public function date_sql_handler::sql_extract in Date 7.3

Same name and namespace in other branches

1. 5.2 date_api_sql.inc \date_sql_handler::sql_extract()
2. 6.2 date_api_sql.inc \date_sql_handler::sql_extract()
3. 6 date_api_sql.inc \date_sql_handler::sql_extract()
4. 7 date_api/date_api_sql.inc \date_sql_handler::sql_extract()
5. 7.2 date_api/date_api_sql.inc \date_sql_handler::sql_extract()

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 date_sql_handler::sql_extract()

date_sql_handler::sql_where_extract in date_api/date_api_sql.inc

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

File

date_api/date_api_sql.inc, line 574

SQL helper for Date API.

Class

date_sql_handler

A class to manipulate date SQL.

Code

public 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':

          // 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':

          // 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 ($this->db_type) {
        case 'mysql':
          return "DAYOFYEAR({$field})";
        case 'pgsql':
          return "EXTRACT(DOY FROM({$field}))";
      }
  }
}