配置范例
'mysql' => [ 'driver' => 'mysql', 'write' => [ 'host' => '192.168.1.180', ], 'read' => [ ['host' => '192.168.1.182'], ['host' => '192.168.1.179'], ], ... ]
或
'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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