PHP seven

Mysql connection

PDO

<?php
    $servername = "localhost";
    $username = "username";
    $password = "password";

    try{
    $conn = new PDO("mysql:host=$servername;dbname=myDB",$username,$password);
    echo "连接成功";
}
    catch(PDOException $e){
    echo $e->getMessage();
}
?>

 Close MySQL connection

Example (MySQLi - Object Oriented) $ conn-> close ();

 Example (MySQLi - process-oriented) mysqli_close ($ conn);

 Examples of (PDO) $ conn = null;

 

Create a database to create a table

MySQLi (object-oriented oop): $ conn-> query ($ sql)

MySQLi (process-oriented pop): mysqli_query ($ conn, $ sql)

PDO: PDO Object -> query ($ sql)

? < PHP
     header ( "Content-of the type: text / HTML; charset = UTF-8");   // set the encoding 
    $ ServerName = "localhost" ;
     $ username = "root" ;
     $ password = "root" ; 


    // create connecting 
    $ Conn = mysqli_connect ( $ ServerName , $ username , $ [assword);
     // detect a connection 
    IF (! $ Conn ) {
     Die ( "connection failed:." mysqli_connect_error ()); 
} 
    // Create database 
    $ SQL = " Database myDB drop " ;
    IF ( mysqli_query ( $ conn , $ SQL )) {
     echo "database deleted successfully" ; 
} the else {
   echo "database deletion failed:." mysqli_error ( $ conn );   
} 
    mysqli_close ( $ conn );

MySQL inserting data

Insert a single data: Local execute SQL statements

pop : mysqli_query()

oop:$oop->query()

PDO:$PDO->query()

Insert multiple data

pop:mysqli_multi_query ($con,$sql)

oop:$oop->multi_query()

PDO: $ PDO-> exec () a plurality of data using transactions, or insertion cycle, returns with the error information into the data.