How to Load Data from Excel Files when Number of Columns can decrease or order is changed in Excel Sheet - SSIS tutorial

Scenario:Link to Script

Let's say you are working for Auto Insurance Company as ETL developer, you get different excel files from different regional office those you need to load to Dbo.Customer Table in TechBrothersIT database.
Here is the definition of SQL server table.

CREATE TABLE dbo.Customer (
    id INT
    ,name VARCHAR(50)
    ,dob DATE
    )
GO

But you often face problem as you don't always get the exact columns.Sometime you get a nice excel file with Id,Name and Dob and often you get the file with only Name column and sometime you get the file with Id and name. 

You notice from above, you will be always getting the file with correct column names but sometime less or more or sometime with exact same number. 

Consider, I got three below files as shown below and need to load to dbo.Customer Table.

You notices that I did not mention the name of Sheet, It can be anything as long as it has only one sheet. As for this scenario, I am considering there will be always single sheet.


How to load Excel files dynamically to SQL Server Table when Column are not exact Same in SSIS

Let's check the data in the Sheet in each file.
Sheet Data from Customer_TechBrothersIT_NorthAmerica.xlsx - Load Excel Dynamically in SSIS

Sheet data from Customer_TechBrothersIT_Asia.xlsx - How to Load Excel Sheet Data Dynamically in SSIS


Sheet Data from Customer_TechBrothersIT_03032016.xlsx- Load Excel Dynamically in SSIS

If you notices that, in some Excel files, the sheet has columns in order as we have in SQL Server Table. In some of them the order of columns is messed up and even in some of them the columns are missing.

Now the questions is , How to Load these different sheets to single Table in SQL Server Table, What solution you will propose in this situation as ETL Developer?

Solution:

We can't handle above situation with builtin Excel Source as number of columns are not constant in our sheets. Also the Sheet name is not confirmed and we have to work hard to make that dynamic by using expressions. I will suggest to handle this situation in Script Task.

Step 1:
Let's create two variables. 
FolderPath: that will contain the folder path where our files will be dropped or put.
TableName: Provide the table name.

By using above variable, we are making our SSIS Package dynamic. You can simply change values for two variables and start loading the data to new table from your excel files. Also this is really helpful when you are deploying your SSIS Package to QA,UAT and Prod as Folder Path is often different in each environment.

Create Variables in SSIS Package to Load Excel Sheet Dynamically in SSIS Package by Script Task


Step 2:
Create ADO.NET Connection Manager so we can use in Script Task to Load data from Excel Sheets to SQLServer Table.

Create ADO.NET Connection in SSIS Package to use in Script Task for Dynamic Excel Loading

Once you will click on New ADO.NET Connection, you will be choose your SQL Server and Database. I have created DBConn as you can see in above snapshot.

Step3: Map the Variables in Script Task ( FolderPath and TableName)
Bring the Script Task on Control Flow Pane in SSIS Package and open by double clicking. Map the variables as shown below.

Map variables in Script Task to use for Dynamic Excel Loading- SSIS Tutorial 

You have noticed that I selected Microsoft Visual C# 2012 for script in Script Task. You can use VB, if you like but below code is provided in C#.


Step 4:
Click Edit Button and it will open Script Task Editor.
Under #region Namespaces, I have added below code
using System.IO;
using System.Data.OleDb;
using System.Data.SqlClient;


Under public void Main() { 
I have added below code.


String FolderPath=Dts.Variables["User::FolderPath"].Value.ToString();
            String TableName = Dts.Variables["User::TableName"].Value.ToString();
            var directory = new DirectoryInfo(FolderPath);
            FileInfo[] files = directory.GetFiles();
            
            //Declare and initilize variables
            string fileFullPath = "";
            
            //Get one Book(Excel file at a time)
            foreach (FileInfo file in files)
            {
              
                    fileFullPath = FolderPath+"\\"+file.Name;
                                   
                //Create Excel Connection
                string ConStr;
                string HDR;
                HDR="YES";
                ConStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileFullPath + ";Extended Properties=\"Excel 12.0;HDR=" + HDR + ";IMEX=0\"";
                    OleDbConnection cnn = new OleDbConnection(ConStr);

                
                //Get Sheet Name
                   cnn.Open();
                DataTable dtSheet = cnn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                string sheetname;
                sheetname="";
           foreach (DataRow drSheet in dtSheet.Rows)
            {
                if (drSheet["TABLE_NAME"].ToString().Contains("$"))
                {
                     sheetname=drSheet["TABLE_NAME"].ToString();
                } 
            }

         //Load the DataTable with Sheet Data
         OleDbCommand oconn = new OleDbCommand("select * from ["+sheetname+"]", cnn);
                    OleDbDataAdapter adp = new OleDbDataAdapter(oconn);
                    DataTable dt = new DataTable();
                    adp.Fill(dt);
                    cnn.Close();
             
                  
//Use the ADO.NET connection and Load the data from DataTable to SQL Table
  SqlConnection myADONETConnection = new SqlConnection();
  myADONETConnection = (SqlConnection)(Dts.Connections["DBConn"].AcquireConnection(Dts.Transaction) as SqlConnection);

  using (SqlBulkCopy BC = new SqlBulkCopy(myADONETConnection))
                    {
                        BC.DestinationTableName = TableName;
                        foreach (var column in dt.Columns)
                            BC.ColumnMappings.Add(column.ToString(), column.ToString());
                        BC.WriteToServer(dt);
                    }
                
            }



Step 5:
Save the code and exit Script task. Run the SSIS Package and go to SSMS and check the data in the table. 
How to load data from Excel file dynamically in SQL Server Table by Script Task in SSIS Package


As you can see that the data from three files with single sheet is loaded to our table. As you don't want to load the files again, it is good idea to move the files to some other folder after loading. you can check this link to see how the files can be archived. You can use Script Task itself or File System task to archive the files after loading.


Video Demo How to Import Excel Files to SQL Server Table with Exact Number or columns or less Columns in Excel Sheets



Check out our other posts/videos for Dynamic Excel Source and Destination
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