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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "common.h"
void
printCurrentRow(HSTMT hstmt)
{
char buf[40];
int col;
SQLLEN ind;
int rc;
for (col = 1; col <= 2; col++)
{
rc = SQLGetData(hstmt, col, SQL_C_CHAR, buf, sizeof(buf), &ind);
if (!SQL_SUCCEEDED(rc))
{
print_diag("SQLGetData failed", SQL_HANDLE_STMT, hstmt);
exit(1);
}
if (ind == SQL_NULL_DATA)
strcpy(buf, "NULL");
printf("%s%s", (col > 1) ? "\t" : "", buf);
}
printf("\n");
}
int main(int argc, char **argv)
{
int rc;
HSTMT hstmt = SQL_NULL_HSTMT;
int i;
SQLUINTEGER cursor_type;
SQLINTEGER colvalue;
SQLLEN indColvalue;
test_connect();
rc = SQLAllocHandle(SQL_HANDLE_STMT, conn, &hstmt);
if (!SQL_SUCCEEDED(rc))
{
print_diag("failed to allocate stmt handle", SQL_HANDLE_DBC, conn);
exit(1);
}
/*
* Initialize a table with some test data.
*/
printf("Creating test table pos_update_test\n");
rc = SQLExecDirect(hstmt, (SQLCHAR *) "CREATE TEMPORARY TABLE pos_update_test(i int4, orig int4 primary key)", SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLExecDirect failed", hstmt);
rc = SQLExecDirect(hstmt, (SQLCHAR *) "INSERT INTO pos_update_test SELECT g, g FROM generate_series(1, 10) g", SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLExecDirect failed", hstmt);
rc = SQLFreeStmt(hstmt, SQL_CLOSE);
CHECK_STMT_RESULT(rc, "SQLFreeStmt failed", hstmt);
printf("Opening a cursor for update, and fetching 10 rows\n");
rc = SQLSetStmtAttr(hstmt, SQL_ATTR_CONCURRENCY,
(SQLPOINTER) SQL_CONCUR_ROWVER, 0);
CHECK_STMT_RESULT(rc, "SQLSetStmtAttr failed", hstmt);
rc = SQLSetStmtAttr(hstmt, SQL_ATTR_CURSOR_TYPE,
(SQLPOINTER) SQL_CURSOR_KEYSET_DRIVEN, 0);
CHECK_STMT_RESULT(rc, "SQLSetStmtAttr failed", hstmt);
rc = SQLBindCol(hstmt, 1, SQL_C_LONG, &colvalue, 0, &indColvalue);
CHECK_STMT_RESULT(rc, "SQLBindCol failed", hstmt);
rc = SQLExecDirect(hstmt, (SQLCHAR *) "SELECT * FROM pos_update_test ORDER BY orig", SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLExecDirect failed", hstmt);
rc = SQLGetStmtAttr(hstmt, SQL_ATTR_CURSOR_TYPE, (SQLPOINTER) &cursor_type, 0, NULL);
printf("exec cursor_type=%d\n", cursor_type);
for (i = 0; i < 5; i++)
{
rc = SQLFetch(hstmt);
if (rc == SQL_NO_DATA)
break;
if (rc == SQL_SUCCESS)
{
printCurrentRow(hstmt);
}
else
{
print_diag("SQLFetch failed", SQL_HANDLE_STMT, hstmt);
exit(1);
}
}
/* Do a positioned update and delete */
printf("\nUpdating result set\n");
colvalue += 50;
rc = SQLSetPos(hstmt, 1, SQL_UPDATE, SQL_LOCK_NO_CHANGE);
CHECK_STMT_RESULT(rc, "SQLSetPos 1st UPDATE failed", hstmt);
colvalue += 50;
rc = SQLSetPos(hstmt, 1, SQL_UPDATE, SQL_LOCK_NO_CHANGE);
CHECK_STMT_RESULT(rc, "SQLSetPos 2nd UPDATE failed", hstmt);
rc = SQLFetch(hstmt);
CHECK_STMT_RESULT(rc, "SQLFetch failed", hstmt);
rc = SQLSetPos(hstmt, 1, SQL_REFRESH, SQL_LOCK_NO_CHANGE);
CHECK_STMT_RESULT(rc, "SQLSetPos REFRESH failed", hstmt);
rc = SQLSetPos(hstmt, 1, SQL_DELETE, SQL_LOCK_NO_CHANGE);
CHECK_STMT_RESULT(rc, "SQLSetPos DELETE failed", hstmt);
/**** See if the updates are reflected in the still-open result set ***/
printf("\nRe-fetching the rows in the result set\n");
rc = SQLFetchScroll(hstmt, SQL_FETCH_RELATIVE, 0);
CHECK_STMT_RESULT(rc, "SQLFetchScroll failed", hstmt);
printCurrentRow(hstmt);
rc = SQLFetchScroll(hstmt, SQL_FETCH_PRIOR, -1);
CHECK_STMT_RESULT(rc, "SQLFetchScroll failed", hstmt);
printCurrentRow(hstmt);
rc = SQLFetchScroll(hstmt, SQL_FETCH_PRIOR, -1);
CHECK_STMT_RESULT(rc, "SQLFetchScroll failed", hstmt);
printCurrentRow(hstmt);
rc = SQLFreeStmt(hstmt, SQL_CLOSE);
CHECK_STMT_RESULT(rc, "SQLFreeStmt failed", hstmt);
/**** See if the updates really took effect ****/
printf("\nQuerying the table again\n");
rc = SQLExecDirect(hstmt, (SQLCHAR *) "SELECT * FROM pos_update_test ORDER BY orig", SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLExecDirect failed", hstmt);
print_result(hstmt);
rc = SQLFreeStmt(hstmt, SQL_CLOSE);
CHECK_STMT_RESULT(rc, "SQLFreeStmt failed", hstmt);
/*** Check that the code can deal with large keysets correctly.
*
* There was a bug in the reallocation in old driver versions.
*/
rc = SQLExecDirect(hstmt, (SQLCHAR *) "INSERT INTO pos_update_test SELECT g, g FROM generate_series(100, 5000) g", SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLExecDirect failed", hstmt);
rc = SQLFreeStmt(hstmt, SQL_CLOSE);
CHECK_STMT_RESULT(rc, "SQLFreeStmt failed", hstmt);
/*
* Set Fetch option, and create a new statement to reflect the new
* setting.
*/
{
SQLINTEGER fetch_val = 10000;
rc = SQLSetConnectAttr(conn,
65541, /* SQL_ATTR_PGOPT_FETCH */
&fetch_val,
SQL_IS_INTEGER);
CHECK_STMT_RESULT(rc, "SQLSetConnectAttr failed", hstmt);
}
rc = SQLAllocHandle(SQL_HANDLE_STMT, conn, &hstmt);
CHECK_CONN_RESULT(rc, "SQLAllocHandle failed", conn);
printf("\nOpening a cursor for update, and fetching 5000 rows\n");
rc = SQLSetStmtAttr(hstmt, SQL_ATTR_CONCURRENCY,
(SQLPOINTER) SQL_CONCUR_ROWVER, 0);
CHECK_STMT_RESULT(rc, "SQLSetStmtAttr failed", hstmt);
rc = SQLSetStmtAttr(hstmt, SQL_ATTR_CURSOR_TYPE,
(SQLPOINTER) SQL_CURSOR_KEYSET_DRIVEN, 0);
CHECK_STMT_RESULT(rc, "SQLSetStmtAttr failed", hstmt);
rc = SQLBindCol(hstmt, 1, SQL_C_LONG, &colvalue, 0, &indColvalue);
CHECK_STMT_RESULT(rc, "SQLBindCol failed", hstmt);
rc = SQLExecDirect(hstmt, (SQLCHAR *) "SELECT * FROM pos_update_test ORDER BY orig", SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLExecDirect failed", hstmt);
/* Clean up */
test_disconnect();
return 0;
}
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