/** Creates a new Environment. */
void create(const char *filename, uint32_t flags = 0,
uint32_t mode = 0644, const ham_parameter_t *param = 0) {
ham_status_t st = ham_env_create(&m_env, filename, flags, mode, param);
if (st)
throw error(st);
}
int
main(int argc, char **argv) {
int i;
ham_status_t st; /* status variable */
ham_env_t *env; /* hamsterdb Environment object */
ham_db_t *db; /* hamsterdb Database object */
ham_key_t key = {0}; /* the structure for a key */
ham_record_t record = {0}; /* the structure for a record */
/*
* Connect to the server which should listen at 8080. The server is
* implemented in server1.c.
*/
st = ham_env_create(&env, "ham://localhost:8080/env1.db", 0, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_create", st);
/* now open a Database in this Environment */
st = ham_env_open_db(env, &db, 13, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_open_db", st);
/* now we can insert, delete or lookup values in the database */
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
record.size = key.size;
record.data = key.data;
st = ham_db_insert(db, 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_insert", st);
}
/* now lookup all values */
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
st = ham_db_find(db, 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_find", st);
/* check if the value is ok */
if (*(int *)record.data != i) {
printf("ham_db_find() ok, but returned bad value\n");
return (-1);
}
}
/* erase everything */
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
st = ham_db_erase(db, 0, &key, 0);
if (st != HAM_SUCCESS)
error("ham_db_erase", st);
}
/* and make sure that the database is empty */
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
st = ham_db_find(db, 0, &key, &record, 0);
if (st != HAM_KEY_NOT_FOUND)
error("ham_db_find", st);
}
/* close the database handle */
st = ham_db_close(db, 0);
if (st != HAM_SUCCESS)
error("ham_db_close", st);
/* close the environment handle */
st = ham_env_close(env, 0);
if (st != HAM_SUCCESS)
error("ham_env_close", st);
printf("success!\n");
return (0);
}
int
main(int argc, char **argv) {
int i;
ham_status_t st; /* status variable */
ham_db_t *db[MAX_DBS]; /* hamsterdb database objects */
ham_env_t *env; /* hamsterdb environment */
ham_cursor_t *cursor[MAX_DBS]; /* a cursor for each database */
ham_key_t key, cust_key, ord_key;
ham_record_t record, cust_record, ord_record;
customer_t customers[MAX_CUSTOMERS] = {
{ 1, "Alan Antonov Corp." },
{ 2, "Barry Broke Inc." },
{ 3, "Carl Caesar Lat." },
{ 4, "Doris Dove Brd." }
};
order_t orders[MAX_ORDERS] = {
{ 1, 1, "Joe" },
{ 2, 1, "Tom" },
{ 3, 3, "Joe" },
{ 4, 4, "Tom" },
{ 5, 3, "Ben" },
{ 6, 3, "Ben" },
{ 7, 4, "Chris" },
{ 8, 1, "Ben" }
};
memset(&key, 0, sizeof(key));
memset(&record, 0, sizeof(record));
memset(&cust_key, 0, sizeof(cust_key));
memset(&cust_record, 0, sizeof(cust_record));
memset(&ord_key, 0, sizeof(ord_key));
memset(&ord_record, 0, sizeof(ord_record));
/* Now create a new hamsterdb Environment */
st = ham_env_create(&env, "test.db", 0, 0664, 0);
if (st != HAM_SUCCESS)
error("ham_env_create", st);
/*
* Then create the two Databases in this Environment; each Database
* has a name - the first is our "customer" Database, the second
* is for the "orders"
*/
st = ham_env_create_db(env, &db[0], DBNAME_CUSTOMER, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_create_db (customer)", st);
st = ham_env_create_db(env, &db[1], DBNAME_ORDER, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_create_db (order)", st);
/* Create a Cursor for each Database */
for (i = 0; i < MAX_DBS; i++) {
st = ham_cursor_create(&cursor[i], db[i], 0, 0);
if (st != HAM_SUCCESS) {
printf("ham_cursor_create() failed with error %d\n", st);
return (-1);
}
}
/* Insert a few customers in the first database */
for (i = 0; i < MAX_CUSTOMERS; i++) {
key.size = sizeof(int);
key.data = &customers[i].id;
record.size = sizeof(customer_t);
record.data = &customers[i];
st = ham_db_insert(db[0], 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_insert (customer)", st);
}
/* And now the orders in the second database */
for (i = 0; i < MAX_ORDERS; i++) {
key.size = sizeof(int);
key.data = &orders[i].id;
record.size = sizeof(order_t);
record.data = &orders[i];
st = ham_db_insert(db[1], 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_insert (order)", st);
}
/*
* To demonstrate even more functions: close all objects, then
* re-open the environment and the two databases.
*
* Note that ham_env_close automatically calls ham_db_close on all
* databases.
*/
for (i = 0; i < MAX_DBS; i++) {
st = ham_cursor_close(cursor[i]);
if (st != HAM_SUCCESS)
error("ham_cursor_close", st);
}
st = ham_env_close(env, 0);
if (st != HAM_SUCCESS)
error("ham_env_close", st);
/* Now reopen the environment and the databases */
st = ham_env_open(&env, "test.db", 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_open", st);
st = ham_env_open_db(env, &db[0], DBNAME_CUSTOMER, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_open_db (customer)", st);
st = ham_env_open_db(env, &db[1], DBNAME_ORDER, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_open_db (order)", st);
/* Re-create a cursor for each database */
for (i = 0; i < MAX_DBS; i++) {
st = ham_cursor_create(&cursor[i], db[i], 0, 0);
if (st != HAM_SUCCESS) {
printf("ham_cursor_create() failed with error %d\n", st);
return (-1);
}
}
/*
* Now start the query - we want to dump each customer with his
* orders
*
* We have a loop with two cursors - the first cursor looping over
* the database with customers, the second loops over the orders.
*/
while (1) {
customer_t *customer;
st = ham_cursor_move(cursor[0], &cust_key, &cust_record,
HAM_CURSOR_NEXT);
if (st != HAM_SUCCESS) {
/* reached end of the database? */
if (st == HAM_KEY_NOT_FOUND)
break;
else
error("ham_cursor_next(customer)", st);
}
customer = (customer_t *)cust_record.data;
/* print the customer id and name */
printf("customer %d ('%s')\n", customer->id, customer->name);
/*
* The inner loop prints all orders of this customer. Move the
* cursor to the first entry.
*/
st = ham_cursor_move(cursor[1], &ord_key, &ord_record,
HAM_CURSOR_FIRST);
if (st != HAM_SUCCESS) {
/* reached end of the database? */
if (st == HAM_KEY_NOT_FOUND)
continue;
else
error("ham_cursor_next(order)", st);
}
do {
order_t *order = (order_t *)ord_record.data;
/* print this order, if it belongs to the current customer */
if (order->customer_id == customer->id)
printf(" order: %d (assigned to %s)\n",
order->id, order->assignee);
st = ham_cursor_move(cursor[1], &ord_key,
&ord_record, HAM_CURSOR_NEXT);
if (st != HAM_SUCCESS) {
/* reached end of the database? */
if (st == HAM_KEY_NOT_FOUND)
break;
else
error("ham_cursor_next(order)", st);
}
} while (1);
}
/*
* Now close the environment handle; the flag HAM_AUTO_CLEANUP will
* automatically close all databases and cursors
*/
st = ham_env_close(env, HAM_AUTO_CLEANUP);
if (st != HAM_SUCCESS)
error("ham_env_close", st);
printf("success!\n");
return (0);
}
int
main(int argc, char **argv) {
uint32_t i;
ham_status_t st; /* status variable */
ham_env_t *env; /* hamsterdb environment object */
ham_db_t *db; /* hamsterdb database object */
ham_key_t key = {0}; /* the structure for a key */
ham_record_t record = {0}; /* the structure for a record */
ham_parameter_t params[] = { /* parameters for ham_env_create_db */
{HAM_PARAM_KEY_TYPE, HAM_TYPE_UINT32},
{HAM_PARAM_RECORD_SIZE, sizeof(uint32_t)},
{0, }
};
/* First create a new hamsterdb Environment */
st = ham_env_create(&env, "test.db", 0, 0664, 0);
if (st != HAM_SUCCESS)
error("ham_create", st);
/* And in this Environment we create a new Database for uint32-keys
* and uint32-records. */
st = ham_env_create_db(env, &db, DATABASE_NAME, 0, ¶ms[0]);
if (st != HAM_SUCCESS)
error("ham_create", st);
/*
* now we can insert, delete or lookup values in the database
*
* for our test program, we just insert a few values, then look them
* up, then delete them and try to look them up again (which will fail).
*/
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
record.size = key.size;
record.data = key.data;
st = ham_db_insert(db, 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_insert", st);
}
/*
* now lookup all values
*
* for ham_db_find(), we could use the flag HAM_RECORD_USER_ALLOC, if WE
* allocate record.data (otherwise the memory is automatically allocated
* by hamsterdb)
*/
for (i = 0; i < LOOP; i++) {
key.data = &i;
key.size = sizeof(i);
st = ham_db_find(db, 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_find", st);
/*
* check if the value is ok
*/
if (*(int *)record.data != i) {
printf("ham_db_find() ok, but returned bad value\n");
return (-1);
}
}
/*
* close the database handle, then re-open it (to demonstrate how to open
* an Environment and a Database)
*/
st = ham_db_close(db, 0);
if (st != HAM_SUCCESS)
error("ham_db_close", st);
st = ham_env_close(env, 0);
if (st != HAM_SUCCESS)
error("ham_env_close", st);
st = ham_env_open(&env, "test.db", 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_open", st);
st = ham_env_open_db(env, &db, DATABASE_NAME, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_open_db", st);
/* now erase all values */
for (i = 0; i < LOOP; i++) {
key.size = sizeof(i);
key.data = &i;
st = ham_db_erase(db, 0, &key, 0);
if (st != HAM_SUCCESS)
error("ham_db_erase", st);
}
/*
* once more we try to find all values... every ham_db_find() call must
* now fail with HAM_KEY_NOT_FOUND
*/
for (i = 0; i < LOOP; i++) {
key.size = sizeof(i);
key.data = &i;
st = ham_db_find(db, 0, &key, &record, 0);
if (st != HAM_KEY_NOT_FOUND)
error("ham_db_find", st);
}
/* we're done! close the handles. HAM_AUTO_CLEANUP will also close the
* 'db' handle */
st = ham_env_close(env, HAM_AUTO_CLEANUP);
if (st != HAM_SUCCESS)
error("ham_env_close", st);
printf("success!\n");
return (0);
}
int
main(int argc, char **argv) {
int i;
ham_status_t st; /* status variable */
ham_db_t *db[MAX_DBS]; /* hamsterdb database objects */
ham_env_t *env; /* hamsterdb environment */
ham_cursor_t *cursor[MAX_DBS]; /* a cursor for each database */
ham_key_t key, cust_key, ord_key, c2o_key;
ham_record_t record, cust_record, ord_record, c2o_record;
customer_t customers[MAX_CUSTOMERS] = {
{ 1, "Alan Antonov Corp." },
{ 2, "Barry Broke Inc." },
{ 3, "Carl Caesar Lat." },
{ 4, "Doris Dove Brd." }
};
order_t orders[MAX_ORDERS] = {
{ 1, 1, "Joe" },
{ 2, 1, "Tom" },
{ 3, 3, "Joe" },
{ 4, 4, "Tom" },
{ 5, 3, "Ben" },
{ 6, 3, "Ben" },
{ 7, 4, "Chris" },
{ 8, 1, "Ben" }
};
memset(&key, 0, sizeof(key));
memset(&record, 0, sizeof(record));
memset(&cust_key, 0, sizeof(cust_key));
memset(&cust_record, 0, sizeof(cust_record));
memset(&ord_key, 0, sizeof(ord_key));
memset(&ord_record, 0, sizeof(ord_record));
memset(&c2o_key, 0, sizeof(c2o_key));
memset(&c2o_record, 0, sizeof(c2o_record));
/* Now create a new database file for the Environment */
st = ham_env_create(&env, "test.db", 0, 0664, 0);
if (st != HAM_SUCCESS)
error("ham_env_create", st);
/*
* Then create the two Databases in this Environment; each Database
* has a name - the first is our "customer" Database, the second
* is for the "orders"; the third manages our 1:n relation and
* therefore needs to enable duplicate keys
*/
st = ham_env_create_db(env, &db[DBIDX_CUSTOMER], DBNAME_CUSTOMER, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_create_db(customer)", st);
st = ham_env_create_db(env, &db[DBIDX_ORDER], DBNAME_ORDER, 0, 0);
if (st != HAM_SUCCESS)
error("ham_env_create_db(order)", st);
st = ham_env_create_db(env, &db[DBIDX_C2O], DBNAME_C2O,
HAM_ENABLE_DUPLICATES, 0);
if (st != HAM_SUCCESS)
error("ham_env_create_db(c2o)", st);
/* Create a Cursor for each Database */
for (i = 0; i < MAX_DBS; i++) {
st = ham_cursor_create(&cursor[i], db[i], 0, 0);
if (st != HAM_SUCCESS)
error("ham_cursor_create" , st);
}
/*
* Insert the customers in the customer table
*
* INSERT INTO customers VALUES (1, "Alan Antonov Corp.");
* INSERT INTO customers VALUES (2, "Barry Broke Inc.");
* etc
*/
for (i = 0; i < MAX_CUSTOMERS; i++) {
key.size = sizeof(int);
key.data = &customers[i].id;
record.size = sizeof(customer_t);
record.data = &customers[i];
st = ham_db_insert(db[0], 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_insert (customer)", st);
}
/*
* And now the orders in the second Database; contrary to env1,
* we only store the assignee, not the whole structure
*
* INSERT INTO orders VALUES (1, "Joe");
* INSERT INTO orders VALUES (2, "Tom");
*/
for (i = 0; i < MAX_ORDERS; i++) {
key.size = sizeof(int);
key.data = &orders[i].id;
record.size = sizeof(orders[i].assignee);
record.data = orders[i].assignee;
st = ham_db_insert(db[1], 0, &key, &record, 0);
if (st != HAM_SUCCESS)
error("ham_db_insert (order)", st);
}
/*
* And now the 1:n relationships; the flag HAM_DUPLICATE creates
* a duplicate key, if the key already exists
*
* INSERT INTO c2o VALUES (1, 1);
* INSERT INTO c2o VALUES (2, 1);
* etc
*/
for (i = 0; i < MAX_ORDERS; i++) {
key.size = sizeof(int);
key.data = &orders[i].customer_id;
record.size = sizeof(int);
record.data = &orders[i].id;
st = ham_db_insert(db[2], 0, &key, &record, HAM_DUPLICATE);
if (st != HAM_SUCCESS)
error("ham_db_insert(c2o)", st);
}
/*
* Now start the query - we want to dump each customer with his
* orders
*
* loop over the customer; for each customer, loop over the 1:n table
* and pick those orders with the customer id. then load the order
* and print it
*
* the outer loop is similar to:
* SELECT * FROM customers WHERE 1;
*/
while (1) {
customer_t *customer;
st = ham_cursor_move(cursor[0], &cust_key, &cust_record, HAM_CURSOR_NEXT);
if (st != HAM_SUCCESS) {
/* reached end of the database? */
if (st == HAM_KEY_NOT_FOUND)
break;
else
error("ham_cursor_next(customer)", st);
}
customer = (customer_t *)cust_record.data;
/* print the customer id and name */
printf("customer %d ('%s')\n", customer->id, customer->name);
/*
* loop over the 1:n table
*
* before we start the loop, we move the cursor to the
* first duplicate key
*
* SELECT * FROM customers, orders, c2o
* WHERE c2o.customer_id=customers.id AND
* c2o.order_id=orders.id;
*/
c2o_key.data = &customer->id;
c2o_key.size = sizeof(int);
st = ham_cursor_find(cursor[2], &c2o_key, 0, 0);
if (st != HAM_SUCCESS) {
if (st == HAM_KEY_NOT_FOUND)
continue;
error("ham_cursor_find(c2o)", st);
}
st = ham_cursor_move(cursor[2], 0, &c2o_record, 0);
if (st != HAM_SUCCESS)
error("ham_cursor_move(c2o)", st);
do {
int order_id;
order_id = *(int *)c2o_record.data;
ord_key.data = &order_id;
ord_key.size = sizeof(int);
/*
* load the order
* SELECT * FROM orders WHERE id = order_id;
*/
st = ham_db_find(db[1], 0, &ord_key, &ord_record, 0);
if (st != HAM_SUCCESS)
error("ham_db_find(order)", st);
printf(" order: %d (assigned to %s)\n",
order_id, (char *)ord_record.data);
/*
* The flag HAM_ONLY_DUPLICATES restricts the cursor
* movement to the duplicate list.
*/
st = ham_cursor_move(cursor[2], &c2o_key,
&c2o_record, HAM_CURSOR_NEXT|HAM_ONLY_DUPLICATES);
if (st != HAM_SUCCESS) {
/* reached end of the database? */
if (st == HAM_KEY_NOT_FOUND)
break;
else
error("ham_cursor_next(c2o)", st);
}
} while (1);
}
/*
* Now close the Environment handle; the flag
* HAM_AUTO_CLEANUP will automatically close all Databases and
* Cursors
*/
st = ham_env_close(env, HAM_AUTO_CLEANUP);
if (st != HAM_SUCCESS)
error("ham_env_close", st);
printf("success!\n");
return (0);
}
int
main(int argc, char **argv) {
ham_status_t st; /* status variable */
ham_env_t *env; /* hamsterdb environment object */
ham_db_t *db; /* hamsterdb database object */
ham_cursor_t *cursor; /* a database cursor */
char line[1024 * 4]; /* a buffer for reading lines */
ham_key_t key;
ham_record_t record;
memset(&key, 0, sizeof(key));
memset(&record, 0, sizeof(record));
printf("This sample uses hamsterdb to sort data.\n");
printf("Reading from stdin...\n");
/*
* Create a new hamsterdb Environment.
* We could create an In-Memory-Environment to speed up the sorting.
*/
st = ham_env_create(&env, "test.db", 0, 0664, 0);
if (st != HAM_SUCCESS) {
printf("ham_env_create() failed with error %d\n", st);
return (-1);
}
st = ham_env_create_db(env, &db, DATABASE_NAME,
HAM_ENABLE_EXTENDED_KEYS | HAM_ENABLE_DUPLICATES, 0);
if (st != HAM_SUCCESS) {
printf("ham_env_create_db() failed with error %d\n", st);
return (-1);
}
/*
* Since we use strings as our database keys we use our own comparison
* function based on strcmp instead of the default memcmp function.
*/
st = ham_db_set_compare_func(db, my_string_compare);
if (st) {
printf("ham_set_compare_func() failed with error %d\n", st);
return (-1);
}
/*
* Now read each line from stdin and split it in words; then each
* word is inserted into the database
*/
while (fgets(line, sizeof(line), stdin)) {
char *start = line, *p;
/*
* strtok is not the best function because it's not threadsafe
* and not flexible, but it's good enough for this example.
*/
while ((p = strtok(start, " \t\r\n"))) {
key.data = p;
key.size = (ham_size_t)strlen(p) + 1; /* also store the terminating
* 0-byte */
st = ham_db_insert(db, 0, &key, &record, 0);
if (st != HAM_SUCCESS && st!=HAM_DUPLICATE_KEY) {
printf("ham_db_insert() failed with error %d\n", st);
return (-1);
}
printf(".");
start = 0;
}
}
/* create a cursor */
st = ham_cursor_create(&cursor, db, 0, 0);
if (st != HAM_SUCCESS) {
printf("ham_cursor_create() failed with error %d\n", st);
return (-1);
}
/* iterate over all items with HAM_CURSOR_NEXT, and print the words */
while (1) {
st = ham_cursor_move(cursor, &key, &record, HAM_CURSOR_NEXT);
if (st != HAM_SUCCESS) {
/* reached end of the database? */
if (st == HAM_KEY_NOT_FOUND)
break;
else {
printf("ham_cursor_next() failed with error %d\n", st);
return (-1);
}
}
/* print the word */
printf("%s\n", (const char *)key.data);
}
/*
* Then close the handles; the flag HAM_AUTO_CLEANUP will automatically
* close all database and cursors, and we do not need to call
* ham_cursor_close and ham_db_close
*/
st = ham_env_close(env, HAM_AUTO_CLEANUP);
if (st != HAM_SUCCESS) {
printf("ham_env_close() failed with error %d\n", st);
return (-1);
}
/* success! */
return (0);
}