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Chapter 8

Chapter 8. Advanced SQL Database Systems: Design, Implementation, and Management, Seventh Edition, Rob and Coronel. Numeric Functions. String Functions. String Functions (continued). Conversion Functions. Conversion Functions (continued). Conversion Functions (continued).

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Chapter 8

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  1. Chapter 8 Advanced SQL Database Systems: Design, Implementation, and Management, Seventh Edition, Rob and Coronel

  2. Numeric Functions Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  3. String Functions Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  4. String Functions (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  5. Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  6. Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  7. Conversion Functions Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  8. Conversion Functions (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  9. Conversion Functions (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  10. SQL Server Identity (Oracle Sequences) ALTER TABLE CUSTOMER ADD CUS_CODE_SEQ INT IDENTITY(20010,1); ALTER TABLE INVOICE ADD INV_NUMBER_SEQ INT IDENTITY(4010,1); ALTER TABLE LINE ADD INV_NUMBER_SEQ INT IDENTITY(4010,1); Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  11. BEGIN TRANSACTION; INSERT INTO CUSTOMER VALUES (10020, 'Connery', 'Sean', NULL, '615', '898-2007', 0.00); INSERT INTO INVOICE VALUES (1009, 10010, CURRENT_TIMESTAMP); INSERT INTO LINE VALUES (1009, 1,'13-Q2/P2', 1, 14.99); INSERT INTO LINE VALUES (1009, 2,'23109-HB', 1, 9.95); COMMIT; Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  12. Updatable Views Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  13. Updatable Views (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  14. Updatable Views (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  15. Updatable Views (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  16. Procedural SQL 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  17. Procedural SQL (continued) • SHOW ERRORS • Can help diagnose errors found in PL/SQL blocks • Yields additional debugging information whenever error is generated after creating or executing a PL/SQL block Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  18. Procedural SQL (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  19. Procedural SQL (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  20. Triggers Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  21. Triggers (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  22. Triggers (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  23. Triggers (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  24. Triggers (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  25. Triggers (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  26. Triggers (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  27. Triggers (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  28. Triggers (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  29. Triggers (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  30. Triggers (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  31. Stored Procedures • Advantages • Substantially reduce network traffic and increase performance • No transmission of individual SQL statements over network • Help reduce code duplication by means of code isolation and code sharing • Minimize chance of errors and cost of application development and maintenance Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  32. Stored Procedures (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  33. Stored Procedures (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  34. Stored Procedures (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  35. Stored Procedures (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  36. Stored Procedures (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  37. Stored Procedures (continued) 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  38. Stored Procedures (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  39. PL/SQL Processing with Cursors • A cursor is a special construct used in procedural SQL to hold the data rows returned by an SQL query • Implicit cursor – automatically created when the SQL query returns only one value • Explicit cursor CURSOR cursor_name IS select-query; Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  40. PL/SQL Processing with Cursors Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  41. PL/SQL Processing with Cursors (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  42. PL/SQL Processing with Cursors 請參考 SQL Server 版 Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  43. PL/SQL Stored Functions • Syntax: • CREATE FUNCTION function_name (argument IN data-type, …) RETURN data- type [IS]BEGIN PL/SQL statements; … RETURN (value or expression);END; Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  44. 8.8 Embedded SQL (以下跳過) 專題會用到 • Key differences between SQL and procedural languages are: • Run-time mismatch • SQL executed one instruction at a time at the server side • Host language typically runs at client side in its own memory space • Processing mismatch • Host language processes one data element at a time • Data type mismatch • Data types may not match Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  45. Embedded SQL (continued) • Embedded SQL framework defines: • Standard syntax to identify embedded SQL code within host language • EXEC SQL / END-EXEC • Standard syntax to identify host variables (:var) • Communication area used to exchange status and error information between SQL and host language: SQLCODE and SQLSTATE Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  46. Embedded SQL (continued) Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  47. Embedded SQL (continued) • General steps to create and run an executable program with embedded SQL: • Write embedded SQL code within the host language instructions EXEC SQL SQL statement END-EXEC • A preprocessor is used to transform the embedded SQL into specialized procedure calls that are DBMS-and-language-specific. • Compile the program using the host language compiler • The object code is linked to the respective library modules and generates the executable program • The executable is run and the embedded SQL statement retrieves data from the database Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  48. SQLCODE + COBOL EXEC SQL SELECT EMP_FNAME, EMP_LNAME INTO :W_EMP_FNAME, :W_EMP_LNAME FROM EMPLOYEE WHERE EMP_NUM=:W_EMP_NUM; END-EXEC IF SQLCODE = 0 THEN PERFORM DATA_ROUTINE ELSE PERFORM ERROR_ROUTINE END-IF Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  49. CURSOR 1. EXEC SQL DECLARE PROD_CURSOR FOR SELECT P_CODE, P_DESC FROM PRODUCT WHERE P_ON_HAND > (SELECT AVG(P_ON_HAND) FROM PRODUCT); 2. EXEC SQL OPEN PROD_CURSOR; END-EXEC 3. EXEC SQL FETCH PRODUCT_CURSOR INTO :W_P_CODE, :W_P_DESC; END-EXEC IF SQLCODE = 0 THEN …. 4. EXEC SQL CLOSE PROD_CURSOR; END-EXEC Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

  50. Embedded SQL (continued) • Static SQL • Embedded SQL in which programmer used predefined SQL statements and parameters • End users of programs are limited to actions that were specified in application programs EXEC SQL DELETE FROM EMPLOYEE WHERE EMP_NUM = :W_EMP_NUM; END-EXEC • SQL statements will not change while application is running Database Systems: Design, Implementation, & Management, 7th Edition, Rob & Coronel

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