Class ConstraintInfo

java.lang.Object

org.apache.derby.impl.sql.execute.ConstraintInfo

All Implemented Interfaces:

Externalizable, Serializable, Formatable, TypedFormat, ConsInfo

public class ConstraintInfo
extends Object
implements ConsInfo

This is a simple class used to store the run time information about a constraint.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private String[]	columnNames
private int	raDeleteRule
private int	raUpdateRule
private String	tableName	This class implements Formatable.
private UUID	tableSchemaId
private SchemaDescriptor	tableSd

Constructor Summary

Constructors

Constructor	Description
ConstraintInfo()	Niladic constructor for Formattable
ConstraintInfo(String tableName, SchemaDescriptor tableSd, String[] columnNames, int raDeleteRule, int raUpdateRule)	Consructor

Method Summary

Modifier and Type	Method	Description
String[]	getReferencedColumnNames()	This ConsInfo describes columns in a referenced table.
TableDescriptor	getReferencedTableDescriptor(DataDictionary dd)	This ConsInfo describes columns in a referenced table.
String	getReferencedTableName()	Get the name of the table that these column live in.
SchemaDescriptor	getReferencedTableSchemaDescriptor(DataDictionary dd)	This ConsInfo describes columns in a referenced table.
int	getReferentialActionDeleteRule()	Get the referential Action for a Delete.
int	getReferentialActionUpdateRule()	Get the referential Action for an Update.
int	getTypeFormatId()	Get the formatID which corresponds to this class.
void	readExternal(ObjectInput in)	Read this object from a stream of stored objects.
String	toString()	///////////////////////////////////////////////////////////
void	writeExternal(ObjectOutput out)	Write this object out

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

tableName

private String tableName

This class implements Formatable. That means that it can write itself to and from a formatted stream. If you add more fields to this class, make sure that you also write/read them with the writeExternal()/readExternal() methods. If, inbetween releases, you add more fields to this class, then you should bump the version number emitted by the getTypeFormatId() method. OR, since this is something that is used in stored prepared statements, it is ok to change it if you make sure that stored prepared statements are invalidated across releases.

tableSd

private SchemaDescriptor tableSd

tableSchemaId

private UUID tableSchemaId

columnNames

private String[] columnNames

raDeleteRule

private int raDeleteRule

raUpdateRule

private int raUpdateRule

Constructor Details

ConstraintInfo

public ConstraintInfo()

Niladic constructor for Formattable

ConstraintInfo

public ConstraintInfo(String tableName,
 SchemaDescriptor tableSd,
 String[] columnNames,
 int raDeleteRule,
 int raUpdateRule)

Consructor

Method Details

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Write this object out

Specified by:

writeExternal in interface Externalizable

Parameters:

out - write bytes here

Throws:

IOException - thrown on error

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Read this object from a stream of stored objects.

Specified by:

readExternal in interface Externalizable

Parameters:

in - read this.

Throws:

IOException - thrown on error

ClassNotFoundException - 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

toString

public String toString()

///////////////////////////////////////////////////////////

Overrides:

toString in class Object

getReferencedTableSchemaDescriptor

public SchemaDescriptor getReferencedTableSchemaDescriptor(DataDictionary dd)
                                                    throws StandardException

Description copied from interface: ConsInfo

This ConsInfo describes columns in a referenced table. What is the schema that the referenced table lives in?

Specified by:

getReferencedTableSchemaDescriptor in interface ConsInfo

Parameters:

dd - data dictionary to search for schema

Returns:

schema that referenced table lives in

Throws:

StandardException - thrown on oops

getReferencedTableDescriptor

public TableDescriptor getReferencedTableDescriptor(DataDictionary dd)
                                             throws StandardException

Description copied from interface: ConsInfo

This ConsInfo describes columns in a referenced table. What is that table?

Specified by:

getReferencedTableDescriptor in interface ConsInfo

Parameters:

dd - data dictionary to search for table

Returns:

referenced table

Throws:

StandardException - thrown on oops

getReferencedColumnNames

public String[] getReferencedColumnNames()

This ConsInfo describes columns in a referenced table. What are their names?

Specified by:

getReferencedColumnNames in interface ConsInfo

Returns:

array of referenced column names

getReferencedTableName

public String getReferencedTableName()

Get the name of the table that these column live in.

Specified by:

getReferencedTableName in interface ConsInfo

Returns:

referenced table name

getReferentialActionUpdateRule

public int getReferentialActionUpdateRule()

Get the referential Action for an Update.

Specified by:

getReferentialActionUpdateRule in interface ConsInfo

Returns:

referential Action for update

getReferentialActionDeleteRule

public int getReferentialActionDeleteRule()

Get the referential Action for a Delete.

Specified by:

getReferentialActionDeleteRule in interface ConsInfo

Returns:

referential Action Delete rule