+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;;
+;;;; $Id$
+;;;;
+;;;; Generic postgresql layer, used by db-postgresql and db-postgresql-socket
+;;;;
+;;;; This file is part of CLSQL.
+;;;;
+;;;; CLSQL users are granted the rights to distribute and use this software
+;;;; as governed by the terms of the Lisp Lesser GNU Public License
+;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
+;;;; *************************************************************************
+
+(in-package #:clsql-sys)
+
+(defclass generic-postgresql-database (database)
+ ()
+ (:documentation "Encapsulate same behavior across postgresql and postgresql-socket backends."))
+
+
+
+;; Object functions
+
+(defmethod database-get-type-specifier (type args database
+ (db-type (eql :postgresql)))
+ (declare (ignore type args database))
+ "VARCHAR")
+
+(defmethod database-get-type-specifier ((type (eql 'simple-base-string)) args database
+ (db-type (eql :postgresql)))
+ (declare (ignore database))
+ (if args
+ (format nil "VARCHAR(~A)" (car args))
+ "VARCHAR"))
+
+(defmethod database-get-type-specifier ((type (eql 'simple-string)) args database
+ (db-type (eql :postgresql)))
+ (declare (ignore database))
+ (if args
+ (format nil "VARCHAR(~A)" (car args))
+ "VARCHAR"))
+
+(defmethod database-get-type-specifier ((type (eql 'string)) args database
+ (db-type (eql :postgresql)))
+ (declare (ignore database))
+ (if args
+ (format nil "VARCHAR(~A)" (car args))
+ "VARCHAR"))
+
+(defmethod database-get-type-specifier ((type (eql 'wall-time)) args database
+ (db-type (eql :postgresql)))
+ (declare (ignore args database))
+ "TIMESTAMP WITHOUT TIME ZONE")
+
+
+;;; Backend functions
+
+(defun owner-clause (owner)
+ (cond
+ ((stringp owner)
+ (format
+ nil
+ " AND (relowner=(SELECT usesysid FROM pg_user WHERE (usename='~A')))"
+ owner))
+ ((null owner)
+ (format nil " AND (NOT (relowner=1))"))
+ (t "")))
+
+(defun database-list-objects-of-type (database type owner)
+ (mapcar #'car
+ (database-query
+ (format nil
+ "SELECT relname FROM pg_class WHERE (relkind = '~A')~A"
+ type
+ (owner-clause owner))
+ database nil nil)))
+
+(defmethod database-list-tables ((database generic-postgresql-database)
+ &key (owner nil))
+ (database-list-objects-of-type database "r" owner))
+
+(defmethod database-list-views ((database generic-postgresql-database)
+ &key (owner nil))
+ (database-list-objects-of-type database "v" owner))
+
+(defmethod database-list-indexes ((database generic-postgresql-database)
+ &key (owner nil))
+ (database-list-objects-of-type database "i" owner))
+
+
+(defmethod database-list-table-indexes (table (database generic-postgresql-database)
+ &key (owner nil))
+ (let ((indexrelids
+ (database-query
+ (format
+ nil
+ "select indexrelid from pg_index where indrelid=(select relfilenode from pg_class where relname='~A'~A)"
+ (string-downcase table)
+ (owner-clause owner))
+ database :auto nil))
+ (result nil))
+ (dolist (indexrelid indexrelids (nreverse result))
+ (push
+ (caar (database-query
+ (format nil "select relname from pg_class where relfilenode='~A'"
+ (car indexrelid))
+ database nil nil))
+ result))))
+
+(defmethod database-list-attributes ((table string)
+ (database generic-postgresql-database)
+ &key (owner nil))
+ (let* ((owner-clause
+ (cond ((stringp owner)
+ (format nil " AND (relowner=(SELECT usesysid FROM pg_user WHERE usename='~A'))" owner))
+ ((null owner) " AND (not (relowner=1))")
+ (t "")))
+ (result
+ (mapcar #'car
+ (database-query
+ (format nil "SELECT attname FROM pg_class,pg_attribute WHERE pg_class.oid=attrelid AND relname='~A'~A"
+ (string-downcase table)
+ owner-clause)
+ database nil nil))))
+ (if result
+ (remove-if #'(lambda (it) (member it '("cmin"
+ "cmax"
+ "xmax"
+ "xmin"
+ "oid"
+ "ctid"
+ ;; kmr -- added tableoid
+ "tableoid") :test #'equal))
+ result))))
+
+(defmethod database-attribute-type (attribute (table string)
+ (database generic-postgresql-database)
+ &key (owner nil))
+ (let ((row (car (database-query
+ (format nil "SELECT pg_type.typname,pg_attribute.attlen,pg_attribute.atttypmod,pg_attribute.attnotnull FROM pg_type,pg_class,pg_attribute WHERE pg_class.oid=pg_attribute.attrelid AND pg_class.relname='~A' AND pg_attribute.attname='~A' AND pg_attribute.atttypid=pg_type.oid~A"
+ (string-downcase table)
+ (string-downcase attribute)
+ (owner-clause owner))
+ database nil nil))))
+ (when row
+ (values
+ (ensure-keyword (first row))
+ (if (string= "-1" (second row))
+ (- (parse-integer (third row) :junk-allowed t) 4)
+ (parse-integer (second row)))
+ nil
+ (if (string-equal "f" (fourth row))
+ 1
+ 0)))))
+
+(defmethod database-create-sequence (sequence-name
+ (database generic-postgresql-database))
+ (database-execute-command
+ (concatenate 'string "CREATE SEQUENCE " (sql-escape sequence-name))
+ database))
+
+(defmethod database-drop-sequence (sequence-name
+ (database generic-postgresql-database))
+ (database-execute-command
+ (concatenate 'string "DROP SEQUENCE " (sql-escape sequence-name)) database))
+
+(defmethod database-list-sequences ((database generic-postgresql-database)
+ &key (owner nil))
+ (database-list-objects-of-type database "S" owner))
+
+(defmethod database-set-sequence-position (name (position integer)
+ (database generic-postgresql-database))
+ (values
+ (parse-integer
+ (caar
+ (database-query
+ (format nil "SELECT SETVAL ('~A', ~A)" name position)
+ database nil nil)))))
+
+(defmethod database-sequence-next (sequence-name
+ (database generic-postgresql-database))
+ (values
+ (parse-integer
+ (caar
+ (database-query
+ (concatenate 'string "SELECT NEXTVAL ('" (sql-escape sequence-name) "')")
+ database nil nil)))))
+
+(defmethod database-sequence-last (sequence-name (database generic-postgresql-database))
+ (values
+ (parse-integer
+ (caar
+ (database-query
+ (concatenate 'string "SELECT LAST_VALUE ('" sequence-name "')")
+ database nil nil)))))
+
+(defun postgresql-database-list (connection-spec type)
+ (destructuring-bind (host name user password) connection-spec
+ (declare (ignore name))
+ (let ((database (database-connect (list host "template1" user password)
+ type)))
+ (unwind-protect
+ (progn
+ (setf (slot-value database 'clsql-sys::state) :open)
+ (mapcar #'car (database-query "select datname from pg_database"
+ database nil nil)))
+ (progn
+ (database-disconnect database)
+ (setf (slot-value database 'clsql-sys::state) :closed))))))
+
+(defmethod database-list (connection-spec (type (eql :postgresql)))
+ (postgresql-database-list connection-spec type))
+
+(defmethod database-list (connection-spec (type (eql :postgresql-socket)))
+ (postgresql-database-list connection-spec type))
+
+
+(defmethod database-describe-table ((database generic-postgresql-database) table)
+ (database-query
+ (format nil "select a.attname, t.typname
+ from pg_class c, pg_attribute a, pg_type t
+ where c.relname = '~a'
+ and a.attnum > 0
+ and a.attrelid = c.oid
+ and a.atttypid = t.oid"
+ (sql-escape (string-downcase table)))
+ database :auto nil))
+
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