Access Tables in an Informix Database that have their table names in lower

Question

Any help greatly appreciated!
Thanks

Answer 1

dear Frank,
check if helps oss note 520496 mentioned in doc
'Transferring Data with DB Connect'
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/2f0fea94-0501-0010-829c-d6b5c2ae5e40
we are using db connect but never with informix.
hope this helps.
520496-BW 3.0 external DB Connect after INFORMIX
Symptom
You want to connect an external Informix database to a BW Release greater than 3.0A in the form of a source system via an external Database Connect. This note describes the following:
prerequisites to be met
problems that can occur
which of these problems can be solved.
Other terms
Rsdbc, DATES, TIMES, DBCON, DBCONNECT, source system, database, InfoSource, DataSource
Reason and Prerequisites
1. General
2. Supported BW / Basis versions
3. Possible main problem areas
a) Conventions and notation
b) Use of data types
c) Code page and sort sequence of the source system
1. General
               Implementing the above function enables you to load data into a BW system from any Informix database. Unlike an Informix database delivered by SAP AG, you can configure this database as you like. This can cause constellations where an external DB access cannot be used directly. For most of these scenarios, a satisfactory customer-specific solution can be developed. However, the consulting expenses associated with this solution are not part of the normal support and are settled separately. A certain level of expertise and experience in using the source database (Informix in this case) is required to set up this connection, especially in the areas
DB-specific tools
DB-specific SQLSyntax
DB-specific function
               Knowledge of the source application is also required for transferring semantically-relevant data to the BW system.
Solution
1. Supported BW/Basis versions
              BW 3.0B   Basis 6. 20 Support Package 21
1. Possible main problem areas
a) Conventions and notation
            The DB connect interface in BW always expects capitalized table and field names. Since table and column names are usually written in lower case in Informix, access to an external table must be enabled via a view on the (external) Informix database. Field and table names must be entered in upper case in the view (enclose in quotation marks; environment variable DELIMIDENT must be set).
           Another advantage of the view is that access rights to the external table can be adjusted accordingly for the new requests. The view should be created as follows:
create view "<VIEWNAME>" ("<FIELD1>", "<FIELD2>"..)
as select
  <field1>, <field2>....
from <tabname>;
a) Use of data types
            In the case of SAP installations, the DB data type DATE and DATETIME are not used. Date and time are stored by the DDIC as character-like data types on the database. These date types therefore cannot be copied to the BW consistently without additional activities.
           Solution:
            You must create a view in the source system view which transforms the date types. DATE must be converted to an CHAR8 field (date) and DATETIME to an CHAR8 field (date) and a CHAR10 field (time):
create view "<VIEWNAME>" ("<FIELD1>")
as select
  substring ( to_char(<date_field>,'%Y%m%d) from 1 for 8 )
from <tabname>;
create view "<VIEWNAME>" ("<FIELD1>", "<FIELD2>")
as select
  substring ( to_char(<datetime_field>,'%r) from 1 for 2 ) ||
  substring ( to_char(<datetime_field>,'%r) from 4 for 2 ) ||
  substring ( to_char(<datetime_field>,'%r) from 7 for 2 ) ||
  '0000'
from <tabname>;  #
            Informix and ABAP support a value range of 1x10E-307 to 1x10E+308 for the 'float' data type. Limits may apply in the case of other databases. Before transferring 'float' data types to BW, you should therefore check the permissible value range on the target database.
a) Code page and sort sequence of the source system
               R/3 kernel based systems like BW are configured so that the database used is created with code page cp850 and the sort sequence 'bin'. The configuration of the source system may deviate from this.
               If the sort sequence is different, operations for pattern search ( like ) and area search ( between, >, < ) for character-like fields may return different results. No solution is currently available for this problem.
               The use of multibyte code pages in the source system for storing character sets with more than 256 characters ( Kanji, Hiragana, Korean, Chinese etc.) can cause inaccuracies in the data. No solution is currently available for this problem.