multiple-databases

问题 I have a Foreign Key from one model into another model in a differente database (I know I shouldn't do it but if I take care properly of Referential Integrity it shouldn't be a problem). The thing is that everything works fine...all the system does (relationships on any direction, the router takes care of it) but when I try to delete the referenced model (which doesn't have the foreign key attribute)...Django still wants to go throught the relationship to check if the relationship is empty,

问题 I have a Foreign Key from one model into another model in a differente database (I know I shouldn't do it but if I take care properly of Referential Integrity it shouldn't be a problem). The thing is that everything works fine...all the system does (relationships on any direction, the router takes care of it) but when I try to delete the referenced model (which doesn't have the foreign key attribute)...Django still wants to go throught the relationship to check if the relationship is empty,

问题 I have a Foreign Key from one model into another model in a differente database (I know I shouldn't do it but if I take care properly of Referential Integrity it shouldn't be a problem). The thing is that everything works fine...all the system does (relationships on any direction, the router takes care of it) but when I try to delete the referenced model (which doesn't have the foreign key attribute)...Django still wants to go throught the relationship to check if the relationship is empty,

问题 I have a Foreign Key from one model into another model in a differente database (I know I shouldn't do it but if I take care properly of Referential Integrity it shouldn't be a problem). The thing is that everything works fine...all the system does (relationships on any direction, the router takes care of it) but when I try to delete the referenced model (which doesn't have the foreign key attribute)...Django still wants to go throught the relationship to check if the relationship is empty,

问题 I have a remote read-only postgres database that is maintained from a docker instance of cardano-db-sync. I managed to connect the development database to it, it was working fine. But since it is read-only I wanted to add another database for User and other modifiable tables. this is the set up I prepared: # config/database.yml default: &default adapter: postgresql encoding: unicode pool: 5 development: <<: *default primary: database: 'db_sync' cexplorer: database: 'cexplorer' username: <%=

问题 I have a remote read-only postgres database that is maintained from a docker instance of cardano-db-sync. I managed to connect the development database to it, it was working fine. But since it is read-only I wanted to add another database for User and other modifiable tables. this is the set up I prepared: # config/database.yml default: &default adapter: postgresql encoding: unicode pool: 5 development: <<: *default primary: database: 'db_sync' cexplorer: database: 'cexplorer' username: <%=

问题 I've searched for an answer to this and all I can seem to find are questions asking whether it is better to use multiple databases or multiple tables in a single database. This isn't my question though. QUESTION 1. I want to set up a new database alongside my current DB and don't know how. I want to give a user full admin access to DB2 without seeing DB1. This way I can host a friend's site and they can create and delete as many tables as they want without disturbing my own DB. I could also

问题 I have a fairly standard Java EE6 web application using JPA 2 with dependency injection connecting to a MySQL database and everything is working fine. What I would like to do now is have this application interact with the databases of other applications we have installed at a clients site - essentially acting as a single point of control for our other application installs. What I'm struggling with is how best to perform the interaction with the other databases. Ideally I would like to create

问题 I have a fairly standard Java EE6 web application using JPA 2 with dependency injection connecting to a MySQL database and everything is working fine. What I would like to do now is have this application interact with the databases of other applications we have installed at a clients site - essentially acting as a single point of control for our other application installs. What I'm struggling with is how best to perform the interaction with the other databases. Ideally I would like to create

问题 I have (for testing purposes) many dbs with the same schema (=same tables and columns basically) on a sql server 2008 r2 instance. i would like a query like SELECT COUNT(*) FROM CUSTOMERS on all DBs on the instance. I would like to have as result 2 columns: 1 - the DB Name 2 - the value of COUNT(*) Example: DBName // COUNT (*) TestDB1 // 4 MyDB // 5 etc... Note: i assume that CUSTOMERS table exists in all dbs (except master ). 回答1: Try this one - SET NOCOUNT ON; IF OBJECT_ID (N'tempdb.dbo.