Package org.datanucleus.store.schema.naming

Class DN2NamingFactory

java.lang.Object

org.datanucleus.store.schema.naming.AbstractNamingFactory

org.datanucleus.store.schema.naming.DN2NamingFactory

All Implemented Interfaces:

NamingFactory

public class DN2NamingFactory
extends AbstractNamingFactory

Naming factory used by DataNucleus v3.x onwards. Refer to DataNucleus docs, but the rules are as follows

• Class called "MyClass" will generate table name of "MYCLASS"
• Field called "myField" will generate column name of "MYFIELD"
• Datastore id field for class "MyClass" will have be "MYCLASS_ID"
• Join table will be named after the class and field, so "MyClass" with field "myField" will become a table with name "MYCLASS_MYFIELD".
• Columns of a join table will be named after the PK fields of the owner and element. So something like "MYCLASS_ID_OID" and "MYELEMENT_ID_EID"
• Discriminator field columns will, by default, be called "DISCRIMINATOR"
• Index field columns will, by default, be called "IDX"
• Version field columns will, by default, be called "VERSION"
• Adapter index field columns will, by default, be called "IDX"
• Index names will, by default, be called "{class}_{field}_IDX" or "{class}_{position}_IDX"
• Sequence names will default to being called "{seqName}_SEQ" where seqName is the 'name' of the SequenceMetaData

Note that in addition to the above rules,

• if there are limitations on length of name for a particular component then the name will be truncated.
• the name will be changed to match any specified "case" (see setNamingCase)

Field Summary

Fields inherited from class org.datanucleus.store.schema.naming.AbstractNamingFactory

clr, maxLengthByComponent, namingCase, nucCtx, quoteString, reservedWords, wordSeparator

Constructor Summary

Constructors

Constructor	Description
DN2NamingFactory(NucleusContext nucCtx)

Method Summary

Modifier and Type	Method	Description
java.lang.String	getColumnName(AbstractClassMetaData cmd, ColumnType type)	Method to return the name of the column for the specified class (version, datastore-id, discriminator etc).
java.lang.String	getColumnName(AbstractMemberMetaData mmd, ColumnType type, int position)	Method to return the name of the column for the position of the specified field.
java.lang.String	getTableName(AbstractMemberMetaData mmd)	Method to return the name of the (join) table for the specified field.

Methods inherited from class org.datanucleus.store.schema.naming.AbstractNamingFactory

getColumnName, getColumnName, getConstraintName, getConstraintName, getConstraintName, getMaximumLengthForComponent, getNameInRequiredCase, getSequenceName, getTableName, prepareIdentifierNameForUse, setMaximumLength, setNamingCase, setQuoteString, setReservedKeywords, setWordSeparator, truncate

Methods inherited from class java.lang.Object

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

Constructor Detail

DN2NamingFactory

public DN2NamingFactory(NucleusContext nucCtx)

Method Detail

getTableName

public java.lang.String getTableName(AbstractMemberMetaData mmd)

Description copied from interface: NamingFactory

Method to return the name of the (join) table for the specified field.

Parameters:

mmd - Metadata for the field/property needing a join table

Returns:

Name of the table

getColumnName

public java.lang.String getColumnName(AbstractClassMetaData cmd,
                                      ColumnType type)

Description copied from interface: NamingFactory

Method to return the name of the column for the specified class (version, datastore-id, discriminator etc).

Parameters:

cmd - Metadata for the class

type - Column type

Returns:

Name of the column

getColumnName

public java.lang.String getColumnName(AbstractMemberMetaData mmd,
                                      ColumnType type,
                                      int position)

Description copied from interface: NamingFactory

Method to return the name of the column for the position of the specified field. Normally the position will be 0 since most fields map to a single column, but where you have a FK to an object with composite id, or where the Java type maps to multiple columns then the position is used.

Parameters:

mmd - Metadata for the field

type - Type of column

position - Position of the column

Returns:

The column name