大约有 40,000 项符合查询结果（耗时：0.0587秒） [XML]
Insert auto increment primary key to existing table
...ijaySharma If you created the row with auto-increment and must retrieve it by id immediately, MySQL offers LAST_INSERT_ID() for that value SELECT * FROM table_name WHERE id = LAST_INSERT_ID() and most programming language APIs offer some function/method to return that value in the application code.
...
How to choose the id generation strategy when using JPA and Hibernate
...generate identifiers of type long, short or int, given a table and column (by default hibernate_unique_key and next_hi respectively) as a source of hi values. The hi/lo algorithm generates identifiers that are unique only for a particular database.
seqhilo
uses a hi/lo algorithm to efficiently gener...
Create objective-c class instance by name?
Is it possible to create an instance of a class by name? Something like:
4 Answers
4
...
Using IQueryable with Linq
...es (which is what Enumerable uses).
The expression trees can be inspected by your chosen LINQ provider and turned into an actual query - although that is a black art in itself.
This is really down to the ElementType, Expression and Provider - but in reality you rarely need to care about this as a ...
How to find all tables that have foreign keys that reference particular table.column and have values
...OLUMN_NAME = 'ci_id' ## Find Foreign Keys linked to this Primary Key
ORDER BY
ke.referenced_table_name;
share
|
improve this answer
|
follow
|
...
C# Sort and OrderBy comparison
I can sort a list using Sort or OrderBy. Which one is faster? Are both working on same
algorithm?
7 Answers
...
How to get Core Data object from specific Object ID?
... return the object that has that ID, if it has been fetched from the store by this managedObjectContext. If anyone knows what this method is useful for, please comment.)
[eta.: Another important difference between the first method and the other two is that existingObjectWithID:error: never returns ...
Specify an SSH key for git push for a given domain
...they will get tried first because unlike other config options (which abide by "first in wins") the IdentityFile option appends to the list of identities to try. See: https://serverfault.com/questions/450796/how-could-i-stop-ssh-offering-a-wrong-key/450807#450807
...
Best practices for in-app database migration for Sqlite
...ertable.html. For deleting columns or other changes that aren't supported by the "ALTER TABLE" syntax, I create a new table, migrate date into it, drop the old table, and rename the new table to the original name.
share
...
Understanding Spring @Autowired usage
...
TL;DR
The @Autowired annotation spares you the need to do the wiring by yourself in the XML file (or any other way) and just finds for you what needs to be injected where, and does that for you.
Full explanation
The @Autowired annotation allows you to skip configurations elsewhere of what to...