DbSqlImageAccessor Methods |
The DbSqlImageAccessor type exposes the following members.
Methods| Name | Description | |
|---|---|---|
 | AddExtraParameters | Adds any extra parameters supplied by the user that are needed to run the command. (Inherited from DbCommandImageAccessor.) |
| CreateGetFieldCommand | Creates a command that can get the given field from the row indexed by
imageStreamIndex
from the datasource. |
| 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. (Overrides DbCommandImageAccessorCreateGetFrameCountCommand(IDbConnection, Int32).) |
| 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.
(Overrides DbCommandImageAccessorCreateGetImageRowCommand(IDbConnection, Int32).) |
| 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.
(Overrides DbCommandImageAccessorCreateGetImageStreamCountCommand(IDbConnection).) |
| CreateGetImageStreamCountQuery | Creates a SQL statement that can count the number of image streams. The count should be in the first
column
of the first row of the returned rows. |
| CreateSelectFieldByRowQuery | Creates a SQL Query using Common Table Expressions that can get a specific row by index from a
data source. |
| 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. (Inherited from DbCommandImageAccessor.) |
| DecryptIfRequested | Decrypt a string if EncryptSerializedState is true. (Inherited from DbCommandImageAccessor.) |
| EncryptIfRequested | Encrypt a string if EncryptSerializedState is true. (Inherited from DbCommandImageAccessor.) |
 | 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. (Inherited from DbCommandImageAccessor.) |
| 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 (Inherited from DbCommandImageAccessor.). |
| GetDatabaseObject(IDbCommand, String) | Gets the database object from the first row of the data set returned by the command
at the field named (Inherited from DbCommandImageAccessor.). |
| GetDatabaseObject(IDbCommand, DbCommandImageAccessorFieldGetter, Object) | Gets the database object from the first row of the data set returned by the command
from the field at (Inherited from DbCommandImageAccessor.)which can be either a field name or an integer index. |
| GetDecryptedValue | Gets the value from the serialized data and decrypts it if requested. (Inherited from DbCommandImageAccessor.) |
| GetFieldByInt | Gets a field from the datareader by passing in the index of a field. (Inherited from DbCommandImageAccessor.) |
| GetFieldByString |
Gets a field from the datareader by passing in the name of the field.
(Inherited from DbCommandImageAccessor.) |
| GetFieldNameFromExpression | Takes SQL field clause and returns the name of the column. |
| GetFrameCountInImage |
The number of frames in the stream indicated by the imageStreamIndex
(Inherited from DbCommandImageAccessor.) |
| 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.
(Inherited from DbCommandImageAccessor.) |
| GetObjectData | Get the data to serialize for this object (Overrides DbCommandImageAccessorGetObjectData(SerializationInfo, StreamingContext).) |
| 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 (Inherited from DbCommandImageAccessor.) |
| Reset | Reset all caches of information.
If you are storing anything that is a cached from the database, release it. (Inherited from DbCommandImageAccessor.) |
| StoreEncryptedValue | Stores the value into the serialization info and encrypts it if requested. (Inherited from DbCommandImageAccessor.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
See Also