Script task failed to generate dynamic Excel workbook - sql-server

Question

I want to load sql query(Number of column change every time)data in Excel workbook that create column header dynamically.
First i have create four variable
Table Customer_NA have some entries
And create Ado.net connection and configure server-name and database name
Drag Script task and and assign all 4 variable in ReadOnlyVariable.
Edit Script task and write code to generate excel sheet column dynamically
public void Main()
{
// TODO: Add your code here
string datetime = DateTime.Now.ToString("yyyyMMddHHmmss");
try
{
//Declare Variables
string ExcelFileName = Dts.Variables["User::ExcelFileName"].Value.ToString();
string FolderPath = Dts.Variables["User::FolderPath"].Value.ToString();
string TableName = Dts.Variables["User::TableName"].Value.ToString();
string SheetName = Dts.Variables["User::SheetName"].Value.ToString();
ExcelFileName = ExcelFileName + "_" + datetime;
OleDbConnection Excel_OLE_Con = new OleDbConnection();
OleDbCommand Excel_OLE_Cmd = new OleDbCommand();
//Construct ConnectionString for Excel
string connstring = "Provider=Microsoft.ACE.OLEDB.16.0;" + "Data Source=" + FolderPath + ExcelFileName
+ ";" + "Extended Properties=\"Excel 12.0 Xml;HDR=YES;\"";
//drop Excel file if exists
File.Delete(FolderPath + "\\" + ExcelFileName + ".xlsx");
//USE ADO.NET Connection from SSIS Package to get data from table
SqlConnection myADONETConnection = new SqlConnection();
myADONETConnection = (SqlConnection)(Dts.Connections["Ado_Conn"].AcquireConnection(Dts.Transaction) as SqlConnection);
//Load Data into DataTable from SQL ServerTable
// Assumes that connection is a valid SqlConnection object.
string queryString =
"SELECT * from " + TableName;
SqlDataAdapter adapter = new SqlDataAdapter(queryString, myADONETConnection);
DataSet ds = new DataSet();
adapter.Fill(ds);
//Get Header Columns
string TableColumns = "";
// Get the Column List from Data Table so can create Excel Sheet with Header
foreach (DataTable table in ds.Tables)
{
foreach (DataColumn column in table.Columns)
{
TableColumns += column + "],[";
}
}
// Replace most right comma from Columnlist
TableColumns = ("[" + TableColumns.Replace(",", " Text,").TrimEnd(','));
TableColumns = TableColumns.Remove(TableColumns.Length - 2);
//MessageBox.Show(TableColumns);
//Use OLE DB Connection and Create Excel Sheet
Excel_OLE_Con.ConnectionString = connstring;
Excel_OLE_Con.Open();
Excel_OLE_Cmd.Connection = Excel_OLE_Con;
Excel_OLE_Cmd.CommandText = "Create table " + SheetName + " (" + TableColumns + ")";
Excel_OLE_Cmd.ExecuteNonQuery();
//Write Data to Excel Sheet from DataTable dynamically
foreach (DataTable table in ds.Tables)
{
String sqlCommandInsert = "";
String sqlCommandValue = "";
foreach (DataColumn dataColumn in table.Columns)
{
sqlCommandValue += dataColumn + "],[";
}
sqlCommandValue = "[" + sqlCommandValue.TrimEnd(',');
sqlCommandValue = sqlCommandValue.Remove(sqlCommandValue.Length - 2);
sqlCommandInsert = "INSERT into " + SheetName + "(" + sqlCommandValue.TrimEnd(',') + ") VALUES(";
int columnCount = table.Columns.Count;
foreach (DataRow row in table.Rows)
{
string columnvalues = "";
for (int i = 0; i < columnCount; i++)
{
int index = table.Rows.IndexOf(row);
columnvalues += "'" + table.Rows[index].ItemArray[i] + "',";
}
columnvalues = columnvalues.TrimEnd(',');
var command = sqlCommandInsert + columnvalues + ")";
Excel_OLE_Cmd.CommandText = command;
Excel_OLE_Cmd.ExecuteNonQuery();
}
}
Excel_OLE_Con.Close();
Dts.TaskResult = (int)ScriptResults.Success;
}
catch (Exception exception)
{
// Create Log File for Errors
using (StreamWriter sw = File.CreateText(Dts.Variables["User::FolderPath"].Value.ToString() + "\\" +
Dts.Variables["User::ExcelFileName"].Value.ToString() + datetime + ".log"))
{
sw.WriteLine(exception.ToString());
Dts.TaskResult = (int)ScriptResults.Failure;
}
}
}
Same Ado_Conn connection name i have write in c# script still facing error
after successfully buid script and run package and got error
Please help me out
I hope i Explain the scnerio

Answer 1

The alert shows a generic error message, therefore it is not possible to pinpoint the cause of the error.
Consider to add this line into a CATCH block:
Dts.Events.FireError(0, "Script Task Example", exception.Message + "\r" + exception.StackTrace, String.Empty, 0);
Also, perhaps it makes sense, for now, temporarily disable writing logs into a custom log file since this operation by itself can cause errors and they will not be captured by try..catch...
So the edited version will look this way:
catch (Exception exception)
{
Dts.Events.FireError(0, "Script Task", exception.Message + "\r" + exception.StackTrace, String.Empty, 0);
// Create Log File for Errors
// using (StreamWriter sw = File.CreateText(Dts.Variables["User::FolderPath"].Value.ToString() + "\\" +
// Dts.Variables["User::ExcelFileName"].Value.ToString() + datetime + ".log"))
// {
// sw.WriteLine(exception.ToString());
// Dts.TaskResult = (int)ScriptResults.Failure;
// }
}
The real reason of the exception will be routed to SSIS logs and can be tracked via SSDT output window or native SSIS Catalog logging in case if the package is deployed to a server