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Generate GUID in MySQL for existing Data?
I've just imported a bunch of data to a MySQL table and I have a column "GUID" that I want to basically fill down all existing rows with new and unique random GUID's.
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Difference between Key, Primary Key, Unique Key and Index in MySQL
When should I use KEY , PRIMARY KEY , UNIQUE KEY and INDEX ?
8 Answers
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How to make an array of arrays in Java
...array references, initialized to the values array1, array2, array3, array4 and array5 - each of which is in itself a string array reference.
– Jon Skeet
Jan 24 '11 at 11:05
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Storing a Map using JPA
...o (in the JPA 2.0 specification)
2.6 - Collections of Embeddable Classes and Basic Types
2.7 Map Collections
10.1.11 - ElementCollection Annotation
11.1.29 MapKeyColumn Annotation
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How do i find out what all symbols are exported from a shared object?
..., a UNIX shared library, or a Windows DLL? These are all different things, and your question conflates them all :-(
For an AIX shared object, use dump -Tv /path/to/foo.o.
For an ELF shared library, use readelf -Ws /path/to/libfoo.so, or (if you have GNU nm) nm -D /path/to/libfoo.so.
For a non-ELF ...
Why use @PostConstruct?
...s are injected. In the @PostConstruct method the bean is fully initialized and you can use the dependencies.
because this is the contract that guarantees that this method will be invoked only once in the bean lifecycle. It may happen (though unlikely) that a bean is instantiated multiple times by th...
What is the dual table in Oracle?
I've heard people referring to this table and was not sure what it was about.
14 Answers
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Why can't non-default arguments follow default arguments?
...ters must be placed before any default arguments. Simply because they are mandatory, whereas default arguments are not. Syntactically, it would be impossible for the interpreter to decide which values match which arguments if mixed modes were allowed. A SyntaxError is raised if the arguments are not...
When is a Java method name too long? [closed]
..., as you not only want to convey the behaviour but also keep the project's and language's convention. So in Python you might say eligible_items_cnt but in Java you usually say getEligibleItemsCount.
– flybywire
Feb 9 '10 at 17:14
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How to empty a redis database?
I've been playing with redis (and add some fun with it) during the last fews days and I'd like to know if there is a way to empty the db (remove the sets, the existing key....) easily.
During my tests, I created several sets with a lot of members, even created sets that I do not remember the name ...