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How should equals and hashcode be implemented when using JPA and Hibernate
...ve an id and thus you're using hashCode() based on that id. It's different from above and would have placed your entity in the bucket #2. Now, assuming you hold a reference to this entity elsewhere, try calling Set.contains(entity) and you'll get back false. Same goes for get() / put() / etc...
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Read only the first line of a file?
...d in the docs, unless it is the only line in the file, the string returned from f.readline() will contain a trailing newline. You may wish to use f.readline().strip() instead to remove the newline.
The with statement automatically closes the file again when the block ends.
The with statement only wo...
Default value to a parameter while passing by reference in C++
... and that is on a constructor. It is not possible to call one constructor from another, and so this technique does not work in that case.
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RedirectToAction with parameter
I have an action I call from an anchor thusly, Site/Controller/Action/ID where ID is an int .
14 Answers
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How to check whether dynamically attached event listener exists or not?
...;
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Step 4: Finally, you will need a function that can delete a listener from the storage object.
/* The function that removes a listener from a given element & its storage record. */
function removeListener (element, event, listener, options) {
/* Use the element given to retrieve the re...
what is the difference between XSD and WSDL
...chema mentioned in XSD then it is impossible to expect correct information from the company in Chicago. There is so much to do after the above said story, which an amateur or newbie have to know while coding for some thing like I said above. If you really want to know what happens later then it is ...
Why is it considered a bad practice to omit curly braces? [closed]
...ames in filesystem walks), though, where blank lines help setting them off from the main code.
– Alan Plum
Feb 5 '10 at 0:10
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Make elasticsearch only return certain fields?
...mapping. Otherwise ES will still load the _source document and load fields from there. May impact performance if returned data is relatively small to the size of a whole document.
– Zaar Hai
Aug 18 '13 at 10:19
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Storing Images in PostgreSQL
... BLOB: "The SQL standard defines (...) BLOB. The input format is different from bytea, but the provided functions and operators are mostly the same",Manual.
EDIT 2014: I have not changed the original text above today (my answer was Apr 22 '12, now with 14 votes), I am opening the answer for your c...
#if DEBUG vs. Conditional(“DEBUG”)
... release mode (i.e. no DEBUG symbol), it will forever have the call to B() from within A() omitted, even if a call to A() is included because DEBUG is defined in the calling assembly.
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