Providing Query statement in JDBC adapter

HI experts,
Everybody knows we can provide Query to JDBC adapter by two ways...
1st way is by constructing query as XML structure..
2nd way is by giving exact query (Select * from tablename )by SQL_query in access ...
I like to know the performance of these two ways...
Regards,
Sasitharan

In XI version 3.0 there is only one way to do lookups - manually in the form of an exit in the mapping process. A user exits must be written in Java.
There are a couple of considerations about performance that must be kept in mind besides just the question of SQL Statement while implementing a database lookup using a JDBC adapter:
1.     The mechanism for database lookup
There are 2 approaches Direct, Indirect
In Direct approach you poll the external table hence this may lock database for access to other users, also it is an intrusive approach. In indirect approach database table is replicated and the replicated table is accessed. The second approach is recommended for performance reasons.
2.     Does the data to be looked up change frequently
If data does not change frequently than pull in data and keep a copy locally as this will improve performance
      2. It is possible to access an external database from within the mapping step of XI utilizing
A.     regular JDBC constructs
B.     utilization of J2EE JDBC Connector
Approach 2 is recommended as it is more efficient because of Connection pools.
There is no concept or need to XML code here. The Java code that executes the lookup, would call the sql statement, this java code can be referenced from within a user-defined function in the graphical mapper or from within XSLT.
Hence you need SQL statement in J2ee JDBC Connector to get the best performance.
Refer to URL
http://searchsap.techtarget.com/tip/0,289483,sid21_gci1246926,00.html#
to understadn how to configure the JDBC Connector Service to perform database lookups
Let me know if this helps.

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Hi,
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http://help.sap.com/saphelp_nw04/helpdata/en/7e/5df96381ec72468a00815dd80f8b63/content.htm
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Anil,
Did you check your Data Type is created correctly ?
And check the link, I have provided.
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Providing Query statement in JDBC adapter

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