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Select Statement Using Dg4odbc Gateway To Postgres Not Showing Correct Data For Large Values (Doc ID 1263666.1)

Last updated on SEPTEMBER 27, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 to 11.2.0.2 [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Postgres
Openlink
Odbc
Dg4odbc
SQL*Plus


Symptoms


Selecting a number data type from a Postgres database using Database Gateway for ODBC (DG4ODBC) and the Postgres ODBC driver in some cases is returning incorrect data for very large values.

For example:

From Postgres, not using DG4ODBC -

select * from mytable where mynumber = 68

id1 |id2 |mynumber
-----------+-----------+-----------
20089 |188895 |68
20067 |188780 |68
21155 |193296 |68
21330 |194066 |68

result set 1 returned 4 rows.


From Oracle SQL*Plus using DG4ODBC -

SQL> select * from "mytable"@mydblink where "mynumber" = 68;
----------------------- ----------------------- -----------------------
86187108748921 810803926327775 292057776196
90860033166947 830199998636396 292057776196
91611652444835 833507123458832 292057776196
21330 194066 68


The Postgres columns are created as "integer NOT NULL"

A SQLPLUS describe shows the table as:

id1         NOT NULL NUMBER(10)
id2         NOT NULL NUMBER(10)
mynumber    NOT NULL NUMBER(10)


The odbc driver being used for the connection is the Openlink odbc driver.

Cause

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In this Document
Symptoms
Cause
Solution


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