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All these codes test on oracle9.2.First,give the all the base tables and datas for learning pl/sql.
They will be all used in the following testing.
create sequence student_sequence start with 10000 increment by 1; create sequence room_sequence start with 20000 increment by 1; create table students( id number(5) primary key, first_name varchar2(20), last_name varchar2(20), major varchar2(30), current_credits number(3) ); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Scott','Smith','Computer Science',11); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Margaret','Mason','History',4); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Joanne','Junebug','Computer Science',8); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Manish','Murgratroid','Economics',8); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Patrick','Poll','History',4); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Timothy','Taller','History',4); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Barbara','Blues','Economics',7); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'David','Dinsmore','Music',4); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Ester','Elegant','Nutrition',8); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Rose','Riznit','Music',7); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Rita','Razmataz','Nutrition',8); insert into students(id,first_name,last_name,major,current_credits) values(student_sequence.nextval,'Shay','Shariatpanahy','Computer Science',3); create table major_stats( major varchar2(30), total_credits number, total_students number ) insert into major_stats(major,total_credits,total_students) values('Computer Science',22,3); insert into major_stats(major,total_credits,total_students) values('History',12,3); insert into major_stats(major,total_credits,total_students) values('Economics',15,2); insert into major_stats(major,total_credits,total_students) values('Music',11,2); insert into major_stats(major,total_credits,total_students) values('Nutrition',16,2); create table rooms( room_id number(5) primary key, building varchar2(15), room_number number(4), number_seats number(4), description varchar2(50) ); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 7',201,1000,'Large Lecture Hall'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 6',101,500,'Small Lecture Hall'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 6',150,50,'Discussion Room A'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 6',160,50,'Discussion Room B'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 6',170,50,'Discussion Room C'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Music Building',100,10,'Music Practise Room'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Music Building',200,1000,'Concert Room'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 7',300,75,'Discussion Room D'); insert into rooms(room_id,building,room_number,number_seats,description) values(room_sequence.nextval,'Building 7',310,50,'Discussion Room E'); create table classes( department char(3), course number(3), description varchar2(2000), max_students number(3), current_students number(3), num_credits number(1), room_id number(5), constraint classes_department_course primary key (department,course), constraint classes_room_id foreign key (room_id) references rooms(room_id) ); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('HIS',101,'History 101',30,11,4,20000); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('HIS',301,'History 301',30,0,4,20004); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('CS',101,'Computer Science 101',50,0,4,20001); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('ESN',203,'Economics 203',15,0,3,20002); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('CS',102,'Computer Science 102',35,3,4,20003); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('MUS',410,'Music 410',5,4,3,20005); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('ECN',101,'Economics 101',50,0,4,20007); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('NUT',307,'Nutrition 307',20,2,4,20008); insert into classes(department,course,description,max_students,current_students,num_credits,room_id) values('NUS',100,'Music 100',100,0,3,null); create table registered_students( student_id number(5) not null, department char(3) not null, course number(3) not null, grade char(1), constraint rs_grade check(grade in('A','B','C','D','E')), constraint rs_student_di foreign key (student_id) references students(id), constraint rs_department_course foreign key(department,course) references classes(department,course) ); insert into registered_students(student_id,department,course,grade) values(10000,'CS',102,'A'); insert into registered_students(student_id,department,course,grade) values(10002,'CS',102,'B'); insert into registered_students(student_id,department,course,grade) values(10003,'CS',102,'C'); insert into registered_students(student_id,department,course,grade) values(10000,'HIS',101,'A'); insert into registered_students(student_id,department,course,grade) values(10001,'HIS',101,'B'); insert into registered_students(student_id,department,course,grade) values(10002,'HIS',101,'B'); insert into registered_students(student_id,department,course,grade) values(10003,'HIS',101,'A'); insert into registered_students(student_id,department,course,grade) values(10004,'HIS',101,'C'); insert into registered_students(student_id,department,course,grade) values(10005,'HIS',101,'C'); insert into registered_students(student_id,department,course,grade) values(10006,'HIS',101,'E'); insert into registered_students(student_id,department,course,grade) values(10007,'HIS',101,'B'); insert into registered_students(student_id,department,course,grade) values(10008,'HIS',101,'A'); insert into registered_students(student_id,department,course,grade) values(10009,'HIS',101,'D'); insert into registered_students(student_id,department,course,grade) values(10010,'HIS',101,'A'); insert into registered_students(student_id,department,course,grade) values(10008,'NUT',307,'A'); insert into registered_students(student_id,department,course,grade) values(10010,'NUT',307,'A'); insert into registered_students(student_id,department,course,grade) values(10009,'MUS',410,'B'); insert into registered_students(student_id,department,course,grade) values(10006,'MUS',410,'E'); insert into registered_students(student_id,department,course,grade) values(10011,'MUS',410,'B'); insert into registered_students(student_id,department,course,grade) values(10010,'MUS',410,'B'); create table rs_audit( change_type char(1) not null, changed_by varchar2(8) not null, timestamp date not null, old_student_id number(5), old_department char(3), old_course number(3), old_grade char(1), new_student_id number(5), new_department char(3), new_course number(3), new_grade char(1) ); create table log_table( code number, message varchar2(200), info varchar2(100) ); create table temp_table( num_col number, char_col varchar2(60) ); create table connect_audit( user_name varchar2(30), operation varchar2(30), timestamp date ); create table debug_table( linecount number, debug_str varchar2(100) ); create table source( key number(5), value varchar2(50) ); create table destination( key number(5), value number );
Then to create the function and procdure to show how to debug when the error raised up.
create or replace function AverageGrade( p_Department in registered_students.department%TYPE, p_Course in registered_students.course%TYPE) return char as v_AverageGrade char(1); v_NumericGrade number; v_NumberStudents number; --cursor c_Grades is --select grade from registered_students --where department = p_Department and course = p_Course; begin Debug.Reset; Debug.Debug('p_Department',''''||p_Department||''''); Debug.Debug('p_Course',''''||p_Course||''''); --Check the number of student that queried. select count(*) into v_NumberStudents from registered_students where department = p_Department and course = p_Course; Debug.Debug('After select,the number is: ',v_NumberStudents); if v_NumberStudents = 0 then raise_application_error(-20001,'No students registered for '||p_Department||' '||p_Course); end if; select avg(decode(grade,'A',5,'B',4,'C',3,'D',2,'E',1)) into v_NumericGrade from registered_students where department = p_Department and course = p_Course; select decode(round(v_NumericGrade),5,'A',4,'B',3,'C',2,'D',1,'E') into v_AverageGrade from dual; return v_AverageGrade; end AverageGrade; create or replace package Debug as --select debug_str from debug_table order by linecount; procedure Debug(p_Description in varchar2,p_Value in varchar2); procedure Reset; end Debug; create or replace package body Debug as v_LineCount number; --procedure debug procedure Debug(p_Description in varchar2,p_Value in varchar2) is begin insert into debug_table(linecount,debug_str) values(v_LineCount,p_Description||':'||p_Value); commit; v_LineCount := v_LineCount+1; end Debug; --procedure reset procedure Reset is begin v_LineCount:=1; delete from debug_table; end Reset; begin reset; end Debug;
Then we can execute this function to test,the log will be show when:
select * from debug_table
This mode donesnot good enough for us,it may caused some errors.Use "dbms_output.put_line" is a better way .
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