oledbconnection

问题 Hello I'm having problem with updating datatypes I insert the date in the C# part like this string strSQL = "INSERT into Frettir (CreatedBy,CreatedOn,Title,Description,Starts,Ends,CatId,SectionId,ArticleExt,Myndatexti,MyndUrAlbumi,NrMyndar) values(?,?,?,?,?,?,?,?,?,?,?,?)"; cmd.Parameters.Add("@Starts",OleDbType.Date).Value = dstartdate; but I update in the aspx part like this UpdateCommand="UPDATE [Frettir] SET [Title]=@Title,[Description]=@Description,[CreatedBy]=@notandaID,[ArticleExt]=

问题 When I use this code it returns every row in the table and i have no idea why. string SelectOleDb = "SELECT Top 1 * From `Employee Info` Where [Employee Name]=@EmployeeName" Order By ID DESC"; OleDbConnection OleDbCon = new OleDbConnection(EmployeeInfo.Properties.Settings.Default.cstrEmployeeInfoDatabase); OleDbDataAdapter OleDbAdpt = new OleDbDataAdapter(); OleDbCommand OleDbCom = new OleDbCommand(SelectOleDb, OleDbCon); OleDbCom.Parameters.AddWithValue("@EmployeeName", employee_NameComboBox

问题 I want to write certain data to my excel file and for that purpose i am using OLEDB. I have a huge chunk of data which can count to maybe 50000 to 60000 records. Currently my code is as shown below: string connectionString = String.Format("Provider=Microsoft.ACE.OLEDB.12.0; Data Source ={0};Extended Properties ='Excel 12.0 Xml;HDR=YES;Mode=ReadWrite';", filePath); using (OleDbConnection cn = new OleDbConnection(connectionString)) { String statement = "UPDATE [Sheet1$] SET [Status] = @Status,

问题 I am copying an Excel sheet into a Datatable as such: OleDbCommand command = new OleDbCommand(); command = new OleDbCommand("Select * from [working sheet$]", oleDBConnection); OleDbDataAdapter dataAdapter = new OleDbDataAdapter(); dataAdapter.SelectCommand = command; dataAdapter.Fill(dt); Is there a similar method where I can just simply copy the datatable back to an Excel sheet? The examples I keep finding are copying cell by cell, but this can be noticably slow with large data sets. Thanks

问题 I am new to C# and trying to write values to an excel file using OLEDB. The problem here is the first time if there is no excel file present in that location it works fine and prints the value to excel, but the second time if the excel is present it does not overwrite or write a new value to the excel. I also need to run this in a loop as I have four rows to print and not one. Need help with this. This is my code snippet and I know I it has code for only one row to print but I don't know the

问题 hello i have create a table buy_unit in oracle database CREATE TABLE buy_unit( unit_id NUMBER(10) not null PRIMARY KEY, unit_name VARCHAR2(10) not null ); and insert Values INSERT INTO BUY_UNIT values(001,'Liter'); desc SELL_BUY_UNIT; then create a combo box combobox1 in C# now can load buy_unit table data in combobox ? i have use the connection: OleDbConnection con = new OleDbConnection("Provider=MSDAORA;Data Source=XE;User ID=user1;password=pssword"); 回答1: Well, you can see below code which

问题 I had started on an application on gathering data from meteorological stations for some time now and to make it cross platform I used .net core 2.2 mvc along with some libraries. Even though the data is saved in a mysql db, the client recently requested that selected meteo records from a list, to be saved in a local access db. To achieve that I had to use the legit database provider from microsoft which in this case is EntityFrameworkCore.Jet . I didn't know that there was a compatibility

问题 I am interested how can I find the connection string in order to be able to connect to MySQL Server 5.1.50 using OleDbConnection(C#). I used this auto generated string (after adding new data source in Visual Studio): server=localhost;User Id=MyID;password=MyPassword;database=MyDatabase but I always get the same error message: An OLE DB Provider was not specified in the ConnectionString. An example would be, 'Provider=SQLOLEDB;'. I have tried different providers but neither of them seems to

问题 I am designing a SSIS package which imports data from one data base to other database. In reality I need to import data from multiple data source to one destination database . One way to do, that I know is to use package configuration for all data sources (connection strings) and run multiple instances of the same package. But I want something like, I should provide as many connection strings as I need at a point of time in my config file and my package should connect to each database reading

问题 Data needs to be read into .net gridview from excel worksheet. Here are the aspx and aspx.cs codes. ASPX: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Read and Display Data From an Excel File (.xsl or .xlsx) in ASP.NET</title> </head> <body> <form id="form1" runat="server"> <div> <b>Please Select Excel File: </b> <asp:FileUpload ID="fileuploadExcel" runat="server" />