mysqli::$affected_rows
(PHP 5, PHP 7)
mysqli :: $ affected_rows - mysqli_affected_rows - 获取之前MySQL操作中受影响的行数
Description
面向对象的风格
int $mysqli->affected_rows;
程序风格
int mysqli_affected_rows ( mysqli $link )返回受上一个INSERT，UPDATE，REPLACE或DELETE查询影响的行数。
对于SELECT语句，mysqli_affected_rows()的工作方式与mysqli_num_rows()类似。
Parameters
`link` 仅过程样式：由mysqli_connect()或mysqli_init()返回的链接标识符
Return Values
大于零的整数表示受影响或检索的行数。零表示没有记录更新UPDATE语句，没有行与查询中的WHERE子句匹配，或者没有查询尚未执行。-1表示查询返回错误。
注意：如果受影响的行数大于最大整数值（
PHP_INT_MAX），受影响的行数将作为字符串返回。
Examples
Example #1 $mysqli->affected_rows example
面向对象的风格
<?php
$mysqli?=?new?mysqli("localhost",?"my_user",?"my_password",?"world");
/*?check?connection?*/
if?(mysqli_connect_errno())?{
????printf("Connect?failed:?%s\n",?mysqli_connect_error());
????exit();
}
/*?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);
$result->close();
/*?Delete?table?Language?*/
$mysqli->query("DROP?TABLE?Language");
/*?close?connection?*/
$mysqli->close();
?>程序风格
<?php
$link?=?mysqli_connect("localhost",?"my_user",?"my_password",?"world");
if?(!$link)?{
????printf("Can't?connect?to?localhost.?Error:?%s\n",?mysqli_connect_error());
????exit();
}
/*?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($link));
mysqli_free_result($result);
/*?Delete?table?Language?*/
mysqli_query($link,?"DROP?TABLE?Language");
/*?close?connection?*/
mysqli_close($link);
?>上面的例子会输出：
Affected rows (INSERT): 984
Affected rows (UPDATE): 168
Affected rows (DELETE): 815
Affected rows (SELECT): 169 ? 1997–2017 The PHP Documentation Group根据知识共享署名许可证v3.0或更高版本授权。
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