An Introduction to Stored Procedures in MySQL 5. MySQL 5 introduced a plethora of new features - stored procedures being one of the most significant.
In this tutorial, we will focus on what they are, and how they can make your life easier. Introduction “ A stored routine is a set of SQL statements that can be stored in the server.” A stored procedure is a method to encapsulate repetitive tasks. They allow for variable declarations, flow control and other useful programming techniques. The “academic” position on this is quite clear and supports the extensive use of stored procedures. Pros Share logic with other applications. Cons Increased load on the database server -- most of the work is done on the server side, and less on the client side.There's a decent learning curve.
The tool that I am working with in this tutorial, MySQL Query Browser, is pretty standard for database interactions. Additionally, I'll be using very rudimentary table structures, strictly to ease the explanation. Step 1 - Picking a Delimiter Creating a Stored Procedure. Real Programmers: How To: Set Up An Ssh Tunnel With Putty. Realprogrammers.com What follow is how to set up as SSH tunnel using PuTTY with the MySQL port (3306) forwarded as an example.
After completing this how-to you'll have port 3306 on your local machine listening and forwarding to your remote server's localhost on port 3306. Thus effectively you can connect to the remote server's MySQL database as though it were running on your local box. Prerequisites This how-to assumes your MySQL installation has enabled listening to a TCP/IP connection.
To achieve the same with PostgreSQL simply use PostgreSQL's default port, 5432. psql -h 127.0.0.1 rest of options to test; /etc/postgresql/pg_hba.conf and the manual as pointers for configuration. Set up the tunnel Create a session in PuTTY and then select the Tunnels tab in the SSH section. Add the tunnel Click the Add button and the screen should look like this, Save the session Open the session. MySQL Gotchas. It's not a bug - it's a gotcha.
A "gotcha" is a feature or function which works as advertised - but not as expected. When working with the MySQL ™ database server I have repeatedly encountered situations where the results of various actions have been unexpected and/or contrary to the behaviour generally expected of an SQL relational database. The cause can usually be traced to implementation details which are documented in the manual. I have created this list in order to further a better understanding of the MySQL database server and hopefully save others unnecessary headscratching. The MySQL database server is being continually improved. Note: this document contains many examples as they would appear in the MySQL command line client mysql ("mysql monitor"). 1.1.
In SQL NULL represents the the absence of a value. Example 1. CREATE TABLE null_1 ( id INT NOT NULL, text1 VARCHAR(32) NOT NULL, text2 VARCHAR(32) NOT NULL DEFAULT 'foo'); Example 2. The manual explains this behaviour thus: Note. Get It Done With MySQL, Artful Software Development, Artful applications.