Develop Reference

C# ace oledb 12 read-only file

I have a SSIS package with script task. c# script use ACE Oledb 12.0 provider to connect to excel file. The question is, how to connect to excel file in read-only mode (if someone open the file, my script should not have an error - it should work). The code, I tried here:
string fileToTest = Dts.Variables["User::FileName"].Value.ToString();
string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source=" + fileToTest + #";Extended Properties=""Excel 8.0;READONLY=1""";
OleDbConnection excelConnection = new OleDbConnection(connectionString);
excelConnection.Open();
string sqlQuery = "SELECT * FROM [SheetName$A1:FZ1000]";
OleDbDataAdapter dataAdt = new OleDbDataAdapter(sqlQuery, excelConnection);
DataSet dataSt = new DataSet();
dataAdt.Fill(dataSt, "TblName1");
DataTable dataTbl = dataSt.Tables["TblName1"];
I receive oledbexception, if someone open the file.

Use google to search for that.
I searched for: "microsoft.ace.oledb.12.0 read only"
https://social.msdn.microsoft.com/Forums/office/en-US/498cd52a-b0ee-4c8d-8943-2b76055b4130/oledbconnection-read-only-mode?forum=accessdev
It looks like you can add to the connection string.
From that page:
Actually, with an OleDbConnection (assuming .net here). You can specify a read only mode in your connection string of the OleDbConnection. The following connection string will prevent you from changing data in your datasource:
const string cnnString = "Provider=Microsoft.ACE.OLEDB.12.0"
+ ";Mode=Read"
+ #";Data Source=|DataDirectory|\Northwind 2010.accdb";
It looks like adding ;Mode=Read to the connection string should do the trick.

Error connecting to Excel spreadsheet

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.");

C# Open DBF file

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;
}

How can I connect to a SDF database? No connection string I try seems to work

I've tried literally 50+ different attempts at my connection string for my local database and nothing seems to work. I'm essentially just trying to open a connection the database file so I can dump in the data I've pulled out of my excel spreadsheet. I'm using Visual C# making an offline winform application.
No matter what connection string I try in my app.config, it always fails when it tries to write "dReader" to the database.
The error is usually this depending on what string I try:
"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"
I've gone through many online examples and resources and none seem to work. I'm hoping someone here can point out why it's failing.
Here is my app.config in its latest form:
<connectionStrings>
<add name="DDP_Project.Properties.Settings.DDP_DatabaseConnectionString"
connectionString="Data Source=E:\Other DDP Projects\DDP_Project_SDF\DDP_Project\DDP_Database.sdf;"
providerName="Microsoft.SqlServerCe.Client.3.5" />
</connectionStrings>
Here is my form code:
private void Profiles_Click(object sender, EventArgs e)
{
profilesDialog.FileName = "[YOUR_UPLOAD_FILE_HERE]";
var result = profilesDialog.ShowDialog();
if (result == DialogResult.OK)
{
HandleFileSelection();
}
}
private void HandleFileSelection()
{
var file = profilesDialog.FileName;
// Create a connection to the file datafile.sdf in the program folder
string dbfile = new System.IO.FileInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).DirectoryName + "\\DDP_Database.sdf";
SqlCeConnection connection = new SqlCeConnection("datasource=" + dbfile);
string strConnection = ConfigurationManager.ConnectionStrings["DDP_Project.Properties.Settings.DDP_DatabaseConnectionString"].ConnectionString;
//Create connection string to Excel work book
string excelConnectionString = string.Format(
#"Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=""{0}"";
Extended Properties=""Excel 8.0;HDR=YES;""", file
);
//Create Connection to Excel work book
OleDbConnection excelConnection = new OleDbConnection(excelConnectionString);
OleDbCommand cmd = new OleDbCommand("SELECT [ID],[STATUS],[FAN_NUM],[PROFILE_NAME],[DESTINATION_HOST],[USER_ID],[USER_PASSWORD],[PROTOCOL],[PORT],[PATH],[CONTACT_NAME],[CONTACT_EMAIL],[CONTACT_PHONE],[CONTACT_ALT_PHONE],[CONTACT_CITY],[CONTACT_STATE],[CONTACT_CONTACT_TIME] FROM [Sheet1$]", excelConnection);
excelConnection.Open();
OleDbDataReader dReader;
dReader = cmd.ExecuteReader();
SqlBulkCopy sqlBulk = new SqlBulkCopy(strConnection);
sqlBulk.DestinationTableName = "Profiles";
sqlBulk.ColumnMappings.Add("ID", "ID");
sqlBulk.ColumnMappings.Add("STATUS", "STATUS");
sqlBulk.ColumnMappings.Add("FAN_NUM", "FAN_NUM");
sqlBulk.ColumnMappings.Add("PROFILE_NAME", "PROFILE_NAME");
sqlBulk.ColumnMappings.Add("DESTINATION_HOST", "DESTINATION_HOST");
sqlBulk.ColumnMappings.Add("USER_ID", "USER_ID");
sqlBulk.ColumnMappings.Add("USER_PASSWORD", "USER_PASSWORD");
sqlBulk.ColumnMappings.Add("PROTOCOL", "PROTOCOL");
sqlBulk.ColumnMappings.Add("PORT", "PORT");
sqlBulk.ColumnMappings.Add("PATH", "PATH");
sqlBulk.ColumnMappings.Add("CONTACT_NAME", "CONTACT_NAME");
sqlBulk.ColumnMappings.Add("CONTACT_EMAIL", "CONTACT_EMAIL");
sqlBulk.ColumnMappings.Add("CONTACT_PHONE", "CONTACT_PHONE");
sqlBulk.ColumnMappings.Add("CONTACT_ALT_PHONE", "CONTACT_ALT_PHONE");
sqlBulk.ColumnMappings.Add("CONTACT_CITY", "CONTACT_CITY");
sqlBulk.ColumnMappings.Add("CONTACT_STATE", "CONTACT_STATE");
sqlBulk.ColumnMappings.Add("CONTACT_CONTACT_TIME", "CONTACT_CONTACT_TIME");
sqlBulk.WriteToServer(dReader);
sqlBulk.Close();
excelConnection.Close();
}
private void profilesDialog_FileOk(object sender, EventArgs e)
{
}
}
}

Try this...
First:
Create first a test method which you may check if you can connect to sqlcedatabase.
private void testconnection()
{
string strConnection = ConfigurationManager.ConnectionStrings["DDP_Project.Properties.Settings.DDP_DatabaseConnectionString"].ConnectionString;
using (var conn = new SqlCeConnection(string.Format("Data Source={0};Max Database Size=4091;Max Buffer Size = 1024;Default Lock Escalation =100;", strConnection)))
{
conn.Open();
try
{
//your Stuff
}
catch (SqlCeException)
{
throw;
}
finally
{
if (conn.State == ConnectionState.Open) conn.Close();
}
}
}
Second:
Just Load your excel file Data into a Datatable and use foreach then save it on your sql ce database file..
//Something like
//oledbcon
//oledb dataadapter
//datatable
// dapt.Fill(dt);
foreach(DataRow excel in dt.Rows)
{
ceCmd.Parameters.AddWithValue("ID",excel["ID"]);
ceCmd.ExecuteNonQuery();
}
Regards

I think the problem you are seeing is that you are trying to use a SqlConnection to connect to a SQL Compact database. The .sdf is a compact database and you have to use the SqlCeConnection to connect to it. You create the connection using this but then you don't use it. Instead you pass in the connection string to the SqlBulkCopy object which implicitly creates a SqlConnection from that string. I'm assuming it is on that line where you are getting the error. If you notice the namespace of the SqlBulkCopy is System.Data.SqlClient. The reason you are seeing the error is that its trying to go through SQL Server to make the connection and cannot resolve your connection string to a SQL Server database. Unfortunately, I don't think the System.Data.SqlServerCe has the equivalent to the SqlBulkCopy. Stick to using classes in System.Data.SqlServerCe and things should work as expected. You just will have to do the processing in a more manual fashion.

According to this post, SqlBulkCopy isn't supported with SqlCe.

How to read Excel file in c# by connection string?

How to read the excel file and show its data in grid view ? I tried the ODBC provider its working but, it is happening win "Dns=EXCELF", how it will possible with connection sring ? I generate my Excel sheet connection string as :
Provider=MSDASQL.1;Persist Security Info=False;User ID=admin;Data Source=Excel Files;Initial Catalog=D:\Parallelminds\Tryouts\sample.xlsx
Is that wrong ? please guide me. which connection string i have to give there...?

It varies somewhat by version of Excel, but if this is pre-2007, you can find what you need here: http://connectionstrings.com/excel
Otherwise, browse http://connectionstrings.com/. It's there somewhere, I promise :).

public string BuildExcelConnectionString(string Filename, bool FirstRowContainsHeaders){
return string.Format("Provider=Microsoft.Jet.OLEDB.4.0;
Data Source='{0}';Extended Properties=\"Excel 8.0;HDR={1};\"",
Filename.Replace("'", "''"),FirstRowContainsHeaders ? "Yes" : "No");
}
public string BuildExcel2007ConnectionString(string Filename, bool FirstRowContainsHeaders){
return string.Format("Provider=Microsoft.ACE.OLEDB.12.0;
Data Source={0};Extended Properties=\"Excel 12.0;HDR={1}\";",
Filename.Replace("'", "''"),FirstRowContainsHeaders ? "Yes" : "No");
}
private void ReadExcelFile(){
string connStr = BuildExcel2007ConnectionString(#"C:\Data\Spreadsheet.xlsx", true);
string query = #"Select * From [Sheet1$] Where Row = 2";
System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(connStr);
conn.Open();
System.Data.OleDb.OleDbCommand cmd = new System.Data.OleDb.OleDbCommand(query, conn);
System.Data.OleDb.OleDbDataReader dr = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(dr);
dr.Close();
conn.Close();
}

This Excel Data Provider is very handy. I recently used it on one of my client's websites with a few minor customizations. If you look through the code you should be able to get a solid idea of how to query Excel from C#.
Just a warning: if Excel is not installed on the deployment machine then you will be restricted to parsing standard XLS files (Office thru 2003), and will not be able to read XLSX (Office 2007).