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MySQL

John Lavigne COT 4810 Tuesday, March 25, 2008. MySQL. Databases. “A comprehensive collection of related data organized for convenient access, generally in a computer.” - dictionary.com Useful to store information in similar formats Information stored in tables with common categories.

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MySQL

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  1. John Lavigne COT 4810 Tuesday, March 25, 2008 MySQL

  2. Databases • “A comprehensive collection of related data organized for convenient access, generally in a computer.” - dictionary.com • Useful to store information in similar formats • Information stored in tables with common categories

  3. Why use Databases? • They are useful for storing especially large amounts of information? • When you want to use something else (arrays maybe?)‏

  4. Advantages of Relational Databases • Speed – Quick Storage and Retrieval of Information • Thoroughness – can report results as thorough as the information stored • Accuracy – Accurate and consistent Results • Reporting – Information can be efficiently gathered and analyzed

  5. SQL • Created in the 1970s • Evolved as Databases grew in size • Standard set by ISO/IEC 9075:1992, also known as ANSI SQL-92

  6. SQL • Common implementations: • Oracle • MS SQL Server • PostgreSQL • Informix • MySQL

  7. MySQL (ver. 5.1)‏ • Maintained by MySQL AB • AB stands for Aktiebolag, German for “Stock Company” (like Inc.)‏

  8. MySQL (ver. 5.1)‏ • Maintained by MySQL AB • AB stands for Aktiebolag, German for “Stock Company” (like Inc.)‏ • Named after co-developer Monty Widenius' daughter, My

  9. MySQL (ver. 5.1)‏ • Maintained by MySQL AB • AB stands for Aktiebolag, German for “Stock Company” (like Inc.)‏ • Named after co-developer Monty Widenius' daughter, My • Started as an mSQL extension, but developers decided it wasn't fast enough

  10. Why use mySQL? • Stability • Web Applications – for many reads and few writes • Open Source • Low Overhead – Can run on machines using less than 32 MB of RAM • Large Table Size – can store up to 8 TB per table (limited by computer file sizes before it reaches this limit)‏

  11. API • Application Programming Interfaces • Support for multiple threads • Multiple languages available • C • C++ • JDBC/Java • Perl • PHP • And more...

  12. API for C • Most Common • Most Developed • Installing this API • http://dev.mysql.com/doc/refman/5.1/en/apis.html • C API statements will return 0 on successful execution

  13. Basic Structure for C API Programs 1. #include <mysql/mysql.h> 2. Define MYSQL variable 3. mysql_init(); 4. mysql_options(); // optionally set options 5. mysql_real_connect(); // connect to the database 6. Program statements 7. mysql_close()‏

  14. Structure for mySQL statements • Functions used to emulate SQL statements • All standard SQL statements are valid, with extensions • Standard SQL statements are capitalized • MySQL extensions are lower-case • For the following slides: • <statement> - statement • [<statement>] - optional statement • (<statement>) - 1 or more times

  15. Creating a Database • CREATE DATABASE [if not exists] <DBName> • mysql_create_db(&mysql, “DBName”)‏

  16. Creating a Table • CREATE [temporary] TABLE [if not exists] <TableName> [(<column definition>, ...)] [<table options>][<select statement>]

  17. Inserting Data • INSERT [low-priority | delayed] [ignore] [into] <tablename> [(<columnname>, ...)] VALUES (<insert expression>,)‏

  18. Other commands • Strmov(query_def, "SELECT Name,EMail FROM Registration WHERE MembershipType='TasteMODE'"); • if(mysql_exec_sql(&mysql,record)==0)‏ { /*on successful statement, execute code here*/ }

  19. Tools • MyAccess – can access MySQL databases • msql2mysql – converts mSQL databases to mySQL

  20. References • MySQL Bible – pdf available at • http://gestalt.twbbs.org/doc_tmp/e-book/MySQL_Bible.pdf • MySQL 5.1 Reference Manual, • available online at http://dev.mysql.com/doc/refman/5.1/en/index.html • C API Examples - http://www.geocities.com/jahan.geo/mysql_c_by_example.html#CheckingClientLibraryVersion

  21. Questions • 1. Where can you download and install the API for the C language? • 2. What is the function that can be called to access the database?

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