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d5fd452d7c
WL#2265 (RESIGNAL) Manual merge of SIGNAL and RESIGNAL to mysql-trunk-signal, plus required dependencies.
271 lines
6.1 KiB
Plaintext
271 lines
6.1 KiB
Plaintext
drop database if exists demo;
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create database demo;
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use demo;
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create table ab_physical_person (
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person_id integer,
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first_name VARCHAR(50),
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middle_initial CHAR,
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last_name VARCHAR(50),
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primary key (person_id));
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create table ab_moral_person (
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company_id integer,
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name VARCHAR(100),
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primary key (company_id));
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create table in_inventory (
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item_id integer,
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descr VARCHAR(50),
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stock integer,
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primary key (item_id));
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create table po_order (
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po_id integer auto_increment,
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cust_type char, /* arc relationship, see cust_id */
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cust_id integer, /* FK to ab_physical_person *OR* ab_moral_person */
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primary key (po_id));
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create table po_order_line (
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po_id integer, /* FK to po_order.po_id */
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line_no integer,
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item_id integer, /* FK to in_inventory.item_id */
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qty integer);
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#
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# Schema integrity enforcement
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#
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create procedure check_pk_person(in person_type char, in id integer)
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begin
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declare x integer;
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declare msg varchar(128);
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/*
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Test integrity constraints for an 'arc' relationship.
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Based on 'person_type', 'id' points to either a
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physical person, or a moral person.
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*/
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case person_type
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when 'P' then
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begin
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select count(person_id) from ab_physical_person
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where ab_physical_person.person_id = id
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into x;
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if (x != 1)
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then
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set msg= concat('No such physical person, PK:', id);
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SIGNAL SQLSTATE '45000' SET
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MESSAGE_TEXT = msg,
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MYSQL_ERRNO = 10000;
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end if;
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end;
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when 'M' then
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begin
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select count(company_id) from ab_moral_person
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where ab_moral_person.company_id = id
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into x;
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if (x != 1)
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then
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set msg= concat('No such moral person, PK:', id);
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SIGNAL SQLSTATE '45000' SET
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MESSAGE_TEXT = msg,
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MYSQL_ERRNO = 10000;
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end if;
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end;
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else
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begin
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set msg= concat('No such person type:', person_type);
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SIGNAL SQLSTATE '45000' SET
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MESSAGE_TEXT = msg,
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MYSQL_ERRNO = 20000;
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end;
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end case;
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end
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$$
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create procedure check_pk_inventory(in id integer)
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begin
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declare x integer;
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declare msg varchar(128);
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select count(item_id) from in_inventory
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where in_inventory.item_id = id
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into x;
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if (x != 1)
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then
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set msg= concat('Failed integrity constraint, table in_inventory, PK:',
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id);
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SIGNAL SQLSTATE '45000' SET
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MESSAGE_TEXT = msg,
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MYSQL_ERRNO = 10000;
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end if;
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end
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$$
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create procedure check_pk_order(in id integer)
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begin
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declare x integer;
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declare msg varchar(128);
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select count(po_id) from po_order
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where po_order.po_id = id
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into x;
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if (x != 1)
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then
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set msg= concat('Failed integrity constraint, table po_order, PK:', id);
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SIGNAL SQLSTATE '45000' SET
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MESSAGE_TEXT = msg,
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MYSQL_ERRNO = 10000;
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end if;
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end
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$$
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create trigger po_order_bi before insert on po_order
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for each row
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begin
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call check_pk_person(NEW.cust_type, NEW.cust_id);
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end
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$$
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create trigger po_order_bu before update on po_order
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for each row
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begin
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call check_pk_person(NEW.cust_type, NEW.cust_id);
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end
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$$
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create trigger po_order_line_bi before insert on po_order_line
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for each row
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begin
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call check_pk_order(NEW.po_id);
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call check_pk_inventory(NEW.item_id);
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end
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$$
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create trigger po_order_line_bu before update on po_order_line
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for each row
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begin
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call check_pk_order(NEW.po_id);
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call check_pk_inventory(NEW.item_id);
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end
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$$
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#
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# Application helpers
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#
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create procedure po_create_order(
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in p_cust_type char,
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in p_cust_id integer,
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out id integer)
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begin
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insert into po_order set cust_type = p_cust_type, cust_id = p_cust_id;
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set id = last_insert_id();
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end
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$$
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create procedure po_add_order_line(
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in po integer,
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in line integer,
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in item integer,
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in q integer)
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begin
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insert into po_order_line set
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po_id = po, line_no = line, item_id = item, qty = q;
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end
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$$
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#
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# Create sample data
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#
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insert into ab_physical_person values
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( 1, "John", "A", "Doe"),
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( 2, "Marry", "B", "Smith")
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;
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insert into ab_moral_person values
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( 3, "ACME real estate, INC"),
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( 4, "Local school")
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;
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insert into in_inventory values
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( 100, "Table, dinner", 5),
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( 101, "Chair", 20),
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( 200, "Table, coffee", 3),
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( 300, "School table", 25),
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( 301, "School chairs", 50)
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;
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select * from ab_physical_person order by person_id;
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person_id first_name middle_initial last_name
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1 John A Doe
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2 Marry B Smith
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select * from ab_moral_person order by company_id;
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company_id name
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3 ACME real estate, INC
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4 Local school
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select * from in_inventory order by item_id;
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item_id descr stock
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100 Table, dinner 5
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101 Chair 20
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200 Table, coffee 3
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300 School table 25
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301 School chairs 50
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#
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# Entering an order
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#
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set @my_po = 0;
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/* John Doe wants 1 table and 4 chairs */
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call po_create_order("P", 1, @my_po);
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call po_add_order_line (@my_po, 1, 100, 1);
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call po_add_order_line (@my_po, 2, 101, 4);
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/* Marry Smith wants a coffee table */
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call po_create_order("P", 2, @my_po);
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call po_add_order_line (@my_po, 1, 200, 1);
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#
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# Entering bad data in an order
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#
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call po_add_order_line (@my_po, 1, 999, 1);
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ERROR 45000: Failed integrity constraint, table in_inventory, PK:999
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#
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# Entering bad data in an unknown order
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#
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call po_add_order_line (99, 1, 100, 1);
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ERROR 45000: Failed integrity constraint, table po_order, PK:99
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#
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# Entering an order for an unknown company
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#
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call po_create_order("M", 7, @my_po);
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ERROR 45000: No such moral person, PK:7
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#
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# Entering an order for an unknown person type
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#
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call po_create_order("X", 1, @my_po);
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ERROR 45000: No such person type:X
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/* The local school wants 10 class tables and 20 chairs */
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call po_create_order("M", 4, @my_po);
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call po_add_order_line (@my_po, 1, 300, 10);
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call po_add_order_line (@my_po, 2, 301, 20);
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select * from po_order;
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po_id cust_type cust_id
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1 P 1
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2 P 2
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3 M 4
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select * from po_order_line;
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po_id line_no item_id qty
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1 1 100 1
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1 2 101 4
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2 1 200 1
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3 1 300 10
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3 2 301 20
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select po_id as "PO#",
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( case cust_type
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when "P" then concat (pp.first_name,
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" ",
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pp.middle_initial,
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" ",
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pp.last_name)
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when "M" then mp.name
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end ) as "Sold to"
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from po_order po
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left join ab_physical_person pp on po.cust_id = pp.person_id
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left join ab_moral_person mp on po.cust_id = company_id
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;
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PO# Sold to
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1 John A Doe
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2 Marry B Smith
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3 Local school
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select po_id as "PO#",
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ol.line_no as "Line",
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ol.item_id as "Item",
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inv.descr as "Description",
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ol.qty as "Quantity"
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from po_order_line ol, in_inventory inv
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where inv.item_id = ol.item_id
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order by ol.item_id, ol.line_no;
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PO# Line Item Description Quantity
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1 1 100 Table, dinner 1
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1 2 101 Chair 4
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2 1 200 Table, coffee 1
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3 1 300 School table 10
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3 2 301 School chairs 20
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drop database demo;
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