PHP中mysqli_affected_rows作用行数返回值分析
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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:
int mysqli_affected_rows ( mysqli link )
oop格式:
- class mysqli {
- int affected_rows
- }
看下例子:
普通模式,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:
- <?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();
- //www.phpfensi.com
- /* Delete table Language */
- $mysqli->query("DROP TABLE Language");
- /* close connection */
- $mysqli->close();
- ?>
Tags: mysqli_affected_rows PHP作用返回值
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