http://www.openclipart.org , non lo conoscevo e ne sono rimasto veramente impressionato, è un archivio di ClipArt in fomrato vettoriale SVG enorme, qualsiasi cosa ho scritto nella ricerca mi son trovato l’immagine corrispondente. Come direbbe il signor Burns dei Simpons “Eccellente”. Ogni immagine selezionata è disponibile per il download in formato sia svg che png. Ogni…
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Oracle Version : 10g As you know inside a Oracle row trigger you cannot access to the base table, for example when you make a trigger like this, on a table named “activity“.
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CREATE OR REPLACE TRIGGER UNAME.ACTIVITY_FK_MENU_INTEGRITY AFTER INSERT OR UPDATE ON UNAME.ACTIVITY REFERENCING NEW AS New OLD AS Old FOR EACH ROW DECLARE tmpVar NUMBER; e_Menu_Already_Exists EXCEPTION; BEGIN Select count(*) into tmpVar from Activity aa where (aa.fk_menu = :new.fk_menu)and(aa.pk_id <> :new.pk_id); -- if (tmpVar > 0) then --:New.FK_MENU := null; -- raise e_Menu_Already_Exists; -- end if; END ACTIVITY_FK_MENU_INTEGRITY; |
when you try to use the table making an update happen this : To avoid this error and obviusly assuming the…
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Hello, we want to sync two directories in two different server that are connected to the internet. We want to use ssh as channel protocol because we already have the firewall rules to connect and because it is encrypted. First of all we need that machine A will connect to machine B without password asking,…
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L’inversione di tendenza ? ma speriamo di no, che l’Open Source abbia permesso a milioni di società e di individui singoli di poter accedere ,e dare il proprio contributo ,a Software prima inarrivabili è ormai noto. Era normale aspettarsi che tutti coloro che giustamente vivono sulle licenze dei “loro” software non vedano di buon occhio…
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by using some simple view in Oracle you can extract a lot of information about your DB schema, some explicit samples : (assuming that MyDBOwner is the owner of the DB and ACTIVITY is a table of a schema, this sample is succesfully tested on Oracle 10g)
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-- LIST OF USERS select OWNER,COUNT(DISTINCT TABLE_NAME) from ALL_TAB_COLUMNS GROUP BY OWNER -- LIST OF TABLES PER OWNER select table_name from ALL_TAB_COLUMNS where owner = 'MyDBOwner' group by table_name -- LIST OF FIELDS PER TABLE select COLUMN_NAME, DATA_TYPE, DATA_LENGTH, NULLABLE, CHAR_LENGTH from ALL_TAB_COLUMNS where owner = 'MyDBOwner' AND TABLE_NAME = 'ACTIVITY' -- FINDING PRIMARY KEYS select COLUMN_NAME, DATA_TYPE, DATA_LENGTH, NULLABLE, CHAR_LENGTH from ALL_TAB_COLUMNS where owner = 'MyDBOwner' AND TABLE_NAME = 'ACTIVITY' -- A single character that indicates the type of constraint: 'C' = NOT NULL, 'P' = PRIMARY KEY, 'U' = UNIQUE, and 'R' = FOREIGN KEY. SELECT UC.CONSTRAINT_NAME, UCC.* FROM USER_CONSTRAINTS UC, USER_CONS_COLUMNS UCC WHERE UC.OWNER='MyDBOwner' AND UC.TABLE_NAME = 'ACTIVITY' AND UC.CONSTRAINT_TYPE = 'P' AND UC.CONSTRAINT_NAME = UCC.CONSTRAINT_NAME |
a great article about this is :…
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(This article is a draft but if something is of interesting …. ) The fantastic world of old Midas now called DataSnap introduced the TClientDataSet component , that is a in memory DataSet for Delphi and C++ Builder. With TClientDataSet was introduced the concept of Brief Case model Application Style. A brief case model App.…
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