My sql102

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MySQL 102MySQL 102

MySQL 102 is the second part of a presentation to be preceded by MySQL 101

and covers material that will build on the previous presentation.

Http://slideshare.net/davestokes/presentations

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AgendaAgenda➔ Workbench➔ User Accounts & Privileges➔ Tables and Databases➔ Views➔ Stored Routines/Procedures➔ Questions and Answers➔ Replication (after a break)

[email protected] @stoker

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WorkbenchWorkbench FREE http://dev.mysql.com/downloads/ Three tools in one

Query Tool Admin Tool Entity Relationship Mapper

Scripts available for setting up replication, fail over and more

http://dev.mysql.com/doc/refman/5.5/en/getting-mysql.html

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Did I mention free?

http://dev.mysql.com/downloads/workbench/

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Admin

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User Accounts

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Users and Hosts

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Know whomcan do what

We have four accounts Anonymous (%) ODBC joe root

ODBC and joe can login from any host while root and anonymous are local host only

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Joe's InfoJoe's Info

htallation.html

'joe' can connect to the mysqld server from any host. Note he does not have a password which can be a serious security concern.

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Joe's Priviledges

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Joe's Limits

Account Limits can be used to throttle user access.

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Schema Privileges

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Easier than ...GRANT INSERT, UPDATE, SELECTON world.*To 'joe'@'%';FLUSH PRIVILEGES;

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Tables & DatabasesTables & Databases

Databases contain tables, which are used for storing data. Databases also contain objects such as stored routines or triggers. – MySQl 5.0 Certification Guide

httphtml

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1. CREATE DATABASE foo2. (magic)

3. mkdir foo

CREATE DATBASE will create a directory to house .frm files

InnoDB tables will have table spaces for data & indexes

MyISQM can also have .MYD and .MYI files for data and indexes

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Databases db.opt will hold info on

character sets, collations.

Databases can hold zero or more tables plus objects like view, triggers

Databases can not be nested

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CREATE a DATABASE, aka SCHEMA

Use Workbench to create a schema

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Create 'demo'

Here we create a schema named 'demo' with UTF8 character set and the 'general' 'case insensitive' collation.

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Review – Workbench will show

the statement used to create the schema.

Or you could type in the SQL by hand.

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We have 'demo' Double click on demo

to expand the list of contents

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CREATE a table

Now we can create a table in the 'demo' schema

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Creating a Table

Create a table named stuff with a column named member_id that is NOT NULL, AUTOINCREMENT, UNSIGNED and a PRIMARY KEY

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Review the SQLWe can see the SQL that is about to be executed to create the table.

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Double Check Any problems will be

show here as well as success

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SHOW CREATE TABLE

Note that INT(10) means 10 characters will be shown for output. INT(2) will show two places of data by default but still holds upto 2147483647 signed or 4294967295 unsigned.

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After adding two more columns

For the sake of brevity, two more columns have been added for name and email, both are stup to hold CHAR data

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Add some data

Note we do not have member_id mentioned.

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Select data from stuff

Here we select data from the table. Note that member_id was automatically filled in for this record.

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Add a few more records

Here a few more records have been added and the member_id has again has been incremented and inserted.

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Triggers Triggers are 'fired' in response to a an SQL

statement. They can happen before OR after an INSERT,

UPDATE, or DELETE event. They can be used to check values, sum data, etc. You may not want 'logic' in your database and

prefer to have it in the application level.

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Boss: We need to track previous email addresses

Lets track previous email address by placing them in a new column creatively called oldemail.

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Trigger in Action

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Did you catch the mistake?

The previous trigger had a serious logical flaw. Take a look at it and see if you can

spot it.

Hint: Is the email the only thing that will ever get updated?

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VIEWS Views are stored queries that when invoked

produce a result set. A view acts as a virtual table. Can be used to hide table and column names from

programmers. Can be used to gather information from many

tables into one view for simpler access (PHB protector)

Not materialized

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Create a VIEW, use as a table

SELECT * from get_stuff\g SELECT Customer from get_stuff\g

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Stored RoutinesStored Procedures

Stored procedures and Stored Routines take zero or more arguments. A Stored Procedure can pass back values through

output variables or result sets. A function must output exactly ONE scalar variable.

MySQL Follows the ISO:2003 SQL standard syntax for stored routines.

And theses two subjects are not for newbies.

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Questions/AnswersQuestions/Answers

[email protected] @stoker