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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
#include <stdio.h>
#include <sql.h>
#include <sqlext.h>
#define ROWS 20
#define STATUS_LEN 6
#define OPENDATE_LEN 11
#define DONE -1
int res[][ 3 ] =
{
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_PRIOR, 0, 0 },
{ SQL_FETCH_FIRST, 0, 0 },
{ SQL_FETCH_ABSOLUTE, -100, 0 },
{ SQL_FETCH_ABSOLUTE, -400, 0 },
{ SQL_FETCH_ABSOLUTE, 200, 0 },
{ SQL_FETCH_ABSOLUTE, 350, 0 },
{ SQL_FETCH_LAST, 0, 0 },
{ SQL_FETCH_NEXT, 0, 0 },
{ SQL_FETCH_LAST, 0, 0 },
{ SQL_FETCH_FIRST, 0, 0 },
{ SQL_FETCH_RELATIVE, 20, 0 },
{ SQL_FETCH_RELATIVE, 50, 0 },
{ SQL_FETCH_RELATIVE, 101, 0 },
{ SQL_FETCH_RELATIVE, -5, 0 },
{ SQL_FETCH_RELATIVE, 60, 0 },
{ SQL_FETCH_RELATIVE, -60, 0 },
{ SQL_FETCH_RELATIVE, 0, 0 },
{ SQL_FETCH_RELATIVE, 0, 0 },
{ SQL_FETCH_NEXT, 0, -1 },
};
int PromptScroll( SQLUINTEGER *ort, SQLUINTEGER *offset )
{
static int count = 0;
int ret;
*ort = res[ count ][ 0 ];
*offset = res[ count ][ 1 ];
ret = res[ count ][ 2 ];
count ++;
return ret;
}
int DumpODBCLog( SQLHENV hEnv, SQLHDBC hDbc, SQLHSTMT hStmt )
{
SQLCHAR szError[501];
SQLCHAR szSqlState[10];
SQLINTEGER nNativeError;
SQLSMALLINT nErrorMsg;
if ( hStmt )
{
while ( SQLError( hEnv, hDbc, hStmt, szSqlState, &nNativeError, szError, 500, &nErrorMsg ) == SQL_SUCCESS )
{
printf( "%s\n", szError );
}
}
if ( hDbc )
{
while ( SQLError( hEnv, hDbc, 0, szSqlState, &nNativeError, szError, 500, &nErrorMsg ) == SQL_SUCCESS )
{
printf( "%s\n", szError );
}
}
if ( hEnv )
{
while ( SQLError( hEnv, 0, 0, szSqlState, &nNativeError, szError, 500, &nErrorMsg ) == SQL_SUCCESS )
{
printf( "%s\n", szError );
}
}
return 1;
}
static int Display( SQLUSMALLINT *rsa, SQLUINTEGER crow,
SQLSMALLINT *sOrderID, SQLINTEGER *cbOrderID,
SQLCHAR szOrderDate[][OPENDATE_LEN], SQLINTEGER *cbOrderDate,
SQLCHAR szStatus[][STATUS_LEN], SQLINTEGER *cbStatus )
{
int i;
printf( "crow = %d\n", crow );
for ( i = 0; i < crow; i ++ )
{
printf( "%d %d |%d:%d|%s:%d|%s:%d\n", i,
rsa[ i ], sOrderID[ i ], cbOrderID[ i ],
szOrderDate[ i ], cbOrderDate[ i ],
szStatus[ i ], cbStatus[ i ] );
}
}
void create_file( SQLHANDLE hstmt )
{
SQLRETURN ret;
int i;
ret = SQLExecDirect( hstmt, "drop table ctest", SQL_NTS );
ret = SQLExecDirect( hstmt, "create table ctest ( id integer, dt character( 10 ), status character( 5 ), other character varying( 40 ))", SQL_NTS );
for ( i = 1; i < 1000; i ++ )
{
char sql[ 256 ];
sprintf( sql, "insert into ctest values( %d, '%10d', '%05d', 'other line %d' )", i, i, i, i );
ret = SQLExecDirect( hstmt, sql, SQL_NTS );
printf( "%s - %d\n", sql, ret );
}
}
void cursor_test()
{
SQLHENV henv;
SQLHDBC hdbc;
SQLHSTMT hstmt1, hstmt2;
SQLRETURN retcode;
SQLCHAR szStatus[ROWS][STATUS_LEN], szOpenDate[ROWS][OPENDATE_LEN];
SQLCHAR szNewStatus[STATUS_LEN], szNewOpenDate[OPENDATE_LEN];
SQLSMALLINT sOrderID[ROWS], sNewOrderID[ROWS];
SQLINTEGER cbStatus[ROWS], cbOrderID[ROWS], cbOpenDate[ROWS];
SQLUINTEGER FetchOrientation, crow, FetchOffset, irowUpdt;
SQLUSMALLINT RowStatusArray[ROWS];
SQLAllocHandle( SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv );
SQLSetEnvAttr( henv, SQL_ATTR_ODBC_VERSION, SQL_OV_ODBC3, 0 );
SQLAllocHandle( SQL_HANDLE_DBC, henv, &hdbc );
/* Specify the ODBC Cursor Library is always used then connect. */
SQLSetConnectAttr( hdbc, SQL_ATTR_ODBC_CURSORS, SQL_CUR_USE_ODBC, 0 );
retcode = SQLConnect( hdbc, "postgres", SQL_NTS,
"", SQL_NTS,
"", SQL_NTS );
DumpODBCLog( NULL, hdbc, NULL );
if ( retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO )
{
/* Allocate a statement handle for the result set and a statement */
/* handle for a positioned update statement */
SQLAllocHandle( SQL_HANDLE_STMT, hdbc, &hstmt1 );
SQLAllocHandle( SQL_HANDLE_STMT, hdbc, &hstmt2 );
/*
* create the data
*/
create_file( hstmt1 );
/* Specify an updateable statis cursor with 20 rows of data. Set */
/* the cursor name, execute the SELECT statement, and bind the */
/* rowset buffer to result set columns in column-wise fashion */
SQLSetStmtAttr( hstmt1, SQL_ATTR_CONCURRENCY, SQL_CONCUR_VALUES, 0 );
SQLSetStmtAttr( hstmt1, SQL_ATTR_CURSOR_TYPE, SQL_CURSOR_STATIC, 0 );
SQLSetStmtAttr( hstmt1, SQL_ATTR_ROW_ARRAY_SIZE, ROWS, 20 );
SQLSetStmtAttr( hstmt1, SQL_ATTR_ROW_STATUS_PTR, RowStatusArray, 0 );
SQLSetStmtAttr( hstmt1, SQL_ATTR_ROWS_FETCHED_PTR, &crow, 0 );
SQLSetCursorName( hstmt1, "ORDERCURSOR", SQL_NTS );
SQLPrepare( hstmt1,
"select id, dt, status from ctest",
SQL_NTS );
{
char cname[ 30 ];
retcode = SQLDescribeCol( hstmt1, 1, cname, sizeof( cname ),
NULL, NULL, NULL, NULL, NULL );
printf( "ret = %d %s\n", retcode, cname );
DumpODBCLog( NULL, NULL, hstmt1 );
}
SQLExecute( hstmt1 );
SQLBindCol( hstmt1, 1, SQL_C_SSHORT, sOrderID, 0, cbOrderID );
SQLBindCol( hstmt1, 2, SQL_C_CHAR, szOpenDate, OPENDATE_LEN, cbOpenDate );
SQLBindCol( hstmt1, 3, SQL_C_CHAR, szStatus, STATUS_LEN, cbStatus );
FetchOrientation = SQL_FETCH_FIRST;
FetchOffset = 0;
do
{
int ret;
int count;
printf( "fetch %d %d\n", FetchOrientation, FetchOffset );
ret = SQLFetchScroll( hstmt1,
FetchOrientation,
FetchOffset );
SQLRowCount( hstmt1, &count );
printf( "ret = %d count = %d\n", ret, count );
Display( RowStatusArray, crow, sOrderID, cbOrderID,
szOpenDate, cbOpenDate, szStatus, cbStatus );
if ( SQL_SUCCEEDED( ret ))
{
char txt[ 50 ];
SQLINTEGER len;
ret = SQLSetPos( hstmt1, 5, SQL_POSITION,
SQL_LOCK_NO_CHANGE );
ret = SQLGetData( hstmt1, 2, SQL_C_CHAR, txt, sizeof( txt ),
&len );
printf( "ret = %d %s:%d\n", ret, txt, len );
}
} while( PromptScroll( &FetchOrientation, &FetchOffset ) != DONE );
SQLCloseCursor( hstmt1 );
SQLFreeStmt( hstmt1, SQL_DROP );
SQLFreeStmt( hstmt2, SQL_DROP );
SQLDisconnect( hdbc );
SQLFreeHandle( SQL_HANDLE_DBC, hdbc );
}
SQLFreeHandle( SQL_HANDLE_ENV, henv );
}
int main()
{
cursor_test();
}
|
