MergeConstantAction (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.sql.execute.MergeConstantAction

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Formatable, TypedFormat, ConstantAction
```
public class MergeConstantAction
extends java.lang.Object
implements ConstantAction, Formatable
```
Describes the execution machinery needed to evaluate a MERGE statement.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

private MatchingClauseConstantAction[] _matchingClauses

private static int FIRST_VERSION
Serial version produced by the serialver utility.
- Fields inherited from interface org.apache.derby.iapi.sql.execute.ConstantAction
  WHEN_MATCHED_THEN_DELETE, WHEN_MATCHED_THEN_UPDATE, WHEN_NOT_MATCHED_THEN_INSERT

Fields
Modifier and Type	Field	Description
`private MatchingClauseConstantAction[]`	`_matchingClauses`
`private static int`	`FIRST_VERSION`	Serial version produced by the serialver utility.

Constructor Summary

Constructors
Constructor	Description
`MergeConstantAction()`	0-arg constructor needed by Formatable machinery
`MergeConstantAction(ConstantAction[] matchingClauses)`	Construct from thin air.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`executeConstantAction(Activation activation)`	Run the ConstantAction.
`MatchingClauseConstantAction`	`getMatchingClause(int idx)`	Get the ith (0-based) matching clause
`int`	`getTypeFormatId()`	Get the formatID which corresponds to this class.
`int`	`matchingClauseCount()`	Get the number of matching clauses
`void`	`readExternal(java.io.ObjectInput in)`	Read this object from a stream of stored objects.
`void`	`writeExternal(java.io.ObjectOutput out)`	Write this object to a stream of stored objects.

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

- Field Detail
  - FIRST_VERSION
```
private static final int FIRST_VERSION
```
    Serial version produced by the serialver utility. Needed in order to make serialization work reliably across different compilers.
    
    See Also:
    
    Constant Field Values
  - _matchingClauses
```
private MatchingClauseConstantAction[] _matchingClauses
```
- Constructor Detail
  - MergeConstantAction
```
public MergeConstantAction()
```
    0-arg constructor needed by Formatable machinery
  - MergeConstantAction
```
public MergeConstantAction(ConstantAction[] matchingClauses)
```
    Construct from thin air.
    
    Parameters:
    
    matchingClauses - Constant actions for WHEN [ NOT ] MATCHED clauses.
- Method Detail
  - matchingClauseCount
```
public int matchingClauseCount()
```
    Get the number of matching clauses
  - getMatchingClause
```
public MatchingClauseConstantAction getMatchingClause(int idx)
```
    Get the ith (0-based) matching clause
  - executeConstantAction
```
public void executeConstantAction(Activation activation)
                           throws StandardException
```
    Description copied from interface: ConstantAction
    
    Run the ConstantAction.
    
    Specified by:
    
    executeConstantAction in interface ConstantAction
    
    Parameters:
    
    activation - The execution environment for this constant action.
    
    Throws:
    
    StandardException - Thrown on failure
  - readExternal
```
public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException
```
    Read this object from a stream of stored objects.
    
    Specified by:
    
    readExternal in interface java.io.Externalizable
    
    Parameters:
    
    in - read this.
    
    Throws:
    
    java.io.IOException - thrown on error
    
    java.lang.ClassNotFoundException - thrown on error
  - writeExternal
```
public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException
```
    Write this object to a stream of stored objects.
    
    Specified by:
    
    writeExternal in interface java.io.Externalizable
    
    Parameters:
    
    out - write bytes here.
    
    Throws:
    
    java.io.IOException - thrown on error
  - getTypeFormatId
```
public int getTypeFormatId()
```
    Get the formatID which corresponds to this class.
    
    Specified by:
    
    getTypeFormatId in interface TypedFormat
    
    Returns:
    
    the formatID of this class

Class MergeConstantAction

Field Summary

Fields inherited from interface org.apache.derby.iapi.sql.execute.ConstantAction

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

FIRST_VERSION

_matchingClauses

Constructor Detail

MergeConstantAction

MergeConstantAction

Method Detail

matchingClauseCount

getMatchingClause

executeConstantAction

readExternal

writeExternal

getTypeFormatId