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Check if a row exists, otherwise insert
I need to write a T-SQL stored procedure that updates a row in a table. If the row doesn't exist, insert it. All this steps wrapped by a transaction.
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How do you check “if not null” with Eloquent?
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If you wanted to use the DB facade:
DB::table('table_name')->whereNotNull('sent_at')->get();
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Rails has_and_belongs_to_many migration
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You need to add a separate join table with only a restaurant_id and user_id (no primary key), in alphabetical order.
First run your migrations, then edit the generated migration file.
Rails 3
rails g migration create_restaurants_users_table
Rails 4:
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What is the difference between DAO and Repository patterns?
...lection of objects.
DAO would be considered closer to the database, often table-centric.
Repository would be considered closer to the Domain, dealing only in Aggregate Roots.
Repository could be implemented using DAO's, but you wouldn't do the opposite.
Also, a Repository is generally a narro...
What was the strangest coding standard rule that you were forced to follow? [closed]
...h one you'll get, but I really really hate when I have to preface database table names with 'tbl'
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answered Oct 20 '08 at 11:41
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How to deal with page breaks when printing a large HTML table
I have a project which requires printing an HTML table with many rows.
12 Answers
12
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What is the relative performance difference of if/else versus switch statement in Java?
...ere are more than two if/else blocks glued together or its size is unpredictable, then you may highly consider a switch statement.
Alternatively, you can also grab Polymorphism. First create some interface:
public interface Action {
void execute(String input);
}
And get hold of all implemen...
parseInt vs unary plus, when to use which?
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The ultimate whatever-to-number conversion table:
EXPRS = [
'parseInt(x)',
'parseFloat(x)',
'Number(x)',
'+x',
'~~x',
'x>>>0',
'isNaN(x)'
];
VALUES = [
'"123"',
'"+123"',
'"-123"',
'"123.45"',...
Entity Framework vs LINQ to SQL
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LINQ to SQL only supports 1 to 1 mapping of database tables, views, sprocs and functions available in Microsoft SQL Server. It's a great API to use for quick data access construction to relatively well designed SQL Server databases. LINQ2SQL was first released with C# 3.0 and...
What makes a SQL statement sargable?
...sts. It will literally have to evaluate this function for every row of the table. Much better to use:
WHERE myDate >= '01-01-2008' AND myDate < '01-01-2009'
Some other examples:
Bad: Select ... WHERE isNull(FullName,'Ed Jones') = 'Ed Jones'
Fixed: Select ... WHERE ((FullName = 'Ed Jones') ...