IMS UNIVERSAL JDBC DRIVER

In Figure 4, the policy data can be interpreted as either a house or a car policy. PackedDateConverter that customers can use as a reference for writing their own converter. If there is a need to relate tables that are not along the same hierarchical path, there is another method available. This was done to illustrate how the ConverterFactory can help reduce the amount of code needed in the custom converters. In IMS it is possible to have a table where each row can vary in size. A database administrator is required to create the logical database. You are commenting using your Facebook account.

Uploader:	Mikat
Date Added:	2 October 2018
File Size:	50.6 Mb
Operating Systems:	Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads:	71340
Price:	Free* [*Free Regsitration Required]

The primary keys of a parent table then become the foreign kniversal for its child tables see Figure 1. The download site only maintains the most recent maintenance version of the driver for the newest IMS release.

IBM MAINFRAME: JDBC driver for connecting java with IMS

In order to deploy a custom converter, the DBA needs to update the catalog to reference the custom converter class for a given column. It is important for developers to find out which columns overlap as an update to one column will affect the value of the overlapping columns.

Read The Current Issue: With these programming considerations in mind, a Java application developer will know enough about IMS to quickly code applications that access IMS data. IMS is heavily used in most of the top finance and insurance companies where keyed searches are the norm.

If you would like to change your cookie settings at any time please view our privacy policy for additional information. IMS version 10 supports synchronous and asynchronous callout.

IBM Systems Magazine - Accessing IMS Data Through the JDBC API | mainframe | IBM Systems Magazine

IMS allows for logical databases that can define logical relationships between unrelated tables. IMS also allows support for custom data types.

For example, January 1,could be stored as a packed decimal value which would appear in hex as 0xc. While most data conversions are generally straightforward, IMS does allow for complex structures and arrays that can be nested many levels deep. PackedDateConverter that customers can use as a reference for writing their own converter.

This was the case in the previous scenario related to dynamic overlays. Most of the basic database concepts map on a one-to-one basis between the hierarchical model and the relational model, and some common terms can be used interchangeably see Table 1. This is done by having a control field defined where, depending on the value of the control field, a specific overlay is applied. A relational database would be better suited for queries relating multiple tables or for nested queries.

While columns may be defined anywhere within the byte buffer, it is possible for a given row to have a length value that defines a buffer size which do not encapsulate some of the column definitions.

In order to help customers write new custom converters, IMS provides a ConverterFactory class that can be used to instantiate basic converters, which the custom converter can leverage.

IMS Insiders

The converter themselves will need to be compiled and deployed in a location where it will be loaded by the same Java class loader that loads the IMS JDBC driver. He is involved in integrating IMS with other business solutions such as business analytics and reporting, content discovery and web enablement.

Because jbdc foreign keys do not physically exists in the child table, IMS will generate the name for the foreign keys with the following convention to avoid potential name bashing with other columns in a table:.

You are commenting using your WordPress. One of the main differences in how IMS stores key values can be seen in Figure 1 concerning the names of the foreign keys. The readObject implementation is provided in Code Sample 9.

Accessing IMS Data Through the JDBC API

You are commenting using your Facebook account. Custom data type converters can be written in Java by extending the com. This site uses cookies. In the sample, the ConverterFactory is used to instantiate a PackedDecimalTypeConverter that converts the packed decimal value to a BigDecimal data type.

The size of the row is determined by a two-byte length value that is stored in the first two bytes of the byte buffer. This is not the case with IMS. We use cookies to optimize your visit to our website. In Java, dates are stored as the number of jrbc since the epoch date of January 1, As mentioned in the previous section, hierarchical databases are not built for relating data between tables.