[Gdal-dev] ORACLE driver fails to fetch a VARCHAR2(4000) column

[Petteri Packalen]

Hi,

I encountered some problems when trying to convert ORACLE table to some
other format by using ogr2ogr. The table has a column of type
VARCHAR2(4000). There seems to be some sort of buffer problem relating
long text fields.

When I give a command like "ogr2ogr -f "ESRI Shapefile"
out_kohteet OCI:user/passw at db KOHTEET" I get a message "ERROR 1:
ORA-01406: fetched column value was truncated in OCIStmtFetch". The
shapefile is created but it is empty. I don't actually need this
VARCHAR2(4000) column. I know that the maximum length of the string in dbf
file is 254 characters. Anyway, it doesn't help if I try to restrict the
columns fetched by using the switch "-select". It still produces the same
error code. Also the geometry type in created shapefile is not correct
('line' instead of (2D) 'point'). I assume that in this case OGR first
fetches all columns from ORACLE and then internally retsricts which
columns are written to output file. The switch -sql "SELECT attr1, attr2,
..." fetches all attributes properly but the geometry type (and actual
geometries) is still wrong ('line' instead of (2D) 'point'). I assume that
in this case -sql statement is actually passed to ORACLE because it
doesn't produce the same error code.

Software versions are:
  GDAL 1.2.1.0, released 2004/06/23
  Oracle9i Release 9.2.0.4.0

Any hints how to work around the problem?

Best regards,
Petteri

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Petteri Packalén                   "There are two major products that
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