[php]mysql数据库操作DB类_MySQL
/*
* mysql数据库 DB类
* @package db
* @author yytcpt(无影)
* @version 2008-03-27
* @copyrigth http://www.d5s.cn/
*/
class db {
var $connection_id = "";
var $pconnect = 0;
var $shutdown_queries = array();
var $queries = array();
var $query_id = "";
var $query_count = 0;
var $record_row = array();
var $failed = 0;
var $halt = "";
var $query_log = array();
function connect($db_config){
if ($this->pconnect){
$this->connection_id = mysql_pconnect($db_config["hostname"], $db_config["username"], $db_config["password"]);
}else{
$this->connection_id = mysql_connect($db_config["hostname"], $db_config["username"], $db_config["password"]);
}
if ( ! $this->connection_id ){
$this->halt("Can not connect MySQL Server");
}
if ( ! @mysql_select_db($db_config["database"], $this->connection_id) ){
$this->halt("Can not connect MySQL Database");
}
if ($db_config["charset"]) {
@mysql_unbuffered_query("SET NAMES '".$db_config["charset"]."'");
}
return true;
}
//发送SQL 查询,并返回结果集
function query($query_id, $query_type='mysql_query'){
$this->query_id = $query_type($query_id, $this->connection_id);
$this->queries[] = $query_id;
if (! $this->query_id ) {
$this->halt("查询失败:/n$query_id");
}
$this->query_count++;
$this->query_log[] = $str;
return $this->query_id;
}
//发送SQL 查询,并不获取和缓存结果的行
function query_unbuffered($sql=""){
return $this->query($sql, 'mysql_unbuffered_query');
}
//从结果集中取得一行作为关联数组
function fetch_array($sql = ""){
if ($sql == "") $sql = $this->query_id;
$this->record_row = @mysql_fetch_array($sql, MYSQL_ASSOC);
return $this->record_row;
}
function shutdown_query($query_id = ""){
$this->shutdown_queries[] = $query_id;
}
//取得结果集中行的数目,仅对 INSERT,UPDATE 或者 DELETE
function affected_rows() {
return @mysql_affected_rows($this->connection_id);
}
//取得结果集中行的数目,仅对 SELECT 语句有效
function num_rows($query_id="") {
if ($query_id == "") $query_id = $this->query_id;
return @mysql_num_rows($query_id);
}
//返回上一个 MySQL 操作中的错误信息的数字编码
function get_errno(){
$this->errno = @mysql_errno($this->connection_id);
return $this->errno;
}
//取得上一步 INSERT 操作产生的 ID
function insert_id(){
return @mysql_insert_id($this->connection_id);
}
//得到查询次数
function query_count() {
return $this->query_count;
}
//释放结果内存
function free_result($query_id=""){
if ($query_id == "") $query_id = $this->query_id;
@mysql_free_result($query_id);
}
//关闭 MySQL 连接
function close_db(){
if ( $this->connection_id ) return @mysql_close( $this->connection_id );
}
//列出 MySQL 数据库中的表
function get_table_names(){
global $db_config;
$result = mysql_list_tables($db_config["database"]);
$num_tables = @mysql_numrows($result);
for ($i = 0; $i $tables[] = mysql_tablename($result, $i);
}
mysql_free_result($result);
return $tables;
}
//从结果集中取得列信息并作为对象返回,取得所有字段
function get_result_fields($query_id=""){
if ($query_id == "") $query_id = $this->query_id;
while ($field = mysql_fetch_field($query_id)) {
$fields[] = $field;
}
return $fields;
}
//错误提示
function halt($the_error=""){
$message = $the_error."
/r/n";
$message.= $this->get_errno() . "
/r/n";
$sql = "INSERT INTO `db_error`(pagename, errstr, timer) VALUES('".
- 首页
- 互联网软件
- IDC产品
- 站长交易
- 项目外包
- 商业信息
- 招聘
- 公司库
- 站长商城
- 资 讯
- 下 载
- 学 院
- 工 具
- 论 坛
热门关键字:CSS布局配色参考Dreamweaver8 apacheApacheIIS6AjaxWML
视频教程 | 常用手册 | 常用广告代码 | js特效代码 |
站长学院 >> 网站开发技术教程 >> mysql教程 >> [php]mysql数据库操作——DB类
[php]mysql数据库操作——DB类
2008-4-13 6:12:00查看学习心得
{GetProperty(Content)}

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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.
