CSV Connector for C#

In this article you will learn how to integrate CSV data in C# (live / bi-directional connection to CSV). CSV Connector can be used to extract and output CSV data from Web URL/REST API web service calls (Web URL) or direct CSV String (variables or DB columns) or local CSV files data..

Using CSV Connector you will be able to connect, read, and write data from within C#. Follow the steps below to see how we would accomplish that.

Download  Help File 

Create ODBC Data Source (DSN) based on ZappySys CSV Driver

To get data from Csv using C# we first need to create a DSN (Data Source) which will access data from Csv. We will later be able to read data using C#. Perform these steps:

  1. Install ZappySys ODBC PowerPack.

  2. Open ODBC Data Sources (x64):
    Open ODBC Data Source

  3. Create a User Data Source (User DSN) based on ZappySys CSV Driver

    ZappySys CSV Driver
    Create new System DSN for ZappySys CSV Driver
    You should create a System DSN (instead of a User DSN) if the client application is launched under a Windows System Account, e.g. as a Windows Service. If the client application is 32-bit (x86) running with a System DSN, use ODBC Data Sources (32-bit) instead of the 64-bit version.
  4. Select Url or File.

    Read CSV API in C#

    • Paste the following Url. In this example, We are using Zip format CSV File URL, but you need to refer your CSV File/URL.

      https://zappysys.com/downloads/files/test/cust-1.csv.zip
      Click on Test Connection button to view whether the Test Connection is SUCCESSFUL or Not. ZappySys ODBC Driver - Configure CSV Driver

    Read CSV File in C#

    • You can use pass single file or multiple file path using wildcard pattern in path and you can use select single file by clicking [...] path button or multiple file using wildcard pattern in path.

      Note: If you want to operation with multiple files then use wild card pattern as below
      (when you use wild card pattern in source path then system will treat target path as folder regardless you end with slash)
      
      C:\SSIS\Test\reponse.csv (will read only single reponse.csv file)
      C:\SSIS\Test\j*.csv (all files starting with file name j)
      C:\SSIS\Test\*.csv (all files with .csv Extension and located under folder subfolder)
      
      Click on Test Connection button to view whether the Test Connection is SUCCESSFUL or Not. ZappySys ODBC Driver - Configure CSV Driver

  5. Once you configured a data source, you can preview data. Hit Preview tab, and use similar settings to preview data:
    ZappySys ODBC Driver - Preview CSV Driver

  6. Click OK to finish creating the data source

  7. That's it; we are done. In a few clicks we configured the read the CSV data using ZappySys CSV Connector.

Read data in C# from the DSN

  1. Create a new Console project and use this code to read the data:

    "CsvDSN";
    Make ZappySys Driver call in c#

  2. Press F5 to run the code and read the data:
    ZappySys Driver Output in c#

  3. Here is the code in text format:

    
    using System;
    using System.Data.Odbc;
    
    namespace ConsoleApp {
        class Program {
            static void Main() {
                var dsn = "CsvDSN";
                using (var conn = new OdbcConnection(String.Format("DSN={0}", dsn)))
                {
                    conn.Open();
                    var cmd = new OdbcCommand("SELECT * FROM Products", conn);
                    
                    //Increase the timeout duration from the default 30 seconds, which may be insufficient in certain scenarios
                    cmd.CommandTimeout=600; // 600-Seconds
                    
                    var rdr = cmd.ExecuteReader();
                    while (rdr.Read())
                    {
                        for (int i = 0; i < rdr.FieldCount; i++)
                        {
                                Console.Write("{0}\t", rdr[i]);
                        }
                        Console.WriteLine();
                    }
                }
                Console.ReadKey();
            }
        }
    }
    

  4. If you want to avoid being dependent on a DSN and creating multiple DSNs for each platform (x86, x64), then you can use a fully qualified connection string. Simply go to your DSN and copy the Connection String . Then in your C# code, pass the connection string as an argument when calling the OdbcConnection object's constructor, for example:

                
            var connectionString = "DRIVER={ZappySys CSV Driver};ServiceUrl=https://yourservices.provider.com/api/xxxx....;AuthName=Http;";
    
            using (var conn = new OdbcConnection(connectionString))
            {
            // ...
            }
        
    
    How to get ZappySys Driver Connection String?

    Please follow the instructions below to retrieve the connection string for the ZappySys driver.

    1. Click on the Windows Start menu.

    2. In the search bar, type ODBC and press Enter.

    3. From the search results, choose ODBC Data Sources or ODBC Data Sources (32-bit) or a similar option depending on your system architecture and ODBC driver configuration.

    4. Choose your data source from the list, then click on the Configure button.
    5. After opening the Data Source UI, you should copy the connection string to a Notepad or text file for reference.
    6. Click on Copy Connection String button.
      When you click 'Copy Connection String,' you may encounter the following option:
      Choose the third option All Settings to copy everything and click on OK button.
      zappysys-data-source-copy-connectionstring
      zappysys-data-source-copy-connectionstring

    That's it connection string has been successfully copied.

    How to Overcome the Long Connection String Issue

    This issue is typically caused when the connection string includes a long RefreshToken attribute (i.e. RefreshToken=xxxxxxxxxxxx...xxx, especially if it's more than 1,000 characters).

    A good solution is to supply the RefreshToken by a file. Simply copy and paste the RefreshToken into a text file and save it, and then pass that file path in the connection string instead of directly supplying the RefreshToken.

    Here is an example of a connection string that can cause the issue:

    
        var connectionString = "Driver={ZappySys CSV Driver};RefreshToken=xxxxxxxxxxxx...xxxxxxx;ServiceUrl=...;";
    
        using (var conn = new OdbcConnection(connectionString))
        {
        // ...
        }
    
    

    Here is an example of a connection string that has resolved the issue by moving the RefreshToken attribute to the file c:\my_refresh_token.txt:

    
        var connectionString = "Driver={ZappySys CSV Driver};RefreshTokenFile=c:\my_refresh_token.txt;ServiceUrl=...;";
    
        using (connectionString)
        {
        // ...
        }
    
    

Insider Insights

While using ExecuteNonQuery make sure to use output=0.

Sometime Executing `cmd.ExecuteNonQuery` in C# didn't trigger the API call immediately specifically for `INSERT`, `UPDATE`, or `DELETE` statement, as it only initiates the call when the iterator is requested. When using ExecuteNonQuery(), it's primarily intended for SQL statements that don't return data, such as UPDATE, INSERT, or DELETE. If you're not seeing any changes made by the UPDATE statement, there could be several reasons for this.

One potential reason, as you've mentioned, is related to deferred execution. In some cases, the changes made by the UPDATE statement might not be visible immediately, especially if you're not requesting any output from the query. In such cases, explicitly setting Output = 0 can force the iterator to be called, ensuring that the changes are applied.

Here's an example of how you might modify your code to include this:

using System;
using System.Data.Odbc;

namespace ConsoleApp {
    class Program {
        static void Main() {
            var dsn = "CsvDSN";
            using (var conn = new OdbcConnection(String.Format("DSN={0}", dsn)))
            {
                conn.Open();
                
                //We're currently referring to the example with the Products table. Please substitute it with the table of your choice.
                var cmd =new OdbcCommand("UPDATE Products SET ProductName='Chai' Where ProductID=1 WITH(Output=0)", conn);
                
                //Increase the timeout duration from the default 30 seconds, which may be insufficient in certain scenarios
                cmd.CommandTimeout=600; // 600-Seconds
                
                // Execute the query
                int rowsAffected = cmd.ExecuteNonQuery();

                // Check the number of rows affected
                if (rowsAffected > 0)
                {
                    Console.WriteLine("Update successful.");
                }
                else
                {
                    Console.WriteLine("No rows were updated.");
                } 
            }
            Console.ReadKey();
        }
    }
}

Configuring pagination in the CSV Driver

ZappySys CSV Driver equips users with powerful tools for seamless data extraction and management from REST APIs, leveraging advanced pagination methods for enhanced efficiency. These options are designed to handle various types of pagination structures commonly used in APIs. Below are the detailed descriptions of these options:

  1. Page-based Pagination: This method works by retrieving data in fixed-size pages from the Rest API. It allows you to specify the page size and navigate through the results by requesting different page numbers, ensuring that you can access all the data in a structured manner.

  2. Offset-based Pagination: With this approach, you can extract data by specifying the starting point or offset from which to begin retrieving data. It allows you to define the number of records to skip and fetch subsequent data accordingly, providing precise control over the data extraction process.

  3. Cursor-based Pagination: This technique involves using a cursor or a marker that points to a specific position in the dataset. It enables you to retrieve data starting from the position indicated by the cursor and proceed to subsequent segments, ensuring that you capture all the relevant information without missing any records.

  4. Token-based Pagination: In this method, a token serves as a unique identifier for a specific data segment. It allows you to access the next set of data by using the token provided in the response from the previous request. This ensures that you can systematically retrieve all the data segments without duplication or omission.

Utilizing these comprehensive pagination features in the ZappySys CSV Driver facilitates efficient data management and extraction from REST APIs, optimizing the integration and analysis of extensive datasets.

For more detailed steps, please refer to this link: How to do REST API Pagination in SSIS / ODBC Drivers

ZappySys Authentication

ZappySys offers various authentication methods to securely access data from various sources. These authentication methods include OAuth, Basic Authentication, Token-based Authentication, and more, allowing users to connect to a wide range of data sources securely.

ZappySys Authentication is a robust system that facilitates secure access to data from a diverse range of sources. It includes a variety of authentication methods tailored to meet the specific requirements of different data platforms and services. These authentication methods may involve:

  1. OAuth: ZappySys supports OAuth for authentication, which allows users to grant limited access to their data without revealing their credentials. It's commonly used for applications that require access to user account information.

  2. Basic Authentication: This method involves sending a username and password with every request. ZappySys allows users to securely access data using this traditional authentication approach.

  3. Token-based Authentication: ZappySys enables users to utilize tokens for authentication. This method involves exchanging a unique token with each request to authenticate the user's identity without revealing sensitive information.

By implementing these authentication methods, ZappySys ensures the secure and reliable retrieval of data from various sources, providing users with the necessary tools to access and integrate data securely and efficiently. For more comprehensive details on the authentication process, please refer to the official ZappySys documentation or reach out to their support team for further assistance.

For more details, please refer to this link: ZappySys Connections

Create Custom Store Procedure in ZappySys Driver

You can create procedures to encapsulate custom logic and then only pass handful parameters rather than long SQL to execute your API call.

Steps to create Custom Store Procedure in ZappySys Driver. You can insert Placeholders anywhere inside Procedure Body. Read more about placeholders here

  1. Go to Custom Objects Tab and Click on Add button and Select Add Procedure:
    ZappySys Driver - Add Store Procedure

  2. Enter the desired Procedure name and click on OK:
    ZappySys Driver - Add Store Procedure Name

  3. Select the created Store Procedure and write the your desired store procedure and Save it and it will create the custom store procedure in the ZappySys Driver:
    Here is an example stored procedure for ZappySys Driver. You can insert Placeholders anywhere inside Procedure Body. Read more about placeholders here

    CREATE PROCEDURE [usp_get_orders]
        @fromdate = '<<yyyy-MM-dd,FUN_TODAY>>'
     AS
        SELECT * FROM Orders where OrderDate >= '<@fromdate>';
    

    ZappySys Driver - Create Custom Store Procedure

  4. That's it now go to Preview Tab and Execute your Store Procedure using Exec Command. In this example it will extract the orders from the date 1996-01-01:

    Exec usp_get_orders '1996-01-01';

    ZappySys Driver - Execute Custom Store Procedure

  5. Let's generate the SQL Server Query Code to make the API call using store procedure. Go to Code Generator Tab, select language as SQL Server and click on Generate button the generate the code.
    As we already created the linked server for this Data Source, in that you just need to copy the Select Query and need to use the linked server name which we have apply on the place of [MY_API_SERVICE] placeholder.

    SELECT * FROM OPENQUERY([MY_API_SERVICE], 'EXEC usp_get_orders @fromdate=''1996-07-30''')

    ZappySys Driver - Generate SQL Server Query

  6. Now go to SQL served and execute that query and it will make the API call using store procedure and provide you the response.
    ZappySys Driver - Generate SQL Server Query

Create Custom Virtual Table in ZappySys Driver

ZappySys API Drivers support flexible Query language so you can override Default Properties you configured on Data Source such as URL, Body. This way you don't have to create multiple Data Sources if you like to read data from multiple EndPoints. However not every application support supplying custom SQL to driver so you can only select Table from list returned from driver.

If you're dealing with Microsoft Access and need to import data from an SQL query, it's important to note that Access doesn't allow direct import of SQL queries. Instead, you can create custom objects (Virtual Tables) to handle the import process.

Many applications like MS Access, Informatica Designer wont give you option to specify custom SQL when you import Objects. In such case Virtual Table is very useful. You can create many Virtual Tables on the same Data Source (e.g. If you have 50 URLs with slight variations you can create virtual tables with just URL as Parameter setting.

  1. Go to Custom Objects Tab and Click on Add button and Select Add Table:
    ZappySys Driver - Add Table

  2. Enter the desired Table name and click on OK:
    ZappySys Driver - Add Table Name

  3. And it will open the New Query Window Click on Cancel to close that window and go to Custom Objects Tab.

  4. Select the created table, Select Text Type AS SQL and write the your desired SQL Query and Save it and it will create the custom table in the ZappySys Driver:
    Here is an example SQL query for ZappySys Driver. You can insert Placeholders also. Read more about placeholders here

    SELECT
      "ShipCountry",
      "OrderID",
      "CustomerID",
      "EmployeeID",
      "OrderDate",
      "RequiredDate",
      "ShippedDate",
      "ShipVia",
      "Freight",
      "ShipName",
      "ShipAddress",
      "ShipCity",
      "ShipRegion",
      "ShipPostalCode"
    FROM "Orders"
    Where "ShipCountry"='USA'

    ZappySys Driver - Create Custom Table

  5. That's it now go to Preview Tab and Execute your custom virtual table query. In this example it will extract the orders for the USA Shipping Country only:

    SELECT * FROM "vt__usa_orders_only"

    ZappySys Driver - Execute Custom Virtual Table Query

  6. Let's generate the SQL Server Query Code to make the API call using store procedure. Go to Code Generator Tab, select language as SQL Server and click on Generate button the generate the code.
    As we already created the linked server for this Data Source, in that you just need to copy the Select Query and need to use the linked server name which we have apply on the place of [MY_API_SERVICE] placeholder.

    SELECT * FROM OPENQUERY([MY_API_SERVICE], 'EXEC [usp_get_orders] ''1996-01-01''')

    ZappySys Driver - Generate SQL Server Query

  7. Now go to SQL served and execute that query and it will make the API call using store procedure and provide you the response.
    ZappySys Driver - Generate SQL Server Query

Conclusion

In this article we discussed how to connect to CSV in C# and integrate data without any coding. Click here to Download CSV Connector for C# and try yourself see how easy it is. If you still have any question(s) then ask here or simply click on live chat icon below and ask our expert (see bottom-right corner of this page).

Download CSV Connector for C# Documentation 


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Download CSV Connector for C# Documentation 

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