我用的环境是wampServer集成的软件包 在php连接MySQL数据库的时候老是出现这个问题Warning: mysqli_connect(): (HY000/1045): Access denied for user ‘root‘@‘localhost‘ (using password: YES) 你好，我也遇到过这个问题，下面是我的解决方法：首先，通过WAMP打开mysql控制台。提示输入密码，因为现在是空，所以直接按回车。（wamp 默认数据库密码为空）然后输入“use mysql”，意思是使用mysql这个数据库，提示“Database...
musqli扩展库操作mysql数据库步骤： 1.获取连接并选择数据库//语法 mysqli_connect(host,username,password,dbname,port,socket);$conn=mysqli_connect("127.0.0.1",‘root‘,‘‘,‘user‘);if (!$conn) {die("链接失败");}2.设置操作编码// 语法：mysqli_set_charset(connection,charset); // 修改数据库连接字符集为 utf8 mysqli_set_charset($conn,"utf-8") ;3.发送sql指令（分为ddl语句和dml语句、dql语句、dtl语句）ddl语句：...
//调用数据库的函数function connetionsql(){$conn=mysqli_connect("127.0.0.1",‘root‘,‘‘,‘user‘);if (!$conn) {die("连接失败".mysqli_error());}mysqli_set_charset($conn,"utf8");$sql="select * from user1";$res=mysqli_query($conn,$sql);// mysqli_affected_rows()返回前一次 MySQL 操作所影响的记录行数。// $row=mysqli_affected_rows($conn);// mysqli_num_fields() 返回结果集中字段的数量。$col=mysqli_num_...
//数据库：create table account(id int primary key,balance float); //银行转账$mysqli=new MySQLi("localhost",‘root‘,‘‘,‘test‘);if ($mysqli->connect_error) {echo $mysqli->connect_error;}//将提交设为假$mysqli->autocommit(FALSE);$sql1="update account22 set balance=balance+2 where id=‘1‘;";$sql2="update account1 set balance=balance-2 where id=‘2‘;";$a=$mysqli->query($sql1);$b=$mysqli->query($s...
$mysqli= new mysqli(‘localhost‘, ‘root‘, ‘root‘, ‘test‘); 2 if (mysqli_connect_errno()) {printf("连接失败: %s\n", mysqli_connect_error());exit();} 1 2 $city = "宿迁2";3 4 /* 创建准备好的语句 "SELECT District FROM City WHERE Name=?") */5 if ($stmt = $mysqli->prepare("SELECT District FROM tree WHERE Name=?")) {6 7 /* bind parameters for markers */8 $stmt->bind_param("s", $c...
单条件查询<body><div align="center" style="width:90%;"><h1>数据查询</h1><form method="post" action="test-1.php"><div>请输入汽车品牌:<input type="text" name="name"/></div><br /><div><input type="submit" value="查询" name="chaxun"/></div><br /></form><div><table width="90%" border="1" align="center" style="text-align:center;"><tr><td>汽车代号</td><td>汽车名字</td><td>系列代号</td><td>汽车油耗</td><t...
查看是否有mysqli.so cd /usr/lib64/php/modules/ #没有则安装 yum install php-mysql discuz安装：mysqli_connect()不支持advice_mysqli_connect标签：安装 dir tar net div unknown ack install order 本文系统来源：https://www.cnblogs.com/huiy/p/8337323.html
<table width="100%" border="1" cellpadding="0" cellspacing="0"><tr><td>代号</td><td>名称</td><td>性别</td><td>民族</td><td>生日</td></tr><?php$db = new MySQLi("localhost","root","123","mydb");$sql = "select * from info";$result = $db->query($sql);if($result){$arr = $result->fetch_all();foreach($arr as $v){echo "<tr><td>{$v[0]}</td><td>{$v[1]}</td><td>{$v[2]}</td><td>{$v[3]}</td><td>{$v[4]}</td></t...
<?php$mysqli = new Mysqli();$mysqli->connect("localhost","root","root","test");if ( $mysqli->connect_errno ){die( $mysqli->connect_error );}$mysqli->set_charset("utf8");$sql = "insert into mysqli (id, name) values (null, ‘liming‘)";$res = $mysqli->query($sql);var_dump($res);if( $res ){echo $mysqli->insert_id; } else {echo "error:".$mysqli->errno." : ".$mysqli->error;}$mysqli->close(); ?> 执行...
<?php$mysqli = new Mysqli();$mysqli->connect("localhost","root","root","test");if ( $mysqli->connect_errno ){die( $mysqli->connect_error );}$mysqli->set_charset("utf8");$sql = "select * from mysqli;";$mysqli_result = $mysqli->query($sql);if( ! $mysqli_result ){echo "error:".$mysqli->errno." : ".$mysqli->error;} else {print_r( $mysqli_result ); //打印查看会是一个mysqli_result对象}$mysqli->close(); ...
需要注意的是：多条用分号分隔的SQL语句中，只要有一条SQL语句执行失败，那么这一条SQL语句以及之后的SQL语句就不会执行。只有当第一条SQL语句执行失败，那么multi_query()的返回值才为false。如果第一条SQL语句执行成功了，那么都会返回true。<?php$mysqli = new Mysqli();$mysqli->connect("localhost","root","root","test");if ( $mysqli->connect_errno ){die( $mysqli->connect_error );}$mysqli->set_charset("utf8");$sql ...
Client Client API version => 5.6.37 Client API library version => 5.6.37 Client API header version => 5.5.56-MariaDB Client API version => 5.6.37 解决方法 yum remove php-mysql yum install php-mysqlnd 重启 nginx，php-fpmsystemctl restart php-fpm systemctl restart nginx 遇到问题的场景 我是在安装Z-Blog时遇到的报错，还需要注意一点，就是关闭SElinux。 因为一旦c_option.php创建失败，Z-Blog的模板就在也...
<title>index.php</title><?php #连接数据库 $conn = mysqli_connect("localhost","root",""); #判断是否连接成功 if(!$conn){ echo "失败"; } //选择数据库 mysqli_select_db($conn,"bbs"); //准备sql语句 $sql = "select * from bbs_user"; //发送sql语句 $obj = mysqli_query($conn,$sql); echo "<center>"; echo "<table border = 1 c...
//求出总条数 假如13条/*需求：每页只显示5条 即分三页* ceil(总条数/每页显示数) ceil是向上取整，就算剩一条也要单独占一页*/select * from bbs_user limit 0 , 5 这是第一页 1select * from bbs_user limit 5 , 5 这是第二页 2select * from bbs_user limit 10 , 5 这是第三页 3 select * from bbs_user limit 15 , 5 这是第四页 4推出来的公式 ($page - 1) * $sum (5) //$page是当前页数先写好了查询页面，如下：...
重大新特性 支持 Redis/PDO/MySQLi 从4.1.0版本开始支持了对PHP原生Redis、PDO、MySQLi协程化的支持。 可使用Swoole\Runtime::enableCorotuine()将普通的同步阻塞Redis、PDO、MySQLi操作变为协程调度的异步非阻塞IOSwoole\Runtime::enableCoroutine();go(function () {$redis = new redis;$retval = $redis->connect("127.0.0.1", 6379);var_dump($retval, $redis->getLastError());var_dump($redis->get("key"));var_dump($redis-...