I can't use mysql .How should i config the file of php.ini . the message:
Fatal error: Call to undefined function mysql_errno() in /var/www/html/inc/dv_clssql.php on line 129
how should i do? please help me (2 Replies)
This problem has been killing me all day, and I cannot solve it.
Basically, I am using node.js with the mysql module and it will not connect to the database.
Here is the JS code snippet in node.js:
app.get("/test", function(req, res) {
var mysql = require("mysql");
var con =... (4 Replies)
In my further exploration of Arduino, today I decided to install the arduino-cli on my mac today.
https://github.com/arduino/arduino-cli
I followed the instructions for macOS but when I got to this part:
arduino-cli board list
I got the dreaded "Unknown" Fully Qualified Board Name... (1 Reply)
Here is a useful SSL (HTTPS) application for anyone with a remote Linux server they want to keep an eye on using Blynk and the NodeMCU ESP8266. This little app also works (have tested as well) on the WeMos D1 ESP8266 Arduino board.
The NodeMCU setup could not be easier, just find a... (8 Replies)
Here we go....
Preface:
..... so in a galaxy far, far, far away from commercial, data sharing corporations.....
For this project, I used the ESP-WROOM-32 as an MQTT (publish / subscribe) client which receives Linux server "load averages" as messages published as MQTT pub/sub messages.... (6 Replies)
After setting up MQTT and testing some ESP8266 and ESP32 modules, where I noted that testing in Programming ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages, I was so impressed with MQTT that I installed MQTT on three different computers, instantly and... (2 Replies)
Various Node-Red crypto modules do not work with PHP, so to send an encrypted message from a PHP script (in this case from a Ubuntu server) to Node-RED we need our own code.
After a few hours of searching, testing various libs, more testing and debugging, I got this PHP to Node-RED code... (0 Replies)
First, I want to thank Neo (LOL) for this post from 2018, Node.js and mysql - ER_ACCESS_DENIED_ERROR
I could not get the Node-RED mysql module to work and searched Google until all my links were purple! I kept getting ER_ACCESS_DENIED_ERROR with the right credentials. Nothing on the web was... (0 Replies)
Discussion started by: Neo
0 Replies
LEARN ABOUT DEBIAN
tree::node
Node(3pm) User Contributed Perl Documentation Node(3pm)NAME
Tree::RedBlack::Node - Node class for Perl implementation of Red/Black tree
SYNOPSIS
use Tree::RedBlack; my $t = new Tree::RedBlack; $t->insert(3, 'dog'); my $node = $t->node(3); $animal = $node->val;
DESCRIPTION
A Tree::RedBlack::Node object supports the following methods:
key ()
Key of the node. This is what the nodes are sorted by in the tree.
val ($)
Value of the node. Can be any perl scalar, so it could be a hash-ref, f'rinstance. This can be set directly.
color ()
Color of the node. 1 for "red", 0 or undef for "black".
parent ()
Parent node of this one. Returns undef for root node.
left ()
Left child node of this one. Returns undef for leaf nodes.
right ()
Right child node of this one. Returns undef for leaf nodes.
min ()
Returns the node with the minimal key starting from this node.
max ()
Returns the node with the maximal key starting from this node.
successor ()
Returns the node with the smallest key larger than this node's key, or this node if it is the node with the maximal key.
predecessor ()
Similar to successor. WARNING: NOT YET IMPLEMENTED!!
You can use these methods to write utility routines for actions on red/black trees. For instance, here's a routine which writes a tree out
to disk, putting the byte offsets of the left and right child records in the record for each node.
sub dump {
my($node, $fh) = @_;
my($left, $right);
my $pos = tell $fh;
print $fh $node->color ? 'R' : 'B';
seek($fh, 8, 1);
print $fh $node->val;
if ($node->left) {
$left = dump($node->left,$fh);
}
if ($node->right) {
$right = dump($node->right,$fh);
}
my $end = tell $fh;
seek($fh, $pos+1, 0);
print $fh pack('NN', $left, $right);
seek($fh, $end, 0);
$pos;
}
You would call it like this:
my $t = new Tree::RedBlack;
...
open(FILE, ">tree.dump");
dump($t->root,*FILE);
close FILE;
As another example, here's a simple routine to print a human-readable dump of the tree:
sub pretty_print {
my($node, $fh, $lvl) = @_;
if ($node->right) {
pretty_print($node->right, $fh, $lvl+1);
}
print $fh ' 'x($lvl*3),'[', $node->color ? 'R' : 'B', ']', $node->key, "
";
if ($node->left) {
pretty_print($this->left, $fh, $lvl+1);
}
}
A cleaner way of doing this kind of thing is probably to allow sub-classing of Tree::RedBlack::Node, and then allow the Tree::RedBlack
constructor to take an argument saying what class of node it should be made up out of. Hmmm...
AUTHOR
Benjamin Holzman <bholzman@earthlink.net>
SEE ALSO
Tree::RedBlack
perl v5.10.0 2008-07-31 Node(3pm)