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How to test an SQL Update statement before running it?
...t using the same WHERE clause as the UPDATE.
So if you UPDATE is
UPDATE foo
SET bar = 42
WHERE col1 = 1
AND col2 = 'foobar';
The following will show you which rows will be updated:
SELECT *
FROM foo
WHERE col1 = 1
AND col2 = 'foobar';
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What's the best way to build a string of delimited items in Java?
...ava 8 you can use String.join():
List<String> list = Arrays.asList("foo", "bar", "baz");
String joined = String.join(" and ", list); // "foo and bar and baz"
Also have a look at this answer for a Stream API example.
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How to turn off the Eclipse code formatter for certain sections of Java code?
...hat you want.
Else there is this ugly hack
String query = //
"SELECT FOO, BAR, BAZ" + //
" FROM ABC" + //
" WHERE BAR > 4";
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Static and Sealed class differences
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static class Foo : object { } is valid, but is essentially static class Foo { }.
– themefield
Apr 24 '19 at 17:41
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Undefined, unspecified and implementation-defined behavior
... @Celeritas: Hyper-modern compilers can do better than that. Given int foo(int x) { if (x >= 0) launch_missiles(); return x << 1; } a compiler can determine that since all means of invoking the function that don't launch the missiles invoke Undefined Behavior, it can make the call to la...
how do I use the grep --include option for multiple file types?
... in this case, because only files literally named something like --include=foo.html would match. To be safe, quote the * (which can you do individually with \*). As an added bonus this makes it visually clearer that is not the shell that should perform the globbing in this case.
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Getting a list of files in a directory with a glob
... hasSuffix and hasPrefix methods? Something like (if you're searching for "foo*.jpg"):
NSString *bundleRoot = [[NSBundle mainBundle] bundlePath];
NSArray *dirContents = [[NSFileManager defaultManager] directoryContentsAtPath:bundleRoot];
for (NSString *tString in dirContents) {
if ([tString has...
Array Size (Length) in C#
...
With the Length property.
int[] foo = new int[10];
int n = foo.Length; // n == 10
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multiprocessing.Pool: When to use apply, apply_async or map?
...alling get().
For example:
import multiprocessing as mp
import time
def foo_pool(x):
time.sleep(2)
return x*x
result_list = []
def log_result(result):
# This is called whenever foo_pool(i) returns a result.
# result_list is modified only by the main process, not the pool workers....
Output to the same line overwriting previous output?
...< 3.0 a comma at the end of the statement will prevent a "\n": print "foo", However you still need to flush after that to see the change: sys.stdout.flush()
– Tobias Domhan
Jul 24 '13 at 21:52
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