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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
#include "connection.h"
#include "error.h"
#include "selectcommand.h"
#include "modifycommand.h"
#include <unistd.h>
#include <boost/assert.hpp>
NAMEDFACTORY("postgresql", PQ::Connection, DB::ConnectionFactory);
static void setup() __attribute__((constructor(101)));
static void setup()
{
BOOST_ASSERT(PQisthreadsafe() == 1);
PQinitOpenSSL(1, 0);
}
static void
noNoticeProcessor(void *, const char *)
{
}
PQ::Connection::Connection(const std::string & info) :
conn(PQconnectdb(info.c_str())),
txDepth(0),
pstmntNo(0),
rolledback(false)
{
if (PQstatus(conn) != CONNECTION_OK) {
throw ConnectionError(conn);
}
PQsetNoticeProcessor(conn, noNoticeProcessor, NULL);
}
PQ::Connection::~Connection()
{
PQfinish(conn);
}
void
PQ::Connection::finish() const
{
if (txDepth != 0) {
rollbackTx();
throw Error("Transaction still open");
}
}
int
PQ::Connection::beginTx() const
{
if (txDepth == 0) {
checkResultFree(PQexec(conn, "BEGIN"), PGRES_COMMAND_OK);
rolledback = false;
}
return ++txDepth;
}
int
PQ::Connection::commitTx() const
{
if (rolledback) {
return rollbackTx();
}
if (--txDepth == 0) {
checkResultFree(PQexec(conn, "COMMIT"), PGRES_COMMAND_OK);
}
return txDepth;
}
int
PQ::Connection::rollbackTx() const
{
if (--txDepth == 0) {
checkResultFree(PQexec(conn, "ROLLBACK"), PGRES_COMMAND_OK);
}
else {
rolledback = true;
}
return txDepth;
}
bool
PQ::Connection::inTx() const
{
return txDepth;
}
void
PQ::Connection::execute(const std::string & sql) const
{
checkResultFree(PQexec(conn, sql.c_str()), PGRES_COMMAND_OK, PGRES_TUPLES_OK);
}
DB::BulkDeleteStyle
PQ::Connection::bulkDeleteStyle() const
{
return DB::BulkDeleteUsingSubSelect;
}
DB::BulkUpdateStyle
PQ::Connection::bulkUpdateStyle() const
{
return DB::BulkUpdateUsingFromSrc;
}
void
PQ::Connection::ping() const
{
if (PQstatus(conn) != CONNECTION_OK) {
if (inTx()) {
throw ConnectionError(conn);
}
PQreset(conn);
if (PQstatus(conn) != CONNECTION_OK) {
throw ConnectionError(conn);
}
}
}
DB::SelectCommand *
PQ::Connection::newSelectCommand(const std::string & sql) const
{
return new SelectCommand(this, sql, pstmntNo++);
}
DB::ModifyCommand *
PQ::Connection::newModifyCommand(const std::string & sql) const
{
return new ModifyCommand(this, sql, pstmntNo++);
}
bool
PQ::Connection::checkResultInt(PGresult * res, int expected, int alt)
{
return (PQresultStatus(res) == expected) || (alt != -1 && (PQresultStatus(res) == alt));
}
PGresult *
PQ::Connection::checkResult(PGresult * res, int expected, int alt) const
{
if (!checkResultInt(res, expected, alt)) {
PQclear(res);
throw Error(PQerrorMessage(conn));
}
return res;
}
void
PQ::Connection::checkResultFree(PGresult * res, int expected, int alt) const
{
if (!checkResultInt(res, expected, alt)) {
PQclear(res);
throw Error(PQerrorMessage(conn));
}
PQclear(res);
}
void
PQ::Connection::beginBulkUpload(const char * table, const char * extra) const
{
char buf[BUFSIZ];
snprintf(buf, BUFSIZ, "COPY %s FROM STDIN %s", table, extra);
checkResultFree(PQexec(conn, buf), PGRES_COPY_IN);
}
void
PQ::Connection::endBulkUpload(const char * msg) const
{
switch (PQputCopyEnd(conn, msg)) {
case 0:// block
sleep(1);
endBulkUpload(msg);
return;
case 1:// success
checkResultFree(PQgetResult(conn), PGRES_COMMAND_OK);
return;
default:// -1 is error
throw Error(PQerrorMessage(conn));
}
}
size_t
PQ::Connection::bulkUploadData(const char * data, size_t len) const
{
switch (PQputCopyData(conn, data, len)) {
case 0:// block
sleep(1);
return bulkUploadData(data, len);
case 1:// success
return len;
default:// -1 is error
throw Error(PQerrorMessage(conn));
}
}
int64_t
PQ::Connection::insertId() const
{
SelectCommand getId(this, "SELECT lastval()", pstmntNo++);
int64_t id = -1;
while (getId.fetch()) {
getId[0] >> id;
}
return id;
}
|
