oledb

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 Unhandled Exception: System.Data.OleDb.OleDbException: SQL: Column 'Q578P5' is not found... I've written an app in VS2010 C#.net that reads data from an SQL table into datatable and then writes that into foxpro tables. On the Inventory table if fails as above at record 578. On the Customer table it fails at record 'Q617P78' I have tested for data issues by removing some records from the SQL table but the error still occurs at the same record number in spite of that record number not being the

问题 I have to import some Excel data on a regular basis. Checking the DB2 documentation one can directly access OLE DB datasources via an external function. However I'm unable to set it up properly. I got the Microsoft Access Database Enginge 2010 plus the fix pack and installed it on the database server. I placed the excel file in a local directory from the database server. ( C:\Temp\test.xls ) The excel has a workbook called TEST1 and two rows ABC and DEF following some numeric data: ABC | DEF

问题 I have a DataTable with a lot of rows (Over a hundred million) and am writing an application that needs to insert into that table. I will be using OleDbDataAdapter for the job and I am puzzled whats the best way to do this. I only need to insert into this enormous table, however I don't want to hard code the insert statement into application. I figured I could use OleDbDataAdapter adapter = new OleDbDataAdapter(); adapter.SelectCommand = new OleDbCommand("select * from table_name");

问题 I have two SQL queries: A. SELECT (upper(rtrim(ltrim(lastname))) + upper(rtrim(ltrim(firstname))) + upper(rtrim(ltrim(middlename))) + rtrim(ltrim(v)) ) AS userCompareStr FROM atable ; and B. SELECT (upper(rtrim(ltrim(lastname))) + upper(rtrim(ltrim(firstname))) + upper(rtrim(ltrim(middlename))) + rtrim(ltrim(v)) ) AS userCompareStr FROM atable WHERE userCompareStr='GAPYLE1111' ; I have the following code: Dim sql As String Dim conn As OleDbConnection Dim cmd As OleDbDataAdapter Dim ds As

问题 I have a C# program to write to Excel which is to support files without headers and files with. If I write where I want headers, this is fine, but in the case of reading a file without headers, I then want to write a table without headers. If I use the same headings to create a table, I still get F1, F2, F3 etc in the content. My connection string for writing is:- Provider=Microsoft.Jet.OLEDB.4.0; Data Source= filename ;Extended Properties="Excel 8.0;HDR=No;IMEX=0;" Any ideas on how to lose

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'm facing a problem with my console application. I want to read info from Microsoft Access database and display it on console. Here's the code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Data.OleDb; using System.Data.Sql; namespace _1_uzd { class Program { static void Main(string[] args) { string ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;DataSource=\"studentu-db.accdb\""; OleDbConnection con =

问题 how can I select the last 700 entry in my access databse? I'm using this private string strsqlcommandBeta = "select top 700 * from objectaer " + " order by objectdate desc" + " "; but I'm getting this error The SELECT statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect. 回答1: The SELECT statement includes a reserved word or an argument name that is misspelled or missing, or the punctuation is incorrect. Typically this is a

问题 While trying to create CDX file on existing DBF file using below code, I'm getting an exception saying " No table is open in the current work area" . Language - C# Exception Details - Message - No table is open in the current work area. Source - Microsoft OLE DB Provider for Visual FoxPro Below is code snippet: public void CreateIndex() { var cdxExpressions = new List<CDXExpression> { new CDXExpression { expression = "ENTRY_DATE", name = "cdx_p1"}, new CDXExpression { expression = "ENTRY_CODE