PHP中mysqli_affected_rows作用行數傳回值

mysqli中關於update操作影響的行數可以有兩種返回形式：

1. 返回匹配的行數

2. 返回影響的行數

預設情況下mysqli_affected_rows返回的值為影響的行數，如果我們需要返回匹配的行數，可以使用mysqli_real_connect函數進行資料庫連接的初始化，並在函數的flag參數位加上：

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

代碼如下

複製代碼

<?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

代碼如下

複製代碼

<?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(); ?>