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Setting default values for columns in JPA
...till has only @Column(columnDefinition='...') to which you put the literal SQL definition of the column. Which is quite unflexible and forces you to also declare the other aspects like type, short-circuiting the JPA implementation's view on that matter.
Hibernate though, has this:
@Column(length =...
method of iterating over sqlalchemy model's defined columns?
... trying to figure out how to iterate over the list of columns defined in a SQLAlchemy model. I want it for writing some serialization and copy methods to a couple of models. I can't just iterate over the obj.__dict__ since it contains a lot of SA specific items.
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How can I search Git branches for a file or directory?
...used this for a slightly different problem. I was trying to find all the *.sql files I had committed to a particular branch. So I used git log --grep='branch' --author='me' -- *.sql. Worked like a charm. git version 1.7.11.1
– thepriebe
Sep 17 '12 at 22:57
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Distinct() with lambda?
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@sudhAnsu63 this is a limitation of LinqToSql (and other linq providers). The intent of LinqToX is to translate your C# lambda expression into the native context of X. That is, LinqToSql converts your C# into SQL and executes that command natively wherever possible. ...
Return anonymous type results?
... what is the best way to return results from multiple tables using Linq to SQL?
16 Answers
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Delete/Reset all entries in Core Data?
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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...
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
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What is the function of the DBMDL File in VS database project
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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...
How to use mysql JOIN without ON condition?
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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 ...
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...