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
|
//-----------------------------------------------------------------------------
// 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.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// DemoFetch.c
// Demos simple fetch of numbers and strings.
//-----------------------------------------------------------------------------
#include "SampleLib.h"
#define SQL_TEXT_1 "select IntCol, StringCol, RawCol, rowid " \
"from DemoStrings " \
"where IntCol > :intCol"
#define SQL_TEXT_2 "select IntCol " \
"from DemoStrings " \
"where rowid = :1"
#define BIND_NAME "intCol"
//-----------------------------------------------------------------------------
// main()
//-----------------------------------------------------------------------------
int main(int argc, char **argv)
{
dpiData *intColValue, *stringColValue, *rawColValue, *rowidValue;
uint32_t numQueryColumns, bufferRowIndex, i, rowidAsStringLength;
dpiData bindValue, *bindRowidValue;
dpiNativeTypeNum nativeTypeNum;
const char *rowidAsString;
dpiQueryInfo queryInfo;
dpiVar *rowidVar;
dpiStmt *stmt;
dpiConn *conn;
int found;
// connect to database
conn = dpiSamples_getConn(1, NULL);
// create variable for storing the rowid of one of the rows
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_ROWID, DPI_NATIVE_TYPE_ROWID, 1,
0, 0, 0, NULL, &rowidVar, &bindRowidValue) < 0)
return dpiSamples_showError();
// prepare and execute statement
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_1, strlen(SQL_TEXT_1), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
bindValue.value.asInt64 = 7;
bindValue.isNull = 0;
if (dpiStmt_bindValueByName(stmt, BIND_NAME, strlen(BIND_NAME),
DPI_NATIVE_TYPE_INT64, &bindValue) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
if (dpiStmt_defineValue(stmt, 1, DPI_ORACLE_TYPE_NUMBER,
DPI_NATIVE_TYPE_BYTES, 0, 0, NULL) < 0)
return dpiSamples_showError();
// fetch rows
printf("Fetch rows with IntCol > %" PRId64 "\n", bindValue.value.asInt64);
while (1) {
if (dpiStmt_fetch(stmt, &found, &bufferRowIndex) < 0)
return dpiSamples_showError();
if (!found)
break;
if (dpiStmt_getQueryValue(stmt, 1, &nativeTypeNum, &intColValue) < 0 ||
dpiStmt_getQueryValue(stmt, 2, &nativeTypeNum,
&stringColValue) < 0 ||
dpiStmt_getQueryValue(stmt, 3, &nativeTypeNum,
&rawColValue) < 0 ||
dpiStmt_getQueryValue(stmt, 4, &nativeTypeNum,
&rowidValue) < 0)
return dpiSamples_showError();
if (dpiRowid_getStringValue(rowidValue->value.asRowid,
&rowidAsString, &rowidAsStringLength) < 0)
return dpiSamples_showError();
printf("Row: Int = %.*s, String = '%.*s', Raw = '%.*s', "
"Rowid = '%.*s'\n", intColValue->value.asBytes.length,
intColValue->value.asBytes.ptr,
stringColValue->value.asBytes.length,
stringColValue->value.asBytes.ptr,
rawColValue->value.asBytes.length,
rawColValue->value.asBytes.ptr, rowidAsStringLength,
rowidAsString);
if (dpiVar_setFromRowid(rowidVar, 0, rowidValue->value.asRowid) < 0)
return dpiSamples_showError();
}
printf("\n");
// display description of each variable
printf("Display column metadata\n");
for (i = 0; i < numQueryColumns; i++) {
if (dpiStmt_getQueryInfo(stmt, i + 1, &queryInfo) < 0)
return dpiSamples_showError();
printf("('%*s', %d, %d, %d, %d, %d, %d)\n", queryInfo.nameLength,
queryInfo.name, queryInfo.typeInfo.oracleTypeNum,
queryInfo.typeInfo.sizeInChars,
queryInfo.typeInfo.clientSizeInBytes,
queryInfo.typeInfo.precision, queryInfo.typeInfo.scale,
queryInfo.nullOk);
}
printf("\n");
printf("Fetch rows with rowid = %.*s\n", rowidAsStringLength,
rowidAsString);
dpiStmt_release(stmt);
// prepare and execute statement to fetch by rowid
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_2, strlen(SQL_TEXT_2), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
if (dpiStmt_bindByPos(stmt, 1, rowidVar) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
// fetch rows
while (1) {
if (dpiStmt_fetch(stmt, &found, &bufferRowIndex) < 0)
return dpiSamples_showError();
if (!found)
break;
if (dpiStmt_getQueryValue(stmt, 1, &nativeTypeNum, &intColValue) < 0)
return dpiSamples_showError();
printf("Row: Int = %" PRId64 "\n", intColValue->value.asInt64);
}
// clean up
dpiVar_release(rowidVar);
dpiStmt_release(stmt);
dpiConn_release(conn);
printf("Done.\n");
return 0;
}
|
