I am working on reading in excel files (both .xls and .xlsx) into my program which is being written into a data table. When running the code on one computer it works perfectly fine, when I attempt to run it on another computer I get the following exception:
System.Data.OleDb.OleDbException (0x80004005): Unspecified error at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)
This exception is thrown when the program attempts to open the connection to the excel file to read the data in. I have installed 2010 Access Database Engine on the other computer but I still receive the same error when running the code. I was trying to get around the use of the Excel Interop services as it took too long to read in some of the file I am working with. I have done some searching around and have tried various different solutions such as different modifications to the connection string and changing with OLEDB driver I am using to open the connection to the file. This is the code I am using,
private static DataTable ReadExcelData(String path, String TableName)
{
string ConnectionString = $"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={path};Extended Properties='Excel 12.0;HDR=Yes;IMEX=1'";
DataTable dt = new DataTable(TableName);
using (OleDbConnection conn = new OleDbConnection(ConnectionString))
{
conn.Open();
DataTable table = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
String sheetName = table.Rows[0]["TABLE_NAME"].ToString();
using (OleDbCommand comm = new OleDbCommand("SELECT * FROM [" + sheetName + "$]", conn))
using (OleDbDataAdapter da = new OleDbDataAdapter(comm))
da.Fill(dt);
conn.Close();
}
return dt;
}
Figured out the issue, I had to installed the 2016 version of the driver and not the 2010 version which allowed it to work properly.
Related
An old C# program no longer works to read an MS-Access database through Jet.OLE.DB. Also a new compilation without any changes of the source code didn't help.
My laptop is running Windows 10 and the MS Office is LTSC Professional Plus 2021 32-bit.
I uninstalled Office LTSC 64-bit to install Office LTSC 32-bit and am trying to fix the problem installing the following recommended runtime packages:
AccessDatabaseEngine.exe
mdac28sdk.msi
AccessRuntime2007.exe
AccessRuntime_x86_en-us.exe
Our customer uses MS Access because he has linked thousands of macros in Excel with Access and switching to other databases is not possible.
It wasn't possible to use OLE in the current Windows 10 OS 64bit environment and that's why I switched to ODBC and it works.
I gave up using Visual Studio 2022 and switched to ACE for now because VS 2022 is really weird. I tried updating the current VS 2017 project but I couldn't select a NET Frame higher than 4.8. I created a new project and then I could select NET 6 or 7 if I would select "Windows Forms App" instead of "Windows Forms App (NET Framework)" but the toolbox is empty.
/*old code*/
string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Datenbank + ";";
OleDbConnection conn = new OleDbConnection(connStr);
String strCommand = "SELECT * FROM Tickets WHERE [Ticket_Nummer] = #Ticket_Nummer";
OleDbDataAdapter da = new OleDbDataAdapter(strCommand, conn);
da.SelectCommand.Parameters.Add("#Ticket_Nummer", OleDbType.Integer).Value = Ticket_Nummer;
/*new code*/
string connStr = "Driver={Microsoft Access Driver (*.mdb)};"
+ "Dbq="+ Datenbank+";Uid=Admin;Pwd=;";
OdbcConnection conn = new OdbcConnection(connStr);
String strCommand = "SELECT * FROM Tickets WHERE [Ticket_Nummer] = ?";
OdbcDataAdapter da = new OdbcDataAdapter(strCommand, conn);
da.SelectCommand.Parameters.Add("#Ticket_Nummer", OdbcType.Numeric).Value = Ticket_Nummer;
/*rest code*/
DataSet DataSet = new DataSet();
da.Fill(DataSet, "TICKET");
DataTable dataTable = DataSet.Tables[0];
DataTableReader dr = new DataTableReader(dataTable);
I have a legacy Visual FoxPro database from which I need to get the data from.
I have DBC, DCT, DCX & FPT files in the database folder.
I installed the Visual FoxPro provider & driver and wrote a short C# program to access the data.
I also made sure the program is running in 32bit mode, since I understood that the VFP driver is 32bit.
However I'm getting the following error:
Additional information: Connectivity error: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
I made sure that the driver name ("Microsoft Visual FoxPro Driver") as appears in the Windows ODBC 32bit administration tool is specified in the connection string, but it doesn't seem to help.
The code:
OleDbConnection yourConnectionHandler = new OleDbConnection(
#"Provider=VFPOLEDB.1;DRIVER=Microsoft Visual FoxPro Driver;Data Source=mydatabase.dbc;Mode=Read;Collating Sequence=machine");
// Open the connection, and if open successfully, you can try to query it
yourConnectionHandler.Open();
if (yourConnectionHandler.State == ConnectionState.Open)
{
string mySQL = "select * from tablename";
var command = yourConnectionHandler.CreateCommand();
command.CommandText = mySQL;
var res = command.ExecuteReader(); // throws the error
yourConnectionHandler.Close();
}
I've been stuck on this for a long time, and have tried everything I could find on the net.
Any idea?
You are saying provider and trying to use OleDbConnection (which is right) but defining an ODBC driver within the connection string. In other words, your connection string is wrong.
using (OleDbConnection cn = new OleDbConnection(
#"Provider=VFPOLEDB;Data Source=c:\MyPath\mydatabase.dbc;Mode=Read;Collating Sequence=machine"))
using (OleDbCommand cmd = new OleDbCommand("select * from tablename", cn))
{
cn.Open();
var reader = cmd.ExecuteReader();
// do something with the reader. ie:
// someDataTable.Load(reader);
cn.Close();
}
It works wonderfully well. In connectionstring you don't need to use the database name, you can just use the tables' path as the data source.
I am developing a WPF application.
I created a local SQLite database (using System.Data.SQLite):
SQLiteConnection conn = new SQLiteConnection("Data Source=test.db");
And need to fill it with a MySQL database located in a server. I already got to download the .sql dump file from the server, the problem is that how can i import this file to my local database?
I already searched on the web and found this question the problem is that this mention android...
Any information is welcome.
UPDATE 1:
Opening the .sql file and executing a SQLite command does not import the .sql, here is my code:
string lines = "";
try
{
using (StreamReader sr = new StreamReader(databaseFile))
{
lines += sr.ReadToEnd();
}
} catch (Exception)
{
}
SQLiteConnection conn = new SQLiteConnection("Data Source=test.db");
conn.Open();
var command = conn.CreateCommand();
command.CommandText = lines;
command.ExecuteNonQuery();
conn.Close();
The application crashes with the next error:
Additional information: SQL logic error or missing database
near "AUTO_INCREMENT": syntax error
They are different SQL dialects so that solution is going to give you quite a bit of a headache.
If this is a one time activity I would use a (free) tool like:
http://www.sql-workbench.net/
that has a Data Pump tool that allows you to move data across different databases.
I'm an newbie who is trying to get learn some web programming. I'm making my site in VS 2012 using C#. I've got a database connected in the App_Data folder, using SQL Server CE 4.0. I'm attempting to connect to it as follows:
SqlCeCommand cmd1 = new SqlCeCommand("SELECT Admin FROM SystemUsers WHERE Email=" + user.Email);
SqlCeDataReader admin = null;
SqlCeConnection conn = new SqlCeConnection();
conn.ConnectionString = "Data Source=MyData.sdf;Persist Security Info=False;";
conn.Open();
admin = cmd1.ExecuteReader();
When I execute this, I get the following error:
An exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.SqlServerCe.dll but was not handled in user code
Any thoughts as to what I'm doing wrong? I've been trying to figure this out for hours.
You said that your database is in the APP_Data directory, but your connection string assumes that is in the root directory of your site.
Try with
conn.ConnectionString = #"Data Source|DataDirectory|\MyData.sdf;Persist Security Info=False;";
The |DataDirectory| is a placeholder string that the NET Framework changes to a predefined location where you data files are supposed to stay
And this is how I would change your code
using(SqlCeConnection conn = new SqlCeConnection(#"Data Source|DataDirectory|\MyData.sdf;Persist Security Info=False;"))
using(SqlCeCommand cmd1 = new SqlCeCommand("SELECT Admin FROM SystemUsers WHERE Email=#mail", conn))
{
conn.Open();
cmd1.Parameters.AddWithValue("#mail", user.Email);
SqlCeDataReader admin = cmd1.ExecuteReader();
while(admin.Read())
{
.....
}
}
As you can see, I have made this changes:
Added a using statement around the creation of the connection and of
the command. This will ensure proper closing and disposing of the two
objects.
Added a parameterized query to avoid problems in parsing text strings
and Sql Injections
I'm trying to import some data from excel into a database . i got the following code from http://www.davidhayden.com/blog/dave/archive/2006/05/31/2976.aspx . I have a x86 arhitecture so that's not the problem . when i run the code the program says at connection.Open(); that The 'Microsoft .Jet.OLEDB.4.0' provider is not registered on the local machine. Any ideas ?
string excelConnectionString = #"Provider=Microsoft
.Jet.OLEDB.4.0;Data Source=C://suc.xls;Extended
Properties=""Excel 8.0;HDR=YES;""";
// Create Connection to Excel Workbook
using (OleDbConnection connection =
new OleDbConnection(excelConnectionString))
{
OleDbCommand command = new OleDbCommand
("Select ID,Data FROM [Data$]", connection);
connection.Open();
// Create DbDataReader to Data Worksheet
using (DbDataReader dr = command.ExecuteReader())
{
// SQL Server Connection String
string sqlConnectionString = "Data Source=.;Initial Catalog=Test;Integrated Security=True";
// Bulk Copy to SQL Server
using (SqlBulkCopy bulkCopy =
new SqlBulkCopy(sqlConnectionString))
{
bulkCopy.DestinationTableName = "ExcelData";
bulkCopy.WriteToServer(dr);
}
}
}
If you are running the code on a 64 bit machine, and its a web project, then open IIS, right click on the Application pool and click on Advanced settings. Set the second property from the top: Enable 32 bit application to True, that should fix the problem.
I assume that both that the correct version of Excel and the Interop.Excel.dll file is present on the machine generating this error? Since the Jet provider is found in the interop DLL I think that is the most likely explanation.