[gdal-dev] How to use TRUNCATE lco with Oracle Spatial driver

[Aileen Heal]

Can any one provide an example of how to use the TRUNCATE lco for the
Oracle Spatial driver.

According to the docs.

TRUNCATE: This may be "YES" to force the existing table to be reused, but
to first truncate all records in the table, preserving indexes or
dependencies.

Which is exactly what I want, but every time I try to use it I get warnings
or errors.

e.g. First create a simple table.

ogr2ogr -overwrite -s_srs "EPSG:27700" -t_srs "EPSG:27700" -f OCI
OCI:xxxxx/xxxx at XE PG:"dbname=postgis active_schema=planning host=localhost
user=yyyy password=yyyy" open_country -lco LAUNDER=yes -lco
GEOMETRY_NAME=GEOLOC -nln open_country3

so I tried using append with TRUNCATE lco.

ogr2ogr -append -s_srs "EPSG:27700" -t_srs "EPSG:27700" -f OCI
OCI::xxxxx/xxxx at XE PG:"dbname=postgis active_schema=planning host=localhost
user=yyyy password=yyyy!" open_country -nln open_country3 -lco TRUNCATE=yes

which resulted in the the following
WARNING: Layer creation options ignored since an existing layer is being
appended to.

The data is appended and the table is not truncated.

So I tried this:

ogr2ogr -overwrite -s_srs "EPSG:27700" -t_srs "EPSG:27700" -f OCI
OCI:xxxxx/xxxx at XE PG:"dbname=postgis active_schema=planning host=localhost
user=yyyy password=yyyy" open_country -lco LAUNDER=yes -lco
GEOMETRY_NAME=GEOLOC -lco TRUNCATE=yes -nln open_country3

and I get the following errors

ERROR 1: ORA-00942: table or view does not exist in TRUNCATE TABLE
"OPEN_COUNTRY3"

ERROR 1: ORA-04043: object OPEN_COUNTRY3 does not exist in OCIDescribeAny

ERROR 1: ORA-04043: object "OPEN_COUNTRY3" does not exist in OCIDescribeAny

ERROR 1: ORA-04043: object "OPEN_COUNTRY3" does not exist in OCIDescribeAny

ERROR 1: ORA-04043: object "OPEN_COUNTRY3" does not exist in OCIDescribeAny

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "DISPLAYNAM" VARCHAR2(150)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "POLICY_REF" VARCHAR2(100)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "LAYER_NO" NUMBER(10)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "AREA_HA" NUMBER(24,15)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "TEXT_REF" VARCHAR2(20)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "LAYER_NAME" VARCHAR2(50)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "SETTLEMENT" VARCHAR2(40)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "NO_UNITS" NUMBER(10)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "MI_STYLE" VARCHAR2(254)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "MI_PRINX" NUMBER(10)

ERROR 1: ORA-00942: table or view does not exist in ALTER TABLE
OPEN_COUNTRY3 ADD "DISPLAYNAME" VARCHAR2(150)

So it appears the -overwrite is dropping the table and then trying to
truncate it hence the errors.

So I try this

ogr2ogr -s_srs "EPSG:27700" -t_srs "EPSG:27700" -f OCI OCI::xxxxx/xxxx at XE
PG:"dbname=postgis active_schema=planning host=localhost user=yyyy
password=yyyy" open_country -nln open_country3 -lco TRUNCATE=yes

And I get the following.

FAILED: Layer open_country3 already exists, and -append not specified.

Consider using -append, or -overwrite.

ERROR 1: Terminating translation prematurely after failed

translation of layer open_country (use -skipfailures to skip errors)

Not sure what to try next.

TIA

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