Download Database programming with JDBC and Java by George Reese PDF

By George Reese

Java and databases make a robust blend. Getting the 2 aspects to interact, besides the fact that, takes a few effort--largely simply because Java bargains in items whereas so much databases do not.

This booklet describes the normal Java interfaces that make moveable object-oriented entry to relational databases attainable and provides a strong version for writing functions which are effortless to take care of. It introduces the JDBC and RMI programs and makes use of them to improve three-tier functions (applications divided right into a person interface, an object-oriented common sense part, and a knowledge store).

The booklet starts off with a short evaluate of SQL for builders who will be requested to address a database for the 1st time. It then explains the right way to factor database queries and updates via SQL and JDBC. It additionally covers using kept tactics and different measures to enhance potency, the place those are available.

But the book's key contribution is a collection of styles that allow builders isolate serious projects like item construction, details garage and retrieval, and the committing or aborting of transactions.

The moment variation comprises extra fundamentals of JDBC and SQL, with extra examples, and a deeper dialogue concerning the structure of a strong, maintainable database program. the second one version additionally explains the connection among JDBC and company JavaBeans.

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You execute that prepared SQL statement multiple times inside the for() loop, but you build the query plan only a single time. Before each execution of the prepared statement, you tell JDBC which values to use as input for that execution of the statement. ResultSet. Just as the getXXX( ) methods read results according to the order in which you constructed your SQL, the setXXX() methods bind parameters from left to right in the page 48 JDBC and Java 2nd edition order you placed them in the prepared statement.

2. Generate a new, unique comment ID to serve as a primary key. 3. Insert the new comment into the database. 1 Getting parameter values Getting parameter values and validating them is nothing more than an exercise in servlet programming. For each field in the form, get its value and make sure that the value makes sense. For example, you want to make sure the email field has a valid email address and that the comment field is not null. 2 Generating a new comment ID page 45 JDBC and Java 2nd edition Almost every database engine has its own proprietary mechanism for generating unique IDs for a database table.

A negative number specifies absolute navigation backwards from the last row. Where absolute(1) is identical to first(), absolute(1) is identical to last(). Similarly, absolute(-3) is the third to last row in the ResultSet. If there are fewer than three rows in the ResultSet, then ResultSet is positioned before the first row. The relative() method handles relative navigation through a ResultSet. In other words, it tells the ResultSet how many rows to move forward or backward. A value of 1 behaves just like next( ) and a value of -1 just like previous().

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