multiple-databases

问题 I have two database each with their own dbcontext. I've setup two migration configurations. I can add a migration for the first db ust fine ( Add-Migration DB1_InitialCreate -ConfigurationTypeName DB1Configuration ). When I try to create an initial migration with the second db using: Add-Migration DB2_InitialCreate -ConfigurationTypeName DB2Configuration , I get the following error: Unable to generate an explicit migration because the following explicit migrations are pending:

问题 I have an iOS project with a large, preloaded database and a small user database (both CoreData SQLite stores). Previous questions have suggested using configurations to control which Entities are used with which store. I'm having trouble getting that to work. Here's what I've been trying... - (NSManagedObjectModel *)managedObjectModel { if (_managedObjectModel != nil) return _managedObjectModel; // set up the model for the preloaded data NSURL *itemURL = [[NSBundle mainBundle] URLForResource

问题 I need to write a join query of two tables from two databases and fetch the joined data. For eg, consider I have a database db1 which has some tables named companies, plans, customers. Suppose I need to join the two tables companies and plans with another table 'cdr' on another database db2 by grouping them using a similar column. The query which I'm running right now is given below: function get_per_company_total_use ($custid) { $this->DB1->select('ph_Companies.CompanyName'); $this->DB1-

问题 I need to write a join query of two tables from two databases and fetch the joined data. For eg, consider I have a database db1 which has some tables named companies, plans, customers. Suppose I need to join the two tables companies and plans with another table 'cdr' on another database db2 by grouping them using a similar column. The query which I'm running right now is given below: function get_per_company_total_use ($custid) { $this->DB1->select('ph_Companies.CompanyName'); $this->DB1-

问题 I have a problem with my query and I need to join two tables from different databases now my problem is how can I execute my query. I got my syntax format from here Please visit first this link so you could understand why my SQL syntax is like this http://www.x-developer.com/php-scripts/sql-connecting-multiple-databases-in-a-single-query Im using CodeIgniter and here is an Idea of what my query looks like: Notice the way I'm selecting my columns: DATABASE_NAME.TABLE_NAME.COLUMN_NAME

问题 I have an application that runs Spring MVC. I need it to access 2 different databases in my app (one is a PostgreSQL and the other one is a MySQL database). How do I configure this using just annotations or application.properties file? Regards. 回答1: Here is the example code for having multiple Database/datasource on Spring-Boot I hope it helps! application.properties spring.ds_items.driverClassName=org.postgresql.Driver spring.ds_items.url=jdbc:postgresql://srv0/test spring.ds_items.username

问题 I have WordPress instances with each in its own database. For an update I need to query all active plugins, that are stored in a table 'wp_options' and accessible via WHERE option_name='active_plugins' How can I access all active plugin settings (spread over multiple databases) and output them in one single SQL result? I know the database.tablename syntax, but how do I go on from there with the above Where statement? A request in a single database would look like this: SELECT option_value

问题 I am developing this wrapper around tempfile in Stata to handle multiple datasets at the same time without having to save them in current directory. So in essence I want Stata to mimic SAS, and that is the reason the program name is work; the initial code is without any options and minimal functionality. I have adhere to your advice not to tokenize and program works; however the issue is once I recall the tempfile in further program, this program (work) do not pass the handle to the next to

问题 I'm working on a project that needs two databases - one for the "logged out" portion and one for the logged in. I need the auth (and therefore contenttypes) app synched to both databases, which is working fine. However, the management commands for auth and contenttypes that create the default Permission and ContentType objects aren't running on the logged in database, only the default one. Do I have this right? My database router LOGGED_IN_APPS = ('avatar', 'guardian', 'money', 'ipn',

问题 In here I have configured two databases in mongodb. As described in this tutorial (link). So basically I override the MongoDataAutoConfiguration and MongoProperties implementations. The property yml file : spring: autoconfigure: exclude: org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration mongodb: primary: host: 127.0.0.1 port: 27017 database: db_admin_crm secondary: host: 127.0.0.1 port: 27017 database: lead_forms MultipleMongoProperties class : @Data @ConfigurationProperties