PHP7进行数据库操作（连接、增删改查操作）-PHP7

更新
mysqli连接，推荐

$conn = mysqli_connect('127.0.0.1','root2','root2');mysqli_select_db($conn,'jianshu');$sql = "select * from posts";$result = mysqli_query($conn,$sql);while($row = mysqli_fetch_assoc($result)){var_dump($row);}

推荐（免费）：php7

处理错误

mysqli_connect_errno()错误代码mysqli_connect_error()错误内容if (!$link) {exit('error('.mysqli_connect_errno().'):'.mysqli_connect_error());//不继续向下执行//die}

设定字符集

mysqli_set_charset($conn,'utf8');

取值

mysqli_fetch_allmysqli_fetch_arraymysqli_fetch_assocmysqli_fetch_num//mysqli_fetch_array默认返回MYSQLI_BOTH//MYSQLI_ASSOC、 MYSQLI_NUM 、MYSQLI_BOTH默认//[0] => 34 [id] => 34 [1] =>Linux常用技巧 [title] => Linux常用技巧print_r(mysqli_fetch_all($result));mysqli_fetch_array//默认返回两种MYSQLI_BOTH//MYSQLI_ASSOC MYSQLI_NUM MYSQLI_BOTH默认//[0] => 34 [id] => 34 [1] =>Linux常用技巧 [title] => Linux常用技巧print_r(mysqli_fetch_array($result,MYSQLI_NUM));mysqli_fetch_num//获取查询结果中的一条数据，为索引数组（数据库第一条，不一定是最小或最大id）//执行后，指向下一条数据// [0] => 34 [1] => Linux常用技巧 [2] => 28echoprint_r(mysqli_fetch_row($result));mysqli_fetch_assoc//获取查询结果中的一条数据，为关联数组（数据库第一条，不一定是最小或最大id）//执行后，指向下一条数据// [id] => 34[title] => Linux常用技巧 [read] => 28echo print_r(mysqli_fetch_assoc($result));

关闭资源、关闭数据库

mysqli_free_result($result);//释放结果资源mysqli_close($conn); //关闭数据库连接

mysql连接（不推荐）

$link = mysql_link('localhost','root','123') or die('error');my_select_db('user',$link) or die('error');$sql = "";$result = mysql_query($sql);$count = mysql_num_rows($result);while($row = mysql_fetch_assoc($result)){echo $row['id'];}

以前的

1、连接（mysqli方式）

$con = new mysqli("localhost", "username", "password", "databasename");

2、查询

$con->query('set names utf8;'); $sql = "SELECT * FROM tablename";  $result = $con->query($sql);  $data=array();while ($tmp=mysqli_fetch_assoc($result)) {$data[]=$tmp;}var_dump($data);

3、插入

$con->query('set names utf8;');    $sql="INSERT INTO tablename (name,telphone) VALUES ('name','telphone')";if($result = $con->query($sql)){        echo "成功";}else{echo "失败";}

以上就是PHP7进行数据库操作（连接、增删改查操作）的知识。速戳>>知识兔学习精品课！