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psycopg2: insert multiple rows with one query
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New execute_values method in Psycopg 2.7:
data = [(1,'x'), (2,'y')]
insert_query = 'insert into t (a, b) values %s'
psycopg2.extras.execute_values (
cursor, insert_query, data, template=None, page_size=100
)
The python...
What's the difference between and
...t; are nonreifiable.
For example, this code would work
List aList = new ArrayList<>();
boolean instanceTest = aList instanceof List<?>;
but this gives an error
List aList = new ArrayList<>();
boolean instancetest = aList instanceof List<? extends Object>;
for more...
How do I use Maven through a proxy?
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For details of setting up a proxy for Maven, see the mini guide.
Essentially you need to ensure the proxies section in either the global settings ([maven install]/conf/settings.xml), or user settings (${user.home}/.m2/settings.xml) is configured correctly. It is better to do this in ...
lsof survival guide [closed]
...th -c
lsof -c syslog-ng
The -p switch lets you see what a given process ID has open, which is good for learning more about unknown processes:
lsof -p 10075
The -t option returns just a PID
lsof -t -c Mail
Using the -t and -c options together you can HUP processes
kill -HUP $(lsof -t -c ssh...
Make multiple-select to adjust its height to fit options without scroll bar
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Old, but this will do what you're after without need for jquery. The hidden overflow gets rid of the scrollbar, and the javascript makes it the right size.
<select multiple='multiple' id='select' style='overflow:hidden'>
<option value='foo'>foo</option>
<option value='bar'...
Compare if two variables reference the same object in python
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While the two correct solutions x is z and id(x) == id(z) have already been posted, I want to point out an implementation detail of python. Python stores integers as objects, as an optimization it generates a bunch of small integers at its start (-5 to 256) and points...
initializing a boolean array in java
...boolean[] instead so that all values defaults to false:
boolean[] array = new boolean[size];
Or use Arrays#fill() to fill the entire array with Boolean.FALSE:
Boolean[] array = new Boolean[size];
Arrays.fill(array, Boolean.FALSE);
Also note that the array index is zero based. The freq[Global.i...
Add 2 hours to current time in MySQL?
...l = function(e) {
var $elem = $('.new-login-left'),
docViewTop = $window.scrollTop(),
docViewBottom = docViewTop + $window.height(),
...
Overwrite single file in my current branch with the same file in the master branch?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f13847425%2foverwrite-single-file-in-my-current-branch-with-the-same-file-in-the-master-bran%23new-answer', 'question_page');
}
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Is there an eval() function in Java? [duplicate]
...ass and evaluate it as a Javascript string.
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
Object result = engine.eval("4*5");
There may be a better way, but this one works.
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