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Can I create mutilple database structure in core data?


Can I create mutilple database structure in core data?

By : user2951998
Date : November 18 2020, 03:49 PM
it should still fix some issue Yes, simply use different URLs for them (If the structure is exactly the same it's easy). Something like this should work.
code :
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:[NSString stringWithFormat:@"%@.sqlite", username]];


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How to Force Core Data to Create Sqlite Database from Model *Before* Any Data Is Persisted in Application?

How to Force Core Data to Create Sqlite Database from Model *Before* Any Data Is Persisted in Application?


By : user3398143
Date : March 29 2020, 07:55 AM
should help you out Is there a way to force Core Data to create the underlying SQLite database based on your model before you actually create any entities that need to be persisted? , Once your managedObjectContext and persistentStore is ready, just do
code :
[managedObjectContext save:&error];
does core data create a database for you?

does core data create a database for you?


By : user3547605
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Yes, it creates a table for you. You don't need to mess with such these things.
Here is the best starting tutorial: Core Data Programming Guide
How to alter the structure of Core Data SQLite database without losing data

How to alter the structure of Core Data SQLite database without losing data


By : nalin
Date : March 29 2020, 07:55 AM
Hope this helps It's a semi-complex topic and is documented under the heading: Core Data Model Versioning and Data Migration. Apple's guide is at: http://developer.apple.com/library/mac/#documentation/cocoa/conceptual/CoreDataVersioning/Articles/Introduction.html
Create a python script that create a sql dump with structure and data file from mysql database

Create a python script that create a sql dump with structure and data file from mysql database


By : JourneyOfLearningHow
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I don't see why you want to do that in Python since there is already a command for that: mysqldump. If you specify it with:
code :
mysqldump -u username -p database
mysqldump -u username -p database > file.sql
mysqldump -u username -p database | gzip --best > file.sql.gz
import subprocess

username = 'the_username'
password = 'the_password'
database = 'my_fancy_database'

with open('file.sql','w') as output:
    c = subprocess.Popen(['mysqldump', '-u',username,'-p%s'%password,database],
                         stdout=output, shell=True)
Self recursive SQL Server database table to create a tree structure, create model for this , and using this data in Deve

Self recursive SQL Server database table to create a tree structure, create model for this , and using this data in Deve


By : Jose Carlos
Date : March 29 2020, 07:55 AM
I hope this helps . For getting recursive data you can use recursive common table expression like this:
code :
DECLARE @DataSource TABLE
(
    [parentid] INT
   ,[childid] INT
   ,[name] VARCHAR(16)
);

INSERT INTO @DataSource ([parentid], [childid], [name])
VALUES (NULL, 10, 'parent A')
      ,(10, 11, 'child A1')
      ,(10, 12, 'child A2')
      ,(NULL, 13, 'parent B')
      ,(13, 14, 'sub-parent B1')
      ,(13, 15, 'sub-parent B2')
      ,(14, 16, 'child B2 - C1')
      ,(14, 17, 'child B2 - C2');

WITH RecursiveDataSource AS
(
    SELECT *
          ,1 AS [Level]
          ,ROW_NUMBER() OVER (ORDER BY(SELECT 1)) AS [FamilyID]
    FROM @DataSource 
    WHERE [parentid] IS NULL
    UNION ALL
    SELECT DS.*
          ,RDS.[Level] + 1 
          ,RDS.[FamilyID]
    FROM RecursiveDataSource RDS
    INNER JOIN @DataSource DS
        ON RDS.[childid] = DS.[parentid]
)
SELECT *
FROM RecursiveDataSource
ORDER BY [FamilyID] 
        ,[Level];
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