I am developing an application to recover data from a DBF file.
I did research on the Internet that sent me to this link : enter link description here
I applied this code but nothing helps it doesn't work :/
string constr = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\Test\users.dbf;Extended Properties=dBASE IV;User ID=;Password=MyPassword;";
using (OleDbConnection con = new OleDbConnection(constr))
{
var sql = "select * from users.dbf";
OleDbCommand cmd = new OleDbCommand(sql, con);
con.Open();
DataSet ds = new DataSet(); ;
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
da.Fill(ds);
}
I pass this code in a Try and Catch and it returns me this error: Unable to start your application. The workgroup information file is missing or opened exclusively by another user.
the error is caused when trying to open the connection. However the file is neither opened nor used by anyone else.
thank you in advance ;)
Try to remove the file name in the connection string. According to the documentation, The "Data Source" property should only contain the path.
string constr = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\Test;Extended Properties=dBASE IV;User ID=;Password=MyPassword;";
Related
Maybe someone can help me with the following problem:
I want to import a excel file and read the columns in to the database. I used OleDB provider so far:
string constr = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=Excel 8.0", path);
using (OleDbConnection conn = new OleDbConnection(constr))
{
conn.Open();
OleDbCommand command = new OleDbCommand("Select * from [Sheet1$]", conn);
OleDbDataReader reader = command.ExecuteReader();
is there an alternate for doing this without OleDB? im getting the following errormessage:The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine. and i dont have the option to install ole DB on the environment where the application is running.
thanks
Have no idea what I'm doing wrong here but I keep getting the following exception on the connection.Open(); line:
IErrorInfo.GetDescription failed with E_FAIL(0x80004005)
Problem is I have almost the exact same code in another batch job and it works fine. We even pull a spreadsheet from the same location. Does anyone see anything wrong with my connection or query string?
static void Main(string[] args)
{
string connString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source= \\prdhilfs03\l&i-sales&mkt\WORKAREA\Agencyservices\Shared\AIC\Analysts_and_Reporting\Realignments\2014\MassUpdateTesting\ZipCodeTest.xslx;Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
string queryString = "SELECT * FROM [Query1$]";
try
{
OleDbDataReader reader;
using (OleDbConnection connection = new OleDbConnection(connString))
{
//Set connection objects to pull from spreadsheet
OleDbCommand command = new OleDbCommand(queryString, connection);
connection.Open();
For good measure here's a screen shot of the workbook I'm trying to connect to
Did you try to check if you can access the file?
string xlFile = #"\\prdhilfs03\l&i-sales&mkt\......\ZipCodeTest.xlsx";
Console.WriteLine(File.Exists(xlFile) ? "Excel File exists." : "Excel File does not exist.");
I am trying to load data using following code.
string path = System.IO.Path.GetFullPath(uploadExcelFile.PostedFile.FileName);
string connString = "provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Rizwan shahid\\Desktop\\DataUpload\\Req.xls;Extended Properties=Excel 12.0;";
OleDbConnection oledbConn = new OleDbConnection(connString);
try
{
oledbConn.Open();
OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Sheet1$]", oledbConn);
OleDbDataAdapter oleda = new OleDbDataAdapter();
oleda.SelectCommand = cmd;
DataSet ds = new DataSet();
oleda.Fill(ds, "Table");
return ds.Tables[0];
}
catch
{
return null;
}
finally
{
oledbConn.Close();
}
It was working on 32Bit operating system but when run this code on 64Bit OS it gives the following error
The Microsoft Access database engine could not find the object 'Sheet1$'. Make sure the object exists and that you spell its name and the path name correctly. If 'Sheet1$' is not a local object, check your network connection or contact the server administrator.
I am running VS in Administrator mode and found many solution like replace Sheet1 with file name or place file in C drive but still getting the same error.
you can download latest version here of Jet
http://www.microsoft.com/en-us/download/search.aspx?q=jet
This works (I start out with a 'dummy' path and then apply the real runtime path):
OleStringBuilder =
new OleDbConnectionStringBuilder(#"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;Extended Properties='Excel 8.0;HDR=Yes;IMEX=1';");
OleStringBuilder.DataSource = MapPath(#"~\App_Data\MyExcelWorksheet.xls");
I'm having a problem opening a DBF file - I need to open it, read everything and process it. I tried several solutions (ODBC/OLEDB), several connection string, but nothing worked so far.
The problem is, when I execute the SQL command to get everything from the file, nothing gets returned - no rows. What's even more odd, the content of the DBF file being opened get deleted.
See the code I have:
public override bool OpenFile(string fileName, string subFileName = "")
{
OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Path.GetDirectoryName(fileName) + ";Extended Properties=dBASE IV;User ID=;Password=;");
try
{
if (con.State == ConnectionState.Closed) { con.Open(); }
OleDbDataAdapter da = new OleDbDataAdapter("select * from " + Path.GetFileName(fileName), con);
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
int i = ds.Tables[0].Rows.Count;
return true;
}
catch
{
return false;
}
}
I debugged the code and watched the file being opend in Windows Explorer. When it reached this line:
da.Fill(ds);
the size of the file dropped to only a few Bytes (from hundreds of kB).
My next thought was to make the DBF file read only. That however cause an "unexpected exception from an external driver".
So my question is - what the heck? I'm sure the file is not corrupt, it is a direct export from some DB. (No, I do not have access to that DB). I can also open that file in MS Office no problem.
I cannot share the DBF file - it contains confidential data.
Two things... just because its a .DBF file extension might night mean its a Dbase IV file. It might actually be that of Visual Foxpro. That said, I would look into downloading and installing the Visual Foxpro OleDB driver from Microsoft download. Next, the OleDbConnection is pointing to the path that has the actual tables (you already have that).
The query itself, shouldn't care about the extension, so I would change your call to get just then name via "Path.GetFileNameWithoutExtension"
It might be a combination of the two.
Connection string for VFP provider
"Provider=VFPOLEDB.1;Data Source=" + FullPathToDatabase
This is not the exact answer but it will help you to find the issue.
Try to give an inline connection string and select query to make sure problem is not with building those. Catch the exception and check the details of it.
OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\folder;Extended Properties=dBASE IV;User ID=;Password=;"); // give your path directly
try
{
con.Open();
OleDbDataAdapter da = new OleDbDataAdapter("select * from tblCustomers.DBF", con); // update this query with your table name
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
int i = ds.Tables[0].Rows.Count;
return true;
}
catch(Exception e)
{
var error = e.ToString();
// check error details
return false;
}
I added an external Data Source to my C# app (I've placed it on the root directory in a folder named 'data') but when I run the program I get an error at con.Open():
An attempt to attach an auto-named database for file C:\Users\alex\documents\visual studio 2010\Projects\Network_Remote_Monitoring\Network_Remote_Monitoring\bin\Debug\data\bd.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
Here is my source code :
con = new System.Data.SqlClient.SqlConnection();
con.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\data\\bd.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
ds1 = new DataSet();
ds2 = new DataSet();
con.Open();
string sql = "SELECT * From localitati";
da = new System.Data.SqlClient.SqlDataAdapter(sql, con);
da.Fill(ds1, "localitati");
sql = "SELECT * From sucursale";
da = new System.Data.SqlClient.SqlDataAdapter(sql, con);
da.Fill(ds1, "sucursale");
con.Close();
I think you have a same problem as this question: connect to .mdf file in vs2010 , wpf application
I answer it there, but it's just my guess. because it is usual problem.
Does the account that is running your application have access to the data folder?