+(defmethod database-query (query-expression (database mysql-database)
+ result-types field-names)
+ (declare (optimize (speed 3) (safety 0) (debug 0) (space 0)))
+ (let ((mysql-ptr (database-mysql-ptr database)))
+ (declare (type mysql-mysql-ptr-def mysql-ptr))
+ (when (database-execute-command query-expression database)
+ (let ((res-ptr (mysql-use-result mysql-ptr)))
+ (declare (type mysql-mysql-res-ptr-def res-ptr))
+ (if (and res-ptr (not (uffi:null-pointer-p res-ptr)))
+ (unwind-protect
+ (let ((num-fields (mysql-num-fields res-ptr)))
+ (declare (fixnum num-fields))
+ (setq result-types (canonicalize-types
+ result-types res-ptr))
+ (values
+ (loop for row = (mysql-fetch-row res-ptr)
+ for lengths = (mysql-fetch-lengths res-ptr)
+ until (uffi:null-pointer-p row)
+ collect
+ (do* ((rlist (make-list num-fields))
+ (i 0 (1+ i))
+ (pos rlist (cdr pos)))
+ ((= i num-fields) rlist)
+ (declare (fixnum i))
+ (setf (car pos)
+ (convert-raw-field
+ (uffi:deref-array row '(:array
+ (* :unsigned-char))
+ i)
+ (nth i result-types)
+ :length
+ (uffi:deref-array lengths '(:array :unsigned-long) i)
+ :encoding (encoding database)))))
+ (when field-names
+ (result-field-names res-ptr))))
+ (mysql-free-result res-ptr))
+ (unless (zerop (mysql-errno mysql-ptr))
+ ;;from http://dev.mysql.com/doc/refman/5.0/en/mysql-field-count.html
+ ;; if mysql_use_result or mysql_store_result return a null ptr,
+ ;; we use a mysql_errno check to see if it had a problem or just
+ ;; was a query without a result. If no error, just return nil.
+ (error 'sql-database-data-error
+ :database database
+ :expression query-expression
+ :error-id (mysql-errno mysql-ptr)
+ :message (mysql-error-string mysql-ptr))))))))
+
+