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Laravel数据库读写分离配置的方法

2020-09-04 08:23:09 来源:易采站长站 作者:

Laravel数据库读写分离配置的方法,代码,范例,地址,授人,都在

Laravel数据库读写分离配置的方法

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配置范例

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

'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

'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

'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

'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:

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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