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Pl sql inserting updating

It’s rare, in fact, that the data with which you are working is just a single value, so records and other composite datatypes are likely to figure prominently in your PL/SQL programs.

This article explores how you declare records, populate them with rows from a table, and even insert or change an entire row in a table by using a record.

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By using %ROWTYPE to declare the record, I also tell Oracle Database that this procedure the omag_employees table.Cursor FOR Loops and Implicitly Declared Records Suppose I want to write a program to display the last names of all employees.An elegant and simple way to do this in PL/SQL is to take advantage of the cursor FOR loop (which I discussed in part 2 of this PL/SQL 101 series).This way, when and if the SELECT list of the cursor changes, the number and type of fields in the record will change accordingly and everything will stay in sync.Working with Record Variables Once you have declared a record in your block, you can both read and change the record’s value.This is especially helpful for fetching either a subset of columns from a table or columns from multiple tables.Here’s an example: (Note that I usually add a “_cur” suffix to the names of my explicitly declared cursors.) Whenever you are fetching data from a cursor into PL/SQL variables, you should declare a record based on that cursor with %ROWTYPE and fetch into that record.The cursor FOR loop is a variation on the numeric FOR loop, which looks like this: The index is implicitly declared by Oracle Database as an integer and can be referenced only inside the body of this loop.A cursor FOR loop has a similar structure but replaces a numeric range with a query: loop index as well, but in the case of a cursor FOR loop, it declares the index as a record by using %ROWTYPE against the query in the loop header.Tables are made up of rows of data, each consisting of one or more columns, so it stands to reason that Oracle Database would make it as easy as possible to work with those rows of data inside a PL/SQL program.And it does precisely that through its implementation of the datatype, such as a number or string.

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  1. The Oracle PL/SQL language was designed to be a portable, high-performance transaction processing language that is tightly integrated with the SQL language. It is rare, indeed, to find a PL/SQL program that does not either read from or make changes to tables in a database. Tables are made up of rows.

  2. Learn how to concatenate rows into a single CLOB row in PL/SQL with this sample code from PL/SQL expert Dan Clamage

  3. What are PL/SQL Triggers. Types of PL/SQL Triggers. What is Row Level Trigger. What is Statement Level Trigger.

  4. Using PL/SQL Collections and Records. This chapter explains how to create and use PL/SQL collection and record variables. These composite variables have internal components that you can treat as individual variables.

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