How to Dynamically Switch Databases in Entity Framework at Runtime?
Jan 14, 2025 am 06:15 AMDynamic Database Switching in Entity Framework
Managing multiple databases within a web API requires efficient runtime connection switching. This solution details how to achieve this:
-
Connection String Generation: Utilize
SqlConnectionStringBuilder
andEntityConnectionStringBuilder
to construct the appropriate connection string. -
Modifying the Data Context Connection: The
ChangeDatabase
extension method (from theConnectionTools
class) allows for dynamic alteration of the data context's connection:
// Dynamically switch the database connection var selectedDb = new MyDbEntities(); selectedDb.ChangeDatabase(initialCatalog: "new_catalog", userId: "new_user");
- Connection Scope: In a web API, each request typically operates within its own session. Consequently, the connection string isn't persistent across a user's entire interaction. It's essential to supply the connection string to your data context with each individual request.
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