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What issues should be considered when overriding equals and hashCode in Java?
...ects are not modified, then it must keep returning the same value). Furthermore, o.equals(null) must always return false.
hashCode() (javadoc) must also be consistent (if the object is not modified in terms of equals(), it must keep returning the same value).
The relation between the two methods i...
How to add multi line comments in makefiles
... and write whatever you want in the comment (including $ signs, colons and more which all have a meaning for make) then you must comment every single line. So why the ifeq...:)
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Select DISTINCT individual columns in django?
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How to catch SQLServer timeout exceptions
...de, it seems to me that it's reporting Interop-Level errors. So it may be more on the level of COM errors or that a provider encountered an exception (generally) instead of a specific error relating to what you're doing.
– Eric Tuttleman
Jun 18 '10 at 18:23
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What jsf component can render a div tag?
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How to concatenate strings with padding in sqlite
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Just one more line for @tofutim answer ... if you want custom field name for concatenated row ...
SELECT
(
col1 || '-' || SUBSTR('00' || col2, -2, 2) | '-' || SUBSTR('0000' || col3, -4, 4)
) AS my_column
FROM
mytable;
T...
How do I create a datetime in Python from milliseconds?
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Rails Model find where not equal
...your example:
GroupUser.where("groups_users.user_id != ?", me)
Or a bit more verbose:
GroupUser.where("#{table_name}.user_id IS NOT ?", me)
Note that if you are using a hash, you don't need to worry about that because Rails takes care of it for you:
GroupUser.where(user: me)
In Rails 4, as ...
CATALINA_OPTS vs JAVA_OPTS - What is the difference?
...it only effects the end of a run, not the start.
The second difference is more subtle. Other applications may also use JAVA_OPTS, but only Tomcat will use CATALINA_OPTS. So if you're setting environment variables for use only by Tomcat, you'll be best advised to use CATALINA_OPTS, whereas if you're...
How to check if command line tools is installed
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