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This discussion is archived
: Jan 29, 2013 6:25 AM by
Invalid UPDATE generated by Oracle .net driver - ORA-00904
Jan 28, 2013 8:11 PM
I am trying to assist our developers with this issue:
We are planning to switch from MS driver for .Net to Oracle driver for .Net,
however Oracle .net driver sometimes generates invalid UPDATE.
This is how it works: we provide SELECT statement, let's say
SELECT A, B, C FROM TABLE_A WHERE ()
Oracle executes it and returns values A=A1, B=B1, C=C1.
The driver generates UPDATE statement that has all columns in the WHERE clause:
UPDATE TABLE_A SET C=C2 WHERE A=A1, B=B1, C=C1.
It works fine.
However if SELECT statement contains expression then sometimes invalid UPDATE gets generated. In simplified form:
SELECT A+B D,C FROM TABLE_A WHERE
.Net driver generates UPDATE statement
UPDATE TABLE_A SET C=C2 WHERE A=A1, B=B1, D=D1, C=C1.
As this table doesn't have column "D" the UPDATE fails with ORA-00904 "D" invalid identifier
It could be fixed by adding AS
SELECT A+B AS D,C FROM TABLE_A WHERE
This is complex app written some time ago, our preference is to avoid changing SQL.
We tried two versions: Oracle driver for .net 184.108.40.206 and 220.127.116.11.
Both have the same issue.
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Re: Invalid UPDATE generated by Oracle .net driver - ORA-00904
Jan 29, 2013 6:25 AM
in response to
What technology are you using to generate these queries?