PHP中mysqli_affected_rows作用行数返回值分析

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:
复制代码 代码如下:int mysqli_affected_rows ( mysqli link )

oop格式：
复制代码 代码如下:class mysqli {
int affected_rows
}
看下例子：

普通模式,代码如下:
复制代码 代码如下: $link = mysqli_connect("localhost", "my_user", "my_password", "world");
 
if (!$link) {
printf("Can't connect to localhost. Error: %sn", mysqli_connect_error());
exit();
}
 

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″);
 

mysqli_query($link, "UPDATe Language SET Status=1 WHERe Percentage > 50″);
printf("Affected rows (UPDATE): %dn", mysqli_affected_rows($link));
 

mysqli_query($link, "DELETE FROM Language WHERe Percentage < 50″);
printf("Affected rows (DELETe): %dn", mysqli_affected_rows($link));
 

$result = mysqli_query($link, "SELECT CountryCode FROM Language");
printf("Affected rows (SELECt): %dn", mysqli_affected_rows($link));
 
mysqli_free_result($result);

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

mysqli_close($link);
?>
oop模式,代码如下:
复制代码 代码如下: $mysqli = new mysqli("localhost", "my_user", "my_password", "world");
 

if (mysqli_connect_errno()) {
printf("Connect failed: %sn", mysqli_connect_error());
exit();
}
 

$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″);
 

$mysqli->query("UPDATe Language SET Status=1 WHERe Percentage > 50″);
printf("Affected rows (UPDATE): %dn", $mysqli->affected_rows);
 

$mysqli->query("DELETE FROM Language WHERe Percentage < 50″);
printf("Affected rows (DELETe): %dn", $mysqli->affected_rows);
 

$result = $mysqli->query("SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %dn", $mysqli->affected_rows);
 
$result->close();
 

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

$mysqli->close();
?>

希望本文所述对大家的php程序设计有所帮助。