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## org.apache.cayenne
Class DataRow

    java.lang.Object
      java.util.AbstractMap<K,V>
          java.util.HashMap<String,Object>
              org.apache.cayenne.DataRow

All Implemented Interfaces:
  Serializable, Cloneable, Map<String,Object>

    public class DataRow

extends HashMap<String,Object>

DataRow a map that holds values retrieved from the database for a given query row. DataRows are used to cache raw database data and as a reference point for tracking DataObject changes.

Since:
  1.1
See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap
`AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>`

Field Summary
`protected String` | `entityName`
`protected long` | `replacesVersion`
`protected long` | `version`

Constructor Summary
`DataRow(int initialCapacity)`
`DataRow(Map<String,?> map)`

Method Summary
`DataRow` | `applyDiff(DataRow diff)` Builds a new DataRow, merging changes from `diff` parameter with data contained in this DataRow.
`DataRow` | `createDiff(DataRow row)` Creates a DataRow that contains only the keys that have values that differ between this object and `row` parameter.
`ObjectId` | `createTargetObjectId(String entityName, DbRelationship relationship)` Returns an ObjectId of an object on the other side of the to-one relationship, for this DataRow representing a source of relationship.
`String` | `getEntityName()`
`long` | `getReplacesVersion()`
`long` | `getVersion()`
`void` | `setEntityName(String entityName)`
`void` | `setReplacesVersion(long replacesVersion)` Sets the version of DataRow replaced by this one in the store.
`String` | `toString()`

Methods inherited from class java.util.HashMap
`clear, clone, containsKey, containsValue, entrySet, get, isEmpty, keySet, put, putAll, remove, size, values`

Methods inherited from class java.util.AbstractMap
`equals, hashCode`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Map
`equals, hashCode`

Field Detail

### version

    protected long version

### replacesVersion

    protected long replacesVersion

### entityName

    protected String entityName

Since:
  3.0

Constructor Detail

### DataRow

    public DataRow(Map<String,?> map)

### DataRow

    public DataRow(int initialCapacity)

Method Detail

### getVersion

    public long getVersion()

### getReplacesVersion

    public long getReplacesVersion()

### setReplacesVersion

    public void setReplacesVersion(long replacesVersion)

  Sets the version of DataRow replaced by this one in the store.

### applyDiff

    public DataRow applyDiff(DataRow diff)

  Builds a new DataRow, merging changes from `diff` parameter with data contained in this DataRow.

### createDiff

    public DataRow createDiff(DataRow row)

  Creates a DataRow that contains only the keys that have values that differ between this object and `row` parameter. Diff values are taken from the `row` parameter. It is assumed that key sets are compatible in both rows (e.g. they represent snapshots for the same entity). Returns null if no differences are found.

### createTargetObjectId

    public ObjectId createTargetObjectId(String entityName,
                                         DbRelationship relationship)

  Returns an ObjectId of an object on the other side of the to-one relationship, for this DataRow representing a source of relationship. Returns null if snapshot FK columns indicate a null to-one relationship.

### toString

    public String toString()

  Overrides:
    `toString` in class `AbstractMap<String,Object>`

### getEntityName

    public String getEntityName()

  Since:
    3.0

### setEntityName

    public void setEntityName(String entityName)

  Since:
    3.0

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