1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/******************************************************************************
* $Id: ogridbselectlayer.cpp 10645 2007-01-18 02:22:39Z warmerdam $
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: Implements OGRIDBSelectLayer class, layer access to the results
* of a SELECT statement executed via Open()
* (based on ODBC and PG drivers).
* Author: Oleg Semykin, oleg.semykin@gmail.com
*
******************************************************************************
* Copyright (c) 2006, Oleg Semykin
*
* 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.
****************************************************************************/
#include "cpl_conv.h"
#include "ogr_idb.h"
CPL_CVSID("$Id: ogridbselectlayer.cpp 10645 2007-01-18 02:22:39Z warmerdam $");
/************************************************************************/
/* OGRIDBSelectLayer() */
/************************************************************************/
OGRIDBSelectLayer::OGRIDBSelectLayer( OGRIDBDataSource *poDSIn,
ITCursor * poCurrIn )
{
poDS = poDSIn;
iNextShapeId = 0;
nSRSId = -1;
poFeatureDefn = NULL;
poCurr = poCurrIn;
pszBaseQuery = CPLStrdup( poCurrIn->Command() );
BuildFeatureDefn( "SELECT", poCurr );
}
/************************************************************************/
/* ~OGRIDBSelectLayer() */
/************************************************************************/
OGRIDBSelectLayer::~OGRIDBSelectLayer()
{
ClearQuery();
}
/************************************************************************/
/* ClearQuery() */
/************************************************************************/
void OGRIDBSelectLayer::ClearQuery()
{
if( poCurr != NULL )
{
delete poCurr;
poCurr = NULL;
}
}
/************************************************************************/
/* GetQuery() */
/************************************************************************/
ITCursor *OGRIDBSelectLayer::GetQuery()
{
if( poCurr == NULL )
ResetQuery();
return poCurr;
}
/************************************************************************/
/* ResetQuery() */
/************************************************************************/
OGRErr OGRIDBSelectLayer::ResetQuery()
{
ClearQuery();
iNextShapeId = 0;
CPLDebug( "OGR_IDB", "Recreating statement." );
poCurr = new ITCursor( *poDS->GetConnection() );
if( poCurr->Prepare( pszBaseQuery ) &&
poCurr->Open( ITCursor::ReadOnly ) )
return OGRERR_NONE;
else
{
delete poCurr;
poCurr = NULL;
return OGRERR_FAILURE;
}
}
/************************************************************************/
/* ResetReading() */
/************************************************************************/
void OGRIDBSelectLayer::ResetReading()
{
if( iNextShapeId != 0 )
ClearQuery();
OGRIDBLayer::ResetReading();
}
/************************************************************************/
/* GetFeature() */
/************************************************************************/
OGRFeature *OGRIDBSelectLayer::GetFeature( long nFeatureId )
{
return OGRIDBLayer::GetFeature( nFeatureId );
}
/************************************************************************/
/* TestCapability() */
/************************************************************************/
int OGRIDBSelectLayer::TestCapability( const char * pszCap )
{
return OGRIDBLayer::TestCapability( pszCap );
}
/************************************************************************/
/* GetExtent() */
/* */
/* Since SELECT layers currently cannot ever have geometry, we */
/* can optimize the GetExtent() method! */
/************************************************************************/
OGRErr OGRIDBSelectLayer::GetExtent(OGREnvelope *, int )
{
return OGRERR_FAILURE;
}
/************************************************************************/
/* GetFeatureCount() */
/* */
/* If a spatial filter is in effect, we turn control over to */
/* the generic counter. Otherwise we return the total count. */
/* Eventually we should consider implementing a more efficient */
/* way of counting features matching a spatial query. */
/************************************************************************/
int OGRIDBSelectLayer::GetFeatureCount( int bForce )
{
return OGRIDBLayer::GetFeatureCount( bForce );
}
|
