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jpobeda
6423aad2ac
Spelling mistakes/typos Small addition to Standard-Documentation Merged @cigamit DevelopmentStandards wiki page to Standards-Code-Formatting as Overview. And whatever I forgot to mention :)
35 lines
967 B
Markdown
35 lines
967 B
Markdown
# SQL Standards
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Special care must be taken for Cacti to properly support multiple DBMS's.
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## Quotes
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When writing queries do not use quotes around numeric values. While MySQL is
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not strict about types, most DBMS's assume that any value contained within
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quotes is a string.
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As well, single quotes are used unless a variable is referenced
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```php
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$graphs = db_fetch_assoc('SELECT * FROM graph WHERE height >= 150');
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```
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```php
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$rows = db_fetch_cell("SELECT count(*) FROM $archive_table");
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```
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## SQL Functions
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Do not use functions in SQL queries that are provided by the DBMS. These
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functions are generally not uniformly support or even available in all DBMS's.
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Common examples of such functions are `MD5()`, `CONCAT()`, and `NOW()`.
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## Database Abstraction
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Always use the database libraries provided by Cacti as an extra layer between
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the code and ADODB. Details about these functions are located in
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`lib/sys/database.php`.
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---
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Copyright (c) 2018 Cacti Group
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