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How to get a list of column names on Sqlite3 database?
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PRAGMA table_info(table_name);
will get you a list of all the column names.
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“The certificate chain was issued by an authority that is not trusted” when connecting DB in VM Role
...g Let's Encrypt to get a CA signed certificate from a known trusted CA for free, and install it on the VM. Don't forget to set it up to automatically refresh. You can read more on this topic in SQL Server books online under the topic of "Encryption Hierarchy", and "Using Encryption Without Validati...
How can I sort a List alphabetically?
...untryNames, Collator.getInstance());
Solution with a TreeSet
If you are free to decide, and if your application might get more complex, then you might change your code to use a TreeSet instead. This kind of collection sorts your entries just when they are inserted. No need to call sort().
Collec...
Extract traceback info from an exception object
...dit for this part of the answer should go to Vyctor, who first posted this information. I'm including it here only because this answer is stuck at the top, and Python 3 is becoming more common.
In Python 2
It's annoyingly complex. The trouble with tracebacks is that they have references to stack f...
MySQL select one column DISTINCT, with corresponding other columns
... @Full Decent you can't, according to MySQL documentation: "The server is free to choose any value from each group, so unless they are the same, the values chosen are indeterminate.". In practice I've successfully used this kind of queries with ORDER BY clause, for instance you could add ORDER BY ...
Manually raising (throwing) an exception in Python
...ou insist.
You can preserve the stacktrace (and error value) with sys.exc_info(), but this is way more error prone and has compatibility problems between Python 2 and 3, prefer to use a bare raise to re-raise.
To explain - the sys.exc_info() returns the type, value, and traceback.
type, value, ...
Is it safe to delete a NULL pointer?
...However, despite these abrogations of your draconian ownership rules, lock free structures are provably more robust than lock based ones. And yes, my co-workers do indeed love me for the enhanced execution profile these structures provide and the rigorous thread safety they maintain, which allow eas...
Why are the Level.FINE logging messages not showing?
...s the former), which defaults to publishing log records of the level Level.INFO. You will have to configure this handler, to publish log records of level Level.FINER and higher, for the desired outcome.
I would recommend reading the Java Logging Overview guide, in order to understand the underlying...
GPL and LGPL open source licensing restrictions [closed]
...re must be released with a compatible license.
The GPL/LGPL licenses mean "free" as in "free speech", not "free beer". You can create a derivative work and sell it for large amounts of money, but you must comply with the GPL/LGPL.
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phpcms v9内容页/下载页更新时间（updatetime）为空的解决方法 - 更多技术 ...
... define('INDEX_HTML',true);
$catid = $_POST['info']['catid'] = intval($_POST['info']['catid']);
if(trim($_POST['info']['title'])=='') showmessage(L('title_is_empty'));
$category = $this->categorys[$catid];
...