int OGRMSSQLSpatialTableLayer::FetchSRSId()
{
CPLODBCStatement oStatement = CPLODBCStatement( poDS->GetSession() );
oStatement.Appendf( "select srid from geometry_columns "
"where f_table_schema = '%s' and f_table_name = '%s'",
pszSchemaName, pszTableName );
if( oStatement.ExecuteSQL() && oStatement.Fetch() )
{
if ( oStatement.GetColData( 0 ) )
nSRSId = atoi( oStatement.GetColData( 0 ) );
}
return nSRSId;
}
CPLODBCStatement* OGRMSSQLSpatialTableLayer::BuildStatement(const char* pszColumns)
{
CPLODBCStatement* poStatement = new CPLODBCStatement( poDS->GetSession() );
poStatement->Append( "select " );
poStatement->Append( pszColumns );
poStatement->Append( " from " );
poStatement->Append( pszSchemaName );
poStatement->Append( "." );
poStatement->Append( pszTableName );
/* Append attribute query if we have it */
if( pszQuery != NULL )
poStatement->Appendf( " where (%s)", pszQuery );
/* If we have a spatial filter, query on it */
if ( m_poFilterGeom != NULL )
{
if (nGeomColumnType == MSSQLCOLTYPE_GEOMETRY
|| nGeomColumnType == MSSQLCOLTYPE_GEOGRAPHY)
{
if( pszQuery == NULL )
poStatement->Append( " where" );
else
poStatement->Append( " and" );
poStatement->Appendf(" [%s].STIntersects(", pszGeomColumn );
if (nGeomColumnType == MSSQLCOLTYPE_GEOGRAPHY)
poStatement->Append( "geography::" );
else
poStatement->Append( "geometry::" );
if ( m_sFilterEnvelope.MinX == m_sFilterEnvelope.MaxX ||
m_sFilterEnvelope.MinY == m_sFilterEnvelope.MaxY)
poStatement->Appendf("STGeomFromText('POINT(%.15g %.15g)',%d)) = 1",
m_sFilterEnvelope.MinX, m_sFilterEnvelope.MinY, nSRSId >= 0? nSRSId : 0);
else
poStatement->Appendf( "STGeomFromText('POLYGON((%.15g %.15g,%.15g %.15g,%.15g %.15g,%.15g %.15g,%.15g %.15g))',%d)) = 1",
m_sFilterEnvelope.MinX, m_sFilterEnvelope.MinY,
m_sFilterEnvelope.MaxX, m_sFilterEnvelope.MinY,
m_sFilterEnvelope.MaxX, m_sFilterEnvelope.MaxY,
m_sFilterEnvelope.MinX, m_sFilterEnvelope.MaxY,
m_sFilterEnvelope.MinX, m_sFilterEnvelope.MinY,
nSRSId >= 0? nSRSId : 0 );
}
else
{
CPLError( CE_Failure, CPLE_AppDefined,
"Spatial filter is supported only on geometry and geography column types." );
delete poStatement;
return NULL;
}
}
CPLDebug( "OGR_MSSQLSpatial", "ExecuteSQL(%s)", poStatement->GetCommand() );
if( poStatement->ExecuteSQL() )
return poStatement;
else
{
delete poStatement;
return NULL;
}
}
