Oracle9i PL/SQL: A Developer’s Guide by Bulusu Lakshman

By Bulusu Lakshman

Oracle9i PL/SQL: A builders Guide is meant for either intermediate-level Oracle builders who're designing or coding purposes in SQL and PL/SQL and for complicated PL/SQL programmers who have to research new PL/SQL 9ifeatures. as well as delivering builders with particular assurance of the PL/SQL 9i language itself, writer Bulusu Lakshman covers the innovations of utilizing PL/SQL 9i for server-side purposes and offers the method for enforcing powerful functions. Lakshman additionally mentors builders in imposing potent options for real-world and code-centric Oracle functions that, in the end, will shop them time and effort.

Oracle9i PL/SQL: A builders Guide is a superb resource for the improvement of Oracle9i PL/SQL purposes. builders incorporating those applied sciences into new purposes and people migrating from past models will either locate Lakshman's professional remedy of the subject precious.

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The SELECT statement associated with a cursor can't contain an INTO clause. It may, however, have GROUP BY and ORDER clauses, as well as joins and set operators such as UNION, INTERSECT, and MINUS. The scope of a cursor is the PLlSQL block in which it is defined or any of its nested blocks. Enclosing (outer) blocks can't reference a cursor defined within them. Using an Explicit Cursor Once you've defined a cursor, you can use it for processing the rows contained in the resultset. Here are the steps: 1.

The following sections describe these attributes in more detail. 45 Chapter2 %FOUND You use %FOUND to determine whether a FETCH returned a row or not. You should use it after a cursor is opened, and it returns a value of TRUE if the immediate FETCH yielded a row, and a value of FALSE if the immediate FETCH did not fetch any row. Using %FOUND before opening a cursor or after closing a cursor raises the error "ORA-OlOOl: invalid cursor" or the predefined exception INVALID_CURSOR. I presented an example ofusing %FOUND during the discussion ofusing the WHILE LOOP to fetch multiple rows.

Dot) notation of accessing record type attributes by succeeding the index name with a dot followed by the column name in the cursor SELECT. • There is no need to OPEN, FETCH, and CLOSE the cursor. TIP An important use ofthe cursor FOR LOOP is when you process all the rows in a cursor unconditionally. This is a recommended practice and is in contrast to the conuentional method of OPEN, FETCH, and CLOSE, which is used to process some ofthe rows or to skip some rows on a certain condition. Avoiding Declaration of an Explicit Cursor with a Cursor FOR WOP In the earlier example, although the cursor FOR LOOP was used, the cursor cscorg was still declared in the declaration section of the PLlSQL block.

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