multiple-databases | 易学教程

Django - how to specify a database for a model?

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Is there a way to specify that a model (or app, even) should only ever use one particular database? I am working with a legacy database that I don't want to change. I have two databases - the 'default' is an sqlite one that could be used for admin etc, and the legacy one. I used inspectdb to create a model for (part of) the legacy database, and it has managed = False . But is there a way to specify in the model itself that it only applies to a particular database? I see that you can specify using=databasename in some query sets etc but this is no good for things like Databrowse (and possibly

Copying worksheets from multiple workbooks into current workbook

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问题 Copying worksheets from multiple workbooks into current workbook Hi I was wondering if anybody if you guys could help me out? Im trying to copy multiple workbooks and just save it into only one worksheet. I have 2000 diffrent workbooks with the diffrent amount of rows, The ammount of cells is the same and it dosent change and they are all at the first sheet in every workbook. Im new with this kind of stuff so i'm thankfull for all help u can offer, I cant make it work. I'm using excel 2010

CodeIgniter: Multiple Databases - Accessing database config in a second database

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问题 I've been looking into using multiple databases with CodeIgniter. If I know what the databases are ahead of time, then I can set the information in the config file and then call whichever database group I need. In my situation, however, I need to store that database information in another database. It is sort of a master database with general information about a customer including the database and credentials that the customer's data is stored in. This vendor can then add customers whenever

How to configure transaction management for working with 2 different db in Spring?

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I have 2 databases (MySql and HSQLDB). I configured 2 data sources and 2 EntityManagerFactory beans. I can also configure 2 correspondent JpaTransactionManager beans. But I don't know how to specify which of them should be used to manage transactions for concrete service-class. I want to use @Transactional annotation for that purpose, but I actually can specify only one of txManagers: <tx:annotation-driven transaction-manager="manager"/> What is the way out from this situation? The javadoc for JpaTransactionManager has some advice on this: This transaction manager is appropriate for

Can multiple (two) persistent stores be used with one object model, while maintaining relations from one to the other?

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Introduction My iOS project ships with a Core Data persistent store weighing some 160MB in SQLite format. There is a ton of grouped information in there, in which users should be able to mark favorites. For this, I need (at least part of) the database to have write capabilities. But of course persistent stores that ship in the application bundle are by design read-only. If you want the store to have read-write capabilities, you should copy it to, e.g. the app's documents folder. I don't want to do this, because then the app would be twice the size, while the main part of that database is read

Migrating multiple databases using doctrine2 with Symfony2

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问题 I have 2 databases db1 and db2 in symfony2 + doctrine2 and both databases are different from each other in terms of tables and their fields. I need to work on migration. Things work fine as long as there is one database. But it does not works when there are more than one databases. Also, is there any way where I can provide entity manager specific migration settings. Or is there any way through which I can provide connection or entity manager in the migration class. 回答1: You can provide an

Can multiple (two) persistent stores be used with one object model, while maintaining relations from one to the other?

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问题 Introduction My iOS project ships with a Core Data persistent store weighing some 160MB in SQLite format. There is a ton of grouped information in there, in which users should be able to mark favorites. For this, I need (at least part of) the database to have write capabilities. But of course persistent stores that ship in the application bundle are by design read-only. If you want the store to have read-write capabilities, you should copy it to, e.g. the app's documents folder. I don't want

Making an Entity Framework Model span multiple databases

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Is it valid to do something such as CREATE SYNONYM [dbo].[MyTable] FOR [AnotherDatabase].dbo.[MyTable] and then modify Entity Framework's edmx file to read this object like it would any other table? I did a quick sample test and it seems to work fine for selecting and updating, but I wanted to know if there was any reason why I shouldn't be doing this I am getting the table definition by creating an edmx file pointing to the 2nd database, building out the entities there, then copy/pasting the definition into the 1st database's edmx file. UPDATE If anyone is interested, I wrote up what I did to

Django - how to specify a database for a model?

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问题 Is there a way to specify that a model (or app, even) should only ever use one particular database? I am working with a legacy database that I don't want to change. I have two databases - the 'default' is an sqlite one that could be used for admin etc, and the legacy one. I used inspectdb to create a model for (part of) the legacy database, and it has managed = False . But is there a way to specify in the model itself that it only applies to a particular database? I see that you can specify

Multiple database connection in Rails

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问题 I'm using active_delegate for multiple connection in Rails. Here I'm using mysql as master_database for some models,and postgresql for some other models. Problem is that when I try to access the mysql models, I'm getting the error below! Stack trace shows that, it is still using the postgresql adapter to access my mysql models! RuntimeError: ERROR C42P01 Mrelation "categories" does not exist P15 F.\src\backend\parser\parse_relation.c L886 RparserOpenTable: SELECT * FROM "categories"