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Many-to-many relationship with the same model in rails?
..._a_id", :null => false
t.integer "post_b_id", :null => false
end
By default, Rails will call this table a combination of the names of the two tables we're joining. But that would turn out as posts_posts in this situation, so I decided to take post_connections instead.
Very important here ...
How do I get the YouTube video ID from a URL?
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I made an enhancement to Regex provided by "jeffreypriebe" because he needed a kind of YouTube URL is the URL of the videos when they are looking through a channel.
Well no but this is the function that I have armed.
<script type="text/javascript">
function...
SQL query for finding records where count > 1
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Use the HAVING clause and GROUP By the fields that make the row unique
The below will find
all users that have more than one payment per day with the same account number
SELECT
user_id ,
COUNT(*) count
FROM
PAYMENT
GROUP BY
account,
user_id ,...
How do I put an 'if clause' in an SQL string?
...sts(*Your condition*) (*Write your query*), you can achieve an 'if clause' by writing like this:
(*Write your insert or update query*) where not exists (*Your condition*)
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In which case do you use the JPA @JoinTable annotation?
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EDIT 2017-04-29: As pointed to by some of the commenters, the JoinTable example does not need the mappedBy annotation attribute. In fact, recent versions of Hibernate refuse to start up by printing the following error:
org.hibernate.AnnotationException:
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How to get a value of an element by name instead of ID
...ue of an element via the attribute name instead of the ID . eg if I use by id it would be $('#id').val();
9 Answers
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Spring Data: “delete by” is supported?
...ing Spring JPA for database access. I am able to find examples such as findByName and countByName, for which I dont have to write any method implementation. I am hoping to find examples for delete a group of records based on some condition.
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Correct use of Multimapping in Dapper
...e to include the first "Id" in the split clause. Even though Dapper splits by default on "Id", in this case it has to be set explicitly.
– Sbu
Nov 9 '17 at 7:47
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Delete with Join in MySQL
... to:
DELETE posts, projects FROM posts INNER JOIN [...]
Note that order by and limit don't work for multi-table deletes.
Also be aware that if you declare an alias for a table, you must use the alias when referring to the table:
DELETE p FROM posts as p INNER JOIN [...]
Contributions from C...
Get real path from URI, Android KitKat new storage access framework [duplicate]
... "Each storage backend surfaces individual files and directories by referencing them with a unique COLUMN_DOCUMENT_ID. Document IDs must be unique and not change once issued, since they are used for persistent URI grants across device reboots." taken from Storage access framework that's th...