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Session 5: Working with MySQL

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

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Session 5: Working with MySQL

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

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

  3. 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

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

  5. 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

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

  7. Using phpMyAdmin • Go to the website http://www.phpmyadmin.net/ • Download the package phpMyAdmin 2.11.7…..zip • Unpack to the C:\www\myadmin • Create folder C:\www\myadmin\config • In your web browser, navigate to http://localhost/myadmin /scripts/setup.php

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

  9. 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

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

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

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

  13. 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

  14. 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

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

  16. 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

  17. 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

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

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

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

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

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

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

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

  25. 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) • Email, 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

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