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DI 12c's Mapping Designer - Combining Flow Based and Expression Based Mapping

y Madhu Nair on Oct 27, 2013

ost by David Allan

DI is renowned for itsdeclarative designer and minimal expression based paradigm. The new ODI 12c release has

tended this even further to provide an extended declarative mapping designer. The ODI 12c mapper is a fusion ofDI's new declarative designer with the familiar flow based designer while retaining ODIs key differentiators of:

Minimal expression based definition,

The ability to incrementally design an interface and to extract/load data from any combination of sources, and most

importantly

Backed by ODIs extensible knowledge module framework.

he declarative nature of the product has been extended to include an extensible library of common components that can

e used to easily build simple to complex data integration solutions. Big usability improvements through consistent

teractions of components and concepts all constructed around the familiar knowledge module framework provide the

most flexibility.

ereis a little taster:

o what is a mapping? A mapping comprises of a logical design and at least one physical design, it may have many. A

apping can have many targets, of any technology and can be arbitrarily complex. You can build reusable mappings and

e them in other mappings or other reusable mappings.

the example below all of the information from an Oracle bonus table and a bonus file are joined with an Oraclemployees table before being written to a target. Some things that are cool include the one-click expression cross

ferencing so you can easily see what's used where within the design.

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he logical design in a mapping describes whatyou want to accomplish (see the animated GIF hereillustrating how the

ove mapping was designed) . The physical design lets you configure howit is to be accomplished. So you could have

ne logical design that is realized as an initial load in one physical design and as an incremental load in another. In the

hysical design below we can customize how the mapping is accomplished by picking Knowledge Modules, in ODI 12c

ou can pick multiple nodes (on logical or physical) and see common properties. This is useful as we can quickly

mpare property values across objects - below we can see knowledge modules settings on the access points between

ecution units side by side, in the example one table is retrieved via database links and the other is an external table.

the logical design I had selected an append mode for the integration type, so by default the IKM on the target will

https://blogs.oracle.com/warehousebuilder/resource/ODI12c/odi_12c_logical_designer.gif

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oose the most suitable/default IKM - which in this case is an in-built Oracle Insert IKM (see image below). This

pports insert and select hints for the Oracle database (the ANSI SQL Insert IKM does not support these), so by

fault you will get direct path inserts with Oracle on this statement.

ODI 12c, the mapper is just that, a mapper. Design your mapping, write to multiple targets, the targets can be in the

me data server, in different data servers or in totally different technologies - it does not matter. ODI 12c will derive and

nerate a plan that you can use or customize with knowledge modules. Some of the use cases which are greatly

mplified include multiple heterogeneous targets, multi target inserts for Oracle and writing of XML.

et's switch it up now and look at a slightly different example to illustrate expression reuse. In ODI you can define

usable expressions using user functions. These can be reused across mappings and the implementations specialized per

chnology. So you can have common expressions across Oracle, SQL Server, Hive etc. shielding the design from the

hysical aspects of the generated language. Another way to reuse is within a mapping itself. In ODI 12c expressions can

e defined and reused within a mapping. Rather than replicating the expression text in larger expressions you can

compose into smaller snippets, below you can see UNIT_TAX AMOUNT has been defined and is used in two

ownstream target columns - its used in the TOTAL_TAX_AMOUNT plus its used in the UNIT_TAX_AMOUNT (a

cording of the calculation).

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ou can see the columns that the expressions depend on (upstream) and the columns the expression is used in

ownstream) highlighted within the mapper. Also multi selecting attributes is a convenient way to see what's being used

here, below I have selected the TOTAL_TAX_AMOUNT in the target datastore and the UNIT_TAX_AMOUNT in

NIT_CALC.

ou can now see many expressions at once now and understand much more at the once time without needlessly clicking

ound and memorizing information.

ur mantra during development was to keep it simple and make the tool more powerful and do even more for the user.

he development team was a fusion of many teams from Oracle Warehouse Builder, Sunopsis and BEA Aqualogic,

bating and perfecting the mapper in ODI 12c. This was quite a project from supporting the capabilities of ODI in 11g

building the flow based mapping tool to support the future.

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hope this was a useful insight, there is so much more to come on this topic, this is just a preview of much more that you

ill see of the mapper in ODI 12c.

ategory: ODI Technical Feature Overviews

ags: data_integrationetlodiodi-eeodi12codiee

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