大约有 40,000 项符合查询结果（耗时：0.0315秒） [XML]
How can I find which tables reference a given table in Oracle SQL Developer?
...in ('P', 'U')
and table_name = :r_table_name
and owner = :r_owner
)
order by table_name, constraint_name
Where r_owner is the schema, and r_table_name is the table for which you are looking for references. The names are case sensitive
Be careful because on the reports tab of Oracle SQL D...
What is a serialVersionUID and why should I use it?
...I wouldn't expect it to say you need one - but it may be suggesting one in order to help you serialize exceptions correctly. If you're not going to serialize them, you really don't need the constant.
– Jon Skeet
Jun 15 '14 at 18:43
...
Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
...It is not a magic bullet. All it will do is escape dangerous characters in order that they can be safe to use in a single query string. However, if you do not sanitise your inputs beforehand, then you will be vulnerable to certain attack vectors.
Imagine the following SQL:
$result = "SELECT fields...
How should I store GUID in MySQL tables?
...erred flavour
To follow the code better, take the example given the digit-ordered GUID below. (Illegal characters are used for illustrative purposes - each place a unique character.) The functions will transform the byte ordering to achieve a bit order for superior index clustering. The reordered g...
Operation on every pair of element in a list
...,1 3,2 3,3 3,4
4,1 4,2 4,3 4,4
permutations() generates all unique orderings of each unique pair of elements, eliminating the x,x duplicates:
. 1,2 1,3 1,4
2,1 . 2,3 2,4
3,1 3,2 . 3,4
4,1 4,2 4,3 .
Finally, combinations() only generates each unique pair of elements, in ...
NumPy array initialization (fill with identical values)
...Rolf Bartstra.)
a=np.empty(n); a.fill(5) is fastest.
In descending speed order:
%timeit a=np.empty(1e4); a.fill(5)
100000 loops, best of 3: 5.85 us per loop
%timeit a=np.empty(1e4); a[:]=5
100000 loops, best of 3: 7.15 us per loop
%timeit a=np.ones(1e4)*5
10000 loops, best of 3: 22.9 us per lo...
Does bit-shift depend on endianness?
... new value is stored back in memory, which is where the little endian byte order comes into effect again.
Update, thanks to @jww: On PowerPC the vector shifts and rotates are endian sensitive. You can have a value in a vector register and a shift will produce different results on little-endian and...
Differences between C++ string == and compare()?
...to one another" -- although idiomatic C++ for this is to use a strict weak order (like std::less, which is also a total order in this case) rather than a three-way comparator. compare() is for operations modeled on std::qsort and std::bsearch, as opposed to those modeled on std:sort and std::lower_b...
Get record counts for all tables in MySQL database
...
add "select * from (" at beginning and ") as output order by exact_row_count desc" at the end of generated query after removing last UNION to get order by table count desc
– Raghavendra
Jun 22 '18 at 5:42
...
IntelliJ IDEA with Junit 4.7 “!!! JUnit version 3.8 or later expected:”
...xample.intellijgradletest.MainActivityTest"
– Heath Borders
Feb 4 '14 at 15:38
7
In IDEA 14.0.3 f...