成功的MySQL DELETE返回什么?如何检查DELETE是否成功? [英] What does a successful MySQL DELETE return? How to check if DELETE was successful?

问题描述

使用PHP，我试图删除一条记录，但是我想检查它是否成功.成功的DELETE FROM foo where bar = 'stuff'是否返回任何内容?

Using PHP, I am trying to delete a record, but I want to check if it was successful or not. Is anything returned from a successful DELETE FROM foo where bar = 'stuff'?

或者，您是否知道其他任何方法来检查DELETE是否成功?还是我最好在删除行之前先确保该行存在?我正在尝试避免再次查询.

Alternatively, do you know any other ways to check if a DELETE was successful? Or am I better off just making sure the row exists before I delete it? I am trying to avoid another query if possible.

推荐答案

假设您正在使用 mysql_query :

对于其他类型的SQL语句，例如INSERT，UPDATE，删除，DROP等，mysql_query()成功返回TRUE，错误返回FALSE.

For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc, mysql_query() returns TRUE on success or FALSE on error.

如果您使用的是 PDO :: exec ，则该手册这样说:

If you are using PDO::exec, then the manual says this:

PDO :: exec()返回由您发出的SQL语句修改或删除的行数.如果没有受影响的行，则PDO :: exec()返回0.

PDO::exec() returns the number of rows that were modified or deleted by the SQL statement you issued. If no rows were affected, PDO::exec() returns 0.

不想回答阻击，但是由于选择了它作为答案，因此我应该注意，即使查询实际上并未删除任何内容，mysql_query也会返回TRUE.您应该使用 mysql_affected_rows 进行检查.

Don't want to answer snipe, but since this was selected as the answer, I should note that mysql_query will return TRUE even if the query did not actually remove anything. You should use mysql_affected_rows to check for that.

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