这篇文章主要介绍了PHP中mysqli_affected_rows作用行数返回值,实例分析了普通模式与oop模式的用法,具有一定的参考借鉴价值,需要的朋友可以参考下

本文实例分析了PHP中mysqli_affected_rows作用行数返回值。分享给大家供大家参考。具体分析如下：

mysqli中关于update操作影响的行数可以有两种返回形式:

1. 返回匹配的行数

2. 返回影响的行数

默认情况下mysqli_affected_rows返回的值为影响的行数,如果我们需要返回匹配的行数，可以使用mysqli_real_connect函数进行数据库连接的初始化,并在函数的flag参数位加上:

MYSQLI_CLIENT_FOUND_ROWS return number of matched rows, not the number of affected rows

普通格式:

代码如下:int mysqli_affected_rows ( mysqli link )

oop格式：

代码如下:class mysqli {

int affected_rows

}

看下例子：

普通模式,代码如下:

代码如下:<?php

$link = mysqli_connect("localhost", "my_user", "my_password", "world");

if (!$link) {

printf("Can't connect to localhost. Error: %sn", mysqli_connect_error());

exit();

}

/* Insert rows */

mysqli_query($link, "CREATE TABLE Language SELECT * from CountryLanguage");

printf("Affected rows (INSERT): %dn", 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): %dn", mysqli_affected_rows($link));

/* delete rows */

mysqli_query($link, "DELETE FROM Language WHERE Percentage < 50″);

printf("Affected rows (DELETE): %dn", mysqli_affected_rows($link));

/* select all rows */

$result = mysqli_query($link, "SELECT CountryCode FROM Language");

printf("Affected rows (SELECT): %dn", mysqli_affected_rows($link));

mysqli_free_result($result);

/* Delete table Language */

mysqli_query($link, "DROP TABLE Language");

/* close connection */

mysqli_close($link);

?>

oop模式,代码如下:

代码如下:<?php

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */

if (mysqli_connect_errno()) {

printf("Connect failed: %sn", mysqli_connect_error());

exit();

}

/* Insert rows */

$mysqli->query("CREATE TABLE Language SELECT * from CountryLanguage");

printf("Affected rows (INSERT): %dn", $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): %dn", $mysqli->affected_rows);

/* delete rows */

$mysqli->query("DELETE FROM Language WHERE Percentage < 50″);

printf("Affected rows (DELETE): %dn", $mysqli->affected_rows);

/* select all rows */

$result = $mysqli->query("SELECT CountryCode FROM Language");

printf("Affected rows (SELECT): %dn", $mysqli->affected_rows);

$result->close();

/* Delete table Language */

$mysqli->query("DROP TABLE Language");

/* close connection */

$mysqli->close();

?>