KeyValuePair <DatabaseEntry, MultipleDatabaseEntry> GetBothMultiple(
DatabaseEntry key, DatabaseEntry data,
int BufferSize, Transaction txn, LockingInfo info)
{
KeyValuePair <DatabaseEntry, DatabaseEntry> kvp;
int datasz = (int)data.Data.Length;
for (; ;)
{
byte[] udata = new byte[BufferSize];
Array.Copy(data.Data, udata, datasz);
data.UserData = udata;
data.size = (uint)datasz;
try {
kvp = Get(key, data, txn, info,
DbConstants.DB_MULTIPLE | DbConstants.DB_GET_BOTH);
break;
} catch (MemoryException) {
int sz = (int)data.size;
if (sz > BufferSize)
{
BufferSize = sz;
}
else
{
BufferSize *= 2;
}
}
}
MultipleDatabaseEntry dbe = new MultipleDatabaseEntry(kvp.Value);
return(new KeyValuePair <DatabaseEntry, MultipleDatabaseEntry>(
kvp.Key, dbe));
}
/// <summary>
/// Retrieve a specific numbered key and all duplicate data items from
/// the database.
/// </summary>
/// <param name="recno">
/// The record number of the record to be retrieved.
/// </param>
/// <param name="BufferSize">
/// The initial size of the buffer to fill with duplicate data items. If
/// the buffer is not large enough, it is automatically resized.
/// </param>
/// <param name="txn">
/// <paramref name="txn"/> is a Transaction object returned from
/// <see cref="DatabaseEnvironment.BeginTransaction"/>; if
/// the operation is part of a Berkeley DB Concurrent Data Store group,
/// <paramref name="txn"/> is a handle returned from
/// <see cref="DatabaseEnvironment.BeginCDSGroup"/>; otherwise null.
/// </param>
/// <param name="info">The locking behavior to use.</param>
/// <exception cref="NotFoundException">
/// A NotFoundException is thrown if <paramref name="recno"/> is not in
/// the database.
/// </exception>
/// <returns>
/// A <see cref="KeyValuePair{T,T}"/> whose Key parameter is
/// <paramref name="recno"/> and whose Value parameter is the retrieved
/// data items.
/// </returns>
public KeyValuePair <DatabaseEntry, MultipleDatabaseEntry> GetMultiple(
uint recno, int BufferSize, Transaction txn, LockingInfo info)
{
KeyValuePair <DatabaseEntry, DatabaseEntry> kvp;
DatabaseEntry key = new DatabaseEntry();
key.Data = BitConverter.GetBytes(recno);
DatabaseEntry data = new DatabaseEntry();
for (; ;)
{
data.UserData = new byte[BufferSize];
try {
kvp = Get(key, data, txn, info,
DbConstants.DB_MULTIPLE | DbConstants.DB_SET_RECNO);
break;
} catch (MemoryException) {
int sz = (int)data.size;
if (sz > BufferSize)
{
BufferSize = sz;
}
else
{
BufferSize *= 2;
}
}
}
MultipleDatabaseEntry dbe = new MultipleDatabaseEntry(kvp.Value);
return(new KeyValuePair <DatabaseEntry, MultipleDatabaseEntry>(
kvp.Key, dbe));
}
/// <summary>
/// Send a message on the message channel. The message is sent
/// synchronously. The method blocks waiting for a response before
/// returning. If a response is not received within the timeout value
/// configured for this request, this method returns with an error
/// condition.
/// </summary>
/// <remarks>
/// <para>
/// To avoid block while waiting for a response from a remote site,
/// use <see cref="SendMessage"/>
/// </para>
/// <para>
/// The message sent by this method is received and handled at remote
/// sites using a message dispatch callback, which is configured using
/// <see cref="DatabaseEnvironment.RepMessageDispatch"/>
/// </para>
/// </remarks>
/// <param name="request">
/// DatabaseEntry objects array. Any flags for the DatabaseEntry objects
/// are ignored.
/// </param>
/// <param name="bufferSize">Size of bulk buffer</param>
/// <param name="timeout">
/// The amount of time that may elapse while this method waits for a
/// response from the remote site. The timeout value must be specified
/// as an unsigned 32-bit number of microseconds, limiting the maximum
/// timeout to roughly 71 minutes. A timeout value of 0 indicates that
/// the channel's default timeout value should be used. This default is
/// configured using <see cref="Timeout"/>.
/// </param>
/// <returns>Multiple responses from the remote site.</returns>
public MultipleDatabaseEntry SendRequest(
DatabaseEntry[] request, int bufferSize, uint timeout)
{
int size = request.Length;
IntPtr[] dbts = new IntPtr[size];
for (int i = 0; i < size; i++)
{
dbts[i] = DBT.getCPtr(DatabaseEntry.getDBT(request[i])).Handle;
}
DatabaseEntry data = new DatabaseEntry();
data.UserData = new byte[bufferSize];
channel.send_request(dbts, (uint)size, data, timeout,
DbConstants.DB_MULTIPLE);
MultipleDatabaseEntry response = new MultipleDatabaseEntry(data);
return(response);
}
/// <summary>
/// Protected method to call the key generation function.
/// </summary>
/// <param name="dbp">Secondary DB Handle</param>
/// <param name="keyp">Primary Key</param>
/// <param name="datap">Primary Data</param>
/// <param name="skeyp">Scondary Key</param>
/// <returns>0 on success, !0 on failure</returns>
protected static int doAssociate(
IntPtr dbp, IntPtr keyp, IntPtr datap, IntPtr skeyp)
{
DB db = new DB(dbp, false);
DBT key = new DBT(keyp, false);
DBT data = new DBT(datap, false);
DBT skey = new DBT(skeyp, false);
IntPtr dataPtr, sdataPtr;
int nrecs, dbt_sz;
DatabaseEntry s =
((SecondaryDatabase)db.api_internal).KeyGen(
DatabaseEntry.fromDBT(key), DatabaseEntry.fromDBT(data));
if (s == null)
{
return(DbConstants.DB_DONOTINDEX);
}
if (s is MultipleDatabaseEntry)
{
MultipleDatabaseEntry mde = (MultipleDatabaseEntry)s;
nrecs = mde.nRecs;
/*
* Allocate an array of nrecs DBT in native memory. The call
* returns sizeof(DBT), so that we know where one DBT ends and
* the next begins.
*/
dbt_sz = (int)libdb_csharp.alloc_dbt_arr(null, nrecs, out sdataPtr);
/*
* We need a managed array to copy each DBT into and then we'll
* copy the managed array to the native array we just allocated.
* We are not able to copy native -> native.
*/
byte[] arr = new byte[nrecs * dbt_sz];
IntPtr p;
int off = 0;
/* Copy each DBT into the array. */
foreach (DatabaseEntry dbt in mde)
{
/* Allocate room for the data in native memory. */
dataPtr = libdb_csharp.__os_umalloc(null, dbt.size);
Marshal.Copy(dbt.Data, 0, dataPtr, (int)dbt.size);
dbt.dbt.dataPtr = dataPtr;
dbt.flags |= DbConstants.DB_DBT_APPMALLOC;
p = DBT.getCPtr(DatabaseEntry.getDBT(dbt)).Handle;
Marshal.Copy(p, arr, off, dbt_sz);
off += dbt_sz;
}
Marshal.Copy(arr, 0, sdataPtr, nrecs * dbt_sz);
skey.dataPtr = sdataPtr;
skey.size = (uint)mde.nRecs;
skey.flags = DbConstants.DB_DBT_MULTIPLE | DbConstants.DB_DBT_APPMALLOC;
}
else
{
skey.data = s.Data;
}
return(0);
}
