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Deleting rows with MySQL LEFT JOIN
...`status` = 'storno');
I am not sure if that kind of sub query works in MySQL, but try it. I am assuming you have an ID column in your deadline table.
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INSERT … ON DUPLICATE KEY (do nothing)
...ses resources for the second action.
Use INSERT IGNORE ...,
Negative : MySQL will not show any errors if something goes wrong, so you cannot handle the errors. Use it only if you don’t care about the query.
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Installing PDO driver on MySQL Linux server
...install the necessary PDO parts from apt using sudo apt-get install php5-mysql
There is no limitation between using PDO and mysql_ simultaneously. You will however need to create two connections to your DB, one with mysql_ and one using PDO.
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Why is a boolean 1 byte and not 1 bit of size?
...hat bothers to pack several bools into a single byte, in my experience, is Sql Server.
Rails migrations: Undo default setting for a column
...re out of luck. You need
to DatabaseStatements#execute the
appropriate SQL statement yourself.
Examples
change_column_default(:suppliers, :qualification, 'new')
change_column_default(:accounts, :authorized, 1)
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Hidden Features of VB.NET?
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useful if you wish to catch a specific SQLException, say -2 which if i remember correctly is network timeout: Catch ex as sqlException where ex.code = -2
– Pondidum
Dec 27 '08 at 18:06
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Feedback on using Google App Engine? [closed]
... webapp libraries that are provided.
If you're used to the flexibility of SQL the datastore can take some getting used to. Nothing too traumatic! The biggest adjustment is moving away from JOINs. You have to shed the idea that normalizing is crucial.
Ben
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How does JPA orphanRemoval=true differ from the ON DELETE CASCADE DML clause
...d on.
Entity state transitions
JPA translates entity state transitions to SQL statements, like INSERT, UPDATE or DELETE.
When you persist an entity, you are scheduling the INSERT statement to be executed when the EntityManager is flushed, either automatically or manually.
when you remove an entity...
How do I save a stream to a file in C#?
...not just keep the binary data as binary data and write it back to disk (or SQL) as binary data?
EDIT: As this seems to be something people want to see... if you do just want to copy one stream to another (e.g. to a file) use something like this:
/// <summary>
/// Copies the contents of input...
How to delete a record in Django models?
...So eg if you delete by an arbitrary field, this can be way slower then the SQL counterpart... :(
– Vajk Hermecz
Mar 25 '14 at 16:22
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