oledb

问题 Trying to write an SQL query where I'm using an inner join for getting data from one table and display matched contents in another table, however I receive the error 'Syntax error (missing operator) in query expression "'. Not sure where I'm going wrong with this, however I've inserted the code I'm using, and it looks correct to me. By the way, the code has been written as part of a VB program, hence the extra code beside the SQL code. Dim cmd As OleDbCommand = New OleDbCommand("SELECT * FROM

问题 I am trying to get data from Excel File to DataTable. Here's my code-snippet : FilePath = WebConfig.SavePath + "Book2.xls"; // Create the connection object OleDbConnection oledbConn = new OleDbConnection(WebConfig.ExcelConnection(FilePath)); // Open connection oledbConn.Open(); // Create OleDbCommand object and select data from worksheet Sheet1 //WebConfig.SheetNameFirstExcel OleDbCommand cmd = new OleDbCommand("SELECT * FROM [" + "Sheet1" + "$]", oledbConn); // Create new OleDbDataAdapter

问题 When I run this code it is also retrieving some other fields which are not present in the table. How can I overcome this? Dim conn As New OleDb.OleDbConnection 'Create a connection string for an Access database Dim strConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=F:\check\a.mdb" 'Attach the connection string to the connection object conn.ConnectionString = strConnectionString 'Open the connection conn.Open() Dim Restrictions() As String = {Nothing, Nothing, selected,

问题 We have a client/server application that consists of multiple EXEs. The data access layer is on the same physical tier as the client in a library shared by our EXE modules. ODBC and OleDB connection pools are managed per-process; are there techniques for sharing DB connections across processes (other than moving the data access layer to a middle tier)? 回答1: Database connections in OLEDB and ODBC are intrinsically process bound. At the lowest levels, a sql server database connection is using

问题 The code is below. in my code I updating existing row(from existing table) that the program get all the updated values from textBoxes. there is at the end(the last column)of the table autoNumber field which is named as "codonsAutoNum" I don't know how to get the value (autonumber value) from the databese. I need the value in the position (in the code) where there is '??'. thank you all for your help! the code: private void update_Click(object sender, EventArgs e) { string connectionString =

问题 This is my connection to an access database in .NET: OdbcConnection conn = new OdbcConnection("Driver={Microsoft Access Driver (*.mdb)};Dbq=" + path + "\\Access.mdb;Uid=;Pwd=;"); And I got this problem: base {System.Data.Common.DbException} = {"ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified"} I have tried couple of database connection strings from here: http://www.connectionstrings.com/access but none of them working. Any suggestions

问题 I'm importing data from a CSV that contains approx 350 columns. This CSV import is fixed and I have absolutely no control over it. If I attempt to open the CSV in Excel 2003, it only partially loads due to the column limit of 255 (IV). When I load the CSV into a DataSet using OleDb and Microsoft.Jet.OLEDB.4.0 it also only shows 255 columns. Worse still though, when attempting to access the data for some of these 255 columns it shows incorrect data and is splitting up the values incosistently.

问题 I'm attempting to take Excel 2003 and connect it to SQL Server 2000 to run a few dynamicly generated SQL Queries which ultimately filling certain cells. I'm attempting to do this via VBA via ADO (I've tried 2.8 to 2.0) but I'm getting an error while setting the ActiveConnection variable which is inside the ADODB.Connection object. I need to resolve this pretty quick... Requested operation requires an OLE DB Session object, which is not supported by the current provider. I'm honestly not sure

问题 I'm attempting to take Excel 2003 and connect it to SQL Server 2000 to run a few dynamicly generated SQL Queries which ultimately filling certain cells. I'm attempting to do this via VBA via ADO (I've tried 2.8 to 2.0) but I'm getting an error while setting the ActiveConnection variable which is inside the ADODB.Connection object. I need to resolve this pretty quick... Requested operation requires an OLE DB Session object, which is not supported by the current provider. I'm honestly not sure

问题 how to install mysql oledb driver in local system. please give Mysql oledb Connection string 回答1: Provider=OleMySql.MySqlSource.1 回答2: .NET Solution (c#) You need to install MySql.Data using Package-Manager... PM>Install-Package MySql.Data Then, in your c# code do something like this.. using System.Data.OleDb; using System.Data.Common; using MySql.Data.MySqlClient; DbProviderFactory factory = new MySqlClientFactory(); DbConnection cxn = factory.CreateConnection(); cxn.ConnectionString =