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Variable Declaration Using Database Objects %rowtype

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In the examples so far we have declared variables as a separate object using one of PL/SQL’s standard datatypes. Normally a PL/SQL variable is closely tied to a database object and uses the same datatype. For example, if the variable will hold the book title from the book table , the variable definition must be of the exact same type and size as the table column. But what happens when the DBA changes the book table so that book_title is defined as a varchar2(60) instead of a varchar2(40)? It’s important to program in such a way that when the tables are changed, the PL/SQL code does not always need to be changed

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  1. -- Oracle has provided a method to declare a variable using the database object the data is based on.  To execute this use the %type declaration.
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  3. v_auth_name author.author_last_name%TYPE;
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  6. -- You can also create records using the %rowtype  declaration.
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  8. r_auth  author%rowtype;

URL: http://www.rampant-books.com/t_easyoracle_pl_sql_variable_declaration_db_objects.htm

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