How to specify the database associated with the model in Beego ORM?

How to elegantly manage multiple database connections under the Beego ORM framework and ensure that the model is associated with the correct database? This article will explain in detail how to implement accurate mapping between models and databases in Beego ORM to avoid table building errors caused by confusing database connections.

Beego ORM does not directly specify the database when registering the model, but cleverly uses the alias of database connections to implement multi-database management. The key lies in orm.RegisterDataBase function.

Core step: Use the orm.RegisterDataBase function to register multiple database connections and set a unique alias for each connection (for example: "default", "db1", "db2"). The ORM then automatically selects the correct database connection based on the database alias used in the model code.

The following example demonstrates how to connect two databases and associate the model with the database via an alias:

 import (
    "github.com/astaxie/beego/orm"
)

func init() {
    // Register the first database connection, alias "default"
    orm.RegisterDataBase("default", "mysql", "username:password@tcp(127.0.0.1:3306)/db_name?charset=utf8&loc=Local")

    // Register the second database connection, alias "db2"
    orm.RegisterDataBase("db2", "mysql", "username:password@tcp(127.0.0.1:3306)/db_name2?charset=utf8&loc=Local")

    // Model registration:
    // orm.RegisterModel(new(YourModel)) // default to use the "default" database // orm.RegisterModelWithDBName("db2", new(YourModel2)) // explicitly specify the "db2" database // or specify the database during model operation:
    // o := orm.NewOrmWithDBName("db2")
    // o.QueryTable(new(YourModel2)).All(&yourModels)
}

With this approach, you can easily manage multiple databases and ensure that each model is connected to its corresponding database accurately. If the database is not specified explicitly, a database connection named "default" is used by default. To improve the readability and maintainability of the code, it is recommended to explicitly specify the database connection alias when needed.

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