barcode generator in vb.net code project Creating SQL-Invoked Procedures in Software

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Creating SQL-Invoked Procedures
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CREATE PROCEDURE GET_CD_ARTISTS ( ) SELECT cd.CD_TITLE, a.ARTIST_NAME FROM COMPACT_DISCS cd, ARTIST_CDS ac, ARTISTS a WHERE cd.COMPACT_DISC_ID = ac.COMPACT_DISC_ID AND ac.ARTIST_ID = a.ARTIST_ID;
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SQL: A Beginner s Guide
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CALL GET_CD_ARTISTS( ); DROP PROCEDURE GET_CD_ARTISTS CASCADE; SELECT FROM WHERE AND AND cd.CD_TITLE, a.ARTIST_NAME COMPACT_DISCS cd, ARTIST_CDS ac, ARTISTS a cd.COMPACT_DISC_ID = ac.COMPACT_DISC_ID ac.ARTIST_ID = a.ARTIST_ID cd.CD_TITLE = p_CD;
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CALL GET_CD_ARTISTS('Fundamental'); CREATE PROCEDURE GET_CD_AMOUNT ( ) BEGIN DECLARE v_In_Stock INT; SET v_In_Stock = ( SELECT AVG(IN_STOCK) FROM COMPACT_DISCS ); SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE IN_STOCK < v_In_Stock; END; CALL GET_CD_AMOUNT( );
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Creating SQL-Invoked Functions
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CREATE FUNCTION CD_LABEL ( p_CD VARCHAR(60) ) RETURNS VARCHAR(60) BEGIN RETURN ( SELECT COMPANY_NAME FROM COMPACT_DISCS d, CD_LABELS l WHERE d.LABEL_ID = l.LABEL_ID AND CD_TITLE = p_CD ); END; SELECT FROM WHERE AND CD_TITLE, COMPANY_NAME COMPACT_DISCS d, CD_LABELS l d.LABEL_ID = l.LABEL_ID COMPANY_NAME = CD_LABEL ('Blues on the Bayou');
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DROP FUNCTION CD_LABEL CASCADE;
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Creating SQL Triggers
CREATE TABLE ARTIST_LOG ( ACTION_TYPE CHAR(6), ARTIST_ID INT,
Appendix C:
SQL Code Used in Try This Exercises
MOD_DATE
TIMESTAMP DEFAULT CURRENT_TIMESTAMP );
CREATE TRIGGER INSERT_LOG AFTER INSERT ON ARTISTS REFERENCING NEW ROW AS New FOR EACH ROW BEGIN ATOMIC INSERT INTO ARTIST_LOG ( ACTION_TYPE, ARTIST_ID ) VALUES ( 'INSERT', New.ARTIST_ID ); END; CREATE TRIGGER UPDATE_LOG AFTER UPDATE ON ARTISTS REFERENCING NEW ROW AS New FOR EACH ROW BEGIN ATOMIC INSERT INTO ARTIST_LOG ( ACTION_TYPE, ARTIST_ID ) VALUES ( 'UPDATE', New.ARTIST_ID ); END; CREATE TRIGGER DELETE_LOG AFTER DELETE ON ARTISTS REFERENCING OLD ROW AS Old FOR EACH ROW BEGIN ATOMIC INSERT INTO ARTIST_LOG ( ACTION_TYPE, ARTIST_ID ) VALUES ( 'DELETE', Old.ARTIST_ID ); END; INSERT INTO ARTISTS ( ARTIST_ID, ARTIST_NAME ) VALUES ( 2019, 'John Lee Hooker' ); UPDATE ARTISTS SET PLACE_OF_BIRTH = 'Clarksdale, Mississippi, USA' WHERE ARTIST_ID = 2019; DELETE ARTISTS WHERE ARTIST_ID = 2019 SELECT * FROM ARTIST_LOG; DROP TRIGGER INSERT_LOG; DROP TRIGGER UPDATE_LOG; DROP TRIGGER DELETE_LOG; DROP TABLE ARTIST_LOG;
SQL: A Beginner s Guide
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Working with SQL Cursors
DECLARE v_CD_NAME VARCHAR (60); DECLARE CD_cursor_1 CURSOR FOR SELECT CD_TITLE FROM COMPACT_DISCS ORDER BY CD_TITLE ASC; OPEN CD_cursor_1; FETCH CD_cursor_1 INTO v_CD_NAME; CLOSE CD_cursor_1;
DECLARE v_CD_NAME VARCHAR(60); DECLARE CD_cursor_2 SCROLL INSENSITIVE CURSOR FOR SELECT CD_TITLE FROM COMPACT_DISCS ORDER BY CD_TITLE ASC FOR READ ONLY; OPEN CD_cursor_2; FETCH LAST FROM CD_cursor_2 INTO v_CD_NAME; CLOSE CD_cursor_2;
DECLARE v_CD_NAME VARCHAR(60); DECLARE CD_cursor_3 CURSOR FOR SELECT CD_TITLE FROM COMPACT_DISCS FOR UPDATE; OPEN CD_cursor_3; FETCH CD_cursor_3 INTO v_CD_NAME; UPDATE COMPACT_DISCS SET IN_STOCK = IN_STOCK * 2 WHERE CURRENT OF CD_cursor_3;
Appendix C:
SQL Code Used in Try This Exercises
CLOSE CD_cursor_3;
SELECT * FROM COMPACT_DISCS;
UPDATE COMPACT_DISCS SET IN_STOCK = 13 WHERE COMPACT_DISC_ID = 101;
Try This 16-1
Working with Transactions
START TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; SELECT * FROM ARTISTS; COMMIT;
START TRANSACTION ISOLATION LEVEL SERIALIZABLE; UPDATE COMPACT_DISCS SET IN_STOCK = IN_STOCK + 2 WHERE LABEL_ID = 832; ROLLBACK;
SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832;
START TRANSACTION ISOLATION LEVEL SERIALIZABLE; SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832; SAVEPOINT SECTION_1; UPDATE COMPACT_DISCS SET IN_STOCK = IN_STOCK + 2 WHERE LABEL_ID = 832; ROLLBACK TO SAVEPOINT SECTION_1;
SQL: A Beginner s Guide
Try This 17-1
Embedding SQL Statements
EXEC SQL BEGIN DECLARE SECTION; long v_CD_ID; /* input variable for CD identifier */ varchar v_CD_TITLE[60]; /* output variable for CD title */ long v_IN_STOCK; /* output variable for IN_STOCK value */ EXEC SQL END DECLARE SECTION; short ind_CD_TITLE; /* indicator variable for v_CD_TITLE */ short ind_IN_STOCK; /* indicator variable for v_IN_STOCK */ EXEC SQL BEGIN DECLARE SECTION; long v_CD_ID; /* input variable for CD identifier */ varchar v_CD_TITLE[60]; /* output variable for CD title */ short IND_CD_TITLE; /* indicator variable for v_CD_TITLE */ long v_IN_STOCK; /* output variable for IN_STOCK value */ short ind_IN_STOCK; /* indicator variable for v_IN_STOCK */ EXEC SQL END DECLARE SECTION; EXEC SQL WHENEVER SQLEXCEPTION GOTO Error1; EXEC SQL SELECT INTO FROM WHERE
CD_TITLE, IN_STOCK :v_CD_TITLE :ind_CD_TITLE, :v_IN_STOCK :ind_IN_STOCK COMPACT_DISCS COMPACT_DISC_ID = :v_CD_ID;
EXEC SQL BEGIN DECLARE SECTION; long v_CD_ID; /* input variable for CD identifier */ varchar v_CD_TITLE[60]; /* output variable for CD title */ short ind_CD_TITLE; /* indicator variable for v_CD_TITLE */ long v_IN_STOCK; /* output variable for IN_STOCK value */ short ind_IN_STOCK; /* indicator variable for v_IN_STOCK */ EXEC SQL END DECLARE SECTION; EXEC SQL WHENEVER SQLEXCEPTION GOTO Error1; EXEC SQL SELECT CD_TITLE, IN_STOCK INTO :v_CD_TITLE :ind_CD_TITLE, :v_IN_STOCK :ind_IN_STOCK FROM COMPACT_DISCS WHERE COMPACT_DISC_ID = :v_CD_ID;
Appendix C:
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