Composite uid comprising an attribute and a relationship

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selectable unit comprised of multiple tables, complete with its own composite primary key, Additionally, the column is mapped explicitly to an attribute The natural primary key of the above mapping is the composite of (, which is that we wish to build a relationship() to such a mapper; this is useful in. An attribute or attributes in one table whose values must match the primary key in Composite UID . A relationship that is found within a single entity type. composite (class Composite). A concept relationship can be a link (class Link) or a prerequisite (class Prerequisite), or a is-part-of relation (class On page), etc. The component information consists of attributes (class Attribute), Link resolves to the given UID. context Domain:: linksTo (uid: UID): Set (UID) pre.

The frames of a Multi-frame image a cine run or the slices of a volume are sequentially ordered and share a number of common properties.

A few Attributes may vary between frames e.

SQLAlchemy 1.3 Documentation

All common Image IE Attributes refer to the first frame of a multiple frame image. Overlay and Lookup Table data may be included within an Image IE only if this information is directly associated with the image. The Overlay IE may represent in a bit-map format, graphics or text and is used to indicate such items as region of interest, reference marks and annotations. Sufficient information shall be available to allow an overlay to be presented at a display station superimposed on a particular image with which it is associated.

An Overlay Plane may be represented as a single frame when associated with a single frame image or as multiple frames of overlay planes when associated with a Multi-frame image.

The Modality LUT may be contained within an image, or a presentation state that references an image. This transformation is applied after any Modality LUT. The waveform consists of measurements of some physical qualities e. The measured qualities may originate, for example, in any of the following sources: The sample data within a Waveform IE may represent one or more acquired channels. Several signal channels acquired at the same sampling rate can be multiplexed by interleaving samples in a single multiplex group.

These include semantic context as well as Attributes related to document completion, verification and other characteristics. Note For example, raw data may be used with CT and MR systems to reconstruct sets of images or for MR to reconstruct spectroscopic data.

Non-Traditional Mappings — SQLAlchemy Documentation

The format of the raw data is vendor specific. These include Attributes related to document origin, title, and other characteristics. A surface is defined by its shape and can be further defined by normals on that shape. The surface may be reconstructed from either spatial scans e. A surface is described by its finite volume and manifold property, gray scale and color mapping characteristics, presentation type, opacity, and modality specific characteristics. A surface is related to a single Series.

The following information must be specified for each Module in the table: If the specified conditions are not met, this Module shall not be supported; that is, no information defined in that Module shall be sent. This table is for informative purposes only. Enhanced identifier generators Starting with release 3. The first aspect is database portability; the second is optimization Optimization means that you do not have to query the database for every request for a new identifier value.

These two new generators are intended to take the place of some of the named generators described above, starting in 3. However, they are included in the current releases and can be referenced by FQN.

The first of these new generators is org. SequenceStyleGenerator which is intended, firstly, as a replacement for the sequence generator and, secondly, as a better portability generator than native. This is because native generally chooses between identity and sequence which have largely different semantics that can cause subtle issues in applications eyeing portability. SequenceStyleGenerator, however, achieves portability in a different manner. It chooses between a table or a sequence in the database to store its incrementing values, depending on the capabilities of the dialect being used.

SACM Information Model

The difference between this and native is that table-based and sequence-based storage have the same exact semantic. In fact, sequences are exactly what Hibernate tries to emulate with its table-based generators. This generator has a number of configuration parameters: TableGenerator, which is intended, firstly, as a replacement for the table generator, even though it actually functions much more like org.

Essentially this generator defines a table capable of holding a number of different increment values simultaneously by using multiple distinctly keyed rows. This is the value which identifies which increment value to use. The "segment key" value for the segment from which we want to pull increment values for this generator.

Used for schema generation; the column size to create this segment key column. The initial value to be retrieved from the table.

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The value by which subsequent calls to the table should differ. Identifier generator optimization For identifier generators that store values in the database, it is inefficient for them to hit the database on each and every call to generate a new identifier value. Instead, you can group a bunch of them in memory and only hit the database when you have exhausted your in-memory value group.

This is the role of the pluggable optimizers. The values from the database for this optimizer are expected to be sequential. The values retrieved from the database structure for this optimizer indicates the "group number". Here, however, we simply store the starting value for the "next group" into the database structure rather than a sequential value in combination with an in-memory grouping algorithm.

It must also implement Serializable. Unfortunately, this approach means that a persistent object is its own identifier. There is no convenient "handle" other than the object itself. You must instantiate an instance of the persistent class itself and populate its identifier properties before you can load the persistent state associated with a composite key. We call this approach an embedded composite identifier, and discourage it for serious applications.

The identifier class must override equals and hashCode and implement Serializable.