DbCommandImageAccessor Class

A class that can get images by using IDbCommands. You can either sub-class this class and implement the abstract methods to provide the various commands, or DbSqlImageAccessor, which builds up commands from SQL, or DbStoredProcImageAccessor, which builds up commands from Stored Procedures.

Inheritance Hierarchy

SystemObject
  Atalasoft.Imaging.ImageSources.DataDbCommandImageAccessor
    Atalasoft.Imaging.ImageSources.DataDbSqlImageAccessor
    Atalasoft.Imaging.ImageSources.DataDbStoredProcImageAccessor

Namespace: Atalasoft.Imaging.ImageSources.Data
Assembly: Atalasoft.dotImage (in Atalasoft.dotImage.dll) Version: 11.4.0.9.0.377 (.NET 4.5.2, x86)

Syntax

Copy

[SerializableAttribute]
public abstract class DbCommandImageAccessor : IDbImageAccessor, 
	ISerializable

<SerializableAttribute>
Public MustInherit Class DbCommandImageAccessor
	Implements IDbImageAccessor, ISerializable

The DbCommandImageAccessor type exposes the following members.

Constructors

	Name	Description
	DbCommandImageAccessor(SerializationInfo, StreamingContext)	Deserializes stored information from the serialization info.
	DbCommandImageAccessor(GetConnectionCallback, Boolean, IDictionary)	Create an image accessor that uses IDbCommand objects to get images. The commands are created by sub-classes in the abstract methods.

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Properties

	Name	Description
	Decryptor	A delegate that can decrypt a string.
	Encryptor	A delegate that can encrypt a string.
	EncryptSerializedState	Whether or not the serialized state is encrypted. Please see documentation of sub-classes to see which members are encrypted.
	ExtraParameters	A copy of the extra parameters dictionary. This class does not support changing the parameters after the object has been constructed.
	GetConnection	A delegate that can return a connection to the database.
	ImageFieldName	The name of the image field in the dataset returned by Copy CreateGetImageRowCommand . If this method returns null, it is assumed to be in the first column.

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Methods

	Name	Description
	AddExtraParameters	Adds any extra parameters supplied by the user that are needed to run the command.
	CreateGetFrameCountCommand	A command that returns the frame count for an image. If this method returns null, the frame count will be determined by decoding the image stream. If not null, this command should result in a single row dataset with the frame count in the first column. If the frame count is stored separately from the image stream, implementing this method can greatly increase performance (especially first access). This command should not be associated with any connection.
	CreateGetImageRowCommand	A method that can return a command that gets a single row dataset with the image stream information at the given index. The field can either be a varbinary, binary or image type (in which case the image stream is the value of the field) or it can be a string which will be interpreted as a filename that contains the image. The command should not be associated with a connection.
	CreateGetImageStreamCountCommand	A command that can get the number of image streams in the source (each of which can contain multiple frames). This command should just return the number of streams (not the total frame count). The command should result in a single row dataset with the count in the first column. The command should not be associated with a connection.
	CreateStreamFromDatabaseObject	Creates a stream from the object obtained from the database. If the object is a byte array, it is attached to a MemoryStream. If the object is a string, it is interpreted as a filename and an open FileStream to the file is returned. If the object is null or not able to be interpreted as a stream, this method will throw.
	DecryptIfRequested	Decrypt a string if EncryptSerializedState is true.
	EncryptIfRequested	Encrypt a string if EncryptSerializedState is true.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	ExtractImageStream	Extracts a stream from a row of the database.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetDatabaseObject(IDbCommand, Int32)	Gets the database object from the first row of the data set returned by the command from the field at Copy index .
	GetDatabaseObject(IDbCommand, String)	Gets the database object from the first row of the data set returned by the command at the field named Copy field .
	GetDatabaseObject(IDbCommand, DbCommandImageAccessorFieldGetter, Object)	Gets the database object from the first row of the data set returned by the command from the field at Copy index which can be either a field name or an integer index.
	GetDecryptedValue	Gets the value from the serialized data and decrypts it if requested.
	GetFieldByInt	Gets a field from the datareader by passing in the index of a field.
	GetFieldByString	Gets a field from the datareader by passing in the name of the field.
	GetFrameCountInImage	The number of frames in the stream indicated by the imageStreamIndex
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetImageStreamCount	Gets the number of image streams in this database. Each stream can contain more than one frame.
	GetObjectData	Get the data to serialize for this object
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	Open	Opens a non-open connection
	Reset	Reset all caches of information. If you are storing anything that is a cached from the database, release it.
	StoreEncryptedValue	Stores the value into the serialization info and encrypts it if requested.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Reference

Atalasoft.Imaging.ImageSources.Data Namespace