<?php
//面向过程连接数据库
$conn = mysqli_connect('localhost','root','root');
//判断是否连接成功
if(!$conn){die('连接数据库失败'.mysqli_connect_error());
}else{echo '连接成功';//创建数据库mytest$sql = 'create database mytest';if(mysqli_query($conn,$sql)){echo '执行成功'.$sql;}else{echo '执行失败'.mysqli_error($conn);}//选择数据库并且创建表执行插入语句if(mysqli_query($conn,'use mytest')){echo '切换数据库成功';$sql = "create table mytest(id int auto_increment primary  key,name varchar(14) not null) ";//如创建表成功if(mysqli_query($conn,$sql)){echo '创建成功'.$sql;}else{echo '创建失败'.mysqli_error($conn);}//插入多条数据   插入一条数据时候后面不需要分号$sql="insert into mytest (name) values ('webcyh');";$sql.="insert into mytest (name) values ('hony');";//如果只是插入一条数据这里可以改为普通查询函数mysqli_query()if(mysqli_multi_query($conn,$sql)){echo '插入成功'.$sql;}else{echo '插入失败'.mysqli_error($conn);}}//关闭数据库连接mysqli_close($conn);
}

<?php
//面向过程连接数据库
$conn = mysqli_connect('localhost','root','root');
//判断是否连接成功
if(!$conn){die('连接数据库失败'.mysqli_connect_error());
}else{echo '连接成功';//创建数据库mytest$sql = 'create database mytest';if(mysqli_query($conn,$sql)){echo '执行成功'.$sql;}else{echo '执行失败'.mysqli_error($conn);}//选择数据库并且创建表执行插入语句if(mysqli_query($conn,'use mytest')){echo '切换数据库成功';$sql = "create table mytest(id int auto_increment primary  key,name varchar(14) not null) ";//如创建表成功if(mysqli_query($conn,$sql)){echo '创建成功'.$sql;}else{echo '创建失败'.mysqli_error($conn);}//插入多条数据$sql="insert into mytest (name) values ('webcyh');";$sql.="insert into mytest (name) values ('hony');";
mysqli_autocommit($conn,FALSE);if (mysqli_multi_query($conn,$sql)){do {if ($result = mysqli_store_result()) {while ($row = result_fetch_row($rst)) {echo $row[0];}}} while (mysqli_next_result($conn));}mysqli_commit($conn);$sql='select name from mytest';$rst=mysqli_query($conn,$sql);var_dump($rst);//判断是否有结果if(mysqli_num_rows($rst)>0){echo '查询结果如下';while($row=mysqli_fetch_assoc($rst)){echo '姓名'.$row["name"];}}else{echo '没有结果'.mysqli_error($conn);}//查询数据并且输出
    }//关闭数据库连接mysqli_close($conn);
}

<?php
//mysqli面向对象使用mysql实例 如果你使用其他端口（默认为3306），为数据库参数添加空字符串，如: new mysqli("localhost", "username", "password", "", port)
$conn = new  mysqli('localhost','root','root');
//判断是否连接成功
if($conn->connect_error){echo '连接失败'.$conn->connect_error;//或者mysqli_connect_error();
}else{
//切换数据库$sql='use mytest';if($conn->query($sql) == TRUE){echo '切换成功';//插入数据使用语句预处理操作$stml=$conn->prepare("insert  into test(name) values(?)");//绑定参数$stml->bind_param("s",$name);$name='webcyh';$stml->execute();echo  '插入成功';$stml->close();//查询数据$sql='select * from test';$rst=$conn->query($sql);if($rst->num_rows>0){while($row = $rst->fetch_assoc()){echo $row['name'];}}}else{echo '切换失败'.$conn->error;}}//关闭数据库
$conn->close();