![]() ![]() To delete a stored function, use the DROP FUNCTION command: mysql>DROP FUNCTION calculate_bonus Views To modify an existing function, use the ALTER FUNCTION command: mysql>DELIMITER $ Note:- Stored procedures and functions support complex logical syntax features, including conditionals and looping statements. Once created you can call calculate_bonus() from within a query: mysql>SELECT name, phone, calculate_bonus(id) FROM authors >SELECT count(id) AS article_count FROM articles >(employee_id INTEGER) RETURNS DECIMAL(5,2) In this section, a brief refresher is provided regarding managing what is arguably the more useful of the two, namely stored functions.Ī stored function is created using the CREATE FUNCTION command. ![]() Stored procedures are executed using the CALL statement, and can return values as MySQL variables, whereas stored functions can be called directly from within a MySQL like any other standard MySQL function. MySQL collectively refers to stored procedures and stored functions as stored routines. While executing standard SQL statements is likely an old hat for most users, it may be more difficult to recall the syntax pertinent to some of MySQL’s relatively new SQL features, namely Stored Routines, Views, and Triggers. For instance, when logged into the MySQL client execute the following command to change your prompt to MySQL ( ) mysql>prompt mysql (\U)> However, like most shells, you can modify MySQL’s prompt to your liking. MySQL’s default prompt is enough to remind you are currently logged into MySQL rather than into an operating system shell. To log out of the MySQL server, use quit or the \q flag:- mysql>quit %>mysql -h hostname -u username -p database_name If you are connecting to a remote database, pass the hostname or IP address along using the -h option:. ![]() To save some time you can pass the desired database along on the command line when logging in: %>mysql -u username -p database_name ![]() Once you’re logged in, you can select a database or begin carrying out other administrative tasks. Server version: 5.1.22-rc-community MySQL Community To login into the MySQL server using the MySQL client, you’ll typically provide your MySQL username and password:. My.cnf file’s range of impact on the MySQL server is location-dependent: While it’s possible to tweak these parameters by passing them as flags when starting the MySQL server, typically you’ll want to ensure they’re always set at server startup, done by adding them to my.cnf file. MySQL supports over 260 configuration parameters, capable of controlling behavior regarding memory, logging error reporting, and much more. MySQL is very friendly with PHP, the most popular language for web development.MySQL uses a standard form of the well-known SQL data language.MySQL supports many operating systems with many languages like PHP, PERL, C, C++, JAVA, etc.MySQL is quicker than other databases so it can work well even with the large data set.MySQL is customizable because it is an open-source database and the open-source GPL license facilities, programmers, to modify the SQL software according to their own specific environment.MySQL is a very powerful program so it can handle a large set of functionalities of the most expensive and powerful database packages.MySQL is an open-source database so you don’t have to pay a single penny to use it.MySQL became so popular because of the following reasons: Covering topics such as configuration, administration software, backup procedures, SQL features, and user management, this reference will serve as a handy desk for countless projects to come. This reference is created to help you quickly navigate some of MySQL’s most popular features. This language is sporting a barrier of entry low enough to attract novice developers yet strong enough to power some of the world’s most popular websites, among them Yahoo!, BBC News, the US Census Bureau, and Craigslist. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |