An example mysql php connection class_PHP tutorial
An example mysql php connection class The following mysql database connection article was made by me from a cms and it is very complete. Just call it directly.
An example mysql tutorial php tutorial connection class
The following mysql database tutorial connection article was made by me from a cms and it is very complete. Just call it directly.
*/
class dbmysq {
var $querynum = 0;
var $link;
var $histories;
var $time;
var $tablepre;function connect($dbhost, $dbuser, $dbpw, $dbname = '', $dbcharset, $pconnect = 0, $tablepre='', $time = 0) {
$this->time = $time;
$this->tablepre = $tablepre;
if ($pconnect) {
If (!$this->link = mysql_pconnect($dbhost, $dbuser, $dbpw)) {
$this->halt('can not connect to mysql server');
}
} else {
if (!$this->link = mysql_connect($dbhost, $dbuser, $dbpw, 1)) {
$this->halt('can not connect to mysql server');
}
}if ($this->version() > '4.1') {
if ($dbcharset) {
Mysql_query("set character_set_connection=" . $dbcharset . ", character_set_results=" . $dbcharset . ", character_set_client=binary", $this->link);
}if ($this->version() > '5.0.1') {
Mysql_query("set sql_mode=''", $this->link);
}
}if ($dbname) {
Mysql_select_db($dbname, $this->link);
}
}function fetch_array($query, $result_type = mysql_assoc) {
Return mysql_fetch_array($query, $result_type);
}function result_first($sql, &$data) {
$query = $this->query($sql);
$data = $this->result($query, 0);
}function fetch_first($sql, &$arr) {
$query = $this->query($sql);
$arr = $this->fetch_array($query);
}function fetch_all($sql, &$arr) {
$query = $this->query($sql);
while ($data = $this->fetch_array($query)) {
$arr[] = $data;
}
}function cache_gc() {
$this->query("delete from {$this->tablepre}sqlcaches where expirytime");
}function query($sql, $type = '', $cachetime = false) {
$func = $type == 'unbuffered' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query';
if (!($query = $func($sql, $this->link)) && $type != 'silent') {
$this->halt('mysql query error', $sql);
}
$this->querynum++;
$this->histories[] = $sql;
return $query;
}function affected_rows() {
Return mysql_affected_rows($this->link);
}function error() {
return (($this->link) ? mysql_error($this->link) : mysql_error());
}function errno() {
return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());
}function result($query, $row) {
$query = @mysql_result($query, $row);
return $query;
}function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}function num_fields($query) {
Return mysql_num_fields($query);
}function free_result($query) {
Return mysql_free_result($query);
}function insert_id() {
return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("select last_insert_id()"), 0);
}function fetch_row($query) {
$query = mysql_fetch_row($query);
return $query;
}function fetch_fields($query) {
Return mysql_fetch_field($query);
}function version() {
Return mysql_get_server_info($this->link);
}function close() {
Return mysql_close($this->link);
}function halt($message='', $sql='') {
exit('
Prompt: Database error
sql statement: ' . $sql . '
Error keyword: ' . mysql_error());
}}
?>

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment