+++ /dev/null
-
-(in-package :cl-user)
-
-;; You must set these variables to appropriate values.
-(defvar *tutorial-database-type* nil
- "Possible values are :postgresql,:postgresql-socket :mysql or :sqlite")
-(defvar *tutorial-database-name* ""
- "The name of the database we will work in.")
-(defvar *tutorial-database-user* ""
- "The name of the database user we will work as.")
-(defvar *tutorial-database-server* ""
- "The name of the database server if required")
-(defvar *tutorial-database-password* ""
- "The password if required")
-
-(sql:def-view-class employee ()
- ((emplid
- :db-kind :key
- :db-constraints :not-null
- :nulls-ok nil
- :type integer
- :initarg :emplid)
- (first-name
- :accessor first-name
- :type (string 30)
- :initarg :first-name)
- (last-name
- :accessor last-name
- :type (string 30)
- :initarg :last-name)
- (email
- :accessor employee-email
- :type (string 100)
- :nulls-ok t
- :initarg :email)
- (companyid
- :type integer)
- (company
- :accessor employee-company
- :db-kind :join
- :db-info (:join-class company
- :home-key companyid
- :foreign-key companyid
- :set nil))
- (managerid
- :type integer
- :nulls-ok t)
- (manager
- :accessor employee-manager
- :db-kind :join
- :db-info (:join-class employee
- :home-key managerid
- :foreign-key emplid
- :set nil)))
- (:base-table employee))
-
-(sql:def-view-class company ()
- ((companyid
- :db-type :key
- :db-constraints :not-null
- :type integer
- :initarg :companyid)
- (name
- :type (string 100)
- :initarg :name)
- (presidentid
- :type integer)
- (president
- :reader president
- :db-kind :join
- :db-info (:join-class employee
- :home-key presidentid
- :foreign-key emplid
- :set nil))
- (employees
- :reader company-employees
- :db-kind :join
- :db-info (:join-class employee
- :home-key companyid
- :foreign-key companyid
- :set t)))
- (:base-table company))
-
-;; Connect to the database (see the CLSQL documentation for vendor
-;; specific connection specs).
-(sql:connect `(,*tutorial-database-server*
- ,*tutorial-database-name*
- ,*tutorial-database-user*
- ,*tutorial-database-password*)
- :database-type *tutorial-database-type*)
-
-;; Record the sql going out, helps us learn what is going
-;; on behind the scenes
-(sql:start-sql-recording)
-
-;; Create the tables for our view classes
-;; First we drop them, ignoring any errors
-(ignore-errors
- (sql:drop-view-from-class 'employee)
- (sql:drop-view-from-class 'company))
-
-(sql:create-view-from-class 'employee)
-(sql:create-view-from-class 'company)
-
-
-;; Create some instances of our view classes
-(defvar employee1 (make-instance 'employee
- :emplid 1
- :first-name "Vladamir"
- :last-name "Lenin"
- :email "lenin@soviet.org"))
-
-(defvar company1 (make-instance 'company
- :companyid 1
- :name "Widgets Inc."))
-
-
-(defvar employee2 (make-instance 'employee
- :emplid 2
- :first-name "Josef"
- :last-name "Stalin"
- :email "stalin@soviet.org"))
-
-;; Lenin manages Stalin (for now)
-(sql:add-to-relation employee2 'manager employee1)
-
-;; Lenin and Stalin both work for Widgets Inc.
-(sql:add-to-relation company1 'employees employee1)
-(sql:add-to-relation company1 'employees employee2)
-
-;; Lenin is president of Widgets Inc.
-(sql:add-to-relation company1 'president employee1)
-
-(sql:update-records-from-instance employee1)
-(sql:update-records-from-instance employee2)
-(sql:update-records-from-instance company1)
-
-;; lets us use the functional
-;; sql interface
-(sql:locally-enable-sql-reader-syntax)
-
-
-(format t "The email address of ~A ~A is ~A"
- (first-name employee1)
- (last-name employee1)
- (employee-email employee1))
-
-(setf (employee-email employee1) "lenin-nospam@soviets.org")
-
-;; Update the database
-(sql:update-records-from-instance employee1)
-
-(let ((new-lenin (car
- (sql:select 'employee
- :where [= [slot-value 'employee 'emplid] 1]))))
- (format t "His new email is ~A"
- (employee-email new-lenin)))
-
-
-;; Some queries
-
-;; all employees
-(sql:select 'employee)
-;; all companies
-(sql:select 'company)
-
-;; employees named Lenin
-(sql:select 'employee :where [= [slot-value 'employee 'last-name]
- "Lenin"])
-
-(sql:select 'company :where [= [slot-value 'company 'name]
- "Widgets Inc."])
-
-;; Employees of Widget's Inc.
-(sql:select 'employee
- :where [and [= [slot-value 'employee 'companyid]
- [slot-value 'company 'companyid]]
- [= [slot-value 'company 'name]
- "Widgets Inc."]])
-
-;; Same thing, except that we are using the employee
-;; relation in the company view class to do the join for us,
-;; saving us the work of writing out the SQL!
-(company-employees company1)
-
-;; President of Widgets Inc.
-(president company1)
-
-;; Manager of Josef Stalin
-(employee-manager employee2)
projects / clsql.git / blobdiff