mysql_data_seek pdo等效 [英] mysql_data_seek pdo equivalent
问题描述
使用pdo对象相当于mysql_data_seek吗? 你能举个例子吗?
Which is the equivalent of mysql_data_seek using pdo objects? Can you give me an example?
谢谢！
推荐答案
通常的答案是:您的数据直接在数组PDOStatement::fetchAll中查找吗?但是如果查询获取了很多数据，这是错误的(！ ).
The usual answer is: do your data seek directly in the array PDOStatement::fetchAll... But it is WRONG IF the query fetches a lot of data (!).
有2种真实的解决方案，
There are 2 real solutions,
1)(如果数据库允许使用PDO::FETCH_ORI_ABS或PDO::FETCH_ORI_REL)，
例如，
1) if database permits use PDO::FETCH_ORI_ABS or PDO::FETCH_ORI_REL,
example,
$result = $sth->fetch(PDO::FETCH_ASSOC, PDO::FETCH_ORI_ABS, 973);
(编辑)但是，如@ChoiZ所评论，具有 PDO-MySQL限制:"MySQL不支持光标(外部已存储程序)，驱动程序无法为您模拟它们".请稍后再试，或者使用MySQL的fork，例如MariaDB.
(EDIT) But, as commented by @ChoiZ, have a PDO-MySQL limitation: "MySQL does not support cursors" (outside stored programs) "and the driver cannot emulate them for you"... Try later or with MySQL's forks, like MariaDB.
2)使用数据库解决方案(一种分页).示例:
2) use the database solution (a kind of pagination). Example:
SELECT a, b FROM table LIMIT 1, 973
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