laravel 数据库迁移（Laravel数据库读写分离配置的方法）

laravel 数据库迁移

Laravel数据库读写分离配置的方法

配置范例

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'mysql' => [  'driver' => 'mysql',  'write' => [  'host' => '192.168.1.180',  ],  'read' => [  ['host' => '192.168.1.182'],  ['host' => '192.168.1.179'],  ],  ... ]

或

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'mysql' => [  'driver' => 'mysql',  'write' => [  'host' => '192.168.1.180',  ],  'read' => [  'host' => ［  '192.168.1.182',  '192.168.1.179'  ],  ],  ... ]

扩展配置范例

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'mysql' => [  'driver' => 'mysql',  'write' => [  'host' => '192.168.1.180',  'username' => 'write',  'password' => 'write',  ],  'read' => [  [  'host' => '192.168.1.182',  'username' => 'read1',  'password' => 'read1',  ],  [  'host' => '192.168.1.179',  'username' => 'read2',  'password' => 'read2',  ],  ],  ... ]

或者

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'mysql' => [  'driver' => 'mysql',  'write' => [  'host' => '192.168.1.180',  'username' => 'write',  'password' => 'write',  ],  'read' => [  'host' => ［  '192.168.1.179',  '192.168.1.182',  ],  'username' => 'read',  'password' => 'read',  ],  ... ]

公司数据库架构为一主多从，从库访问地址为唯一地址，该处方便负载均衡及扩展从库。所以最终线上采用的配置

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'mysql' => [  'driver' => 'mysql',  'write' => [  'host' => '192.168.1.180',  'username' => 'write',  'password' => 'write',  ],  'read' => [  'host' => '192.168.1.179'  'username' => 'read',  'password' => 'read',  ],  ... ]

代码分析

授人以鱼不如授人以渔，之所以配置如此灵活的原因，以及如何查找到这些配置方式。主要通过查找代码，分析代码；相关代码都在下面粘出，这里就不做解释了，代码能说明一切；

路径：vendor/laravel/framework/src/Illuminate/Database/Connectors/ConnectionFactory.php

代码：

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class ConnectionFactory {  ...    /**  * Get the read configuration for a read / write connection.  *  * @param array $config  * @return array  */  protected function getReadConfig(array $config)  {  $readConfig = $this->getReadWriteConfig($config, 'read');    if (isset($readConfig['host']) && is_array($readConfig['host'])) {  $readConfig['host'] = count($readConfig['host']) > 1  ? $readConfig['host'][array_rand($readConfig['host'])]  : $readConfig['host'][0];  }    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 $merge)  {  return Arr::except(array_merge($config, $merge), ['read', 'write']);  }    ... }     class Arr {  ...    /**  * Get all of the given array except for a specified array of items.  *  * @param array $array  * @param array|string $keys  * @return array  */  public static function except($array, $keys)  {  static::forget($array, $keys);    return $array;  }    ...    /**  * Remove one or many array items from a given array using "dot" notation.  *  * @param array $array  * @param array|string $keys  * @return void  */  public static function forget(&$array, $keys)  {  $original = &$array;    $keys = (array) $keys;    if (count($keys) === 0) {  return;  }    foreach ($keys as $key) {  $parts = explode('.', $key);    while (count($parts) > 1) {  $part = array_shift($parts);    if (isset($array[$part]) && is_array($array[$part])) {   $array = &$array[$part];  } else {   $parts = [];  }  }    unset($array[array_shift($parts)]);    // clean up after each pass  $array = &$original;  }  }    ... }

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原文链接：http://blog.onlywan.cc/14847498744910.html