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declaring recordswhenever you define a record type you may declare records of that type as the illustration showsdeclaretype stockitem is record
defining and declaring recordsto create records you have to define a record type and then declare records of that type you may also define record
what is a record a record is a group of related data items that stored in the fields each with its own name and datatype assume that you have
using cursor attributesto process the sql data manipulation statements the sql engine must opens an implicit cursor named sql this cursors attributes
using host arraysthe client-side programs can use anonymous plsql blocks to bulk-bind input and output host arrays however this is the well-organized
using forall and bulk collect togetheryou can unite the bulk collect clause with the forall statement in that case the sql engine bulk-binds column
bulk fetchingthe illustration below shows that you can bulk-fetch from a cursor into one or more collectionsdeclaretype nametab is table of
using the bulk collect clausethe keywords bulk collect specify the sql engine to bulk-bind output collections before returning them to the plsql
rollback behaviorwhen a forall statement fails the database changes are rolled back to an implicit savepoint marked before each of the sql statement
using the forall statementthe keyword forall instruct the plsql engine to bulk-bind input collections before sending them all to the sql engine
how bulk binds improve performancethe assigning of values to the plsql variables in sql statements is known as bindingthe binding of the whole
using deletethis process has three forms the delete removes all elements from the collection deleten removes the nth element from the nested table
using trimthis process has two forms the trim removes an element from the end of the collection the trimn removes the n elements from the end of the
using extendto enlarge the size of a collection use extend this process has 3 forms the extend appends one null element to a collection and the
using prior and nextthe priorn returns the index number that precede index n in a collection the nextn returns the index number which succeed the
using first and lastfirst and last return the first and last minimum and maximum index numbers in a collection when the collection is empty the first
using limitfor nested tables that have no maximum size the limit returns null for varrays the limit returns the maximum number of elements that a
using countthe count returns the number of elements that a collection presently contains for instance when a varray projects contains 15 elements
using existsthe existsn returns true if the nth element in a collection exist or else existsn returns false primarily you use exists with delete to
using the collection methodsthe collection methods below help to generalize the code and make collections easier to use and also make your
manipulating local collectionswithin plsql to manipulate the local collection by using the table and cast operators the operands of cast are a
manipulating individual elementsfaraway you have manipulated an entire collection within the sql to manipulate the individual elements of the
some varray examplesin sql plus assume that you define an object type project as described belowsqlgt create type project as object 2 projectno
manipulating collectionswithin plsql the collections add procedural power and flexibility the biggest benefit is that your program can compute
assigning and comparing collectionsone collection can be assigned to other by an select insert update or fetch statement an assignment statement or