-(defmacro do-query (((&rest args) query-expression
- &key (database '*default-database*) (types nil))
- &body body)
- "Repeatedly executes BODY within a binding of ARGS on the attributes
-of each record resulting from QUERY. The return value is determined by
-the result of executing BODY. The default value of DATABASE is
-*DEFAULT-DATABASE*."
- (let ((result-set (gensym))
- (columns (gensym))
- (row (gensym))
- (db (gensym)))
- `(let ((,db ,database))
- (multiple-value-bind (,result-set ,columns)
- (database-query-result-set ,query-expression ,db
- :full-set nil :types ,types)
- (when ,result-set
- (unwind-protect
- (do ((,row (make-list ,columns)))
- ((not (database-store-next-row ,result-set ,db ,row))
- nil)
- (destructuring-bind ,args ,row
- ,@body))
- (database-dump-result-set ,result-set ,db)))))))
-
-(defun map-query (output-type-spec function query-expression
- &key (database *default-database*)
- (types nil))
- "Map the function over all tuples that are returned by the query in
-query-expression. The results of the function are collected as
-specified in output-type-spec and returned like in MAP."
- (macrolet ((type-specifier-atom (type)
- `(if (atom ,type) ,type (car ,type))))
- (case (type-specifier-atom output-type-spec)
- ((nil)
- (map-query-for-effect function query-expression database types))
- (list
- (map-query-to-list function query-expression database types))
- ((simple-vector simple-string vector string array simple-array
- bit-vector simple-bit-vector base-string
- simple-base-string)
- (map-query-to-simple output-type-spec function query-expression database types))
- (t
- (funcall #'map-query (cmucl-compat:result-type-or-lose output-type-spec t)
- function query-expression :database database :types types)))))
-
-(defun map-query-for-effect (function query-expression database types)
- (multiple-value-bind (result-set columns)
- (database-query-result-set query-expression database :full-set nil
- :types types)
- (when result-set
- (unwind-protect
- (do ((row (make-list columns)))
- ((not (database-store-next-row result-set database row))
- nil)
- (apply function row))
- (database-dump-result-set result-set database)))))
-
-(defun map-query-to-list (function query-expression database types)
- (multiple-value-bind (result-set columns)
- (database-query-result-set query-expression database :full-set nil
- :types types)
- (when result-set
- (unwind-protect
- (let ((result (list nil)))
- (do ((row (make-list columns))
- (current-cons result (cdr current-cons)))
- ((not (database-store-next-row result-set database row))
- (cdr result))
- (rplacd current-cons (list (apply function row)))))
- (database-dump-result-set result-set database)))))
-