Session 5: Working with MySQL iNET Academy Open Source Web Development

Objectives Introduction of MySQL Managing the Database Using phpMyAdmin & SQLyog Structure Query Language

MySQL Database MySQL client interface Login: require an username and a password Different user has different access level to databases and tables To connect to a MySQL Database we need The IP address of the database server The name of the database The username The password Several ways to connect to MySQL database The command line phpMyAdmin SQLyog

Accessing DB from the Command Line Using MySQL command-line client. First, open the OS command line Type mysql -h hostname –u user -p

Prompts & Commands At the MySQL prompt, user can enter database command followed by Enter To see the list of commands that MySQL supports, type help or \h Eg: show databases, use

Managing the Database Creating Users Creating users need root permission Creating a database Using a database

Using phpMyAdmin Go to the website Download the package phpMyAdmin …..zip Unpack to the C:\www\myadmin Create folder C:\www\myadmin\config In your web browser, navigate to /scripts/setup.php

Using phpMyAdmin (cont.) In the Servers section, click the Add button. The Server setup page displays as following

Using phpMyAdmin (cont.) Most of the default values can be left alone. You do need to enter the password for the root MySQL user in the “Password for config auth” field. Select “cookie” from Authentication type to limit access to your MySQL data to only users with a MySQL account. Click Add Click “Save” from the Configuration section to save your changes to the configuration file. Copy the config.inc.php file tp myadmin. Remove the config directory

Using phpMyAdmin (cont.) In your web browser, navigate to Your web browser displays a login page as followinghttp://localhost/myadmin

Using SQLyog Go to the \\dc computer and download the SQLyog519.exe\\dc Install SQLyog using Installation Wizard Run the SQLyog program Type the root’s password Click “Connect”

Using SQLyog (cont.) The main window of SQLyog displays as following

Database Concept & SQL Database are repository of structured information SQL: Structured Query Language is the language used to manage and manipulate data stored in relational database

Creating tables The title_id column is an integer. The auto_increment keyword make this field’s value automatically is assigned an unique value during row insertion. The title column holds text up to 150 characters The pages column is an integer The PRIMARY KEY attribute tells MySQL which fields is the key value

Creating Tables (cont.) To verify a table, use DESCRIBE

Adding Data to Table Use INSERT command. Syntax: INSERT INTO table COLUMNS ([columns]) VALUES ([values]); Rules: Numeric values shouldn’t be quoted String values should always be quoted Date and time value should always be quoted Function shouldn’t be quoted NULL should never be quoted

Table Definition Manipulation Renaming a table: ALTER TABLE table RENAME new_table Changing a column’s data type: ALTER TABLE table MODIFY column datatype Changing the order of columns: Renaming a column: ALTER TABLE table CHANGE column_name new_column_definition Removing a column: ALTER TABLE table DROP column Deleting an entire table: DROP TABLE table

Querying the Database SELECT columns FROM tables [WHERE CLAUSE]; [ORDER BY CLAUSE]

Querying the Database (cont.) Limit results with WHERE If there is more than one condition, logical operators Like AND or OR are used

Querying the Database (cont.) Specifying the order Join tables together

Querying the Database (cont.) Natural joins Join on Alias

Modifying & Deleting Database Data Use UPDATE command to modify the data USE DELETE command to delete the data

Search Functions Use the LIKE operator The % sign indicates that anything can match The _ sign indicates that exact one character can match

Logical Operators Use AND, OR and NOT operators in WHERE clause

Practice In this practice, you will Create a table named “user” which have following fields ID, integer, PrimaryKey, auto_increment Name, varchar (100) Gender, tinyint (1) , varchar (100) Insert 5 users into the table “user” Create a table named “user_log” which have following fields user_id, integer time_of_login time_of_logout number_of_pages_view Insert login and logout information of 5 users above Find the user detail based on time_of_login or time_of_logout Find the user have the maximum number_of_pages_view Find the user have the maximum login times Practice using the LIKE operator