Alibaba Cloud RDS queries, one master RDS, multiple read only RDS, how does the website set up the database connection?

Do you need to configure multiple connections or just configure primary RDS?

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Do you need to configure multiple connections or just configure primary RDS?

Usually write off the main RDS, read-only RDS.
In the case of PHP, the MVC framework is usually just a configuration.
such as thinkphp, you can specify the use of an RDS when reading, or a random RDS
Here is the code (read the note If you don't understand it):

    /** * Connection to distributed server * @access protected * @param boolean $master primary server * @return void */protected Fu   Nction Multiconnect ($master =false) {foreach ($this->config as $key = + $val) {$_config[$key] =        Explode (', ', $val);                }//database read and write whether to detach if (C (' db_rw_separate ')) {//master-slave with read-write separation if ($master)            The primary server writes $R = Floor (Mt_rand (0,c (' Db_master_num ')-1));                else{if (Is_numeric (C (' Db_slave_no '))) {//specify server Read $r = C (' db_slave_no '); }else{//Read operation connection from server $r = Floor (Mt_rand (C (' Db_master_num '), COUNT ($_config[' hostname '   ])-1); Each randomly connected database}}}else{//read-write operation does not differentiate between server $r = Floor (Mt_rand ($ 0,count ($   _config[' hostname ')-1); Each randomly connected database} $db _config = Array (' username ' = = isset ($_config[' username '] [$r])? $_config[' username ' [$r]:$_config[' username '][0], ' password ' = isset ($_config[' password ' [$r])? $_config[' PASSW Ord '] [$r]:$_config[' password '][0], ' hostname ' + isset ($_config[' hostname ' [$r])? $_config[' hostname ' [$r]: $_config[' hostname '][0], ' hostport ' = isset ($_config[' hostport ' [$r])? $_config[' Hostport ' [$r]:$_config[' Hostport '][0], ' database ' = isset ($_config[' database '] [$r])? $_config[' database ' [$r]:$_config[' database ']    [0], ' dsn ' = isset ($_config[' DSN '] [$r])? $_config[' DSN '] [$r]:$_config[' DSN '][0], ' params ' = Isset ($_config[' params '] [$r])? $_config[' params '] [$r]:$_config[' params '][0], ' charset ' = Isset (        $_config[' CharSet '] [$r])? $_config[' CharSet '] [$r]:$_config[' CharSet '][0],);    return $this->connect ($db _config, $r); }

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