PHP中mysqli_affected_rows作用行数返回值分析_php技巧

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:

int mysqli_affected_rows ( mysqli link )

oop格式：

class mysqli { <br />int affected_rows <br />}

看下例子：

普通模式,代码如下:

<?php <br />$link = mysqli_connect("localhost", "my_user", "my_password", "world"); <br /> <br />if (!$link) { <br />printf("Can't connect to localhost. Error: %sn", mysqli_connect_error()); <br />exit(); <br />} <br /> <br />/* Insert rows */ <br />mysqli_query($link, "CREATE TABLE Language SELECT * from CountryLanguage"); <br />printf("Affected rows (INSERT): %dn", mysqli_affected_rows($link)); <br /> <br />mysqli_query($link, "ALTER TABLE Language ADD Status int default 0″); <br /> <br />/* update rows */ <br />mysqli_query($link, "UPDATE Language SET Status=1 WHERE Percentage > 50″); <br />printf("Affected rows (UPDATE): %dn", mysqli_affected_rows($link)); <br /> <br />/* delete rows */ <br />mysqli_query($link, "DELETE FROM Language WHERE Percentage < 50″); <br />printf("Affected rows (DELETE): %dn", mysqli_affected_rows($link)); <br /> <br />/* select all rows */ <br />$result = mysqli_query($link, "SELECT CountryCode FROM Language"); <br />printf("Affected rows (SELECT): %dn", mysqli_affected_rows($link)); <br /> <br />mysqli_free_result($result);</p><p>/* Delete table Language */ <br />mysqli_query($link, "DROP TABLE Language"); <br /> <br />/* close connection */ <br />mysqli_close($link); <br />?>

oop模式,代码如下:

<?php <br />$mysqli = new mysqli("localhost", "my_user", "my_passwo<strong>）本文来（源gaodai#ma#com搞@@代~&码*网2</strong><pre>搞代gaodaima码

rd”, “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();
?>

希望本文所述对大家的php程序设计有所帮助。

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