大约有 3,551 项符合查询结果(耗时:0.0313秒) [XML]

https://stackoverflow.com/ques... 

Delete/Reset all entries in Core Data?

... You can delete the SQLite file - but I choose to do it by purging the tables individually with a functions: - (void) deleteAllObjects: (NSString *) entityDescription { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEn...
https://stackoverflow.com/ques... 

How do I specify the Linq OrderBy argument dynamically?

...comes to Linq expressions interpreted by providers, like Entity Framework (sql server, or other ) ?? – a.boussema Apr 14 '13 at 19:03 ...
https://stackoverflow.com/ques... 

What is the function of the DBMDL File in VS database project

... When creating a new SQL 2008 Database Project VisualSVN automatically elects not to check this file in so that also suggests to me that it's not a good idea to check it in to source control. – rohancragg No...
https://stackoverflow.com/ques... 

How to use mysql JOIN without ON condition?

... MySQL documentation covers this topic. Here is a synopsis. When using join or inner join, the on condition is optional. This is different from the ANSI standard and different from almost any other database. The effect is a ...
https://stackoverflow.com/ques... 

Unique Key constraints for multiple columns in Entity Framework

...Columns"); EF 6 and below: First approach: dbContext.Database.ExecuteSqlCommand(string.Format( @"CREATE UNIQUE INDEX LX_{0} ON {0} ({1})", "Entitys", "FirstColumn, SecondColumn")); This approach is very fast and useful but the main pr...
https://stackoverflow.com/ques... 

Setting up foreign keys in phpMyAdmin?

...in lets you define foreign keys using their "relations" view. But since, MySQL only supports foreign constraints on "INNO DB" tables, the first step is to make sure the tables you are using are of that type. To setup a foreign key so that the PID column in a table named CHILD references the ID colu...
https://stackoverflow.com/ques... 

What is the syntax for “not equal” in SQLite?

... @ban-geoengineering <> is SQL Ansi standard and != is not. Of course <> is more professional – edc65 Jan 29 '18 at 21:49 ...
https://stackoverflow.com/ques... 

How to fix: “No suitable driver found for jdbc:mysql://localhost/dbname” error when using pools? [du

...1.3/drizzle-jdbc-1.3.jar && wget http://central.maven.org/maven2/mysql/mysql-connector-java/5.1.27/mysql-connector-java-5.1.27.jar – jmojico Dec 17 '19 at 16:38 ...
https://stackoverflow.com/ques... 

Force drop mysql bypassing foreign key constraint

...P, but the answer below is actually correct for the question "Force drop mysql bypassing foreign key constraint". – Val Redchenko Dec 18 '17 at 12:27 ...
https://stackoverflow.com/ques... 

Rails :include vs. :joins

...ns and include is that using the include statement generates a much larger SQL query loading into memory all the attributes from the other table(s). For example, if you have a table full of comments and you use a :joins => users to pull in all the user information for sorting purposes, etc it wi...