public override void Init(int flowCount, long flowRecordCount)
{
string path = Path.Combine(DataDirectory, String.Format("{0}..hamster", CollectionName));
enviroment = new Hamster.Environment();
enviroment.Create(path, 0, 0664, new Parameter[] { GetCacheParam(CACHE_SIZE) });
database = enviroment.CreateDatabase((short)1, 0, new Parameter[] { GetKeySizeParam(8) });
}
public override void Init(int flowCount, long flowRecordCount)
{
string path = Path.Combine(DataDirectory, String.Format("{0}..hamster", CollectionName));
enviroment = new Hamster.Environment();
enviroment.Create(path, 0, 0664, new Parameter[] { GetCacheParam(CACHE_SIZE) });
database = enviroment.CreateDatabase((short)1, 0, new Parameter[] { GetKeySizeParam(8) });
}
public void AutoCleanupCursors()
{
Database db = new Database();
db.Create("ntest.db");
Cursor cursor = new Cursor(db);
// let gc do the cleanup
db.Close(HamConst.HAM_AUTO_CLEANUP);
}
public void AutoCleanupCursors4()
{
Database db = new Database();
db.Create("ntest.db");
Cursor cursor1 = new Cursor(db);
Cursor cursor2 = cursor1.Clone();
Cursor cursor3 = cursor1.Clone();
Cursor cursor4 = cursor1.Clone();
Cursor cursor5 = cursor1.Clone();
cursor3.Close();
cursor5.Close();
// let gc do the cleanup
db.Close(HamConst.HAM_AUTO_CLEANUP);
}
/// <summary>
/// Constructor which creates a new Cursor in a Transaction
/// </summary>
public Cursor(Database db, Transaction txn)
{
Create(db, txn);
}
/// <summary>
/// Creates a new Cursor in a Transaction
/// </summary>
/// <remarks>
/// This method wraps the native ham_cursor_create function.
/// <br />
/// Creates a new Database Cursor. Cursors can be used to traverse
/// the Database from start to end or vice versa. Cursors can also
/// be used to insert, delete or search Database items.
///
/// A newly created Cursor does not point to any item in the Database.
///
/// The application should close all Database Cursors before closing
/// the Database.
/// </remarks>
/// <param name="db">The Database object</param>
/// <param name="txn">The optional Transaction</param>
/// <exception cref="DatabaseException">
/// <list type="bullet">
/// <item><see cref="HamConst.HAM_OUT_OF_MEMORY"/>
/// if the new structure could not be allocated</item>
/// </list>
/// </exception>
public void Create(Database db, Transaction txn)
{
this.db = db;
lock (this.db) {
int st = NativeMethods.CursorCreate(out handle, db.Handle,
txn != null ? txn.Handle : IntPtr.Zero, 0);
if (st != 0)
throw new DatabaseException(st);
db.AddCursor(this);
}
}
/// <summary>
/// Closes the Cursor
/// </summary>
/// <remarks>
/// This method wraps the native ham_cursor_close function.
/// <br />
/// Closes this Cursor and frees allocated memory. All Cursors should
/// be closed before closing the Database.
/// </remarks>
public void Close()
{
if (handle == IntPtr.Zero)
return;
int st;
lock (db) {
st = NativeMethods.CursorClose(handle);
}
if (st != 0)
throw new DatabaseException(st);
handle = IntPtr.Zero;
db = null;
}
public void SetUp()
{
db = new Database();
db.Create("ntest.db", HamConst.HAM_ENABLE_DUPLICATES);
}
private void ApproxMatching()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k1 = new byte[5];
byte[] r1 = new byte[5];
k1[0] = 1; r1[0] = 1;
byte[] k2 = new byte[5];
byte[] r2 = new byte[5];
k2[0] = 2; r2[0] = 2;
byte[] k3 = new byte[5];
byte[] r3 = new byte[5];
k3[0] = 3; r3[0] = 3;
try
{
env.Create("ntest.db");
db = env.CreateDatabase(1);
db.Insert(k1, r1);
db.Insert(k2, r2);
db.Insert(k3, r3);
Cursor c = new Cursor(db);
byte[] r = c.Find(k2, HamConst.HAM_FIND_GT_MATCH);
checkEqual(r, r3);
checkEqual(k2, k3);
k2[0] = 2;
r = c.Find(k2, HamConst.HAM_FIND_GT_MATCH);
checkEqual(r, r1);
checkEqual(k2, k1);
db.Close();
env.Close();
}
catch (DatabaseException e)
{
Assert.Fail("unexpected exception " + e);
}
}
private void Recovery()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
env.Create("ntest.db", HamConst.HAM_ENABLE_RECOVERY);
db = env.CreateDatabase(1);
byte[] k = new byte[5];
byte[] r = new byte[5];
db.Insert(k, r);
db.Close();
env.Close();
}
private void EraseKeyTwice()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
byte[] r = new byte[5];
env.Create("ntest.db");
db = env.CreateDatabase(1);
db.Insert(k, r);
byte[] r2 = db.Find(k);
checkEqual(r, r2);
db.Erase(k);
try {
db.Erase(k);
}
catch (DatabaseException e) {
Assert.AreEqual(HamConst.HAM_KEY_NOT_FOUND, e.ErrorCode);
}
db.Close();
env.Close();
}
private void EraseKeyNegative()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
env.Create("ntest.db");
db = env.CreateDatabase(1);
try {
db.Erase(null);
}
catch (NullReferenceException) {
}
db.Close();
env.Close();
}
private void DatabaseClose()
{
Database db = new Database();
try {
db.Close();
}
catch (DatabaseException e) {
Assert.Fail("Unexpected exception " + e);
}
}
private void CreateStringIntIntParameterNeg()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
Parameter[] param = new Parameter[1];
param[0] = new Parameter();
param[0].name = HamConst.HAM_PARAM_CACHESIZE;
param[0].value = 1024;
try {
env.Create("ntest.db", HamConst.HAM_IN_MEMORY, 0644, param);
env.Close();
}
catch (DatabaseException e) {
Assert.AreEqual(HamConst.HAM_INV_PARAMETER, e.ErrorCode);
}
}
private void CreateStringIntIntParameter()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
Parameter[] param = new Parameter[1];
param[0] = new Parameter();
param[0].name = HamConst.HAM_PARAM_CACHESIZE;
param[0].value = 1024;
try {
env.Create("ntest.db", 0, 0644, param);
env.Close();
}
catch (DatabaseException e) {
Assert.Fail("Unexpected exception " + e);
}
}
private Database OpenDatabase(string file)
{
List<Parameter> list = new List<Parameter>();
Parameter param1 = new Parameter();
param1.name = HamConst.HAM_PARAM_CACHESIZE;
param1.value = 768 * 1024 * 1024;
list.Add(param1);
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
env.Open(file, 0, list.ToArray());
db = env.OpenDatabase(1);
db.SetCompareFunc(new CompareFunc(NumericalCompareFunc));
return db;
}
private void FindKeyNull()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
try {
env.Create("ntest.db");
db = env.CreateDatabase(1);
byte[] r = db.Find(null);
}
catch (NullReferenceException) {
}
db.Close();
env.Close();
}
private void SetComparator()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
byte[] r = new byte[5];
Parameter[] param = new Parameter[1];
param[0] = new Parameter();
param[0].name = HamConst.HAM_PARAM_KEY_TYPE;
param[0].value = HamConst.HAM_TYPE_CUSTOM;
compareCounter = 0;
try {
env.Create("ntest.db");
db = env.CreateDatabase(1, 0, param);
db.SetCompareFunc(new CompareFunc(MyCompareFunc));
db.Insert(k, r);
k[0] = 1;
db.Insert(k, r);
db.Close();
env.Close();
}
catch (DatabaseException e) {
Assert.Fail("unexpected exception " + e);
}
Assert.AreEqual(1, compareCounter);
}
private void FindUnknownKey()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
try {
env.Create("ntest.db");
db = env.CreateDatabase(1);
byte[] r = db.Find(k);
}
catch (DatabaseException e) {
Assert.AreEqual(HamConst.HAM_KEY_NOT_FOUND, e.ErrorCode);
}
db.Close();
env.Close();
}
private void SetUp()
{
env = new Hamster.Environment();
db = new Database();
env.Create("ntest.db");
db = env.CreateDatabase(1, HamConst.HAM_ENABLE_DUPLICATE_KEYS);
}
private void GetKeyCount()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
env.Create("ntest.db");
db = env.CreateDatabase(1);
byte[] k = new byte[5];
byte[] r = new byte[5];
Assert.AreEqual(0, db.GetKeyCount());
db.Insert(k, r);
Assert.AreEqual(1, db.GetKeyCount());
k[0] = 1;
db.Insert(k, r);
Assert.AreEqual(2, db.GetKeyCount());
db.Close();
env.Close();
}
static void Main(string[] args)
{
byte[] key = new byte[5];
byte[] record = new byte[5];
Database db = new Database();
/*
* first, create a new Database
*/
db.Create("test.db");
/*
* 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 (int i = 0; i < LOOP; i++) {
key[0] = (byte)i;
record[0] = (byte)i;
db.Insert(key, record);
}
/*
* now look up all values
*/
for (int i = 0; i < LOOP; i++) {
key[0] = (byte)i;
byte[] r = db.Find(key);
/*
* check if the value is ok
*/
if (r[0] != (byte)i) {
Console.Out.WriteLine("db.Find() returned bad value");
return;
}
}
/*
* close the Database handle, then re-open it (just to demonstrate how
* to open a Database file)
*/
db.Close();
db.Open("test.db");
/*
* now erase all values
*/
for (int i = 0; i < LOOP; i++) {
key[0] = (byte)i;
db.Erase(key);
}
/*
* once more we try to find all values... every db.Find() call must
* now fail with HAM_KEY_NOT_FOUND
*/
for (int i = 0; i < LOOP; i++) {
key[0] = (byte)i;
try {
byte[] r = db.Find(key);
}
catch (DatabaseException e) {
if (e.ErrorCode != HamConst.HAM_KEY_NOT_FOUND) {
Console.Out.WriteLine("db.Find() returned error " + e);
return;
}
}
}
/*
* We're done! No need to close the Database handle - it's closed automatically
*/
Console.Out.WriteLine("Success!");
}
private void InsertKey()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
byte[] r1 = new byte[5];
byte[] r2;
try {
env.Create("ntest.db");
db = env.CreateDatabase(1);
k[0] = 1;
r1[0] = 1;
db.Insert(k, r1);
r2 = db.Find(k);
checkEqual(r1, r2);
k[0] = 2;
r1[0] = 2;
db.Insert(k, r1);
r2 = db.Find(k);
checkEqual(r1, r2);
k[0] = 3;
r1[0] = 3;
db.Insert(k, r1);
r2 = db.Find(k);
checkEqual(r1, r2);
db.Close();
env.Close();
}
catch (DatabaseException e) {
Assert.Fail("unexpected exception " + e);
}
}
/// <summary>
/// Creates a new Cursor
/// </summary>
///
/// <see cref="Cursor.Create(Database, Transaction)" />
public void Create(Database db)
{
Create(db, null);
}
private void InsertKeyInvalidParam()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
byte[] r = new byte[5];
env.Create("ntest.db");
db = env.CreateDatabase(1);
try {
db.Insert(null, r);
}
catch (NullReferenceException) {
}
try {
db.Insert(k, null);
}
catch (NullReferenceException) {
}
try {
db.Insert(k, r, 9999);
}
catch (DatabaseException e) {
Assert.AreEqual(HamConst.HAM_INV_PARAMETER, e.ErrorCode);
}
db.Close();
env.Close();
}
/// <summary>
/// Constructor which creates a new Cursor
/// </summary>
/// <param name="db">The Database of this Cursor</param>
public Cursor(Database db)
{
Create(db);
}
private void InsertKeyNegative()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
byte[] r = new byte[5];
try {
env.Create("ntest.db");
db = env.CreateDatabase(1);
db.Insert(k, r);
db.Insert(k, r);
}
catch (DatabaseException e) {
Assert.AreEqual(HamConst.HAM_DUPLICATE_KEY, e.ErrorCode);
}
db.Close();
env.Close();
}
/// <summary>
/// Constructor which creates a new Cursor
/// </summary>
/// <param name="db">The Database of this Cursor</param>
/// <param name="handle">The handle of this Cursor</param>
internal Cursor(Database db, IntPtr handle)
{
this.db = db;
this.handle = handle;
}
private void InsertKeyOverwrite()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] k = new byte[5];
byte[] r = new byte[5];
try {
env.Create("ntest.db");
db = env.CreateDatabase(1);
db.Insert(k, r);
r[0] = 1;
db.Insert(k, r, HamConst.HAM_OVERWRITE);
byte[] r2 = db.Find(k);
checkEqual(r, r2);
db.Close();
env.Close();
}
catch (DatabaseException e) {
Assert.Fail("unexpected exception " + e);
}
}
static void Main(string[] args)
{
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
Hamster.Environment env = new Hamster.Environment();
Database[] db=new Database[3];
Cursor[] cursor=new Cursor[3];
/*
* set up the customer and order data - these arrays will later
* be inserted into the Databases
*/
Customer[] customers=new Customer[4];
customers[0] = new Customer(1, "Alan Antonov Corp.");
customers[1] = new Customer(2, "Barry Broke Inc.");
customers[2] = new Customer(3, "Carl Caesar Lat.");
customers[3] = new Customer(4, "Doris Dove Brd.");
Order[] orders = new Order[8];
orders[0] = new Order(1, 1, "Joe");
orders[1] = new Order(2, 1, "Tom");
orders[2] = new Order(3, 3, "Joe");
orders[3] = new Order(4, 4, "Tom");
orders[4] = new Order(5, 3, "Ben");
orders[5] = new Order(6, 3, "Ben");
orders[6] = new Order(7, 4, "Chris");
orders[7] = new Order(8, 1, "Ben");
/*
* Create a new Environment
*/
env.Create("test.db");
/*
* then create the three 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
*/
db[DBIDX_CUSTOMER] = env.CreateDatabase(DBNAME_CUSTOMER);
db[DBIDX_ORDER] = env.CreateDatabase(DBNAME_ORDER);
db[DBIDX_C2O] = env.CreateDatabase(DBNAME_C2O,
HamConst.HAM_ENABLE_DUPLICATES);
/*
* create a Cursor for each Database
*/
cursor[DBIDX_CUSTOMER] = new Cursor(db[DBIDX_CUSTOMER]);
cursor[DBIDX_ORDER] = new Cursor(db[DBIDX_ORDER]);
cursor[DBIDX_C2O] = new Cursor(db[DBIDX_C2O]);
/*
* Insert the customers in the customer Database
*
* INSERT INTO customers VALUES (1, "Alan Antonov Corp.");
* INSERT INTO customers VALUES (2, "Barry Broke Inc.");
* etc.
*/
for (int i = 0; i < customers.GetLength(0); i++) {
byte[] key = customers[i].GetKey();
byte[] rec = customers[i].GetRecord();
db[DBIDX_CUSTOMER].Insert(key, rec);
}
/*
* Insert the orders in the order Database
*
* INSERT INTO orders VALUES (1, "Joe");
* INSERT INTO orders VALUES (2, "Tom");
* etc.
*/
for (int i = 0; i < orders.GetLength(0); i++) {
byte[] key = orders[i].GetKey();
byte[] rec = orders[i].GetRecord();
db[DBIDX_ORDER].Insert(key, rec);
}
/*
* 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 (int i = 0; i < orders.GetLength(0); i++) {
byte[] key = orders[i].GetCustomerKey();
byte[] rec = orders[i].GetKey();
db[DBIDX_C2O].Insert(key, rec, HamConst.HAM_DUPLICATE);
}
/*
* now start the queries - we want to dump each customer and
* 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 == 1) {
Customer c;
try {
cursor[DBIDX_CUSTOMER].MoveNext();
}
catch (DatabaseException e) {
// reached end of Database?
if (e.ErrorCode == HamConst.HAM_KEY_NOT_FOUND)
break;
Console.Out.WriteLine("cursor.MoveNext failed: " + e);
return;
}
// load the customer
c = new Customer(cursor[DBIDX_CUSTOMER].GetKey(),
cursor[DBIDX_CUSTOMER].GetRecord());
// print information about this customer
Console.Out.WriteLine("customer " + c.id + " ('" + c.name + "')");
/*
* loop over the 1:n table
*
* SELECT * FROM customers, orders, c2o
* WHERE c2o.customer_id=customers.id AND
* c2o.order_id=orders.id;
*/
try {
cursor[DBIDX_C2O].Find(c.GetKey());
}
catch (DatabaseException e) {
// no order for this customer?
if (e.ErrorCode == HamConst.HAM_KEY_NOT_FOUND)
continue;
Console.Out.WriteLine("cursor.Find failed: " + e);
return;
}
do {
/*
* load the order; orderId is a byteArray with the ID of the
* Order; the record of the item is a byteArray with the
* name of the assigned employee
*
* SELECT * FROM orders WHERE id = order_id;
*/
byte[] orderId = cursor[DBIDX_C2O].GetRecord();
cursor[DBIDX_ORDER].Find(orderId);
String assignee = enc.GetString(cursor[DBIDX_ORDER].GetRecord());
Console.Out.WriteLine(" order: " + BitConverter.ToInt32(orderId, 0) +
" (assigned to " + assignee + ")");
/*
* move to the next order of this customer
*
* the flag HAM_ONLY_DUPLICATES restricts the cursor
* movement to the duplicates of the current key.
*/
try {
cursor[DBIDX_C2O].MoveNext(HamConst.HAM_ONLY_DUPLICATES);
}
catch (DatabaseException e) {
// no more orders for this customer?
if (e.ErrorCode == HamConst.HAM_KEY_NOT_FOUND)
break;
Console.Out.WriteLine("cursor.MoveNext failed: " + e);
return;
}
} while (1==1);
}
}
private void InsertRecNo()
{
Hamster.Environment env = new Hamster.Environment();
Database db = new Database();
byte[] r1 = new byte[5];
byte[] r2;
try
{
env.Create("ntest.db");
db = env.CreateDatabase(1, HamConst.HAM_RECORD_NUMBER);
r1[0] = 1;
var k = db.InsertRecNo(r1);
r2 = db.Find(k);
checkEqual(r1, r2);
r1[0] = 2;
k = db.InsertRecNo(r1);
r2 = db.Find(k);
checkEqual(r1, r2);
r1[0] = 3;
k = db.InsertRecNo(r1);
r2 = db.Find(k);
checkEqual(r1, r2);
}
catch (DatabaseException e)
{
Assert.Fail("unexpected exception " + e);
}
db.Close();
env.Close();
}
