It is used primarily by application servers and tools to determine how to interact with a given data source. This presentation aims to discuss:. Unlike some of the better-known interfaces of the JDBC specification, the RowSet specification is designed to be more of a framework than an actual implementation. Since many objects used in JDBC are expensive to create such as Connection, Statement, and ResultSet objects, significant performance benefits can be achieved by reusing these objects instead of creating every time you need them. Database access from Java programs. Sadly, the company who published these has taken them offline, so these links will not work. It is through Connection objects that Statement objects are created for processing SQL statements against the database.
|Date Added:||9 July 2005|
|File Size:||44.83 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
DB2 iSeries JDBC Drivers
Sadly, the company who published these has taken them offline, iiseries these links will not work. This procedure can significantly improve performance when many updates must be performed at once.
While previous articles showed how to access database columns fields by number, this article adds support for retriving the column values by name instead.
I added support for handling Null database values to the JDBCR4 service program, and described the new support in this article.
However, getting the best possible performance requires that you build your applications in a way that takes advantage of iserise strengths the native JDBC driver has to offer.
This presentation aims to discuss:. SQL statements cause the generation of ResultSet objects. Advanced data types Advanced SQL3 data types give you a tremendous amount of flexibility.
Within a row, column values can be accessed in any order. The RowSet interfaces define a set of core functionality that all RowSets have. This means that a single jdnc performs all the work of the transaction and that the connection can only work on one transaction at a time. Jxbc access from Java programs. JDBC provides a natural and easy-to-use mapping from the Java programming language to the abstractions and concepts defined in the SQL standard.
By default, the table rows are retrieved in sequence.
Unlike some of the better-known interfaces of the JDBC specification, the RowSet specification is designed to be more of a framework than an actual implementation.
Support is provided through public forums and mailing lists. Since many objects used in JDBC are expensive to create such as Connection, Statement, and ResultSet objects, significant performance benefits can be achieved by reusing these objects instead of iseres every time you need them.
To complete a logical unit of work, several actions may need to be taken against a database. Even if you’re not able to attend one of my talks, you can download a PDF copy of my Powerpoint sldes used as a handout for attendees here:.
DB2 iSeries JDBC Drivers configuration
These Connection objects can all connect to the same database or connect to different databases. JDBC transactions A transaction is a logical unit of work. Most are not specific to the native JDBC driver. ResultSets The ResultSet interface provides access to the results generated by running queries.
This is a community-supported product. Lseries are ideal for storing serialized Java objects, Extensible Markup Language XML documents, and multimedia data such as songs, product pictures, employee photographs, and movie clips.
RowSet implementation providers have considerable freedom to define the functionality that is needed to fit their needs in a specific problem space. Statement types The Statement interface and its PreparedStatement and CallableStatement subclasses are used to process structured query language SQL commands against the database. Batch updates Batch update support allows any updates to the database to be passed as a single transaction between the user program and the database.
It is used primarily by application servers and tools to determine how to interact with a given data source. Java exceptions The Java language uses exceptions to provide error-handling capabilities for its programs.
Applications may also use DatabaseMetaData methods to obtain information about a data source, but this is less typical. Iseeries is through Connection objects that Statement objects are created for processing SQL statements against the database.
These settings are used for all connections created by the native JDBC driver. An application program can have multiple connections at one time.
Accessing External Databases from RPG
Conceptually, data of a ResultSet can be thought of as a table with a specific number of columns and a specific number of rows. An exception is an event that occurs when you run mdbc program that disrupts the normal flow of instructions. All the same features as the previous article, but able to access any sort of database.