Using PHP to implement Mysql read and write separation

Using PHP to implement Mysql read and write separation_PHP tutorial

WBOY

Release： 2016-07-21 15:02:12

Original

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This code is modified from uchome’s code and is processed to improve the efficiency of uchome. I have actually had this idea for a long time, but I have never done it. I believe there are people who have the same idea. If there are similar ideas, I really hope to provide relevant suggestions.

The encapsulation method is relatively simple, adding an interface extension for read-only database connection. Not using a read-only database does not affect the use of the original code. It remains to be continuously improved in the future. .
For convenience, try setting up a Google project:
http://code.google.com/p/mysql-rw-php/
I hope it will help friends in need.

Mysql read-write separation implemented by PHP
Main features:
1. Simple read-write separation
2. One main database, you can add more Read the database
3. Separate reading and writing but don’t worry that some features are not supported
4. Disadvantage: Connect two databases at the same time
English is poor, please write a few words
php code for mysql read/write split
feature:
simply rw split
one master,can add more slaves
support all mysql feature
link to the master and slave at the same time
PHP code:
mysql_rw_php.class.php

Copy code The code is as follows:

/****************************************
*** mysql-rw-php version 0.1 
*** code by hqlulu#gmail.com
*** http://www.aslibra.com
*** http://code.google.com/p/mysql-rw-php/
*** code modify from class_mysql.php (uchome)
****************************************/
class mysql_rw_php {
 //Number of queries
 var $querynum = 0;
 //Current Operational database connection
 var $link = null;
 //Character set
 var $charset;
 //Current database
 var $cur_db = '';
 //Whether There is a valid read-only database connection
 var $ro_exist = false;
 //Read-only database connection
 var $link_ro = null;
 //Read-write database connection
 var $link_rw = null;
 function mysql_rw_php(){
 }
 function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $halt = TRUE) {
 if ($pconnect) {
 if(!$this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)) {
 $halt && $this->halt('Can not connect to MySQL server');
 }
 } else {
 if(!$this->link = @mysql_connect($dbhost, $dbuser, $dbpw)) {
 $halt && $this ->halt('Can not connect to MySQL server');
 }
 }

 //Read-only connection failed
 if(!$this->link && !$ halt) return false;

 //When rw is not initialized, the first connection is rw
 if($this->link_rw == null)
 $this->link_rw = $ this->link;
 if($this->version() > '4.1') {
 if($this->charset) {
 @mysql_query("SET character_set_connection=$ '5.0. 1') {
         @mysql_query("SET sql_mode=''", $this->link);
                                                                                                                          ;select_db($dbname);
 }
 }
 //Connect a read-only mysql database
 function connect_ro($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0){
 if($this->link_rw == null)
 $this->link_rw = $this->link;
 $this->link = null;
 //No halt error is generated
 $this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect, false);
 if($this->link){
 //Connection successful
 //echo "link ro sussess!
";
 ;
 if($this->cur_db){
 //If you have already selected a database, you need to operate it once
 @mysql_select_db($this->cur_db, $this->link_ro);
 }
 }else{
                                                                                                                                                                                                         ;
 }
 }
 //Set up a series of read-only databases and connect to one of them
 function set_ro_list($ro_list){
 if(is_array($ro_list)){
 / /Randomly select one of them
 $link_ro = $ro_list[array_rand($ro_list)];
 $this->connect_ro($link_ro['dbhost'], $link_ro['dbuser'], $link_ro[ 'dbpw']);
 }
 }
 function select_db($dbname) {
 //Operate two database connections at the same time
 $this->cur_db = $dbname;
 if($this->ro_exist){
 @mysql_select_db($dbname, $this->link_ro);
 }
 return @mysql_select_db($dbname, $this->link_rw); 
 }
 function fetch_array($query, $result_type = MYSQL_ASSOC) {
 return mysql_fetch_array($query, $result_type);
 }
  function fetch_one_array($sql, $type = '') {
    $qr = $this->query($sql, $type);
    return $this->fetch_array($qr);
  }
  function query($sql, $type = '') {
    $this->link = &$this->link_rw;
    //判断是否select语句
    if($this->ro_exist && preg_match ("/^(s*)select/i", $sql)){
      $this->link = &$this->link_ro;
    }
    $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++;
    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 = '') {
    $dberror = $this->error();
    $dberrno = $this->errno();
    echo "
        MySQL Error

        Message: $message

        SQL: $sql

        Error: $dberror

        Errno.: $dberrno

        
";
    exit();
  }
}
?>