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我正在将 Doctrine Migrations 集成到现有项目和迁移文件中，每当我在Schema（例如$schema->getTables()）上调用方法时，都会收到此错误：

Executing dry run of migration up to 20180726185129 from 0

  ++ migrating 20180726185129

IN UP
Migration 20180726185129 failed during Execution. Error An exception occurred while executing 'SELECT quote_ident(r.conname) as conname, pg_catalog.pg_get_constraintdef(r.oid, true) as condef
                  FROM pg_catalog.pg_constraint r
                  WHERE r.conrelid =
                  (
                      SELECT c.oid
                      FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n
                      WHERE n.nspname NOT IN ('pg_catalog', 'information_schema', 'pg_toast') AND c.relname = 'config' AND n.nspname = ANY(string_to_array((select replace(replace(setting,'"$user"',user),' ','') from pg_catalog.pg_settings where name = 'search_path'),',')) AND n.oid = c.relnamespace
                  )
                  AND r.contype = 'f'':

SQLSTATE[21000]: Cardinality violation: 7 ERROR:  more than one row returned by a subquery used as an expression

In AbstractPostgreSQLDriver.php line 91:

  An exception occurred while executing 'SELECT quote_ident(r.conname) as con  
  name, pg_catalog.pg_get_constraintdef(r.oid, true) as condef                 
                    FROM pg_catalog.pg_constraint r                            
                    WHERE r.conrelid =                                         
                    (                                                          
                        SELECT c.oid                                           
                        FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n  
                        WHERE n.nspname NOT IN ('pg_catalog', 'information_sc  
  hema', 'pg_toast') AND c.relname = 'config' AND n.nspname = ANY(string_to_a  
  rray((select replace(replace(setting,'"$user"',user),' ','') from pg_catalo  
  g.pg_settings where name = 'search_path'),',')) AND n.oid = c.relnamespace   
                    )                                                          
                    AND r.contype = 'f'':                                      

  SQLSTATE[21000]: Cardinality violation: 7 ERROR:  more than one row returne  
  d by a subquery used as an expression                                        


In PDOConnection.php line 106:

  SQLSTATE[21000]: Cardinality violation: 7 ERROR:  more than one row returne  
  d by a subquery used as an expression                                        


In PDOConnection.php line 104:

  SQLSTATE[21000]: Cardinality violation: 7 ERROR:  more than one row returne  
  d by a subquery used as an expression

我认为这是因为我有config两个模式中命名的表，这就是它得到两行的原因。我不确定如何避免这个问题，并且没有选项可以在其中声明默认migrations.xml模式migrations-db.php。

我真的很想在迁移中使用 DBAL，但不幸的是，这让我别无选择，只能使用this->addSql().

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