function DateSqlHandler::sql_extract in Date 8

Helper function to create cross-database SQL date extraction.

Parameters

string $extract_type: The type of value to extract from the date, like 'MONTH'.

string $field: The real table and field name, like 'tablename.fieldname'.

Return value

string An appropriate SQL string for the db type and field type.

1 call to DateSqlHandler::sql_extract()

DateSqlHandler::sql_where_extract in date_api/lib/Drupal/date_api/DateSqlHandler.php

Creates a where clause comparing an extracted date part to an integer.

File

date_api/lib/Drupal/date_api/DateSqlHandler.php, line 466

Class

DateSqlHandler

A class to manipulate date SQL.

Namespace

Drupal\date_api

Code

function sql_extract($extract_type, $field) {

  // Note there is no space after FROM to avoid db_rewrite problems
  // see http://drupal.org/node/79904.
  switch (strtoupper($extract_type)) {
    case 'DATE':
      return $field;
    case 'YEAR':
      return "EXTRACT(YEAR FROM({$field}))";
    case 'MONTH':
      return "EXTRACT(MONTH FROM({$field}))";
    case 'DAY':
      return "EXTRACT(DAY FROM({$field}))";
    case 'HOUR':
      return "EXTRACT(HOUR FROM({$field}))";
    case 'MINUTE':
      return "EXTRACT(MINUTE FROM({$field}))";
    case 'SECOND':
      return "EXTRACT(SECOND FROM({$field}))";

    // ISO week number for date.
    case 'WEEK':
      switch ($this->db_type) {
        case 'mysql':
        case 'mysqli':

          // WEEK using arg 3 in MySQl should return the same value as
          // Postgres EXTRACT.
          return "WEEK({$field}, 3)";
        case 'pgsql':
          return "EXTRACT(WEEK FROM({$field}))";
      }
    case 'DOW':
      switch ($this->db_type) {
        case 'mysql':
        case 'mysqli':

          // MySQL returns 1 for Sunday through 7 for Saturday, PHP date
          // functions and Postgres use 0 for Sunday and 6 for Saturday.
          return "INTEGER(DAYOFWEEK({$field}) - 1)";
        case 'pgsql':
          return "EXTRACT(DOW FROM({$field}))";
      }
    case 'DOY':
      switch ($this->db_type) {
        case 'mysql':
        case 'mysqli':
          return "DAYOFYEAR({$field})";
        case 'pgsql':
          return "EXTRACT(DOY FROM({$field}))";
      }
  }
}