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SQL Guidelines

Table names

  1. Table names must begin with the PrestaShop "_DB_PREFIX_" prefix.

    ... FROM `'. _DB_PREFIX_.'customer` ...
  2. Table names must have the same name as the object they reflect: "ps_cart".
  3. Table names have to stay singular: "ps_order".
  4. Language data have to be stored in a table named exactly like the object's table, and with the "_lang" suffix: "ps_product_lang".

SQL query

  1. Keywords must be written in uppercase.

    SELECT `firstname`
    FROM `'._DB_PREFIX_.'customer`
  2. Back quotes ("`") must be used around SQL field names and table names.

    SELECT p.`foo`, c.`bar`
    FROM `'._DB_PREFIX_.'product` p, `'._DB_PREFIX_.'customer` c
  3. Table aliases have to be named by taking the first letter of each word, and must be lowercase.

    SELECT p.`id_product`, pl.`name`
    FROM `'._DB_PREFIX_.'product` p
    NATURAL JOIN `'._DB_PREFIX_.'product_lang` pl
  4. When conflicts between table aliases occur, the second character has to be also used in the name.

    SELECT ca.`id_product`, cu.`firstname`
    FROM `'._DB_PREFIX_.'cart` ca, `'._DB_PREFIX_.'customer` cu
  5. A new line has to be created for each clause.

    $query = 'SELECT pl.`name`
    FROM `'._DB_PREFIX_.'product_lang` pl
    WHERE pl.`id_product` = 17';
  6. It is forbidden to make a JOIN in a WHERE clause.
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