multiple-databases

问题 I'm trying to do (basically) an automated row copy from one backend to another as the backend is being used but is not fully developed (some tables are done, others not; adding the completed data into the more advanced db at the end of the day). I'd like to know what the syntax is for an SQL statement which: INSERT INTO tblMyBetterTable * IN "C:\\path_to_db\db.accdb" FROM tblMyTable IN "C:\\path_to_in_use_db\in-use-db.accdb" The syntax is not correct but I've searched for a while and can't

问题 I'm trying to use multiple database connection on yii2 framework. Under my db.php file inside the config folder, I have this piece of code: return [ 'class' => 'yii\db\Connection', 'components' => [ 'db1' => [ 'class' => 'yii\db\Connection', 'dsn' => 'mysql:host=localhost;dbname=new', 'username' => 'root', 'password' => 'password', 'charset' => 'utf8', ], 'db2' => [ 'class' => 'yii\db\Connection', 'dsn' => 'mysql:host=localhost;dbname=old', 'username' => 'root', 'password' => 'password',

问题 I have just created an ASP.NET MVC 4 & WebAPI project. After that I have added .edmx data source to project. I have multiple databases with the same schema. Dynamically I want to replace connection string using default constructor provided in EF. But in Model1.Designer.cs , every time I get error like "Member with same signature already declared". I'm unable to solve this problem. 回答1: Yes, it works! All you need to change is the connection string . And I have just tested it in order to

问题 I have the models class User extends Model { protected $connection = 'mysql'; public function areas() { return $this->belongsToMany(Area::class, 'user_areas'); } } class Area extends Model { protected $connection = 'oracle'; } the user_areas table is searched on oracle, but this are on mysql. How I can indicate the connection for the pivot table? I found this partial solution and it has worked class User extends Model { protected $connection = 'mysql' public function areas() { $instance = new

问题 I'm trying to use Spring Data JPA with 2 databases in project. But an exception is triggered when I'm trying to run the application: 07:21:47.734 [main] ERROR o.s.web.context.ContextLoader - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'deviceRepository': Injection of persistence dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [javax

问题 I am developing a Django application which will use multiple database backends. I would like to put an sqlite database on the machine running the django application, and sync to a remote mysql database. The tricky part is that this machine running the application will not always have an internet connection, so the mysql database is not always availalble. There will be multiple machines running the application, each with it's own local sqlite DB, but all using the same remote mysql DB. I haven

问题 We have a Rails app hosted on Heroku and i need to set up some analytics pages for our marketing guy. This seems to be the typical use case for a Heroku follow database The 2 databases will share the same model classes, i want only some action to query the replicated database. What is the preferred way to handle this situation in my app ? ActiveRecord::Base documentation talks about class specific connection : You can also set a class-specific connection. For example, if Course is an

问题 I've read many of the existing questions/threads on this subject, but keep in mind that none of them have directly addressed my issue. Also keep in mind that this is NOT a situation for database.yml as I won't know the DB info in advance. That said, I need a solution for DYNAMICALLY connecting to multiple databases in a Rails app. My situation is that I have multiple data logging sites, all with a simple data table (EVENTS, TIMESTAMP, VALUE). These sites need to (and will) remain as they are

问题 I am looking to run a query over multiple databases. I've seen this function; sp_MsForEachDb Which is ok, but it runs through all the databases and I only want to use some of them. Is there a way to select which databases are run? Also within those databases, we have branches (so all the tables have a BranchID column). For example, Database 1 might have branches 4, 5 and 6 and we only want branch 5. Database 2 might also have branches 4, 5 and 6, but in this one we want branches 4 and 5. Is

问题 I have an important Symfony project, in which I have different apps. I'd like to have different databases, one for each apps. I've find that I can have multiple database connections, but when I create schema, models forms and filters symfony put all these classes into /lib/folder. Is there a way for create models, forms, filters for each application based on his own schema, and put the resulting classes into somthing like /apps/myApp/lib? Thankyou very much... 回答1: You can use the "package"