MySQL Insert Into Select Transaction in C#

In MySQL, the INSERT INTO SELECT statement allows you to insert data from one table into another table. This can be useful when you want to combine data from multiple tables or when you want to copy data from one table to another.

To perform this operation in a transaction using C#, you can use the MySqlTransaction class provided by the MySQL Connector/NET. The following code snippet demonstrates how to execute an INSERT INTO SELECT statement within a transaction in C#.

using MySql.Data.MySqlClient;

// Connection string
string connectionString = "server=localhost;database=mydatabase;uid=username;password=password;";

// SQL statement for insert into select
string query = "INSERT INTO table2 (column1, column2) SELECT column1, column2 FROM table1 WHERE condition";

// Create a MySqlConnection object
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
    // Open the connection
    connection.Open();

    // Start a transaction
    MySqlTransaction transaction = connection.BeginTransaction();

    try
    {
        // Create a MySqlCommand object
        using (MySqlCommand command = new MySqlCommand(query, connection))
        {
            // Set the transaction object for the command
            command.Transaction = transaction;

            // Execute the insert into select statement
            int rowsAffected = command.ExecuteNonQuery();

            // Commit the transaction if successful
            transaction.Commit();

            // Output the result
            Console.WriteLine("Rows affected: " + rowsAffected);
        }
    }
    catch (Exception ex)
    {
        // Rollback the transaction if an exception occurs
        transaction.Rollback();
        Console.WriteLine("Transaction rolled back due to an exception: " + ex.Message);
    }
}

Make sure to replace the connectionString with your valid MySQL connection details, and modify the query variable to match your specific INSERT INTO SELECT statement.

This code snippet wraps the INSERT INTO SELECT statement within a transaction using the MySqlTransaction class. It executes the statement and commits the transaction if successful. If an exception occurs, it rolls back the transaction.

Remember to include the necessary using directives at the top of your C# file:

using MySql.Data.MySqlClient;
using System;

Make sure to install the MySQL Connector/NET package in your project before using the MySqlConnection and MySqlCommand classes.

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