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## org.apache.cayenne.access
Class DataNode

    java.lang.Object
      org.apache.cayenne.access.DataNode

All Implemented Interfaces:
  QueryEngine

Direct Known Subclasses:
  OracleDataNode

    public class DataNode

extends java.lang.Object
implements QueryEngine

Describes a single physical data source. This can be a database server, LDAP server, etc.

For more information see Cayenne User Guide.

Author:
  Andrus Adamchik

Field Summary
`protected DbAdapter` | `adapter`
`protected java.util.Map` | `dataMaps`
`protected javax.sql.DataSource` | `dataSource`
`protected java.lang.String` | `dataSourceFactory`
`protected java.lang.String` | `dataSourceLocation`
`static java.lang.Class` | `DEFAULT_ADAPTER_CLASS` Deprecated. since 1.2 unused.
`protected EntityResolver` | `entityResolver`
`protected EntitySorter` | `entitySorter`
`protected java.lang.String` | `name`

Constructor Summary
`DataNode()` Creates a new unnamed DataNode.
`DataNode(java.lang.String name)` Creates a new DataNode, assigning it a name.

Method Summary
`void` | `addDataMap(DataMap map)` Adds a DataMap to be handled by this node.
`DbAdapter` | `getAdapter()` Returns DbAdapter object.
`java.util.Collection` | `getDataMaps()` Returns an unmodifiable collection of DataMaps handled by this DataNode.
`javax.sql.DataSource` | `getDataSource()` Returns DataSource used by this DataNode to obtain connections.
`java.lang.String` | `getDataSourceFactory()` Returns a name of DataSourceFactory class for this node.
`java.lang.String` | `getDataSourceLocation()` Returns a location of DataSource of this node.
`EntityResolver` | `getEntityResolver()` Returns EntityResolver that handles DataMaps of this node.
`EntitySorter` | `getEntitySorter()` Returns EntitySorter used by the DataNode.
`java.lang.String` | `getName()` Returns node name.
`DataNode` | `lookupDataNode(DataMap dataMap)` Returns a DataNode that should hanlde queries for all DataMap components.
`void` | `performQueries(java.util.Collection queries, OperationObserver callback)` Runs queries using Connection obtained from internal DataSource.
`void` | `performQueries(java.util.Collection queries, OperationObserver observer, Transaction transaction)` Deprecated. since 1.2 as the corresponding interface method is deprecated.
`protected void` | `readResultSet(java.sql.ResultSet resultSet, ResultDescriptor descriptor, GenericSelectQuery query, OperationObserver delegate)` Deprecated. Since 1.2 this logic is moved to SQLAction.
`protected void` | `readStoredProcedureOutParameters(java.sql.CallableStatement statement, ResultDescriptor descriptor, Query query, OperationObserver delegate)` Deprecated. Since 1.2 this logic is moved to SQLAction.
`void` | `removeDataMap(java.lang.String mapName)`
`protected void` | `runBatchUpdate(java.sql.Connection connection, BatchQuery query, OperationObserver observer)` Deprecated. since 1.2
`protected void` | `runBatchUpdateAsBatch(java.sql.Connection con, BatchQuery query, BatchQueryBuilder queryBuilder, OperationObserver delegate)` Deprecated. since 1.2 SQLActions are used.
`protected void` | `runBatchUpdateAsIndividualQueries(java.sql.Connection con, BatchQuery query, BatchQueryBuilder queryBuilder, OperationObserver delegate)` Deprecated. since 1.2 SQLActions are used.
`protected void` | `runSelect(java.sql.Connection connection, Query query, OperationObserver observer)` Deprecated. since 1.2
`protected void` | `runStoredProcedure(java.sql.Connection con, Query query, OperationObserver delegate)` Deprecated. since 1.2
`protected void` | `runUpdate(java.sql.Connection con, Query query, OperationObserver delegate)` Deprecated. since 1.2
`void` | `setAdapter(DbAdapter adapter)`
`void` | `setDataMaps(java.util.Collection dataMaps)`
`void` | `setDataSource(javax.sql.DataSource dataSource)`
`void` | `setDataSourceFactory(java.lang.String dataSourceFactory)`
`void` | `setDataSourceLocation(java.lang.String dataSourceLocation)`
`void` | `setEntityResolver(EntityResolver entityResolver)` Sets EntityResolver.
`void` | `setEntitySorter(EntitySorter entitySorter)` Sets an EntitySorter that is used to order objects on commit.
`void` | `setName(java.lang.String name)`
`void` | `shutdown()` Tries to close JDBC connections opened by this node's data source.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_ADAPTER_CLASS

    public static final java.lang.Class DEFAULT_ADAPTER_CLASS

  Deprecated. since 1.2 unused.

### name

    protected java.lang.String name

### dataSource

    protected javax.sql.DataSource dataSource

### adapter

    protected DbAdapter adapter

### dataSourceLocation

    protected java.lang.String dataSourceLocation

### dataSourceFactory

    protected java.lang.String dataSourceFactory

### entityResolver

    protected EntityResolver entityResolver

### entitySorter

    protected EntitySorter entitySorter

### dataMaps

    protected java.util.Map dataMaps

Constructor Detail

### DataNode

    public DataNode()

  Creates a new unnamed DataNode.

### DataNode

    public DataNode(java.lang.String name)

  Creates a new DataNode, assigning it a name.

Method Detail

### getName

    public java.lang.String getName()

  Returns node name. Name is used to uniquely identify DataNode within a DataDomain.

### setName

    public void setName(java.lang.String name)

### getDataSourceLocation

    public java.lang.String getDataSourceLocation()

  Returns a location of DataSource of this node. Depending on how this node was created, location is either a JNDI name, or a location of node XML file, etc.

### setDataSourceLocation

    public void setDataSourceLocation(java.lang.String dataSourceLocation)

### getDataSourceFactory

    public java.lang.String getDataSourceFactory()

  Returns a name of DataSourceFactory class for this node.

### setDataSourceFactory

    public void setDataSourceFactory(java.lang.String dataSourceFactory)

### getDataMaps

    public java.util.Collection getDataMaps()

  Returns an unmodifiable collection of DataMaps handled by this DataNode.

  Specified by:
    `getDataMaps` in interface `QueryEngine`

### setDataMaps

    public void setDataMaps(java.util.Collection dataMaps)

### addDataMap

    public void addDataMap(DataMap map)

  Adds a DataMap to be handled by this node.

### removeDataMap

    public void removeDataMap(java.lang.String mapName)

### getDataSource

    public javax.sql.DataSource getDataSource()

  Returns DataSource used by this DataNode to obtain connections.

### setDataSource

    public void setDataSource(javax.sql.DataSource dataSource)

### getAdapter

    public DbAdapter getAdapter()

  Returns DbAdapter object. This is a plugin that handles RDBMS vendor-specific features.

### setAdapter

    public void setAdapter(DbAdapter adapter)

### lookupDataNode

    public DataNode lookupDataNode(DataMap dataMap)

  Returns a DataNode that should hanlde queries for all DataMap components.

  Specified by:
    `lookupDataNode` in interface `QueryEngine`
  Since:
    1.1

### performQueries

    public void performQueries(java.util.Collection queries,
                               OperationObserver observer,
                               Transaction transaction)

  Deprecated. since 1.2 as the corresponding interface method is deprecated.

  Description copied from interface: `QueryEngine`
  Executes queries in the transactional context provided by the caller. It is caller's responsibility to commit or rollback the Transaction and close any connections that were added to it.

  Specified by:
    `performQueries` in interface `QueryEngine`

### performQueries

    public void performQueries(java.util.Collection queries,
                               OperationObserver callback)

  Runs queries using Connection obtained from internal DataSource.

  Specified by:
    `performQueries` in interface `QueryEngine`
  Since:
    1.1

### runSelect

    protected void runSelect(java.sql.Connection connection,
                             Query query,
                             OperationObserver observer)
                      throws java.sql.SQLException,
                             java.lang.Exception

  Deprecated. since 1.2

  Executes a SelectQuery.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### runUpdate

    protected void runUpdate(java.sql.Connection con,
                             Query query,
                             OperationObserver delegate)
                      throws java.sql.SQLException,
                             java.lang.Exception

  Deprecated. since 1.2

  Executes a non-batched updating query.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### runBatchUpdate

    protected void runBatchUpdate(java.sql.Connection connection,
                                  BatchQuery query,
                                  OperationObserver observer)
                           throws java.sql.SQLException,
                                  java.lang.Exception

  Deprecated. since 1.2

  Executes a batch updating query.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### runBatchUpdateAsBatch

    protected void runBatchUpdateAsBatch(java.sql.Connection con,
                                         BatchQuery query,
                                         BatchQueryBuilder queryBuilder,
                                         OperationObserver delegate)
                                  throws java.sql.SQLException,
                                         java.lang.Exception

  Deprecated. since 1.2 SQLActions are used.

  Executes batch query using JDBC Statement batching features.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### runBatchUpdateAsIndividualQueries

    protected void runBatchUpdateAsIndividualQueries(java.sql.Connection con,
                                                     BatchQuery query,
                                                     BatchQueryBuilder queryBuilder,
                                                     OperationObserver delegate)
                                              throws java.sql.SQLException,
                                                     java.lang.Exception

  Deprecated. since 1.2 SQLActions are used.

  Executes batch query without using JDBC Statement batching features, running individual statements in the batch one by one.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### runStoredProcedure

    protected void runStoredProcedure(java.sql.Connection con,
                                      Query query,
                                      OperationObserver delegate)
                               throws java.sql.SQLException,
                                      java.lang.Exception

  Deprecated. since 1.2

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### readStoredProcedureOutParameters

    protected void readStoredProcedureOutParameters(java.sql.CallableStatement statement,
                                                    ResultDescriptor descriptor,
                                                    Query query,
                                                    OperationObserver delegate)
                                             throws java.sql.SQLException,
                                                    java.lang.Exception

  Deprecated. Since 1.2 this logic is moved to SQLAction.

  Helper method that reads OUT parameters of a CallableStatement.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### readResultSet

    protected void readResultSet(java.sql.ResultSet resultSet,
                                 ResultDescriptor descriptor,
                                 GenericSelectQuery query,
                                 OperationObserver delegate)
                          throws java.sql.SQLException,
                                 java.lang.Exception

  Deprecated. Since 1.2 this logic is moved to SQLAction.

  Helper method that reads a ResultSet.

  Throws:
    `java.sql.SQLException`
    `java.lang.Exception`

### getEntityResolver

    public EntityResolver getEntityResolver()

  Returns EntityResolver that handles DataMaps of this node.

  Specified by:
    `getEntityResolver` in interface `QueryEngine`

### setEntityResolver

    public void setEntityResolver(EntityResolver entityResolver)

  Sets EntityResolver. DataNode relies on externally set EntityResolver, so if the node is created outside of DataDomain stack, a valid EntityResolver must be provided explicitly.

  Since:
    1.1

### getEntitySorter

    public EntitySorter getEntitySorter()

  Returns EntitySorter used by the DataNode.

### setEntitySorter

    public void setEntitySorter(EntitySorter entitySorter)

  Sets an EntitySorter that is used to order objects on commit.

  Since:
    1.2

### shutdown

    public void shutdown()

  Tries to close JDBC connections opened by this node's data source.

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