mysqli::$affected_rows

mysqli_affected_rows

(PHP 5, PHP 7, PHP 8)

mysqli::$affected_rows -- mysqli_affected_rowsGets the number of affected rows in a previous MySQL operation

说明

面向对象风格

过程化风格

mysqli_affected_rows(mysqli $mysql): int|string

Returns the number of rows affected by the last INSERT, UPDATE, REPLACE or DELETE query. Works like mysqli_num_rows() for SELECT statements.

参数

mysql

仅以过程化样式:由mysqli_connect()mysqli_init() 返回的 mysqli 对象。

返回值

An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records were updated for an UPDATE statement, no rows matched the WHERE clause in the query or that no query has yet been executed. -1 indicates that the query returned an error or that mysqli_affected_rows() was called for an unbuffered SELECT query.

注意:

If the number of affected rows is greater than the maximum int value (PHP_INT_MAX), the number of affected rows will be returned as a string.

范例

示例 #1 $mysqli->affected_rows example

面向对象风格

<?php

mysqli_report
(MYSQLI_REPORT_ERROR MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost""my_user""my_password""world");

/* Insert rows */
$mysqli->query("CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %d\n"$mysqli->affected_rows);

$mysqli->query("ALTER TABLE Language ADD Status int default 0");

/* update rows */
$mysqli->query("UPDATE Language SET Status=1 WHERE Percentage > 50");
printf("Affected rows (UPDATE): %d\n"$mysqli->affected_rows);

/* delete rows */
$mysqli->query("DELETE FROM Language WHERE Percentage < 50");
printf("Affected rows (DELETE): %d\n"$mysqli->affected_rows);

/* select all rows */
$result $mysqli->query("SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %d\n"$mysqli->affected_rows);

/* Delete table Language */
$mysqli->query("DROP TABLE Language");

过程化风格

<?php

mysqli_report
(MYSQLI_REPORT_ERROR MYSQLI_REPORT_STRICT);
$link mysqli_connect("localhost""my_user""my_password""world");

/* Insert rows */
mysqli_query($link"CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %d\n"mysqli_affected_rows($link));

mysqli_query($link"ALTER TABLE Language ADD Status int default 0");

/* update rows */
mysqli_query($link"UPDATE Language SET Status=1 WHERE Percentage > 50");
printf("Affected rows (UPDATE): %d\n"mysqli_affected_rows($link));

/* delete rows */
mysqli_query($link"DELETE FROM Language WHERE Percentage < 50");
printf("Affected rows (DELETE): %d\n"mysqli_affected_rows($link));

/* select all rows */
$result mysqli_query($link"SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %d\n"mysqli_affected_rows($link));

/* Delete table Language */
mysqli_query($link"DROP TABLE Language");

以上例程会输出:

Affected rows (INSERT): 984
Affected rows (UPDATE): 168
Affected rows (DELETE): 815
Affected rows (SELECT): 169

参见