#!/usr/bin/python3
###############################################################################
# $Id: load2odbc.py d7e898f6034a9c6c0f83cfbff921434dfc2082be 2018-04-18 23:07:52 +1000 Ben Elliston $
#
# Project:  OGR Python samples
# Purpose:  Load ODBC table to an ODBC datastore.  Uses direct SQL
#           since the ODBC driver is read-only for OGR.
# Author:   Frank Warmerdam, warmerdam@pobox.com
#
###############################################################################
# Copyright (c) 2005, Frank Warmerdam <warmerdam@pobox.com>
# Copyright (c) 2009, Even Rouault <even dot rouault at mines-paris dot org>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################

import sys

from osgeo import ogr

#############################################################################


def Usage():
    print('Usage: load2odbc.py [-where attr_filter] infile odbc_dsn layer')
    print('')
    sys.exit(1)

#############################################################################
# Argument processing.


extents_flag = 1
infile = None
odbc_dsn = None
layername = None
attr_filter = None

i = 1
while i < len(sys.argv):
    if sys.argv[i] == '-where':
        i = i + 1
        attr_filter = sys.argv[i]
    elif infile is None:
        infile = sys.argv[i]
    elif odbc_dsn is None:
        odbc_dsn = sys.argv[i]
    elif layername is None:
        layername = sys.argv[i]
    else:
        Usage()

    i = i + 1

if layername is None:
    Usage()

#############################################################################
# Open the datasource to operate on.

in_ds = ogr.Open(infile, update=0)

in_layer = in_ds.GetLayerByName(layername)

if in_layer is None:
    print('Did not find layer: ', layername)
    sys.exit(1)

if attr_filter is not None:
    in_layer.SetAttributeFilter(attr_filter)

#############################################################################
# Connect to ODBC DSN.

if odbc_dsn == 'stdout':
    out_ds = None
else:
    if len(odbc_dsn) < 6 or odbc_dsn[:5] != 'ODBC:':
        odbc_dsn = 'ODBC:' + odbc_dsn

    out_ds = ogr.Open(odbc_dsn)

    if out_ds is None:
        print('Unable to connect to ' + odbc_dsn)
        sys.exit(1)

#############################################################################
# Fetch layer definition, and defined output table on the same basis.

try:
    cmd = 'drop table ' + layername
    if out_ds is None:
        print(cmd)
    else:
        out_ds.ExecuteSQL(cmd)
except:
    pass

defn = in_layer.GetLayerDefn()

cmd = 'CREATE TABLE ' + layername + '( OGC_FID INTEGER, WKT_GEOMETRY MEMO'

if extents_flag:
    cmd = cmd + ', XMIN NUMBER, YMIN NUMBER, XMAX NUMBER, YMAX NUMBER'

for iField in range(defn.GetFieldCount()):
    fielddef = defn.GetFieldDefn(iField)
    cmd = cmd + ', ' + fielddef.GetName()
    if fielddef.GetType() == ogr.OFTInteger:
        cmd = cmd + ' INTEGER'
    elif fielddef.GetType() == ogr.OFTString:
        cmd = cmd + ' TEXT'
    elif fielddef.GetType() == ogr.OFTReal:
        cmd = cmd + ' NUMBER'
    else:
        cmd = cmd + ' TEXT'

cmd = cmd + ')'

if out_ds is None:
    print(cmd)
else:
    print('ExecuteSQL: ', cmd)
    result = out_ds.ExecuteSQL(cmd)
    if result is not None:
        out_ds.ReleaseResultSet(result)

#############################################################################
# Read all features in the line layer, holding just the geometry in a hash
# for fast lookup by TLID.

in_layer.ResetReading()
feat = in_layer.GetNextFeature()
while feat is not None:
    cmd_start = 'INSERT INTO ' + layername + ' ( OGC_FID '
    cmd_end = ') VALUES (%d' % feat.GetFID()

    geom = feat.GetGeometryRef()
    if geom is not None:
        cmd_start = cmd_start + ', WKT_GEOMETRY'
        cmd_end = cmd_end + ", '" + geom.ExportToWkt() + "'"

    if extents_flag and geom is not None:
        extent = geom.GetEnvelope()
        cmd_start = cmd_start + ', XMIN, XMAX, YMIN, YMAX'
        cmd_end = cmd_end + (', %.7f, %.7f, %.7f, %.7f' % extent)

    for iField in range(defn.GetFieldCount()):
        fielddef = defn.GetFieldDefn(iField)
        if feat.IsFieldSet(iField) != 0:
            cmd_start = cmd_start + ', ' + fielddef.GetName()

        if fielddef.GetType() == ogr.OFTInteger:
            cmd_end = cmd_end + ', ' + feat.GetFieldAsString(iField)
        elif fielddef.GetType() == ogr.OFTString:
            cmd_end = cmd_end + ", '" + feat.GetFieldAsString(iField) + "'"
        elif fielddef.GetType() == ogr.OFTReal:
            cmd_end = cmd_end + ', ' + feat.GetFieldAsString(iField)
        else:
            cmd_end = cmd_end + ", '" + feat.GetFieldAsString(iField) + "'"

    cmd = cmd_start + cmd_end + ')'

    if out_ds is None:
        print(cmd)
    else:
        print('ExecuteSQL: ', cmd)
        out_ds.ExecuteSQL(cmd)

    feat.Destroy()
    feat = in_layer.GetNextFeature()

#############################################################################
# Cleanup

in_ds.Destroy()
if out_ds is not None:
    out_ds.Destroy()