Dataset (Apache Jena ARQ)

All Superinterfaces:

Transactional

All Known Implementing Classes:

DatasetImpl
```
public interface Dataset
extends Transactional
```
Query is over a Dataset, a collection of named graphs and a background graph (also called the default graph or unnamed graph).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`abort()` Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
`void`	`addNamedModel(String uri, Model model)` Set a named graph.
`DatasetGraph`	`asDatasetGraph()` Get the dataset in graph form
`void`	`begin(ReadWrite readWrite)` Start either a READ or WRITE transaction
`void`	`close()` Close the dataset, potentially releasing any associated resources.
`void`	`commit()` Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
`boolean`	`containsNamedModel(String uri)` Does the dataset contain a model with the name supplied?
`void`	`end()` Finish the transaction - if a write transaction and commit() has not been called, then abort
`Context`	`getContext()` Get the context associated with this dataset
`Model`	`getDefaultModel()` Get the default graph as a Jena Model
`Lock`	`getLock()` Get the lock for this dataset
`Model`	`getNamedModel(String uri)` Get a graph by name as a Jena Model
`boolean`	`isInTransaction()` Say whether a transaction is active
`Iterator<String>`	`listNames()` List the names
`void`	`removeNamedModel(String uri)` Remove a named graph.
`void`	`replaceNamedModel(String uri, Model model)` Change a named graph for another using the same name
`void`	`setDefaultModel(Model model)` Set the default graph.
`boolean`	`supportsTransactionAbort()` Declare whether `abort()` is supported.
`boolean`	`supportsTransactions()` Does this dataset support transactions? Supporting transactions means that the dataset implementation provides `begin(org.apache.jena.query.ReadWrite)`, `commit()`, `end()` which otherwise may throw `UnsupportedOperationException`.

- Method Detail
  - getDefaultModel
```
Model getDefaultModel()
```
    Get the default graph as a Jena Model
  - setDefaultModel
```
void setDefaultModel(Model model)
```
    Set the default graph. Can be set to null for none.
  - getNamedModel
```
Model getNamedModel(String uri)
```
    Get a graph by name as a Jena Model
  - containsNamedModel
```
boolean containsNamedModel(String uri)
```
    Does the dataset contain a model with the name supplied?
  - addNamedModel
```
void addNamedModel(String uri,
                   Model model)
```
    Set a named graph.
  - removeNamedModel
```
void removeNamedModel(String uri)
```
    Remove a named graph.
  - replaceNamedModel
```
void replaceNamedModel(String uri,
                       Model model)
```
    Change a named graph for another using the same name
  - listNames
```
Iterator<String> listNames()
```
    List the names
  - getLock
```
Lock getLock()
```
    Get the lock for this dataset
  - getContext
```
Context getContext()
```
    Get the context associated with this dataset
  - supportsTransactions
```
boolean supportsTransactions()
```
    Does this dataset support transactions? Supporting transactions means that the dataset implementation provides begin(org.apache.jena.query.ReadWrite), commit(), end() which otherwise may throw UnsupportedOperationException.
    See supportsTransactionAbort() for abort(). A Dataset that provides functionality across independent systems can not provide all features strong guarantees. For example, they may use MRSW locking and some isolation control. Specifically, they do not necessarily provide abort().
    In addition, check details of a specific implementation.
  - supportsTransactionAbort
```
boolean supportsTransactionAbort()
```
    Declare whether abort() is supported. This goes along with clearing up after exceptions inside application transaction code.
  - begin
```
void begin(ReadWrite readWrite)
```
    Start either a READ or WRITE transaction
    
    Specified by:
    
    begin in interface Transactional
  - commit
```
void commit()
```
    Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
    
    Specified by:
    
    commit in interface Transactional
  - abort
```
void abort()
```
    Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
    
    Specified by:
    
    abort in interface Transactional
  - isInTransaction
```
boolean isInTransaction()
```
    Say whether a transaction is active
    
    Specified by:
    
    isInTransaction in interface Transactional
  - end
```
void end()
```
    Finish the transaction - if a write transaction and commit() has not been called, then abort
    
    Specified by:
    
    end in interface Transactional
  - asDatasetGraph
```
DatasetGraph asDatasetGraph()
```
    Get the dataset in graph form
  - close
```
void close()
```
    Close the dataset, potentially releasing any associated resources. The dataset can not be used for query after this call.

Interface Dataset

Method Summary

Method Detail

getDefaultModel

setDefaultModel

getNamedModel

containsNamedModel

addNamedModel

removeNamedModel

replaceNamedModel

listNames

getLock

getContext

supportsTransactions

supportsTransactionAbort

begin

commit

abort

isInTransaction

end

asDatasetGraph

close