Namespace Azos.Data.Access

Classes

CRUDOperationCallContext

Establishes an async-safe context which surrounds CRUD operations. You can derive your own classes, the .ctor must be chained. The context flows between async operations and can be nested. Logical flow must be observed: a call to .ctor must be balanced with eventual call to .Dispose() (which may be async). This class is used to pass some out-of-band information to CRUD operations without changing the caller interface, i.e. to swap database connection string

CRUDQueryHandler

Represents an entity that can execute a query. The implementation may be called by multiple threads and must be safe

CRUDQueryHandler<TStore>

Represents an entity that can execute a query. The implementation may be called by multiple threads and must be safe

CRUDTransaction

Represents an abstract base for CRUDTransactions that perform particular backend CRUD work in overriden classes

Cursor

Represents a buffer-less unidicrectional reader that binds IEnumerable(Doc) and the backend resource (such as SQLReader or other object which is internal to the backend). The cursor is NOT thread-safe and must be disposed properly by closing all resources associated with it. Only one iteration (one call to GetEnumerator) is possible

Cursor.enumerator

DataAccessException

Thrown by data access classes

NameValueDataStoreKey

Defines dictionary of string/object pairs used for key matching, where string dictionary key represents column name in storage and value is an object for the key

NOPDataStore

Represents data store that does not do anything

PassthroughCursor

Represents a cursor that basically does nothing else but passes through control to source IEnumerable(Row)

Query

Defines a query sent into ICRUDDataStore implementor to retrieve data. A Query is a named bag of paremeters where every parameter has a name and the value.

Query.Param

Represents a CRUD query parameter

Query<TResultDoc>

Generic version of Query

QueryResolver

Infrastructure class - not for app developers. Resolves Query objects into query handlers. Query names are case-insensitive. This class is thread-safe

QuerySource

Represents query source code with pre-processed pragmas

QuerySource.ColumnDef

Provides column definition in QuerySource

Structs

CacheParams

Implements ICacheParams - supplied caching parameters

ConsecutiveUniqueSequenceIds

Represents a starting ID along with the number of consecutive generated IDs of the sequence

CounterDataStoreKey

Represents a key (key field) used in databases that identify entities with BIGINT identity/autoinc columns

Interfaces

ICRUDDataStore

Represents a DataStore that supports CRUD operations

ICRUDDataStoreImplementation

ICRUDOperations

Describes an entity that performs single (not in transaction/batch)CRUD operations

ICRUDQueryExecutionContext

Represents a context (such as Sql Server connection + transaction scope, or Hadoop connect string etc.) for query execution. This is a marker interface implemented by particular providers

ICRUDQueryResolver

Represents a class that resolves Query into suitable handler that can execute it

ICRUDTransactionOperations

Describes an entity that performs single (not in transaction/batch)CRUD operations

IDataStore

Represents a store that can save and retrieve data

IDataStoreImplementation

Represents a store that can save and retrieve data

IDataStoreKey

Decorator interface for entities used to uniquely identify entities in a store

IDistributedStableHashProvider

Denotes entities that provide ULONG STABLE hash code for use in a distributed (large scale) system. This is needed primarily for cluster/large datasets to properly compute 64bit sharding addresses and to differentiate from GetHashCode() that returns 32 bits unstable hash for local object location in hashtables. DO not confuse with object.GetHashCode() which is un-suitable for long-term persistence

Namespace Azos.Data.Access

Classes

Structs

Interfaces

Enums