94 lines
2.2 KiB
Markdown
94 lines
2.2 KiB
Markdown
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# Database Queries for Assignment-A8
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## Creating tables
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`Library` table:
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```sql
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CREATE TABLE Library(
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id NUMBER(12),
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title VARCHAR(255),
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dateofissue DATE,
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author VARCHAR(255)
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);
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```
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`Library_Audit` table:
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```sql
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CREATE TABLE Library_Audit(
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id NUMBER(12),
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title VARCHAR(255),
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dateofaction DATE,
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author VARCHAR(255),
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status VARCHAR(255)
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);
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```
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## Inserting values
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`Library` table:
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```sql
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INSERT INTO Library VALUES (1, 'Berserk', TO_DATE('2024-07-28','YYYY-MM-DD'), 'Prashant');
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INSERT INTO Library VALUES (2, 'Dark', TO_DATE('2024-07-15','YYYY-MM-DD'), 'Rajendra');
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INSERT INTO Library VALUES (3, 'Hannibal', TO_DATE('2024-07-20','YYYY-MM-DD'), 'Manoj');
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INSERT INTO Library VALUES (4, 'AOT', TO_DATE('2024-07-30','YYYY-MM-DD'), 'Rajesh');
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INSERT INTO Library VALUES (5, 'GOT', TO_DATE('2024-07-19','YYYY-MM-DD'), 'Anil');
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```
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## Trigger
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```sql
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CREATE OR REPLACE TRIGGER library_action
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AFTER INSERT OR UPDATE OR DELETE ON Library
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FOR EACH ROW
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BEGIN
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IF INSERTING THEN
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INSERT INTO Library_Audit (id, title, dateofaction, author, status) VALUES (:NEW.id, :NEW.title, current_timestamp, :NEW.author, 'Insert');
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ELSIF UPDATING THEN
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INSERT INTO Library_Audit (id, title, dateofaction, author, status) VALUES (:OLD.id, :OLD.title, current_timestamp, :OLD.author, 'Update');
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ELSIF DELETING THEN
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INSERT INTO Library_Audit (id, title, dateofaction, author, status) VALUES (:OLD.id, :OLD.title, current_timestamp, :OLD.author, 'Delete');
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END IF;
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END;
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/
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```
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## Testing trigger
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### Insert operation
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```sql
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INSERT INTO Library VALUES (15, 'CREW', TO_DATE('2024-07-22','YYYY-MM-DD'), 'Ramesh');
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INSERT INTO Library VALUES (14, 'Ninteen Eighty Four', TO_DATE('2024-07-01','YYYY-MM-DD'), 'Omkar');
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SELECT * FROM Library;
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SELECT * FROM Library_Audit;
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```
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### Update operation
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```sql
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UPDATE Library SET id = 6, title = 'Sherlock', author = 'Deepak' where id = 3;
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UPDATE Library SET id = 7, title = 'MR. ROBOT', author = 'Varad' where id = 4;
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SELECT * FROM Library;
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SELECT * FROM Library_Audit;
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```
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### Delete operation
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```sql
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DELETE FROM Library WHERE id = 1;
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DELETE FROM Library WHERE id = 5;
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SELECT * FROM Library;
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SELECT * FROM Library_Audit;
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```
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---
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