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On Duplicate Key Update same as insert
I've searched around but didn't find if it's possible.
8 Answers
8
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How to serialize SqlAlchemy result to JSON?
..."BaseQuery" whenever it hits a relationship with the non-flat methods, any ideas?
– Ben Kilah
Nov 4 '13 at 23:29
1
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How to delete duplicate rows in SQL Server?
How can I delete duplicate rows where no unique row id exists?
23 Answers
23
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SQLAlchemy: cascade delete
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The problem is that sqlalchemy considers Child as the parent, because that is where you defined your relationship (it doesn't care that you called it "Child" of course).
If you define the relationship on the Parent class instead, it will work:
children = rel...
How to exclude a module from a Maven reactor build?
...;
<modules>
...
<profiles>
<profile>
<id>expensive-modules-to-build</id>
<modules>
<module>data</module>
</modules>
</profile>
</profiles>
</project>
You should then check out ways you...
Select random row from a sqlite table
...extend this solution to a join? When using SELECT a.foo FROM a JOIN b ON a.id = b.id WHERE b.bar = 2 ORDER BY RANDOM() LIMIT 1; I always get the same row.
– Helmut Grohne
Sep 19 '13 at 8:18
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How do I execute inserts and updates in an Alembic upgrade script?
...ly straightforward to adapt this to the other forms.
Note that Alembic provides some basic data functions: op.bulk_insert() and op.execute(). If the operations are fairly minimal, use those. If the migration requires relationships or other complex interactions, I prefer to use the full power of mo...
Index on multiple columns in Ruby on Rails
...columns in sequence starting at the beginning. i.e. if you index on [:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
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jQuery Selector: Id Ends With?
Is there a selector that I can query for elements with an ID that ends with a given string?
9 Answers
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Set select option 'selected', by value
...an easier way that doesn't require you to go into the options tag:
$("div.id_100 select").val("val2");
Check out the this jQuery method.
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