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
|
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2021 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef POSTGIS_CURSORRESULTSET_HPP
#define POSTGIS_CURSORRESULTSET_HPP
#include <mapnik/debug.hpp>
#include "connection.hpp"
#include "resultset.hpp"
class CursorResultSet : public IResultSet, private mapnik::util::noncopyable
{
public:
CursorResultSet(std::shared_ptr<Connection> const &conn, std::string cursorName, int fetch_count)
: conn_(conn),
cursorName_(cursorName),
fetch_size_(fetch_count),
is_closed_(false)
{
getNextResultSet();
}
virtual ~CursorResultSet()
{
close();
}
virtual void close()
{
if (!is_closed_)
{
rs_.reset();
std::ostringstream s;
s << "CLOSE " << cursorName_;
MAPNIK_LOG_DEBUG(postgis) << "postgis_cursor_resultset: " << s.str();
conn_->execute(s.str());
is_closed_ = true;
conn_.reset();
}
}
virtual int getNumFields() const
{
return rs_->getNumFields();
}
virtual bool next()
{
if (rs_->next()) {
return true;
} else if (rs_->size() == 0) {
close();
return false;
} else {
getNextResultSet();
return rs_->next();
}
}
virtual const char* getFieldName(int index) const
{
return rs_->getFieldName(index);
}
virtual int getFieldLength(int index) const
{
return rs_->getFieldLength(index);
}
virtual int getFieldLength(const char* name) const
{
return rs_->getFieldLength(name);
}
virtual int getTypeOID(int index) const
{
return rs_->getTypeOID(index);
}
virtual int getTypeOID(const char* name) const
{
return rs_->getTypeOID(name);
}
virtual bool isNull(int index) const
{
return rs_->isNull(index);
}
virtual const char* getValue(int index) const
{
return rs_->getValue(index);
}
virtual const char* getValue(const char* name) const
{
return rs_->getValue(name);
}
private:
void getNextResultSet()
{
std::ostringstream s;
s << "FETCH FORWARD " << fetch_size_ << " FROM " << cursorName_;
MAPNIK_LOG_DEBUG(postgis) << "postgis_cursor_resultset: " << s.str();
rs_ = conn_->executeQuery(s.str());
is_closed_ = false;
MAPNIK_LOG_DEBUG(postgis) << "postgis_cursor_resultset: FETCH result (" << cursorName_ << "): " << rs_->size() << " rows";
}
std::shared_ptr<Connection> conn_;
std::string cursorName_;
std::shared_ptr<ResultSet> rs_;
int fetch_size_;
bool is_closed_;
};
#endif // POSTGIS_CURSORRESULTSET_HPP
|
