Connecting to IBM i Series (AS400 / DB2) from .NET Core 3.1 can be achieved using the IBM Data Server Provider for .NET Core. This provider allows you to connect to DB2 databases on IBM i systems. Here's a step-by-step guide on how to establish a connection:

  1. Install IBM.Data.DB2.Core Package: First, ensure that you have installed the IBM.Data.DB2.Core package in your .NET Core project. You can do this using the NuGet Package Manager or by adding the following line to your project file:

    xml
    <PackageReference Include="IBM.Data.DB2.Core" Version="3.1.0" />
  2. Set Up the Connection String: Create a connection string with the necessary information to connect to your IBM i Series (AS400 / DB2) database. The connection string should include details such as the server address, user ID, password, and database name.

    For example:

    csharp
    string connectionString = "Server=myserver;Database=mydatabase;UID=myusername;PWD=mypassword";

    Replace myserver, mydatabase, myusername, and mypassword with your specific values.

  3. Establish the Connection: Use the DB2Connection class from the IBM.Data.DB2.Core namespace to establish the connection to the database.

    csharp
    using IBM.Data.DB2.Core; // ... try { using (var connection = new DB2Connection(connectionString)) { connection.Open(); // Perform database operations here } } catch (DB2Exception ex) { // Handle any exceptions that occur during the connection process Console.WriteLine($"DB2 Exception: {ex.Message}"); }
  4. Perform Database Operations: Once the connection is open, you can perform various database operations using the DB2Connection object. For example, you can create and execute SQL queries, read data, and update records.

    csharp
    using (var command = connection.CreateCommand()) { command.CommandText = "SELECT * FROM MyTable"; using (var reader = command.ExecuteReader()) { while (reader.Read()) { // Process the data } } }

Remember to handle any exceptions that may occur during the connection process or while performing database operations.

Additionally, ensure that your IBM i Series (AS400 / DB2) system is properly configured to accept incoming connections and that you have the necessary permissions and credentials to access the database. The specific connection details may vary depending on your setup and the version of the IBM.Data.DB2.Core package you are using.

Please note that the IBM.Data.DB2 namespace is specifically for .NET Framework applications. For .NET Core 3.1 and later, you should use IBM.Data.DB2.Core as shown in the examples above.

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