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    Question :
    What is trigger,cursor,functions in pl-sql and we need sample programs about it?

    Posted by: dilson on 5/19/2008

    Contact dilson Contact dilson
    Category PL-SQL Interview Questions
    Rating (0.4) By 1934 users
    Added on 5/19/2008
    Views 4460
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    Trigger is an event driven PL/SQL block. Event may be any DML transaction.

    Cursor is a stored select statement for that current session. It will not be stored in the database, it is a logical component.

    Function is a set of PL/SQL statements or a PL/SQL block, which performs an operation and must return a value.

    Posted by: Girish P    

    Contact Girish P Contact Girish P

    cursor is a private sql work area.
    Every sql statement executed
    by oracle server has an individual
    cursor associated with it.
    Cursor are two types
    1.Implicit cursor
    2.Explicit cursor
    Implicit cursor: Implicit cursors
    are declared by pl/sql implicitly
    at the time of DML statement and select statement in pl/sql including queries that returns single row.
    cursor have four attributes
    4. SQL%FOUND
    SQL%ROWCOUNT-Basically it returns
    means number of rows
    affected by present sql statement.
    SQL%ISOPEN-Always evalutes false
    because implicit cursor automatically closed after execution of sql statement.
    SQL%FOUND-Always evalutes true
    because one or more rows are affected by recent sql statement
    SQL%NOTFOUND-Always evalutes true when no rows are affected by
    present sql statement.

    example of explicit cursor
    v_empno employees.employee_id%TYPE;
    v_name employees.last_name%TYPE;
    CURSOR emp_cur IS
    SELECT employee_id,last_name
    FROM employees
    OPEN emp_cur;
    FETCH emp_cur INTO v_empno,v_name ;
    EXIT WHEN emp_cur%ROWCOUNT>10 OR

    DBMS_OUTPUT.PUT_LINE('employee_id:'||TO_CHAR(v_empno) || 'employee_name:'||'v_name');

    CLOSE emp_cur;

    Trigger:-Trigger is pl/sql block or
    procedure that is associated with table,view,schema and database.
    Execute immidiately when particular event take place.
    there are two types of trigger
    1.Application trigger:fires automatically when event occurs with particular application.
    2.Database trigger:Fires when
    data such as DML oparation occured at that time.
    DML triggers are two types
    1.Statementlevel trigger
    2.Rowlevel trigger

    statement level trigger-statement level trigger means trigger body
    execute once for the triggering event.this is default.A statement level trigger fire once even no rows are affected at all.
    Row level- Trigger body execute
    once for each row affected by triggering event.if no rows are
    affected in that case trigger body
    not executed.
    trigger example
    BEFORE INSERT ON employees
    RAISE_APPLICATION_ERROR(-20253,'u may insert employee information at business hrs');

    Posted by: Sudipta Das    

    Contact Sudipta Das Contact Sudipta Das

    cursor is temporary work area in
    Type of cusor:
    1.Implict Cursor
    2.Explicit Cursor
    3.Cursor for loop
    4.Cursor With Parametter
    5.Cursor for Update
    6.Ref Cursor

    Curosr Attributes:

    Trigger is asscoiated with table or database event(when a table affect like dml operation that time occurs fire)

    Types of Trigger:
    we can write 12 types trigger

    Posted by: raja    

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    Trigger is a stored procedure that invokes automatically when the event occurs.
    We can write 12 types of triggers on table and 15 types of triggers on views.
    Cursor pointer or handler to the context area . 2 types of cursors are there
    implicit and explicit cursors.

    Posted by: Aruna    

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    Posted by: lal bahadur chaubey    

    Contact lal bahadur chaubey Contact lal bahadur chaubey

    Trigger is a pl/sql block which is executed whenever any dml statement(insert,update,delete)issued against the table.

    Cursor is a memory area in which all the statement are executed and store the result. cursor is 2 types namely implicit cursor and explicit cursor.
    Implicit cursor fetches only one row (normal select into statement) where as Explicit cursor is fetching more than one row and process one by one. In explicit cursor user have to explicitily name the cursor.

    Function is a named pl/sql block which is stored in database. We can invoke by calling the name of the function whenever we need. Function is always return a value.

    Posted by: Vivekanandhan H    

    Contact Vivekanandhan H Contact Vivekanandhan H

    Syntax for Trigger

    CREATE [OR REPLACE ] TRIGGER trigger_name
    [OF col_name]
    ON table_name
    WHEN (condition)
    --- sql statements

    Posted by: Mathankumar R    

    Contact Mathankumar R Contact Mathankumar R

    Some specialists tell that <a href="">home loans</a> aid people to live their own way, because they can feel free to buy necessary goods. Moreover, some banks offer car loan for different persons.

    Posted by: RobinsonValarie    

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