MySqlLoop.php - MySQL Functions Test

This section provides a tutorial example on how to use MySQL functions to connect to a MySQL server, and run SQL statements to create a table, insert rows and fetch rows with the MySQL server.

To show you how some of those MySQL functions should be used, I wrote this simple script, MySqlLoop.php:

<?php
#  MySqlLoop.php
#- Copyright (c) HerongYang.com. All Rights Reserved.
#
   $con = mysqli_connect("localhost", "root", "");
   $rs = mysqli_query($con,'DROP DATABASE MyBase');
   $rs = mysqli_query($con,'CREATE DATABASE MyBase');
   if (!$rs) {
      echo "Error: Unable to create the database.\n";
      echo mysqli_connect_errno()." - ".mysqli_connect_error()."\n";
      exit;
   }
   $rs = mysqli_query($con,'USE MyBase');
   print "Creating a table...\n";
   $rs = mysqli_query($con,'CREATE TABLE MyTable (ID INTEGER,'
      .' Value INTEGER)');
   $n = 100;
   $i = 0;
   print "Inserting some rows to the table...\n";
   while ($i < $n) {
      $rs = mysqli_query($con,'INSERT INTO MyTable VALUES ('.$i.', '
         .rand(0,$n-1).')');
      $i++;
   }
   print "Query some rows from the table...\n";
   $rs = mysqli_query($con,'SELECT * FROM MyTable WHERE ID < 10');
   print "   ".mysqli_field_name($rs,0)."   "
      .mysqli_field_name($rs,1)."\n";
   while ($row = mysqli_fetch_array($rs)) {
      print "    ".$row[0].'   '.$row[1]."\n";
   }
   mysqli_free_result($rs);
   mysqli_close($con);

function mysqli_field_name($result, $field_offset) {
   $properties = mysqli_fetch_field_direct($result, $field_offset);
   return is_object($properties) ? $properties->name : null;
}
?>

Note that if the connection resource is not specified in a query call, the last connection resource will be used. If you run this script, you will get something like:

Creating a table...
Inserting some rows to the table...
Query some rows from the table...
   ID   Value
    0   14
    1   91
    2   84
    3   16
    4   88
    5   51
    6   12
    7   19
    8   39
    9   5

Table of Contents

 About This Book

 Introduction and Installation of PHP 7.3

 PHP Script File Syntax

 PHP Data Types and Data Literals

 Variables, References, and Constants

 Expressions, Operations and Type Conversions

 Conditional Statements - "if" and "switch"

 Loop Statements - "while", "for", and "do ... while"

 Function Declaration, Arguments, and Return Values

 Arrays - Ordered Maps

 Interface with Operating System

 Introduction of Class and Object

 Integrating PHP with Apache Web Server

 Retrieving Information from HTTP Requests

 Creating and Managing Sessions in PHP Scripts

 Sending and Receiving Cookies in PHP Scripts

 Controlling HTTP Response Header Lines in PHP Scripts

 Managing File Upload

MySQL Server Connection and Access Functions

 Configuring PHP for MySQL Server Access

 mysqli_connect() and Other MySQL Functions

MySqlLoop.php - MySQL Functions Test

 Functions to Manage Directories, Files and Images

 SOAP Extension Function and Calling Web Services

 SOAP Server Functions and Examples

 Localization Overview of Web Applications

 Using Non-ASCII Characters in HTML Documents

 Using Non-ASCII Characters as PHP Script String Literals

 Receiving Non-ASCII Characters from Input Forms

 "mbstring" Extension and Non-ASCII Encoding Management

 Managing Non-ASCII Character Strings with MySQL Servers

 Parsing and Managing HTML Documents

 Configuring and Sending out Emails

 Image and Picture Processing

 Managing ZIP Archive Files

 Managing PHP Engine and Modules on macOS

 Managing PHP Engine and Modules on CentOS

 Outdated Tutorials

 References

 Full Version in PDF/EPUB