php 您可以通过在表中指定数据库名称来 DROP TABLE IF EXISTS 吗?
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Can you DROP TABLE IF EXISTS by specifying database name with table?
提问by H. Ferrence
I am trying to drop a table in a database with the following query statement:
我正在尝试使用以下查询语句在数据库中删除一个表:
mysql_query('DROP TABLE IF EXISTS "dbName.tableName"') or die(mysql_error());
But I keep getting an error. Does anyone know if specifying the dbName.tableName is invalid?
但我不断收到错误消息。有谁知道指定 dbName.tableName 是否无效?
回答by Emmerman
mysql_query('DROP TABLE IF EXISTS `dbName`.`tableName`') or die(mysql_error());
回答by Kris
You should use backticks instead of double quotes like this:
您应该使用反引号而不是像这样的双引号:
mysql_query('DROP TABLE IF EXISTS `dbName`.`tableName`');
回答by John Cartwright
You can't use double quotes to quote db/table names, instead you either leave them unquoted or use backticks. But to answer your question, yes it is perfectly valid to specify the database name.
您不能使用双引号来引用 db/table 名称,而是将它们不加引号或使用反引号。但是要回答您的问题,是的,指定数据库名称是完全有效的。
DROP TABLE `dbName`.`tableName`