integrity

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In the question How to Set Up Primary Keys in a Relation , PerformanceDBA talked about Relational Integrity and pointed out that it is different from Referential Integrity . I have heard of Referential Integrity , which is related to Foreign Keys . But Relational Integrity seems strange to me. In this question Are relational integrity and referential integrity the same thing? , Chris said the two are the same thing. The terminologies and definitions in the database world are really confusing me. Could someone explain the Relational Integrity

We are currently developing an application in which multiple entities have associated opening hours. Opening hours may span multiple days, or may be contained within a single day. Ex. Opens Monday at 6:00 and closes at Friday at 18:00. Or Opens Monday at 06:00 and closes Monday at 15:00. Also, an entity may have multiple sets of opening hours per day. So far, the best design I have found, is to define an opening hour to consist of the following: StartDay, StartTime, EndDay and EndTime. This design allows for all the needed flexibility. However, data integrity becomes an issue. I cannot seem to

I have seen a feature in different web applications including Wordpress (not sure?) that warns a user if he/she opens an article/post/page/whatever from the database, while someone else is editing the same data simultaneously. I would like to implement the same feature in my own application and I have given this a bit of thought. Is the following example a good practice on how to do this? It goes a little something like this: 1) User A enters a the editing page for the mysterious article X. The database table Events is queried to make sure that no one else is editing the same page for the

At first, some background: My Android app has DB table with a lot of four-column rows. It sends requests to the server and server responds only when all of these four values are "valid". A few of the thousands users reported that something doesn't work for them (since awhile they are not getting the results from the server) - I was trying to figure out what's causing the problem and it turned out that the only possible cause is the DB corruption that's not being detected. In ACRA logs I've got some messages with SQL errors, but these were about application not being able to open the file

I'm hoping maybe someone has a quick answer for this but essentially when I turn on optimizations, I get the following error: [elxr] (error) small data area overflow: 0xfff9f6fc (signed) didn't fit in 16 bits while performing relocation in file test_main.o at location __sti___13_test_main_cpp_252229d3+0xc, to reference symbol oe_init_intconn A similar error occurs when I put in this linker directive as well: -auto_sda Their manual doesn't make any mention of this linker error. I'm using Integrity 5.10 This linker error is usually not related to the -Olink optimization -auto_sda . The linker

In my django project, I use mysql db for production, and sqlite for tests. Problem is, some of my code rely on model integrity checking. It works well with mysql, but integrity errors are not thrown when the same code is executed in tests. I know that foreign keys checking must be activated in sqlite : PRAGMA foreign_keys = 1; However, I don't know where is the best way to do this activation ( same question here ). Moreover, the following code won't work : def test_method(self): from django.db import connection cursor = connection.cursor() cursor.execute('PRAGMA foreign_keys = ON') c = cursor