ResultSets The ResultSet interface provides access to the results generated by running queries. SQL statements cause the generation of ResultSet objects. This presentation aims to discuss:. 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. This procedure can significantly improve performance when many updates must be performed at once. This means that a single connection performs all the work of the transaction and that the connection can only work on one transaction at a time.
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Support is provided through public forums and mailing lists. 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. This procedure can significantly improve performance when many updates must be performed at once.
DB2 iSeries JDBC Drivers
Applications may also use DatabaseMetaData methods to obtain information about a data source, but this is less typical. By default, the table rows are retrieved in sequence. However, getting the best possible performance requires that you build your applications in a way that takes advantage of the strengths the native JDBC driver has to offer.
ResultSets The ResultSet interface iseriex access to the results generated by running queries. RowSet implementation providers have considerable freedom to define the functionality that is needed to fit their needs in a specific problem space. The following tips are considered good JDBC programming practice.
Java exceptions The Java language uses exceptions to provide error-handling capabilities for its 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. JDBC transactions A transaction is a logical unit of work. 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:.
Within a row, column values can jvbc accessed in any order.
Statement types The Statement interface and its PreparedStatement and CallableStatement subclasses are used to process structured query language SQL commands against the database. An exception is an event that occurs when you run your program that disrupts the normal flow of instructions.
It is used primarily by application servers and tools to determine how to interact with a given data source. All the same features as the previous article, but able to access any sort of database.
These Connection objects can all connect to the same database or connect to different databases. Database access from Java programs. Advanced data types Advanced SQL3 jrbc types give you a tremendous amount of flexibility. This driver is also commonly known as the native JDBC driver.
Example: Using native JDBC and IBM Toolbox for Java JDBC concurrently
Conceptually, data of a ResultSet can be thought of as a table with a specific number of columns and a specific number of rows. The RowSet interfaces define a set of core functionality that all RowSets have.
These settings are used for all connections created by the native JDBC driver. This means that a single connection performs all the work of the transaction and that the connection can only work on one transaction at a time.
Accessing your IBM i database with the Java JDBC driver
SQL statements cause the generation of ResultSet objects. This article takes what I learned from the earlier articles and attempts to combine it all into one. An application program can have multiple connections at one time. Since many objects used in JDBC are expensive to create such as Connection, Statement, and Iiseries objects, significant performance benefits can be achieved by reusing these objects instead of creating every time you need them.
To complete a logical unit of work, several actions may need to be taken against a database.
Batch updates Batch update support allows any updates to the database to be passed as a single transaction between the izeries program and the database. Most are not specific to the native JDBC driver. They 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.
I added support for handling Null database values to the JDBCR4 iaeries program, and described the new support in this article.