Chapter 9: Problem 6

What is SQLJ used for? Describe the two types of iterators available in SQLJ.

Short Answer

Expert verified

SQLJ is a standard for embedding SQL statements in Java code, used to facilitate easier handling of SQL tasks within Java programming. SQLJ provides two types of iterators: Named, based on user-defined types, and Positional, which access column values based on their position.

Step by step solution

Define SQLJ

SQLJ is a standard that enables the embedding of SQL statements in Java code. It allows for static type checking, better performance, and greater productivity of SQL code in Java programs.

Explain the Use of SQLJ

SQLJ is used to facilitate easier handling of SQL tasks within Java code. It makes it possible for SQL commands to be executed within the Java programming language. This assists developers in creating Java Database Connectivity(JDBC) applications without needing to hand code to prepare, parse, and execute SQL statements.

Describe the First Iterator

The first type of iterator available in SQLJ is Named iterator. Named iterations are based on user-defined types. Developers can define a type with attributes corresponding to the image of the query, and then use the type to define an iterator.

Describe the Second Iterator

The second type of iterator in SQLJ is Positional iterator. Unlike named iterators which use attribute names to access columns, positional iterators access column values based on their position. They don't use user-defined types; instead, column types and expressions from the SQL code are directly used as the iterator type specification.

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What is SQLJ used for? Describe the two types of iterators available in SQLJ.

Short Answer

Step by step solution

Define SQLJ

Explain the Use of SQLJ

Describe the First Iterator

Describe the Second Iterator

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