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How to list all methods for an object in Ruby?
..._of", "execute_simple_calculation", "attr_protected",
"reflections", "table_name_prefix", ...
Note that methods is a method for Classes and for Class instances.
Here's the methods that my User class has that are not in the ActiveRecord base class:
>> User.methods - ActiveRecord::Base...
Curly braces in string in PHP
.... I use this pattern when the class attributes map to fields in a database table. While it is possible to store arrays in a database using serialization, it is inefficient, and pointless if the individual fields must be indexed. I often add an array of the field names, keyed by the iterator, for the...
What does principal end of an association means in 1:1 relationship in Entity framework
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@Ladislav, I need to make two independant tables that both have an optional reference to each other (one to one), I want them both to have their own PKs each, how is this possible? I posted a separate question.
– Shimmy Weitzhandler
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SQL : BETWEEN vs =
...r a range. This is especially true if you have similar field names in your table.
If, say, our table has both a transactiondate and a transitiondate, if I read
transactiondate between ...
I know immediately that both ends of the test are against this one field.
If I read
transactiondate>='2...
When should an IllegalArgumentException be thrown?
...m and double price. The price for corresponding item is read from database table. I simply multiply the total number of item purchased with the price value and return the result. Although I am always sure at my end(Application end) that price field value in the table could never be negative .But wha...
Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?
...) - square(avg(t2.monret))))),
current_timestamp,@MaxDate
from Table1 t1 join Table1 t2 on t1.Date = traDate
group by t1.index_id,t2.index_id
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Virtual functions and performance - C++
...ual is a per-function attribute. A function only needs to be defined via vtable if it's marked as virtual or if it's overriding a base class that has it as virtual. You'll often see classes that have a group of virtual functions for public interface, and then a lot of inline accessors and so on. (...
Too many 'if' statements?
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If you cannot come up with a formula, you can use a table for such a limited number of outcomes:
final int[][] result = new int[][] {
{ 0, 0, 1, 2 },
{ 0, 0, 2, 1 },
{ 2, 1, 3, 3 },
{ 1, 2, 3, 3 }
};
return result[one][two];
...
How to make join queries using Sequelize on Node.js
...sted, but what it does is basically just aliasing all columns of the users table to make sure they are placed into the correct model when returned and not mixed up with the posts model
Other than that you'll notice that it does a JOIN instead of selecting from two tables, but the result should be t...
Difference between CTE and SubQuery?
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The main advantage of the Common Table Expression (when not using it for recursive queries) is encapsulation, instead of having to declare the sub-query in every place you wish to use it, you are able to define it once, but have multiple references to it.
H...