The operation of using PHP to access MySQL database and adding and deleting instances

PHP access MySQL database

<?php//Build Connection object $db = new mysqli ("localhost", "root", "", "0710_test");//write SQL statement $    sql = "SELECT * from student";//detects if the connection database is successful, fails to return "Connection failed" and exits program if (Mysqli_connect_error ()) {die ("Connection failed"); }//executes the SQL statement, returns the result set object $result = $db->query ($sql); Var_dump ($result->num_rows);//The result has no data if ($result->num_rows {echo "exists data";} Fetch data (query statement)//$arr = $result->fetch_all ();//Get all the data and exist in a two-dimensional array//$arr = $result->fetch_all (MYSQLI_ASSOC);// Gets the associative array in all data//$arr = $result->fetch_array ();//while loops through all the data in the array while ($arr = $result->fetch_array ()) {Var_dump ($ ARR);} $arr = $result->fetch_assoc ();//returns associative array//$arr = $result->fetch_object ();//Column name corresponds to member variable//$arr = $result->fetch_ Row ();//returns the index array//var_dump ($ARR); Add and Subtract statements//adds a data (return value TRUE or false) $sql = "INSERT into student values (' 102 ', ' king ', ' Male ', ' 1987-7-1 ', ' 95033 ')";//delete a piece of data ( The return value is True or false) $sql = "Delete from student where Sname= ' Li June '"; $r = $db->query ($sql); Var_dump ($R); 

Additions and deletions of the self-growing list in the database

<?php $db = new mysqli ("localhost", "root", "" "," 0710_info "), if (Mysqli_connect_error ()) {die    (" Connection Failed ");} $sql = "INSERT into work values (0, ' P005 ', ' 2005-01-01 ', ' 2010-10-1 ', ' shan Normal University ', ' Ministry of Education ', 2)"; if ($db->query ($sql)) {    echo "Add success";    Insert ID for this data (common)    echo $db->insert_id;} else{    echo "Add Failed";}? >