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
|
//-----------------------------------------------------------------------------
// Copyright (c) 2016, 2022, Oracle and/or its affiliates.
//
// This software is dual-licensed to you under the Universal Permissive License
// (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
// 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
// either license.
//
// If you elect to accept the software under the Apache License, Version 2.0,
// the following applies:
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// DemoInOutTempLobs.c
// Demos whether temporary LOBs passed to a PL/SQL procedure are processed
// correctly without leaks.
//-----------------------------------------------------------------------------
#include "SampleLib.h"
#define SQL_TEXT_1 "begin pkg_DemoLOBs." \
"DemoInOutTempClob(:1, :2); end;"
#define SQL_TEXT_2 "select sid from v$session " \
"where audsid = userenv('sessionid')"
#define SQL_TEXT_3 "select cache_lobs, nocache_lobs, " \
"abstract_lobs " \
"from v$temporary_lobs " \
"where sid = :sid"
#define LOB_TEXT "This is but a demo!"
//-----------------------------------------------------------------------------
// GetNumTempLobs()
// Calculate and print the number of temporary LOBs for the current session.
//-----------------------------------------------------------------------------
int GetNumTempLobs(dpiConn *conn, int64_t sid)
{
dpiData *cacheLobsData, *nocacheLobsData, *abstractLobsData, *sidData;
dpiVar *cacheLobsVar, *nocacheLobsVar, *abstractLobsVar, *sidVar;
uint32_t numQueryColumns, bufferRowIndex;
dpiStmt *stmt;
int found;
// prepare and execute statement
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_3, strlen(SQL_TEXT_3), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &sidVar, &sidData) < 0)
return dpiSamples_showError();
sidData->value.asInt64 = sid;
sidData->isNull = 0;
if (dpiStmt_bindByPos(stmt, 1, sidVar) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
dpiVar_release(sidVar);
// fetch row from database
if (dpiStmt_setFetchArraySize(stmt, 1) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &cacheLobsVar, &cacheLobsData) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &nocacheLobsVar, &nocacheLobsData) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &abstractLobsVar, &abstractLobsData) < 0)
return dpiSamples_showError();
if (dpiStmt_define(stmt, 1, cacheLobsVar) < 0)
return dpiSamples_showError();
if (dpiStmt_define(stmt, 2, nocacheLobsVar) < 0)
return dpiSamples_showError();
if (dpiStmt_define(stmt, 3, abstractLobsVar) < 0)
return dpiSamples_showError();
if (dpiStmt_fetch(stmt, &found, &bufferRowIndex) < 0)
return dpiSamples_showError();
if (!found) {
fprintf(stderr, "No row found for sid %" PRId64 "!\n", sid);
return -1;
}
// display result and clean up
printf("Temporary LOBS: cache: %" PRId64 ", nocache: %" PRId64
", abstract: %" PRId64 "\n", cacheLobsData->value.asInt64,
nocacheLobsData->value.asInt64, abstractLobsData->value.asInt64);
dpiVar_release(cacheLobsVar);
dpiVar_release(nocacheLobsVar);
dpiVar_release(abstractLobsVar);
dpiStmt_release(stmt);
return 0;
}
//-----------------------------------------------------------------------------
// main()
//-----------------------------------------------------------------------------
int main(int argc, char **argv)
{
uint32_t numQueryColumns, bufferRowIndex;
dpiData *sidValue, *lobValue, *intValue;
dpiVar *sidVar, *lobVar, *intVar;
dpiStmt *stmt;
dpiConn *conn;
uint64_t sid;
dpiLob *lob;
int found;
// connect to database
conn = dpiSamples_getConn(0, NULL);
// fetch SID
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_2, strlen(SQL_TEXT_2), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &sidVar, &sidValue) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
if (dpiStmt_setFetchArraySize(stmt, 1) < 0)
return dpiSamples_showError();
if (dpiStmt_define(stmt, 1, sidVar) < 0)
return dpiSamples_showError();
if (dpiStmt_fetch(stmt, &found, &bufferRowIndex) < 0)
return dpiSamples_showError();
if (!found) {
fprintf(stderr, "No row found for current session!?\n");
return -1;
}
sid = sidValue->value.asInt64;
dpiVar_release(sidVar);
dpiStmt_release(stmt);
printf("SID of current session is %" PRId64 "\n", sid);
// display the number of temporary LOBs at this point (should be 0)
if (GetNumTempLobs(conn, sid) < 0)
return -1;
// create new temporary LOB and populate it
if (dpiConn_newTempLob(conn, DPI_ORACLE_TYPE_CLOB, &lob) < 0)
return dpiSamples_showError();
if (dpiLob_setFromBytes(lob, LOB_TEXT, strlen(LOB_TEXT)) < 0)
return dpiSamples_showError();
// display the number of temporary LOBs at this point (should be 1)
if (GetNumTempLobs(conn, sid) < 0)
return -1;
// prepare bind variables
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &intVar, &intValue) < 0)
return dpiSamples_showError();
intValue->isNull = 0;
intValue->value.asInt64 = 1;
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_CLOB, DPI_NATIVE_TYPE_LOB, 1, 0,
0, 0, NULL, &lobVar, &lobValue) < 0)
return dpiSamples_showError();
if (dpiVar_setFromLob(lobVar, 0, lob) < 0)
return dpiSamples_showError();
// call stored procedure
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_1, strlen(SQL_TEXT_1), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
if (dpiStmt_bindByPos(stmt, 1, intVar) < 0)
return dpiSamples_showError();
if (dpiStmt_bindByPos(stmt, 2, lobVar) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
if (dpiConn_commit(conn) < 0)
return dpiSamples_showError();
dpiStmt_release(stmt);
dpiVar_release(intVar);
dpiVar_release(lobVar);
dpiLob_release(lob);
// display the number of temporary LOBs at this point (should be 0)
if (GetNumTempLobs(conn, sid) < 0)
return -1;
// clean up
dpiConn_release(conn);
printf("Done.\n");
return 0;
}
|
