oledb

问题 I'm trying my best to insert a new data row in excel file. please have a look. i'm facing this problem using C#.net framework (3.5) code: try{ string ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\\rising rent\\csharp-Excel.xls;Extended Properties='Excel 12.0;HDR=Yes;IMEX=1;MAXSCANROWS=15;READONLY=FALSE;ImportMixedTypes=Text'"; OleDbConnection conn = new OleDbConnection(ConnectionString); conn.Open(); OleDbCommand cmd = new OleDbCommand("INSERT INTO [Inventory$] (C_DATE)

问题 Does anybody have an example of working with database using Visual C++ and OLEDB? What should I include on top of my code? I have searched the internet and most examples are using C# or VB. Examples written by C++ are usually not complete. I really appreciate your help. Best, Shadi. 回答1: You probably want to use ADO to do this. Writing code directly to OLE DB from C/C++ is a fair bit of work (understatement). If you google for c++ ado , there are a number of hits. The top two are this one on

问题 I am looking to get all the tables given a msAccess file. The following is what I do: public override List<string> GetTables() { using (OleDbConnection con = new OleDbConnection(Path)) { con.Open(); DataTable schema = con.GetSchema("Columns"); List<string> tables= new List<string>(); foreach (DataRow row in schema.Rows) { tables.Add(row.Field<string>("TABLE_NAME")); } return tables; } } However, although all the table names are returned, it seems each one is returned 10 times. Why is it doing

问题 Aim to achieve : Want to dump a fetched table to a excel sheet. My implementation : Imports System.Data.OleDb Private Sub getRawDataNextMonth() Dim sheetName As String = "RawData" Dim con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\rawData.xlsx;Extended Properties=""Excel 12.0 XML;""") Dim adapter As New Data.OleDb.OleDbDataAdapter("SELECT * FROM [Sheet1$]", con) Dim dataSet As New Data.DataSet adapter.Fill(dataSet) Dim dataTable As Data.DataTable = dataSet.Tables

问题 I'm having some trouble getting my DataSet to work. I have a MDB-Database in the background and created a DataSet out of it. Now I created a new method that lets me create a new user in the table. But when I call it, nothing happens. No exceptions, no errors and I even get "1" returned as number of affected rows. But when I look in the database, no user was added. I have the feeling that I miss to somehow tell the DataSet that I want to operate the Database itself rather than just the

问题 I have the following code for using an access database OleDbConnection con = new OleDbConnection(myproject.Properties.Settings.Default.myDBConnectionString); con.Open(); OleDbCommand command = new OleDbCommand("INSERT INTO components (name) VALUES (@p_col1)", con); command.Parameters.Add("@p_col1", OleDbType.VarChar).Value = "test row"; int rows = command.ExecuteNonQuery(); At this point rows value is 1 and when I make select queries after that the row inserted is available. The problem comes

问题 I'm reading in an excel file with the following code: Function Read_Excel(ByVal sFile As String) As ADODB.Recordset On Error GoTo fix_err Dim rs As ADODB.Recordset rs = New ADODB.Recordset Dim sconn As String rs.CursorLocation = ADODB.CursorLocationEnum.adUseServer rs.CursorType = ADODB.CursorTypeEnum.adOpenStatic rs.LockType = ADODB.LockTypeEnum.adLockReadOnly sconn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & sFile & ";Extended Properties=""Excel 12.0;HDR=YES;IMEX=1"";" rs.Open(

问题 I'm working on a VB2008 project that references two Access databases using Provider=Microsoft.Jet.OLEDB.4.0; It would seem if the user does not have MSOffice on their machine, the program crashes with a "XXX stopped working" on startup on Vista and Win7. I thought that Windows had XP and above had Jet functionality built in? Does anyone know why this is happening? What are the correct project/publish/prerequisites required please? TIA 回答1: There is absolutely NO Jet support for x64

问题 I am using an OLEDB connection (Microsoft.ACE.OLEDB.12) to read records from a C# data table and put the records into an excel spreadsheet. I am looping round each record in my data table and building up OLEDBCommand.CommandText using an "Insert into table name values (" etc. I am having to format the values appropriately so that string/char/integer/decimal are inserted correctly. This all works fine and my spreadsheet is created, however when there are loads of records to insert (e.g. 500

问题 I have an OLEDB data connection and I am only wanting to import columns A:O into a table. I can import all the data...successfully, but not limit it to just those columns (A:O) I am populating the Connection Properties screen.. Thanks in advance... Provider=Microsoft.ACE.OLEDB.12.0;User ID=Admin;Data Source=FILEPATH;Mode=ReadWrite;Extended Properties="IMEX=1;HDR=NO;string sql=""select * from ['SHEETNAME'$A:$O]""";Jet OLEDB:System database="";Jet OLEDB:Registry Path="";Jet OLEDB:Engine Type=35