在 PHP 7.0.22、CakePHP 2.10.3 下，报错：Error: The datasource configuration tmp was not found in database.php.的解决(动态设置数据源对象)

1、在 PHP 7.0.22、CakePHP 2.10.3 下，报错：Error: The datasource configuration tmp was not found in database.php.，如图1

图1

2、打印 $this->useDbConfig，其值为 tmp，如图2

图2

3、确定在 database.php 中不存在 $tmp，如图3

图3

4、但是之前在 CakePHP 2.6.4 确定是正常的，决定对比一下区别，发现区别所在(注：修改了核心库，升级之后，核心库的 _init() 被还原)，如图4

图4

\lib\Cake\Model\ConnectionManager.php

<?php
	protected static function _init() {
//		@include_once APP . 'Config' . DS . 'database.php';
//		if (class_exists('DATABASE_CONFIG')) {
//			self::$config = new DATABASE_CONFIG();
//		}
		self::$_init = true;
	}
?>

注：修改了核心库，升级之后，核心库的 _init() 被还原

<?php
	protected static function _init() {
		include_once CONFIG . 'database.php';
		if (class_exists('DATABASE_CONFIG')) {
			static::$config = new DATABASE_CONFIG();
		}
		static::$_init = true;
	}

?>

5、在 \lib\Cake\Model\ConnectionManager.php的getDataSource方法打印static::$config，如图5

图5

6、打印结果，确定不存在 $tmp，如图6

图6

7、现在的需求应该为，在不修改核心库的前提下，确保 static::$config 中存在 $tmp，查看之前的实现，如图7

图7

\app\Model\AppModel.php

<?php

    public function getDbConfig($tenantid){
         if(!$conn = Cache::read($tenantid,'_cake_config_')){
            $tenant = new Tenant();
            $conn = $tenant->getTenantEnv($tenantid);
            $this->log($conn);
            Cache::write($tenantid,$conn,'_cake_config_');
        }
        return $conn;
    }

	public function setDataSource($dataSource = null) {
        if($_GET['tenantid']){
            $tenantid = [addslashes($_GET['tenantid'])];
        }else{
            preg_match('@^(?:http://)?([^/]+)@i', FULL_BASE_URL, $matches);
            $tenantid = explode('.', $matches[1]);
        }
        $conn = $this->getDbConfig($tenantid[0]);
        if(!$conn) die('系统错误506，无法链接数据库');

		$this->useDbConfig = $dataSource = 'tmp';
		$oldConfig = $this->useDbConfig;

		if ($dataSource) {
			$this->useDbConfig = $dataSource;
		}

		$config = new stdClass();
        $config->tmp = array(
           'datasource' => 'Database/Mysql',
           'persistent' => false,
           'host' =>$conn['db_info']['host'],
           'login' => $conn['db_info']['login'],
           'password' => $conn['db_info']['password'],
           'database' => $conn['db_info']['database'],
           'port' => 3306,
           'prefix' => 'operation_',
           'encoding' => 'utf8'
       );
//		if(!$conn){
//		 pr($config->tmp);
//         $config->tmp = array(
//             'datasource' => 'Database/Mysql',
//             'persistent' => false,
//             'host' => '127.0.0.1',
//             'login' =>'root',
//             'password' =>'root',
//             'database' =>"jifen",
//             'port' => 3306,
//             'prefix' => 'operation_',
//             'encoding' => 'utf8'
//         );
//		}
//        $this->log($config->tmp);
        ConnectionManager::$config = $config;
		$db = ConnectionManager::getDataSource($this->useDbConfig);
		if (!empty($oldConfig) && isset($db->config['prefix'])) {
			$oldDb = ConnectionManager::getDataSource($oldConfig);

			if (!isset($this->tablePrefix) || (!isset($oldDb->config['prefix']) || $this->tablePrefix === $oldDb->config['prefix'])) {
				$this->tablePrefix = $db->config['prefix'];
			}
		} elseif (isset($db->config['prefix'])) {
			$this->tablePrefix = $db->config['prefix'];
		}
		$schema = $db->getSchemaName();
		$defaultProperties = get_class_vars(get_class($this));
		if (isset($defaultProperties['schemaName'])) {
			$schema = $defaultProperties['schemaName'];
		}
		$this->schemaName = $schema;
     //pr($config->tmp);  
	}
?>

8、在运行时以给定的名称和设置动态创建一个DataSource对象，便无需修改核心库，如图8

图8

\app\Model\AppModel.php

<?php
    public function getDbConfig($tenantid){
         if(!$conn = Cache::read($tenantid,'_cake_config_')){
            $tenant = new Tenant();
            $conn = $tenant->getTenantEnv($tenantid);
            $this->log($conn);
            Cache::write($tenantid,$conn,'_cake_config_');
        }
        return $conn;
    }

	public function setDataSource($dataSource = null) {
        if($_GET['tenantid']){
            $tenantid = [addslashes($_GET['tenantid'])];
        }else{
            preg_match('@^(?:http://)?([^/]+)@i', FULL_BASE_URL, $matches);
            $tenantid = explode('.', $matches[1]);
        }
        $conn = $this->getDbConfig($tenantid[0]);
        if(!$conn) die('系统错误506，无法链接数据库');

        $dataSource = 'tmp';

        $config = array(
            'datasource' => 'Database/Mysql',
            'persistent' => false,
            'host' =>$conn['db_info']['host'],
            'login' => $conn['db_info']['login'],
            'password' => $conn['db_info']['password'],
            'database' => $conn['db_info']['database'],
            'port' => 3306,
            'prefix' => 'operation_',
            'encoding' => 'utf8'
        );
        ConnectionManager::create($dataSource, $config);

		$this->useDbConfig = $dataSource;
		$oldConfig = $this->useDbConfig;

		if ($dataSource) {
			$this->useDbConfig = $dataSource;
		}

		$db = ConnectionManager::getDataSource($this->useDbConfig);
		if (!empty($oldConfig) && isset($db->config['prefix'])) {
			$oldDb = ConnectionManager::getDataSource($oldConfig);

			if (!isset($this->tablePrefix) || (!isset($oldDb->config['prefix']) || $this->tablePrefix === $oldDb->config['prefix'])) {
				$this->tablePrefix = $db->config['prefix'];
			}
		} elseif (isset($db->config['prefix'])) {
			$this->tablePrefix = $db->config['prefix'];
		}
		$schema = $db->getSchemaName();
		$defaultProperties = get_class_vars(get_class($this));
		if (isset($defaultProperties['schemaName'])) {
			$schema = $defaultProperties['schemaName'];
		}
		$this->schemaName = $schema;
	}
?>

9、在 \lib\Cake\Model\ConnectionManager.php的getDataSource方法打印static::$config，$tmp已经存在，如图9

图9

10、再次运行，正常，如图10

图10

11、总结：为何需要在 \app\Model\AppModel.php 覆盖 setDataSource()，原因在于数据库是动态从接口获取的，并非源于 \app\Config\database.php，通过 ConnectionManager::create，便可以实现动态创建一个数据源对象。