我已按照http://docs.drush.org/en/master/install/的说明安装Drush（尝试了全局和个人选项）。
当我cd到Drupal站点root并键入＆＃34; drush status＆＃34;我得到以下内容：
Drupal version : 7.34
Site URI : http://default
PHP executable : /usr/bin/php
PHP configuration : /etc/php.ini
PHP OS : Linux
Drush script : /root/.composer/vendor/drush/drush/drush.php
Drush version : 7.0.0
Drush temp directory : /tmp
Drush configuration :
Drush alias files :
Drupal root : /var/www/site_dev
Site path : sites/default
当我输入＆＃34; drush cc all＆＃34;我明白了：
No Drupal site found, only 'drush' cache was cleared.
'all' cache was cleared.
当我输入＆＃34; drush sqlc＆＃34;我明白了：
exception 'ReflectionException' with message 'Class Drush\Sql\Sql7 does not have a constructor, so you cannot pass any constructor [error]
arguments' in /root/.composer/vendor/drush/drush/includes/drush.inc:113
Stack trace:
#0 /root/.composer/vendor/drush/drush/includes/drush.inc(113): ReflectionClass->newInstanceArgs(Array)
#1 /root/.composer/vendor/drush/drush/commands/sql/sql.drush.inc(605): drush_get_class('Drush\Sql\Sql', Array, Array)
#2 /root/.composer/vendor/drush/drush/commands/sql/sql.drush.inc(588): drush_sql_get_version()
#3 /root/.composer/vendor/drush/drush/commands/sql/sql.drush.inc(454): drush_sql_get_class()
#4 [internal function]: drush_sql_cli()
#5 /root/.composer/vendor/drush/drush/includes/command.inc(368): call_user_func_array('drush_sql_cli', Array)
#6 /root/.composer/vendor/drush/drush/includes/command.inc(219): _drush_invoke_hooks(Array, Array)
#7 [internal function]: drush_command()
#8 /root/.composer/vendor/drush/drush/includes/command.inc(187): call_user_func_array('drush_command', Array)
#9 /root/.composer/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php(62): drush_dispatch(Array)
#10 /root/.composer/vendor/drush/drush/drush.php(70): Drush\Boot\BaseBoot->bootstrap_and_dispatch()
#11 /root/.composer/vendor/drush/drush/drush.php(11): drush_main()
#12 {main}
这让我觉得这个问题与MySQL有关（因为状态并没有列出数据库参数），但我无法弄明白。在网站下只有默认文件夹，因此它不是多站点安装。
有人可以告诉我们有什么不对吗？
更新 我已将PHP升级到5.5.27并重新安装了Drush 7.0.0。 根据建议here我从主文件夹中删除了my.cnf，之后＆＃34; drush sqlc＆＃34;开始工作，但是当我键入＆＃34; drush -v -d status＆＃34;它给了我：
Starting Drush preflight. [0.01 sec, 2.08 MB] [preflight]
Cache HIT cid: 7.0.0-commandfiles-0-81cc86c1995ab7206f383ec28ad43baf [0.01 sec, 2.14 MB] [debug]
Bootstrap to phase 0. [0.07 sec, 6.08 MB] [bootstrap]
Drush bootstrap phase : bootstrap_drupal_root() [0.08 sec, 6.43 MB] [bootstrap]
Initialized Drupal 7.34 root directory at /var/www/site_dev [0.08 sec, 6.43 MB] [notice]
Find command files for phase 1 (max=7) [0.08 sec, 4.48 MB] [debug]
Cache HIT cid: 7.0.0-commandfiles-1-a0882f4af91e1d6b72794cc62bb1b558 [0.08 sec, 4.49 MB] [debug]
Drush bootstrap phase : bootstrap_drupal_site() [0.08 sec, 4.49 MB] [bootstrap]
Initialized Drupal site default at sites/default [0.08 sec, 4.5 MB] [notice]
Find command files for phase 2 (max=7) [0.09 sec, 4.5 MB] [debug]
Cache HIT cid: 7.0.0-commandfiles-2-f17fc6bdab2f74278df75194ca483893 [0.09 sec, 4.5 MB] [debug]
Drush bootstrap phase : bootstrap_drupal_configuration() [0.09 sec, 4.5 MB] [bootstrap]
Find command files for phase 3 (max=7) [0.09 sec, 4.51 MB] [debug]
sql-query: SELECT 1; [0.09 sec, 4.62 MB] [status]
Executing: mysql --defaults-extra-file=/tmp/drush_CKiVHd --database=site_dev --host=localhost --silent < /tmp/drush_DG1fIs
1
Drush bootstrap phase : bootstrap_drupal_database() [0.1 sec, 4.62 MB] [bootstrap]
Successfully connected to the Drupal database. [0.11 sec, 5.13 MB] [bootstrap]
Find command files for phase 4 (max=7) [0.11 sec, 5.13 MB] [debug]
Drush bootstrap phase : bootstrap_drupal_full() [0.11 sec, 5.13 MB] [bootstrap]
Cannot modify header information - headers already sent by (output started at /root/.composer/vendor/drush/drush/includes/output.inc:38)[warning]
common.inc:698 [0.96 sec, 31.9 МБ]
Drush command terminated abnormally due to an unrecoverable error.
答案 0 :(得分：3)
听起来可能是这个问题：7.x does not work with PHP 5.3.3。
提供了in this comment的解决方案：
基类
SqlVersion类没有构造函数而且还有 空数组传递给它的后代（Sql6或Sql7）。要解决此问题，请执行以下行：
return $reflectionClass->newInstanceArgs($constructor_args);应替换为：
return !empty($constructor_args) ? $reflectionClass->newInstanceArgs($constructor_args) : $reflectionClass->newInstanceArgs();
或者，您可以升级PHP v5.4或更高版本。
或者，您可以将Drush降级为6.x。
答案 1 :(得分：0)
如果您在本地（开发）环境中运行此网站（很难从问题中得知......）
然后尝试将Drupal的settings.php文件中的数据库主机从“localhost”更改为“127.0.0.1”。
答案 2 :(得分：0)
如果您正在使用Windows，则需要验证是否正确设置了MYSQL的PATH变量。我升级了WAMP时遇到了问题。
这样的示例：C:\wamp\bin\mysql\mysql5.6.17\bin