How to Implement Dynamic MySQL Database Connections with Entity Framework 6?

Dynamic MySQL Database Connection for Entity Framework 6

When working with numerous identical schemas, establishing dynamic database connections can improve efficiency. This article provides a comprehensive explanation on how to utilize dynamic MySQL database connections with Entity Framework 6, catering to your specific scenario.

Setting Up MySQL for Entity Framework 6

Firstly, ensure you have installed the compatible MySQL .Net connector drivers, specifically version 6.8.1. Reference the necessary libraries in your project and make appropriate adjustments to your Web.config/App.config file:

• Add a custom connection string
• Configure the default connection factory
• Define the provider

Refer to the sample provided for specific implementation details.

Connecting to a Dynamically Selected Database Name

To dynamically connect to a specific schema, modify the connection string with a placeholder:

<add name="mysqlCon" connectionString="Server=localhost;Database={0};Uid=username;Pwd=password" providerName="MySql.Data.MySqlClient" />

Create a helper method to construct the connection string dynamically. Update the ApplicationDbContext to accept a database name and use the helper method for connection initialization:

public ApplicationDbContext(string dbName) : base(GetConnectionString(dbName))
{
}

public static string GetConnectionString(string dbName)
{
    var connString = ConfigurationManager.ConnectionStrings["mysqlCon"].ConnectionString.ToString();
    return String.Format(connString, dbName);
}

Resolving Database Migration Issues

If you employ database migrations, include the following class to ensure the correct context is used:

public class MigrationsContextFactory : IDbContextFactory<ApplicationDbContext>
{
    public ApplicationDbContext Create()
    {
        return new ApplicationDbContext("developmentdb");
    }
}

This will address the problem of the migration methods not receiving the database name parameter.

The above is the detailed content of How to Implement Dynamic MySQL Database Connections with Entity Framework 6?. For more information, please follow other related articles on the PHP Chinese website!