Validating date during insert operation in pl sql with examples

16-Sep-2019 21:30

First, here is an example of what I mean by fetching one record at a time: CREATE OR REPLACE PROCEDURE one_at_a_time AS CURSOR curs_get_ord IS SELECT order_number, order_date FROM orders ORDER BY order_number; v_order_number NUMBER; v_order_date DATE; BEGIN FOR v_order_rec IN curs_get_ord LOOP do_something; END LOOP; END; CREATE OR REPLACE PROCEDURE all_at_once AS CURSOR curs_get_ord IS SELECT order_number, order_date FROM orders ORDER BY order_number; -- local collections to hold bulk fetched values TYPE v_number_t IS TABLE OF NUMBER; TYPE v_date_t IS TABLE OF DATE; v_order_number v_number_t; v_order_date v_date_t; BEGIN -- get all orders at once OPEN curs_get_ord; FETCH curs_get_ord BULK COLLECT INTO v_order_number, v_order_date; CLOSE curs_get_ord; -- if any orders were found then loop through the local -- collections to process them IF NVL(v_order_number.

COUNT,0) For large record sets, the performance gain can be huge, so I highly recommend that you use this option whenever you can.

Note, however, that REF cursors are not soft-closed, so they cannot take advantage of being opened extra-super-duper quickly later on.

Thus, REF cursors will not work as fast as normal cursors.

There is also another, less obvious advantage to performing bulk fetches: the database does not have to maintain a read-consistent view of the data while the records it retrieves are processed. If the mythical DO_SOMETHING procedure took five seconds to process each of the 100 records retrieved from the ORDERS table, Oracle would have to maintain a read-consistent copy of the records in the result set for more than eight minutes.

If the ORDERS table is busy with many other DML operations, then the database's rollback segments will be busy keeping a view of the data in synch for the long operation.

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Creation of table: Use the following command to the create table: Commit Command: Commit is used for the permanent changes.ction statements that are called Data Control Language for SQL and are used to ensure the integrity of data in databases.In my previous article I describe Grant and Revoke DCL commands; for that visit, Grant and Revoke Command in SQL SERVER.Bulk fetching, REF cursors, cursor parameters, and cursor expressions are especially handy tools for DBAs who need ways to investigate and improve the performance of applications.The features discussed here are particularly helpful if you are working with very busy databases where keeping the number of records touched to an absolute minimum is very important.

Creation of table: Use the following command to the create table: Commit Command: Commit is used for the permanent changes.ction statements that are called Data Control Language for SQL and are used to ensure the integrity of data in databases.In my previous article I describe Grant and Revoke DCL commands; for that visit, Grant and Revoke Command in SQL SERVER.Bulk fetching, REF cursors, cursor parameters, and cursor expressions are especially handy tools for DBAs who need ways to investigate and improve the performance of applications.The features discussed here are particularly helpful if you are working with very busy databases where keeping the number of records touched to an absolute minimum is very important.Syntax:begin tran tran Name Command for operation Rollback tran tran Name Here tran Name is the name of the transaction and the command for the operation is the SQL statement that is used for performing operations like to make any change or insert data etc.