[PHP] Larval 主从读写分离配置

在DB的连接工厂中找到以下代码
.../vendor/laravel/framework/src/Illuminate/Database/Connectors/ConnectionFactory.php

/**
 * Get the read configuration for a read / write connection.
 *
 * @param  array  $config
 * @return array
 */
protected function getReadConfig(array $config)
{
    $readConfig = $this->getReadWriteConfig($config, 'read');  

    return $this->mergeReadWriteConfig($config, $readConfig);
}  

/**
 * Get a read / write level configuration.
 *
 * @param  array   $config
 * @param  string  $type
 * @return array
 */
protected function getReadWriteConfig(array $config, $type)
{
    if (isset($config[$type][0])) {
        return $config[$type][array_rand($config[$type])];
    }  

    return $config[$type];
} 

/**
 * Merge a configuration for a read / write connection.
 *
 * @param  array  $config
 * @param  array  $merge
 * @return array
 */
protected function mergeReadWriteConfig(array $config, array $merge)
{
    return array_except(array_merge($config, $merge), ['read', 'write']);
}

工厂类通过随机获取读DB配置来进行读取操作，由此可推出DB的配置应该如下

'mysql' => [
    'write'    => [
        'host' => '192.168.1.180',
    ],
    'read'     => [
        ['host' => '192.168.1.182'],
        ['host' => '192.168.1.179'],
    ],
    'driver'    => 'mysql',
    'database'  => 'database',
    'username'  => 'root',
    'password'  => '',
    'charset'   => 'utf8',
    'collation' => 'utf8_unicode_ci',
    'prefix'    => '',
]

加强版，支持多主多从，支持独立用户名和密码，配置如下

'mysql' => [
    'write'    => [
        [
            'host' => '192.168.1.180',
            'username'  => '',
            'password'  => '',
        ],
    ],
    'read'     => [
        [
            'host' => '192.168.1.182',
            'username'  => '',
            'password'  => '',
        ],
        [
            'host' => '192.168.1.179',
            'username'  => '',
            'password'  => '',
        ],
    ],
    'driver'    => 'mysql',
    'database'  => 'database',
    'charset'   => 'utf8',
    'collation' => 'utf8_unicode_ci',
    'prefix'    => '',
]

验证
开启MySQL的general-log，通过tail -f的方式监控log变化来确定配置是否生效