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== SQL ==
== SQL ==
All SQL language identifiers are written in CAPS, and all user-defined identifiers in `backticks`. Inner joins are coded as JOIN and not as WHERE condition. All variable values inserted into SQLs '''must''' be escaped, either via &1 &2 &3 placeholders or via function <code>sql_escape()</code>.
See also: [[Entwicklung/Codedoku#Datenbank]]


SQL statements embedded in PHP code are generally formatted like this:
All SQL language elements are written in CAPS, and all user-defined identifiers in `backticks`. Inner joins are coded as JOIN and not as WHERE. All variable values inserted into SQLs '''must''' be escaped, either via placeholders like <code>'&1'</code> or via function <code>sql_escape()</code>.
 
SQL code inserted into PHP code is enclosed in double quotes and generally formatted like this:


     $result = sql(
     $result = sql(
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         FROM `caches`
         FROM `caches`
         JOIN `cache_logs` ON `cache_logs`.`id` = `caches`.`id`
         JOIN `cache_logs` ON `cache_logs`.`id` = `caches`.`id`
         WHERE `caches`.`staatus` IN ('&1', '&2')"
         WHERE `caches`.`status` IN ('&1', '&2')"
         $status1,
         $status1,
         $status2
         $status2
    );
Note that the starting " is on a tab position, while the following lines start one column to the right.
If lines get too long, the parameters are moved to the next line(s) and indented to the next Tab position (which is ''three'' chars right of the preceding line start):
    $result = sql(
        "SELECT
            `caches`.`cache_id`,
            `caches`.`type` AS `cache_type`,
            `cache_logs`.`date` AS `log_date`,
            `cache_logs`.`type` AS `log_type`,
        FROM `caches`
        JOIN `cache_logs`
            ON `cache_logs`.`id` = `caches`.`id`
            AND `cache_logs`.`type` = '&1'
        WHERE
            `caches`.`status` = '&1'
            AND `cache_logs`.`user_id` = '&2'
        $cacheStatus
        $userId
     );
     );
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