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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(); ?>
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