/// <summary>
/// Creates a brand new database with no tables.
/// </summary>
/// <param name="process">The FrostDB process.</param>
/// <param name="name">The name of the database.</param>
public Database2(Process process, string name)
{
_process = process;
_name = name;
_databaseId = _process.DatabaseManager.GetNextDatabaseId();
_storage = new DbStorage(_process, name, _databaseId);
}
public BTreeContainer(BTreeAddress address, TreeDictionary <int, Page> tree, DbStorage storage, TableSchema2 schema, Process process)
{
_tree = tree;
_address = address;
_storage = storage;
_schema = schema;
_process = process;
}
/// <summary>
/// Creates a database from a DBFill object. Used when booting up from disk.
/// </summary>
/// <param name="process">The FrostDB process.</param>
/// <param name="fill">A DBFill object (usually loaded from disk.)</param>
public Database2(Process process, DbFill fill, DbStorage storage)
{
_tables = new List <Table2>();
_process = process;
_name = fill.Schema.DatabaseName;
_databaseId = fill.Schema.DatabaseId;
_storage = storage;
_schema = fill.Schema;
FillTables(fill);
// to do: anything else?
}
/// <summary>
/// Constructs a table based on the specified TableSchema. Used when loading FrostDB from disk.
/// </summary>
/// <param name="process">The FrostDB process.</param>
/// <param name="schema">The table schema (loaded from disk, usually from a DBFill object.)</param>
/// <param name="dbStorage">The backing storage object for the database this table is attached to</param>
/// <param name="pager">The in memory cache for FrostDb</param>
public Table2(Process process, TableSchema2 schema, DbStorage dbStorage, Cache pager)
{
_process = process;
_schema = schema;
_name = schema.Name;
_databaseName = schema.DatabaseName;
_columns = schema.Columns;
_tableId = schema.TableId;
_databaseId = schema.DatabaseId;
_storage = dbStorage;
_cache = pager;
}
/// <summary>
/// Gets a list of databases from disk
/// </summary>
/// <returns>A list of databases</returns>
public Database2[] GetDatabases()
{
var databases = GetOnlineDatabases();
Database2[] result = new Database2[databases.Length];
int i = 0;
foreach (var db in databases)
{
var storage = new DbStorage(_process, db);
var dbItem = storage.GetDatabase(db);
storage.Initialize();
result[i] = dbItem;
i++;
}
return(result);
}
/// <summary>
/// Tries to load a container from disk file. If this is a fresh database, will return a new container.
/// </summary>
/// <param name="address">The address of the container to get</param>
/// <returns>A container from disk</returns>
private BTreeContainer GetContainerFromDisk(BTreeAddress address)
{
Database2 db = _process.GetDatabase2(address.DatabaseId);
DbStorage storage = db.Storage;
var tree = new TreeDictionary <int, Page>();
TableSchema2 schema = db.GetTable(address.TableId).Schema;
// get the first page
Page page = storage.GetPage(1, address);
// if this is a brand new table
if (page == null)
{
page = new Page(1, address.TableId, address.DatabaseId, schema, _process);
}
tree.Add(page.Id, page);
return(new BTreeContainer(address, tree, storage, schema, _process));
}
public Database(Process process, IDbFill fill, DbStorage dbStorage)
{
throw new NotImplementedException();
}
