBox.Text
If AddressButton.Checked Then
cmd.Connection = objSQLConnection
cmd.CommandText = "SELECT * FROM [McDonald's-Corporate Stores] WHERE [Address] LIKE '%" & SearchFor & "%'"
Dim myAdapter As New SqlDataAdapter(cmd)
myAdapter.Fill(myTable)
DataGrid.DataGridView1.DataSource = myTable
ElseIf NumberButton.Checked Then
cmd.Connection = objSQLConnection
cmd.CommandText = "SELECT * FROM [McDonald's-Corporate Stores] WHERE [McOpCo#] LIKE '%" & SearchFor & "%'"
Dim myAdapter As New SqlDataAdapter(cmd)
myAdapter.Fill(myTable)
DataGrid.DataGridView1.DataSource = myTable
End If
DataGrid.Show()
cnnOLEDB.Close()
End Sub
The database that is attempting to be searched is a database of customers for our family buisness. I am trying to search by either the address or store number of our customer. I've worked through who knows how many fatal errors but the newest one has me sort of stumped. It is crashing on myAdapter.Fill(myTable). The error message it gives is this:
An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid)
Any help would be much appreciated :)
Well, you are freely mixin OleDb classes with SqlClient classes. The two are for different database types. OleDb is needed for Access, SqlClient classes are used for Sql Server.
So you need to change all the classes SqlCommand, SqlCommandBuilder, SqlDataAdapter,SqlConnectionStringBuilder with the corresponding classes OleDbCommand, OleDbCommandBuilder, OleDbDataAdapter, OleDbConnectionStringBuilder
Infact, the error message is emitted by the SqlClient library that tries to use your connection string as it was a connectionstring for an SQL Server database and, of course, it fails to find it.
Also, I am not sure about that, but probably the DataSource property doesn't need the prefix file:/// and the Encoding of spaces with %20
super new to Visual Studios and i need some help with regards to connection to database.
I only have visual studios 2012 installed.
So I'm trying to create a simple sign up form, and storing the information into a table(created a local database for this with the table 'Users'.)
The problem is:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or is not accessible. Verify that the instance name is correct and that SQL Server name is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified.)
Er, so what should I do? :(
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim con As New SqlConnection
Dim cmd As New SqlCommand
Try
con.ConnectionString = "Data Source=|DataDirectory|\Database1.sdf;"
con.Open()
cmd.Connection = con
Dim sha1 As SHA1 = sha1.Create()
Dim password As Byte() = sha1.ComputeHash(Encoding.Unicode.GetBytes(password1.Text))
cmd.CommandText = "INSERT INTO users (username,password) VALUES('" & username1.Text & "','" & password1.Text & "');"
cmd.ExecuteNonQuery()
Catch ex As Exception
MessageBox.Show("Error : " & ex.Message, "insert data")
Finally
con.Close()
End Try
Thanks guys.
EDIT:
Sad to say , I dont have any SQLExpress here in my laptop. so Yeahhh.
This might happen due to the SQLExpress has been stopped...Try to start it manually by going to services
ok first ill explain what ive done.
First I imported an access db into my vb app it then named the dataset etc.
this is how my dataSet looks:
1 table
4 columns
so Far i have this:
Dim ds As ElementsDataSet
Dim dt As ElementsDataSet.ElementsDataTable
Dim conn As SqlConnection = New SqlConnection("Data Source=|DataDirectory|\Elements.accdb")
Dim selectString As String = "Select Atomic Mass FROM Elements WHERE No =" & mol
Dim cmd As New SqlCommand(selectString, conn)
If conn.State = ConnectionState.Closed Then conn.Open()
Dim datareader As SqlDataReader = cmd.ExecuteReader()
While datareader.Read = True
MessageBox.Show(datareader.Item("Atomic Mass"))
End While
datareader.Close()
and upon executing this I get this error:
An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
The problem is you are using a SQLConnection to open a Access database. This wont work.
You either need a SQLServer database or to use the OleDbConnection for a Access database.
Here is a Microsoft KB article to help you connect to the Access database:
How To Retrieve and Display Records from an Access Database by Using ASP.NET, ADO.NET, and Visual Basic .NET and this one over at CodeProject: http://www.codeproject.com/Articles/8477/Using-ADO-NET-for-beginners
Private Sub ReadRecords()
Dim conn As OleDbConnection = Nothing
Dim reader As OleDbDataReader = Nothing
Try
conn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Temp\Elements.accdb"))
conn.Open()
Dim cmd As New OleDbCommand("Select Atomic Mass FROM Elements WHERE No =" & mol, conn)
reader = cmd.ExecuteReader()
While reader.Read = True
MessageBox.Show(reader.Item("Atomic Mass"))
End While
Finally
If reader <> Nothing Then
reader.Close()
End If
If conn <> Nothing Then
conn.Close()
End If
End Try
End Sub
I have put my tns connection into the .ora file and am now able to conenct to it using SQL plus and can ping it :tnsping myConn.
I've also added the connection to the ODBC Manager and connecting successfully when tetsing conneciton through the ODBC tool.
now i'm having an issue making a connection to it using vb.net
i've tried the following:
oODBCConnection = New Odbc.OdbcConnection(connStr)
oODBCConnection.Open()
where my connStr is:
Data Source=tns.dev;User Id=MyUser;Password=MyPass;
per: http://www.connectionstrings.com/oracle and http://www.shabdar.org/c-sharp/101-connect-to-oracle-using-asp-net-and-csharp.html
what am i doing wrong? it's telling me i need to specify a driver, how do i do it?
Thank you!
the error i'm getting is:
ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
Did you checked the tnsnames.ora file? Is there any entry for tns.dev?
http://www.mike-devlin.com/oracle/tnsnames_ora.htm
That is not an oracle error - it sounds like you did not create a system dsn. This code looks like it expects a DSN by name of tns.dev.
That said, I would not use odbc if I could help it. You might want to look at Oracle Data Provider for .net
http://www.oracle.com/technetwork/topics/dotnet/index-085163.html
ODBCConnection was incorrect.
solution:
Dim myConnection As OleDbConnection
Dim myCommand As OleDbCommand
Dim myConnection As New OracleConnection(connStr)
myConnection.Open()
I´ve been using the following code in Vb.net
Dim conn As New Odbc.OdbcConnection
Dim cmd As New Odbc.OdbcCommand
Dim drResult As Odbc.OdbcDataReader
Dim connString As String
Dim QuerySQL As String
connString = "Driver={Microsoft ODBC for Oracle};CONNECTSTRING=(DESCRIPTION=(ADDRESS= (PROTOCOL=TCP)(HOST=ORACLEDB01)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORACLE_INSTANCE_NAME)));Uid=john;Pwd=mypassword;"
QuerySQL = "select first_name, last_name from employees where id = 28"
conn.ConnectionString = connString
conn.Open()
cmd.Connection = conn
cmd.CommandText = QuerySQL
drResult = cmd.ExecuteReader()
While drResult.Read
TextBox1.Text = TextBox1.Text & drResult("last_name") & ", " & drResult("first_name") & Environment.Newline
End While
drResult.Close()