MySQL 102

1. MySQL 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.
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Http://slideshare.net/davestokes/presentations

2. Agenda
➔ Workbench
➔ User Accounts & Privileges
➔ Tables and Databases
➔ Views
➔ Stored Routines/Procedures
➔ Questions and Answers
➔ Replication (after a break)
David.Stokes@Oracle.com @stoker 2

3. Workbench
 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 3

4. Did I mention free?
http://dev.mysql.com/downloads/workbench/ 4

5. Admin
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6. User Accounts
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7. Users and Hosts
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8. Know whom
can 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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9. Joe's Info
'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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htallation.html

10. Joe's Priviledges
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11. Joe's Limits
Account Limits can be used to throttle user access.
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12. Schema Privileges
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13. Easier than ...
GRANT INSERT, UPDATE,
SELECT
ON world.*
To 'joe'@'%';
FLUSH PRIVILEGES;
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14. Tables & 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 14

15. 1. CREATE DATABASE foo
2. (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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16. 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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17. CREATE a DATABASE, aka SCHEMA
 Use Workbench to
create a schema
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18. Create 'demo'
Here we create a schema named 'demo' with UTF8 character set
and the 'general' 'case insensitive' collation.
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19. Review –
 Workbench will show
the statement used to
create the schema.
 Or you could type in
the SQL by hand.
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20. We have 'demo'
 Double click on demo
to expand the list of
contents
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21. CREATE a table
 Now we can create a
table in the 'demo'
schema
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22. 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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23. Review the SQL
We can see the
SQL that is about
to be executed to
create the table.
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24. Double Check
 Any problems will be
show here as well as
success
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25. 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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26. 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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27. Add some data
 Note we do not have member_id mentioned.
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28. 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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29. 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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30. 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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31. 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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32. Trigger in Action
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33. 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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34. 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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35. Create a VIEW,
use as a table
 SELECT * from get_stuffg
 SELECT Customer from get_stuffg
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36. Stored Routines
Stored 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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37. Questions/Answers
David.Stokes@Oracle.com @stoker 37