triggers in pl sql

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Develop PL/SQL subprograms and packages, write triggers using PL/SQL, and Apply Oracle and pljdbc to JDBC.

Develop PL/SQL subprograms and packages, write triggers using PL/SQL, and Apply Oracle and pljdbc to JDBC. 1. subprograms: Declaration, executable, and Exception Handling (optional) 2. subprogram classification: A. Process-execute some operations A. syntax of the creation pr

Developing PL/SQL subroutines and packages and writing triggers using PL/SQL, applying Oracle in JDBC

triggersA. Enabling and disabling triggers: When to prohibit: Prohibit data import and exportsql> ALTER TRIGGER aiu_itemfile DISABLE;sql> ALTER TRIGGER aiu_itemfile ENABLE;B. recompiling a trigger: After a database object has changedC. Deleting a triggersql> DROP TRIGGER Aiu_itemfile;19. Triggers and stored proceduresTrigger Stored proceduresWrite no parameter,

Basic PL/SQL programming (9) [Transaction consistency, isolation, concurrency] [row-level triggers, statement triggers, replace

1. Trigger:Concept:It can be seen as a special process, which is automatically executed and does not allow parameters to be included.The trigger can be used to automatically perform some operations, such as row triggers and data triggers. It is mainly a trigger for Data Control languages.2. transactions:Concept: to ensure data integrity. One or more SQL statement

PL/SQL triggers

Label:Trigger Triggers are a technique that is provided by many relational database systems. In Oracle systems, trigger-like procedures and functions have a PL/SQL block that declares, executes, and processes exceptions. 1.1 Trigger Type Triggers are stored as separate objects in the database, unlike stored procedure

Oracle Notes 4-pl/sql-Branches/loops/cursors/exceptions/storage/calls/triggers

);}} Five. Triggers1.--creating triggers to add data-raising actionsCREATE OR REPLACE TRIGGER tri_add_empAfterINSERT on EMP BEGINDbms_output.put_line (' added a piece of data ');END; --Add a piece of data to see if it triggersINSERT into EMP (EMPNO,ENAME,DEPTNO) VALUES (1, ' Tom ', 10); 2.--system time-triggered triggersCREATE OR REPLACE TRIGGER tri_empBeforeDELETE or UPDATE or INSERTOn EMPFor each ROW DECLAREV_datestr VARCHAR2 (20);BEGINSELECT to_cha

PL/SQL Programming (iii) package and package body, triggers, views, indexes

view as a read-only view ( With the Read Only option). --Build Table: Create TableStudent (IdChar(6), Namevarchar2(8), SexChar(2), class_idChar(4)); Create Unique Indexindex_id onStudent (Id);Create IndexIndex_name onStudent (Name); CreateBitmapIndexIndex_sex onStudent (SEX); Conn Scott/Tiger; Grant Insert,update,delete on to system; Conn system/orcl1234; Create or Replace VIEW v_emp as Select Empno,ename,job,hiredate,deptno from Scott.emp; IndexIn order to improve the speed of the

PL/SQL, stored procedures, triggers, functions, packages (learning notes) in Oracle

execution. The ename value of the query is stored in the V_name, and Sal is placed in the V_sal and then displayed.3. Example 3 PL/SQL block with exception handlingDeclare v_name varchar2, v_sal number (7,2); Begin select Ename,sal into V_name,v_sal from EMP where empno=no; Dbms_output.put_line (' Employee Name: ' | |V_name); Dbms_output.put_line (' Salary: ' | | v_sal); Exceptionwhen No_data_found then Db

Simple use of triggers in PL/SQL

[SQL] simple use of triggers 1. Introduction to triggers database Triggers are a PL/SQL program associated with tables. When a specific data operation statement (Insert, update, delete) is issued on a specified table, Oracle autom

Oracle Database PL/SQL triggers

Oracle Database PL/SQL trigger 7) trigger 1. two basic concepts: complete the constraints of complex business rules that are difficult to complete due to the integrity constraints of the database; monitor various operations of the database to implement the audit function. Triggers are divided into: DML triggers

PL/SQL Practice named blocks: stored procedures, functions, triggers, packages

(V_empnoinch Number, V_ename outvarchar2, v_sal out Number) 3 is 4 5 begin 6 7 SelectEname,sal intoV_ename,v_sal fromEmpwhereEmpno=V_empno; 8 9Dbms_output.put_line ('Employee name is:'||v_ename); Ten OneDbms_output.put_line ('Employee Salary is:'||v_sal); AException - whenNo_data_found Then -Dbms_output.put_line ('Employee ID is error!'); the whenOthers Then -Dbms_output.put_line ('Others Error!'); - End;running under the system:

(12) PL/SQL triggers

triggers. if you want to query the same trigger in the table, then the app should use the After keyword, because the trigger can query the table, or change it again the original changes only apply after the table is back to the consistent state. The above trigger has been written in such a way that it executes before any DELETE, insert, or update operation on the table, but can take one or more actions on the trigger, such as before DELETE, This will

PL/SQL Learning (vi) triggers

), product_name varchar2 (+), Supplier_name varchar2 (+), Unit_price number (7,2)); CREATE TABLEProduct(product_id number (5), product_name varchar2 (+), Supplier_name varchar2 (+), Unit_price number (7,2));2) Create a Price_history_trigger trigger and executeCREATE or REPLACETRIGGER Price_history_triggerBeforeUPDATE of Unit_priceOn productFor each ROWBegininsert into product_price_historyvalues (: Old.product_id,:old.product_name,:old.supplier_name,:old.unit_ Price); end;/3) Modify the product'

Oracle Practices--PL/SQL-based triggers and packages

PL/SQL based triggers and packagesPackage/* Packages : Encapsulation of related stored procedures, functions, variables, cursors, and exceptions There are declarations and the composition of the subject Advantages:1. Modular; 2. Easier application design ; 3. Information Hiding ; 4. Better Performance*/-- Declaration of package : keyword: Package is endCreate o

PL/SQL Programming (iii) package and package body, triggers, views, indexes

Conn Scott/tiger;grant insert,update,delete on EMP to System;conn system/orcl1234;create or replace VIEW V_empas select em Pno,ename,job,hiredate,deptno from Scott.emp;IndexIn order to improve the speed of the query, when the user is not satisfied with the query speed and needs to adjust the performance of the database, it is preferred to establish an index.CREATE INDEX idx_ename on employee (ename, Sal DESC);Proper use of indexes can improve the speed of data retrieval and can create indexes on

PL/SQL Dev debug Oracle stored procedures, triggers, and functions

The following describes how to debug a function. Other debugging operations are the same.1. Generally, there are two places to debug the program in pl/SQL Dev: 1). New-> test window: www.2cto.com2) Right-click the program to be debugged and choose test.2. debugging process 1). Enter the testing window through the debugging position, for example:Click position 1 (or press F9) to enter the debugger. Position

PL/SQL Dev debug Oracle stored procedures, triggers, and functions

The following describes how to debug a function. Other debugging operations are the same.   1. debugging location In general, there are two places to debug the program in pl/SQL Dev: 1). New-> test window: 2) Right-click the program to be debugged and choose test.   2. debugging process 1) enter the test window through the debugging position, for example: Click position 1 (or press F9) to enter the debug

PL/SQL triggers for Oracle databases, rownum, dynamic SQL, database views and indexes

The When clause describes the triggering constraint condition. When condition is a logical expression, it must contain a correlation name, not a query statement, or a PL/SQL function. The trigger constraint specified by the When clause can only be used in before and after row triggers, not in instead of row triggers an

Oracle Learning-PL loops, triggers in SQL stored procedures

progressive in a non-trivial way (that is, the growth stride is not 1), you have to write some clever code, here's a simple example: using simple multiplication in a loop, the recursion takes only half the number of times: (Not quite) for inch 1 - LOOP calc_values (even_number*2); END LOOP; Looping Tags: you can give a loop name by label, format: All_emps>> forEmp_recinchemp_cur LOOP ...ENDLOOP;--tags can also be followed by end loop reserved words, which are optional Year_loop>> wh

pl/sql& Stored Procedures | | Storage functions & Triggers

. Result set object (using cursor) Sql:string sql = "{call Mypackage.queryemplist (?,?)}"; Call the stored procedure with the cursor Call.registeroutparameter (2, oracletypes.cursor); Cursor type Data dictionary Meta Data Database framework Triggers: Row-level triggers, statement-level triggers Instance: /*implement co

Oracle Note 11, PL/SQL functions, and triggers

--Create a functionCreate or Replace function Add_sal (ssal number) return numberIsBegin if (Ssal >) Then return ssal + 51; elsif (Ssal >) Then return ssal + 111; Else return ssal + 222; End If;EndSelect Sal, Add_sal (SAL) from EMP;--TriggerCREATE TABLE Deptlog ( UName varchar2 (20), Action Varchar2 (20), DTime Date);--Create a trigger--for each row can trigger multiple entries, and how many times your language affects how many records will be triggeredCreate

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