对PHP函数mysqli_affected_rows的作用行数返回值的分析

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(); 
?>

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