1. 它返回上次连接的错误列表 mysqli_error - 返回值 它返回一个包含错误描述的字符串。 mysqli_error - 示例 <?php $connection_mysql=mysqli_connect("host_name","user","password","db"); if (mysqli_connect_errno($connection_mysql)){ echo "Failed to connect to MySQL: " . mysqli_connect_...
在php中,可以使用mysqli_connect函数来建立与MySQL数据库的连接。如果连接失败,可以通过mysqli_connect_error函数获取连接错误信息。例如: 代码语言:php 复制 $conn = mysqli_connect("localhost", "username", "password", "database"); if (!$conn) { die("连接失败: " . mysqli_connect_error()); } ...
mysql> update usersetname='zhangsan';Query OK,0rows affected(0.00sec) Rows matched:1Changed:0Warnings:0mysql> update usersetusername='zhangsan';ERROR1054(42S22): Unknown column'username'in'field list' 要在PHP中区分上面 第2条 和第3条SQL语句,使用如下代码: 1 2 3 4 5 6 7 8 $conn=mysql...
php $con = mysqli_connect("localhost", usr, pwd, instance); mysqli_set_charset( $con, "utf8mb4" ); if (mysqli_connect_errno($con)) { die('Failed to connect to MySQL : ' .mysqli_connect_error()); } $aA= (int)$_POST['AA']; $aB= (int)$_POST['AB']; $c3po= $_...
php$servername="localhost";$username="username";$password="password";$dbname="database";// 创建连接$conn=mysqli_connect($servername,$username,$password,$dbname);// 检查连接是否成功if(!$conn){die("连接失败: ".mysqli_connect_error());}// 错误查询$sql="SELECT * FROM non_existent_table...
php中mysqli_error($conn)的用法 注意:用函数判断sql语句是否有错需要把这个函数写在mysqli_query("$conn连接语句","$sql语句")后面才能进行检测。 返回值:返回最近调用函数的最后一个错误描述 使用:mysqli_error($conn); $conn = mysqli_connect("127.0.0.1","root","","xz",3306);...
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PHP mysqli error() Function: The mysqli_error() function / mysqli::$error returns the last error description for the most recent function call, if any.
PHP MySQLi 参考手册实例 返回最近调用函数的最后一个错误代码: <?php // 假定数据库用户名:root,密码:123456,数据库:RUNOOB $con=mysqli_connect("localhost","root","123456","RUNOOB"); if (mysqli_connect_errno($con)) { echo "连接 MySQL 失败: " . mysqli_connect_error(); } // 执行查询...
这是php执行顺序的问题，当你代码流程走到错误处的时候是会直接报错不会再继续往下走的，出于上下文的关系可能密切联系，上文如果错了，下文就不知道到底应该怎么走了。