oledbconnection

问题 This code does not save any data in the dbf file. What is wrong here? Here is the code with the recommended changes. Thank you. string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\TEMP;Extended Properties=dBase IV"; using (OleDbConnection connection = new OleDbConnection(connectionString)) using (OleDbCommand command = connection.CreateCommand()) { connection.Open(); command.CommandText = @"CREATE TABLE TEST (Id Text, Changed Text, Tacos Text)"; command.ExecuteNonQuery

问题 So far I have managed to get the column names of the whole excel file, but what I would like to do is to get the column names of the excel file of a given table (sheet). How could I modify the code to achieve this. I have been trying for a while now with no positive results, any help much appreciated. public static List<String> ReadSpecificTableColumns(string filePath, string sheetName) { var columnList = new List<string>(); try { var excelConnection = new OleDbConnection("provider=Microsoft

问题 I am reading the excel file using C# and below is the code which is working as expected EXCEPT that every time i run the app, I have to close the excel file otherwise I get the below error message: The Microsoft Access database engine cannot open or write to the file ''. It is already opened exclusively by another user, or you need permission to view and write its data.. my question is: is there a way i close the excel file once i am done reading? public static DataTable LoadExcelWorkbook

问题 I am getting an error while inserting data into a database. The error is: "Number of query values and destination fields are not the same". Insert code: OleDbConnection vconn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Mutyyba\\Documents\\Database1.accdb"); vconn.Open(); string name = textBox1.Text; string address = textBox3.Text; int rollno = Convert.ToInt32(textBox2.Text); string vquery = "insert into Table1 values(@vname,@vrollno,@vaddress)";

问题 Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine. and Microsoft.JET.OLEDB.4.0' provider is not registered on the local machine. are both errors for me. I've been trying both while trying to create an Access connection. I'm not sure what to do anymore. I have 32 bit office on a 64 bit machine. I found solutions where they said to install the Access Database Engine but it won't let me install 64 bit with 32 bit office. Another source mentioned to bypass this you can go

问题 In my current project, the database name keeps changing and I do not want to modify my OLE DB Sources each time. Thus I want to set it as a variable. That is, in each OLE DB Source, I could use it as a parameter. However, it seems SSIS doesn't allow database name to be transferred as a parameter. So what should I do to minimize my changes? I wish to do something like this SQL statement in OLE DB Source: Select OrderID From ?.Order And I just need to modify my variable when the database name

问题 Apparently (MSDN) sometimes OleDbConnection.ResetState() does nothing, so even if the connection fails OleDbConnection.State will still be set to Open. I am looking for best workaround for this, so that when I check connection state I can avoid raising exceptions (as long as connection hasn't failed between the last check and usage attempt). Is there nothing better than sending a "useless" sql statement each time just to see if an exception is thrown? How do you make sure your connection is

问题 I created xlsx file using standarts of Open Xml SDK. While opening it in excel everything works perfect. My problem is that I cannot open that created file using OleDbConnection, but others not created xlsx file OleDB can open as well. Will be glad for any help. 来源： https://stackoverflow.com/questions/29428208/read-using-oledbconnection-created-xlsx-file-using-open-xml-sdk

问题 I have an asp.net C# application where i am reading the contents of a spreadsheet using OLEDBConnection. I am using the below line of code to read from the excel spreadsheet. OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fullFilePath + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'"); One of my column has data in various formats like strings,numbers,date etc in various rows.When running this ,When the data format is different,its not reading

问题 I have created a sample app by using both the oledb provider(SQLOLEDB and SQL Native OLEDB provider). Case 1 : Provider = SQLOLEDB hr = ::CoInitializeEx(NULL, COINIT_MULTITHREADED); hr = cADOConnection.CreateInstance(__uuidof(Connection)); CString con_string = "provider=SQLOLEDB;server=MYPC;Database=MyDB"; CString SSlcon_string = "provider=SQLOLEDB;Encrypt=true;TrustServerCertificate=true;server=MYPC;Database=MyDB"; CString userName = "sa"; CString Password = "sa"; BSTR bsConnection = /*con