Java Oracle Database Development by David Gallardo

By David Gallardo

Java Database improvement with Oracle is a hands-on booklet for Java builders who are looking to find out how use Oracle and combine it with their Java functions. It assumes an intermediate wisdom of Java and no wisdom of Oracle. This booklet is segmented into 3 components. half One starts off through investigating how and why databases relate to object-oriented programming with Java. Introductory chapters at the Oracle database, SQL and different Oracle positive factors, together with its object-relational aid, lay the basis for the chapters that persist with. half offers thorough insurance of the basic Java applied sciences for database programming, with chapters on SQLJ, JDBC and JDO (Java info Objects). half 3 takes a higher-level view of program structure and considers the position of Oracle in company purposes, really in regards to EJB (Enterprise Java Beans) and the J2EE framework.

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In the first format we do not list the columns that we will be supplying values for. The values must exactly match the type and default order of all the columns in the table. We can find this out with the DESC command. 33 34 This is the result for the CD_COLLECTION table: SQL> DESC CD_COLLECTION Name ---------------------------------CD_ID ALBUM_TITLE ARTIST COUNTRY RELEASE_DATE LABEL Null? NEXTVAL, 'Doolittle', 'Pixies', 'USA', '1-JAN-1989', NULL); You may be wondering whether it is true that all the albums we've entered so far really have a release date of 1 January.

The commands to do this are: • SAVEPOINT savepoint_name Names a point to which we can selectively roll back a transaction. • ROLLBACK TO savepoint_name Rolls back a transaction to previously named SAVEPOINT. 56 57 This is not as generally useful as the basic COMMIT/ROLLBACK arrangement, but it allows creating a more sophisticated scheme for recovering from a partial failure while processing a transaction. For example, suppose that we have an application with a user interface that allows a user to enter the information for a CD.

When this feature is enabled, every SQL statement is automatically committed as it is entered. By default, auto-commit is off in SQL*Plus, so we can manually control a transaction by entering a sequence of SQL statements, then decide at the end whether 55 56 to call COMMIT or ROLLBACK. In other interfaces, we need to be aware of the default and change it if necessary to support transaction processing. In SQLJ, auto-commit is off by default. In JDBC, it is on by default, meaning that each SQL statement we send to the database is committed automatically; this is less efficient and less flexible than auto-commit.

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