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:<?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:复制代码 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(); ?>

希望本文所述对大家的php程序设计有所帮助。