# PostgreSQL SQL Dump

(GDAL/OGR >= 1.8.0)

This write-only driver implements support for generating a SQL dump file that can later be injected into a live PostgreSQL instance. It supports PostgreSQL extended with the PostGIS geometries.

This driver is very similar to the PostGIS shp2pgsql utility.

Most creation options are shared with the regular PostgreSQL driver.

The driver opens the output file through the VSIF Large API, so it is possible to specify /vsistdout/ as output file to output on the standard output.

## Creation options

### Dataset Creation Options

- LINEFORMAT: By default files are created with the line termination conventions of the local platform (CR/LF on win32 or LF on all other systems). This may be overridden through use of the LINEFORMAT layer creation option which may have a value of CRLF (DOS format) or LF (Unix format).

### Layer Creation Options

- GEOM_TYPE: The GEOM_TYPE layer creation option can be set to one of "geometry" or "geography" (PostGIS >= 1.5) to force the type of geometry used for a table. "geometry" is the default value.

- LAUNDER: This may be "YES" to force new fields created on this layer to have their field names "laundered" into a form more compatible with PostgreSQL. This converts to lower case and converts some special characters like "-" and "#" to "_". If "NO" exact names are preserved. The default value is "YES". If enabled the table (layer) name will also be laundered.

- PRECISION: This may be "YES" to force new fields created on this layer to try and represent the width and precision information, if available using NUMERIC(width,precision) or CHAR(width) types. If "NO" then the types FLOAT8, INTEGER and VARCHAR will be used instead. The default is "YES".

- DIM={2,3}: Control the dimension of the layer. Defaults to 3. Important to set to 2 for 2D layers with PostGIS 1.0+ as it has constraints on the geometry dimension during loading.

- GEOMETRY_NAME: Set name of geometry column in new table. If omitted it defaults to wkb_geometry for GEOM_TYPE=geometry, or the_geog for GEOM_TYPE=geography.

- SCHEMA: Set name of schema for new table. Using the same layer name in different schemas is supported, but not in the public schema and others.

- CREATE_SCHEMA: (OGR >= 1.8.1) To be used in combination with SCHEMA. Set to ON by default so that the CREATE SCHEMA instruction is emitted. Turn to OFF to prevent CREATE SCHEMA from being emitted.

- SPATIAL_INDEX: Set to ON by default. Creates a spatial index on the geometry column to speed up queries. Set to OFF to disable. (Has effect only when PostGIS is available).

- TEMPORARY: Set to OFF by default. Creates a temporary table instead of a permanent one.

- WRITE_EWKT_GEOM: Set to OFF by default. Turn to ON to write EWKT geometries instead of HEX geometries. This option will have no effect if PG_USE_COPY environment variable is to YES.

- CREATE_TABLE: Set to ON by default so that tables are recreated if necessary. Turn to OFF to disable this and use existing table structure.

- DROP_TABLE: (OGR >= 1.8.1) Set to ON by default so that tables are destroyed before being recreated. Set to OFF to prevent DROP TABLE from being emitted. Set to IF_EXISTS in order DROP TABLE IF EXISTS to be emitted (needs PostgreSQL >= 8.2)

- SRID: Set the SRID of the geometry. Defaults to -1, unless a SRS is associated with the layer. In the case, if the EPSG code is mentionned, it will be used as the SRID. (Note: the spatial_ref_sys table must be correctly populated with the specified SRID)

### Environment variables

- PG_USE_COPY: This may be "YES" for using COPY for inserting data to Postgresql. COPY is less robust than INSERT, but significantly faster.

### Example

- Simple translation of a shapefile into PostgreSQL into a file abc.sql. The table 'abc' will be created with the features from abc.shp and attributes from abc.dbf. The SRID is specified. PG_USE_COPY is set to YES to improve the peformance.

      % ogr2ogr --config PG_USE_COPY YES -f PGDump abc.sql abc.shp -lco SRID=32631

- Pipe the output of the PGDump driver into the psql utility.

      % ogr2ogr --config PG_USE_COPY YES -f PGDump /vsistdout/ abc.shp | psql -d my_dbname -f -

### See Also

- OGR PostgreSQL driver Page

- PostgreSQL Home Page

- PostGIS

- PostGIS / OGR Wiki Examples Page