New SQL Features in Firebird

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18 ALTER VIEW \ COMPUTED FIELD Syntax {CREATE OR ALTER | ALTER} VIEW [()] AS ALTER TABLE ALTER [TYPE ] COMPUTED BY () Task ● change view (or computed field) definition ● Before Firebird 2.5 ● drop and create (or alter two times) again all dependent objects ● restore all privileges granted to all dependent objects which was re-created ● Firebird 2.5 ● just execute ALTER VIEW and enjoy :-) Luxembourg 2011 Whats new in Firebird SQL
19 ALTER VIEW \ COMPUTED FIELD Example CREATE TABLE T (NAME CHAR(20), CF COMPUTED BY (LEFT(NAME, 10)) ); CREATE VIEW V AS SELECT CF FROM T; CREATE PROCEDURE P ... SELECT ... FROM V ...; -- dependent procedure Before Firebird 2.5 : Try to change both view and computed field definitions ALTER PROCEDURE P AS BEGIN END; -- empty body for ALL dependent objects DROP VIEW V; ALTER TABLE T DROP CF; ALTER TABLE T ADD CF COMPUTED BY (SUBSTRING(NAME FOR 15)); CREATE VIEW V AS SELECT NAME, CF FROM T; GRANT SELECT ON TABLE T TO VIEW V; -- restore ALL dependent ALTER PROCEDURE P ... SELECT ... FROM V ...; -- objects and privileges What if you have hundreds dependent objects ? Luxembourg 2011 Whats new in Firebird SQL
Page 1 and 2: New SQL Features in Firebird
Page 3 and 4: ● Common SQL ● SIMILAR TO ● S
Page 5 and 6: 5 Common SQL : SQLSTATE SQLSTATE is
Page 7 and 8: 7 Common SQL : HEX literals String
Page 9 and 10: 9 Common SQL : UUID CHAR UUID_TO_C
Page 11 and 12: 11 PSQL : EXECUTE STATEMENT ● New
Page 13 and 14: 13 PSQL : EXECUTE STATEMENT -- logo
Page 15 and 16: 15 PSQL : EXECUTE STATEMENT Common
Page 17: Syntax 17 PSQL : TYPE OF COLUMN dat
Page 21 and 22: Syntax 21 DDL : USER MANAGEMENT CRE
Page 23 and 24: 23 MON$DATABASE MON$DATABASE_NAME .
Page 25 and 26: 25 MONITORING TABLES 1) Cancel curr
Page 27 and 28: ● Common SQL ● Full syntax of M
Page 29 and 30: ● DDL ● Manage nullability of c
Page 31 and 32: Full SQL 2008 syntax MERGE INTO 31
Page 33 and 34: RETURNING clause MERGE INTO 33 Com
Page 35 and 36: Common SQL : WINDOW FUNCTIONS Synta
Page 37 and 38: Syntax Rules 37 Common SQL : substr
Page 39 and 40: Syntax 39 Common SQL : BOOLEAN data
Page 41 and 42: Examples 41 Common SQL : BOOLEAN da
Page 43 and 44: Examples 43 Common SQL : BOOLEAN da
Page 45 and 46: The reason of the issue 45 Common S
Page 47 and 48: The Firebird 3 way 47 Common SQL :
Page 49 and 50: PSQL notes 49 Common SQL : cursor s
Page 51 and 52: Syntax 51 PSQL : SQL functions {CRE
Page 53 and 54: Example 53 EXECUTE BLOCK RETURNS (N
Page 55 and 56: Syntax 55 DDL : IDENTITY columns :
Page 57 and 58: 57 DDL : DDL triggers New context v
Page 59: 59 THANK YOU FOR ATTENTION Question

New SQL Features in Firebird

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