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How to change the style of alert box?
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the custom alert in the answer is not compatable to the native alert. The native alert and prompt are block-and-wait.
– Beeno Tung
Jun 17 '19 at 8:32
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Still Reachable Leak detected by Valgrind
... reachable" memory can be considered a memory leak: assume you have a hash table where you add pointers to heap allocated memory as value. If you keep inserting new entries on the table, but won't remove and free those you don't need anymore, it can grow indefinitely, leaking heap memory event if th...
What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?
...ny result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable).
ExecuteNonQuery is typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.).
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Why is std::map implemented as a red-black tree?
...d red black probably only remains for historical reasons.
Why not a hash table?
A type only requires < operator (comparison) to be used as a key in a tree. However, hash tables require that each key type has a hash function defined. Keeping type requirements to a minimum is very important for ...
Explanation of JSONB introduced by PostgreSQL
...me operation at a json typed value)
When jsonb will be available with a stable release, there will be two major use cases, when you can easily select between them:
If you only work with the JSON representation in your application, PostgreSQL is only used to store & retrieve this representati...
convert_tz returns null
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This will happen if you haven't loaded the time zone table into mysql.
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
mysql is the name of the built-in database that holds MySQL-specific configuration data.
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How do I put an already-running process under nohup?
... [-h] [jobspec ...]
Without options, each jobspec is removed from the table of active jobs. If the -h option is given, each jobspec is not
removed from the table, but is marked so that SIGHUP is not sent to the job if the shell receives a SIGHUP. If no jobspec is
present, and neither the -a...
postgresql - replace all instances of a string within text field
...on:
replace(string text, from text, to text)
for instance :
UPDATE <table> SET <field> = replace(<field>, 'cat', 'dog')
Be aware, though, that this will be a string-to-string replacement, so 'category' will become 'dogegory'. the regexp_replace function may help you define a ...
Defining a HTML template to append using JQuery
...en-template').html();
$('button.addRow').click(function() {
$('#targetTable').append(template);
});
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Parsing JSON using Json.net
...rays and Objects. These correspond here to the datatypes ArrayList and Hashtable.
/// All numbers are parsed to doubles.
/// </summary>
using System;
using System.Collections;
using System.Globalization;
using System.Text;
public class JSON
{
public const int TOKEN_NONE = ...