+(defmethod auto-increment-sequence-name (table column (database generic-postgresql-database))
+ (let* ((sequence-name (or (database-identifier (slot-value column 'autoincrement-sequence))
+ (combine-database-identifiers
+ (list table column 'seq)
+ database))))
+ (when (search "'" (escaped-database-identifier sequence-name)
+ :test #'string-equal)
+ (signal-database-too-strange
+ "PG Sequence names shouldnt contain single quotes for the sake of sanity"))
+ sequence-name))
+
+(defmethod database-last-auto-increment-id ((database generic-postgresql-database) table column)
+ (let ((seq-name (auto-increment-sequence-name table column database)))
+ (first (clsql:query (format nil "SELECT currval ('~a')"
+ (escaped-database-identifier seq-name))
+ :flatp t
+ :database database
+ :result-types '(:int)))))
+
+(defmethod database-generate-column-definition
+ (class slotdef (database generic-postgresql-database))
+ (when (member (view-class-slot-db-kind slotdef) '(:base :key))
+ (let ((cdef
+ (list (sql-expression :attribute (database-identifier slotdef database))
+ (specified-type slotdef)
+ (view-class-slot-db-type slotdef)))
+ (const (listify (view-class-slot-db-constraints slotdef)))
+ (seq (auto-increment-sequence-name class slotdef database)))
+ (when seq
+ (setf const (remove :auto-increment const))
+ (unless (member :default const)
+ (let* ((next (format nil "nextval('~a')" (escaped-database-identifier seq))))
+ (setf const (append const (list :default next))))))
+ (append cdef const))))
+
+(defmethod database-add-autoincrement-sequence
+ ((self standard-db-class) (database generic-postgresql-database))
+ (let ((ordered-slots (slots-for-possibly-normalized-class self)))
+ (dolist (slotdef ordered-slots)
+ ;; ensure that referenceed sequences actually exist before referencing them
+ (let ((sequence-name (auto-increment-sequence-name self slotdef database)))
+ (when (and sequence-name
+ (not (sequence-exists-p sequence-name :database database)))
+ (create-sequence sequence-name :database database))))))
+
+(defmethod database-remove-autoincrement-sequence
+ ((table standard-db-class)
+ (database generic-postgresql-database))
+ (let ((ordered-slots (slots-for-possibly-normalized-class table)))
+ (dolist (slotdef ordered-slots)
+ ;; ensure that referenceed sequences are dropped with the table
+ (let ((sequence-name (auto-increment-sequence-name table slotdef database)))
+ (when sequence-name (drop-sequence sequence-name))))))
+