PHP MySQL Introduction

2012 年 11 月 8 日6140

PHP MySQL Introduction

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MySQL is the most popular open-source database system.


What is MySQL?

MySQL is a database.

The data in MySQL is stored in database objects called tables.

A table is a collection of related data entries and it consists of columns

and rows.

Databases are useful when storing information categorically. A company may

have a database with the following tables: "Employees", "Products", "Customers"

and "Orders".


Database Tables

A database most often contains one or more tables. Each table is identified

by a name (e.g. "Customers" or "Orders"). Tables contain records (rows) with

data.

Below is an example ofa table called "Persons":

LastName FirstName Address City

Hansen

Ola

Timoteivn 10

Sandnes

Svendson

Tove

Borgvn 23

Sandnes

Pettersen

Kari

Storgt 20

Stavanger

The table above contains three records (one for each person) and four columns (LastName, FirstName, Address, and City).


Queries

A query is a question or a request.

With MySQL, we can query a database for specific information and have a

recordset returned.

Look at the following query:

SELECT LastName FROM Persons

The query above selects all the data in the "LastName" column from the "Persons"

table, and will return a recordset like this:

LastName

Hansen

Svendson

Pettersen


Download MySQL Database

If you don't have a PHP server with a MySQL Database, you can download MySQL

for free here:

http://http://www.zjjv.com///downloads/


Facts About MySQL Database

One great thing about MySQL is that it can be scaled down to support embedded

database applications. Perhaps it is because of this reputation that many people

believe that MySQL can only handle small to medium-sized systems.

The truth is that MySQL is the de-facto standard database for web sites that

support huge volumes of both data and end users (like Friendster, Yahoo,

Google).

Look at

http://http://www.zjjv.com///customers/ for an overview of companies using

MySQL.

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