Hướng dẫn dùng sqlrowcount trong PHP

[PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0]

PDOStatement::rowCount — Returns the number of rows affected by the last SQL statement

Description

public PDOStatement::rowCount[]: int

If the last SQL statement executed by the associated PDOStatement was a SELECT statement, some databases may return the number of rows returned by that statement. However, this behaviour is not guaranteed for all databases and should not be relied on for portable applications.

Note:

This method returns "0" [zero] with the SQLite driver at all times, and with the PostgreSQL driver only when setting the PDO::ATTR_CURSOR statement attribute to PDO::CURSOR_SCROLL.

Parameters

This function has no parameters.

Return Values

Returns the number of rows.

Examples

Example #1 Return the number of deleted rows

PDOStatement::rowCount[] returns the number of rows affected by a DELETE, INSERT, or UPDATE statement.

The above example will output something similar to:

Return number of rows that were deleted:
Deleted 9 rows.

Example #2 Counting rows returned by a SELECT statement

For most databases, PDOStatement::rowCount[] does not return the number of rows affected by a SELECT statement. Instead, use PDO::query[] to issue a SELECT COUNT[*] statement with the same predicates as your intended SELECT statement, then use PDOStatement::fetchColumn[] to retrieve the number of matching rows.