pl sql trigger example

tables. Therefore, an alternative trigger is given.3. System triggersIt can be triggered in the event of an Oracle database system, such as the startup and shutdown of an Oracle system.② triggers consist of: Trigger event: in which case the trigger is triggered; For example: INSERT, UPDATE, DELETE.

then close C;end if;end;Create a function--Create a function that can remove the space of the string create or Replace function Noblank1 (str varchar) return Varcharisbeginreturn replace (str, ', '); end ;--Call function Select Noblank1 (' DFA D s a ') from dual;Create a Trigger--Creating a trigger create or replace trigger Stu_update_tribefore update on Student

Problem Description:Oracle uses PL/SQL developer to export data to CSV format, VARCHAR2 Type field if the value (for example, 3307830000004059) is too long, the CSV file is represented in scientific notation, even if the column is selected, click Data--. > columns, fixed width, column data format select text, and the last one will still be set to 0.Workaround:Ora

• The current operation is insert only if the inserted table has data;inserted and deleted two tables have data, the current operation is update;• The current action is delete only if the deleted table has data. Creating Triggers with Create TRIGGER The code is as follows Copy Code CREATE TRIGGER Trigger NameOn table nameFor INSERT,

As we all know, Java provides a split () string split method for the string class, so it's easy to split the string into a string array with the specified symbol. However, the split () method in Java is not provided in the pl/sql, so it is necessary to implement the string segmentation in the Pl/sql. Because in the pro

SQL queries the example of the table, stored procedure, trigger Creation Time, and last modification time. The creation time is modified. -- Query creation time -- table select * from sysobjects where id = object_id (n'table name ') and xtype = 'U' -- select * from syscolumns where id = object_id (N 'table name ') -- stored procedure select * from sysobjects whe

This section will analyze a more complex example based on the pl/sql of the previous study to teach readers how to write a complete pl/sql program.Example Design1. Function designThe postgraduate enrollment system developed by a university requires the design of the

=spno;End-----3. How to call in Java---1. Create CallableStatement CS =ct.preparecall ([Call Sp_pro9 (?,?)]);----Cs.setint (1,10);----Cs.registeroutparameter (2,oracle.jdbc.oracletypes.cursor);--run--cs.execute ();--Get the result set/*resultset rs= (ResultSet) Cs.getobject (2);while (Rs.next ()) {....}*/---------------------Exception Handling---------Case_not_foundData_not_foundCursor_already_openDup_val_on_index Unique index repeatedInvaild_cursor run operation on an illegal cursor for

As is known to all, Java provides a split () string method for splitting strings, so it is easy to split the string into a string array with the specified symbol. However, the split () method in Java is not provided in PL/SQL, so it is necessary to do it yourself if you want to implement string segmentation in PL/SQL.

: triggers cannot be explicitly called. 9. Trigger functions: Automatically generate data, customize complex security permissions, provide audit and logging, and enable complex business logic 10. Create a trigger syntax CREATE [or replace] TRIGGER trigger_name AFTER | BEFORE | instead of [INSERT] [[OR] UPDATE [OF column_list] [[OR] DELETE] ON table_or_view_name [

handling section. The PL/SQL program block can be independently compiled and stored in the database, and any application connected to the database can access the stored pl/sql blocks. Oracle provides four types of stored programs: . Function . Process . Package . Trigger