oledb

问题 In the application we have a wizard with multiple tabs. On the first tab we can select a excel sheet path using a browse button. The moment you select the excel, excel file contents are loaded in a dataset (everything in correct format including DATE fields). Then click Next to go to the next wizard tab. But if the file is open program loads the excel and this time with all the date fields in General format. eg: 6/22/2006 as 38890 We are trying to find if the excel is open or being used by

问题 Hi everyone I'm trying to extract a lot of records from a lot of joined tables and views using SSIS (OLE DB SOURCE) but it takes a huge time! the problem is due to the query because when I parsed it on sql server it takes more than hour ! Her's my ssis package design I thought of paralleled extraction using two OLE DB source and merge join but it isn't recommended using it! besides it takes more time! Is there any way to help me please? 回答1: Writing the T-sql query with all the joins in the

问题 I'm using OleDBCommand to select some data in an Excel sheet I have. I have One column that has lists of data (column J) and every column after that either (columns K - AG) has a 1 or 0 depending on a relationship. So it's basically a graph plotted with 1 or 0. I want to use a SQL command to select every entry in column J where there is a 1 plotted in a column I choose. For example, say I want to look at the column J to K relationship. Then I would want to pull all data from J where columns J

问题 I had excel file , button (import) , openfiledialog and gridview at VB.Net 2013. My task is to make a button that will extract all data from excel file to datagridview openFileDialog1.InitialDirectory = "C:\\Users\\ProgrammerPC1\\Desktop\\DLAV FILES"; openFileDialog1.Title = "Import Master Data"; openFileDialog1.FileName = ""; openFileDialog1.Filter = "Excel Files|*.xls;*.xlsx;*.xlsm"; try { if (openFileDialog1.ShowDialog() == DialogResult.OK) { string name = "Sheet1"; string constr = @

问题 This is old question I posted: Reading one & Update some other Excel with c# As suggested I created schema.ini file. My excel files have so many columns (many of them are not fixed) with mixed data. Even a cell contains numbers along with text. I observed that NOT ALL values are shown when I read excel using OLEDB and populate into a DataTable. I can't assume ALL columns are put them into .ini file. Columns in my excel will go up to "DX". I observed that only 1st row which has number+text

问题 I'm trying to create an excel file and insert data into the excel file. The creation of the excel file doesnt fail, but when i try to insert data into a sheet in the excel file i get this error: The Microsoft Office Access database engine could not find the object 'Sheet1$'. Make sure the object exists and that you spell its name and the path name correctly. This is my code: private void exportToExcel_Click(object sender, EventArgs e) { string excelPath = Environment.GetFolderPath(Environment

问题 Hey guys i am working on a Search button that will search Users in database by their UserName or Their Cities Or anything else. I Tried to make a paramater of Username That inside i putted a Textbox and if he write something in the Textbox and click On the button it will show only the users with the UserName that he wrote inside the textbox... But its not working guys, Please help me to find out how to make it... Codes: 1 HTML(VeryShort): <asp:TextBox ID="txtUserNameFooter" runat="server" />

问题 I'm new to Database connection and when I am having a problem with the cmdInsert.ExecuteNonQuery() line it says there is a syntax error with the INSERT INTO statement and I can't figure out what the problem is: Imports System.Data Imports System.Data.OleDb Public Class txtNotes Dim cnnOLEDB As New OleDbConnection Dim cmdInsert As New OleDbCommand Dim strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & System.Environment.CurrentDirectory & "\CourseworkDB" 'the name of the

问题 I'm currently rebuilding tables from SQL Server to Access via C#. For that I'm getting the data types used in SQL Server and mapping them to OleDbType objects. Unfortunately, every time I'm trying to execute my statement for Access an exception will be thrown that there is a syntax error in my "Create Table" - statement. I'm guessing this is because I just add the mapped data types as text and not as OleDbParameters. Is there a way to create OleDbParameter - objects containing the column name

问题 In my application i have to read data from a CSV file. I want to use Microsoft Text Driver or Microsoft.Jet.OLEDB.4.0. I am confused between the two. Which one should i opt for? 回答1: These are more or less the same thing in that they both use Jet However, one is for OLE DB and one for ODBC, you might like to read OLE DB for the ODBC Programmer 来源： https://stackoverflow.com/questions/4569833/microsoft-text-driver-or-microsoft-jet-oledb-4-0