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ae8800d8d3
- 'ps_10nestset' uses a "nested set" approach for an employee hierarchy, then does arithmetic on the "salary" field; (soon) to be extended by inserts / deletes which imply mass updates on the "l"/"r" fields showing the set inclusion, - 'ps_11bugs' will get (some of ?) those bug DB entries which refer to prepared statements, but whose number does not appear in a test file comment - so it will also be extended.
63 lines
2.5 KiB
Text
63 lines
2.5 KiB
Text
###############################################
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# #
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# Prepared Statements test on #
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# "nested sets" representing hierarchies #
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# #
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###############################################
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# Source: http://kris.koehntopp.de/artikel/sql-self-references (dated 1999)
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# Source: http://dbmsmag.com/9603d06.html (dated 1996)
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use test;
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drop table if exists personnel;
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# "Nested Set": This table represents an employee list with a hierarchy tree.
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# The tree is not modeled by "parent" links but rather by showing the "left"
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# and "right" border of any person's "region". By convention, "l" < "r".
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# As it is a tree, these "regions" of two persons A and B are either disjoint,
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# or A's region is completely contained in B's (B is A's boss), or vice versa.
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# See the references for more info.
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create table personnel (
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id INTEGER AUTO_INCREMENT PRIMARY KEY,
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emp CHAR(10) NOT NULL,
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salary DECIMAL(6,2) NOT NULL,
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l INTEGER NOT NULL,
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r INTEGER NOT NULL);
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prepare st_ins from 'insert into personnel set emp = ?, salary = ?, l = ?, r = ?';
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# Initial employee list:
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# Jerry ( Bert ( ) Chuck ( Donna ( ) Eddie ( ) Fred ( ) ) )
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set @arg_nam= 'Jerry'; set @arg_sal= 1000; set @arg_l= 1; set @arg_r= 12;
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execute st_ins using @arg_nam, @arg_sal, @arg_l, @arg_r ;
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set @arg_nam= 'Bert'; set @arg_sal= 900; set @arg_l= 2; set @arg_r= 3;
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execute st_ins using @arg_nam, @arg_sal, @arg_l, @arg_r ;
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set @arg_nam= 'Chuck'; set @arg_sal= 900; set @arg_l= 4; set @arg_r= 11;
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execute st_ins using @arg_nam, @arg_sal, @arg_l, @arg_r ;
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set @arg_nam= 'Donna'; set @arg_sal= 800; set @arg_l= 5; set @arg_r= 6;
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execute st_ins using @arg_nam, @arg_sal, @arg_l, @arg_r ;
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set @arg_nam= 'Eddie'; set @arg_sal= 700; set @arg_l= 7; set @arg_r= 8;
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execute st_ins using @arg_nam, @arg_sal, @arg_l, @arg_r ;
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set @arg_nam= 'Fred'; set @arg_sal= 600; set @arg_l= 9; set @arg_r= 10;
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execute st_ins using @arg_nam, @arg_sal, @arg_l, @arg_r ;
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select * from personnel;
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# Three successive raises, each one is 100 units for managers, 10 percent for others.
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prepare st_raise_base from 'update personnel set salary = salary * ( 1 + ? ) where r - l = 1';
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prepare st_raise_mgr from 'update personnel set salary = salary + ? where r - l > 1';
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let $1= 3;
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set @arg_percent= .10;
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set @arg_amount= 100;
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while ($1)
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{
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execute st_raise_base using @arg_percent;
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execute st_raise_mgr using @arg_amount;
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dec $1;
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}
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select * from personnel;
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drop table personnel;
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