Package org.datanucleus.store.rdbms.valuegenerator

Class SequenceTable

java.lang.Object

org.datanucleus.store.rdbms.table.AbstractTable

org.datanucleus.store.rdbms.table.TableImpl

org.datanucleus.store.rdbms.valuegenerator.SequenceTable

All Implemented Interfaces:

Table, org.datanucleus.store.schema.table.Table

public class SequenceTable
extends TableImpl

Class defining a table for storing generated values for use with TableGenerator. The table has 2 columns : a primary key String, and a value Long.

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.table.AbstractTable

columns, columnsByIdentifier, dba, existsInDatastore, identifier, state, storeMgr, TABLE_STATE_INITIALIZED, TABLE_STATE_INITIALIZED_MODIFIED, TABLE_STATE_NEW, TABLE_STATE_PK_INITIALIZED, TABLE_STATE_VALIDATED

Constructor Summary

Constructors

Constructor	Description
SequenceTable(DatastoreIdentifier identifier, RDBMSStoreManager storeMgr, String seqNameColName, String nextValColName)	Constructor

Method Summary

Modifier and Type	Method	Description
JavaTypeMapping	getIdMapping()	Accessor for a mapping for the ID (persistable) for this table.
JavaTypeMapping	getMemberMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd)	Accessor the for the mapping for a field stored in this table
Long	getNextVal(String sequenceName, org.datanucleus.store.connection.ManagedConnection conn, int incrementBy, DatastoreIdentifier tableIdentifier, String columnName, int initialValue)	Accessor for the nextval of a sequence
void	initialize(org.datanucleus.ClassLoaderResolver clr)	Method to initialise the table.

Methods inherited from class org.datanucleus.store.rdbms.table.TableImpl

createConstraints, dropConstraints, getExpectedCandidateKeys, getExpectedForeignKeys, getExpectedIndices, getPrimaryKey, getSQLAddCandidateKeyStatements, getSQLAddFKStatements, getSQLCreateIndexStatements, getSQLCreateStatements, getSQLDropStatements, initializeColumnInfoForPrimaryKeyColumns, initializeColumnInfoFromDatastore, logMapping, validate, validateColumns, validateConstraints, validatePrimaryKey

Methods inherited from class org.datanucleus.store.rdbms.table.AbstractTable

addColumn, addColumnInternal, allowDDLOutput, assertIsInitialized, assertIsInitializedModified, assertIsPKInitialized, assertIsPKUninitialized, assertIsUninitialized, assertIsValidated, create, drop, equals, executeDdlStatement, executeDdlStatementList, exists, getCatalogName, getClassMetaData, getColumn, getColumnForName, getColumnForPosition, getColumns, getDatastoreIdentifierFullyQualified, getDiscriminatorMetaData, getIdentifier, getMemberColumnMappingForEmbeddedMember, getMemberColumnMappingForMember, getMemberColumnMappings, getName, getNumberOfColumns, getSchemaName, getStoreManager, getSurrogateColumn, getSurrogateMapping, getVersionMetaData, hasColumn, hasColumnName, hashCode, isInitialized, isInitializedModified, isPKInitialized, isValidated, postInitialize, preInitialize, tableExistsInDatastore, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SequenceTable

public SequenceTable(DatastoreIdentifier identifier,
                     RDBMSStoreManager storeMgr,
                     String seqNameColName,
                     String nextValColName)

Constructor

Parameters:

identifier - Datastore identifier for this table

storeMgr - The RDBMSManager for this datastore

seqNameColName - Name for the "sequence name" column

nextValColName - Name for the "next value" column

Method Detail

initialize

public void initialize(org.datanucleus.ClassLoaderResolver clr)

Method to initialise the table.

Parameters:

clr - The ClassLoaderResolver

getIdMapping

public JavaTypeMapping getIdMapping()

Accessor for a mapping for the ID (persistable) for this table.

Returns:

The (persistable) ID mapping.

getNextVal

public Long getNextVal(String sequenceName,
                       org.datanucleus.store.connection.ManagedConnection conn,
                       int incrementBy,
                       DatastoreIdentifier tableIdentifier,
                       String columnName,
                       int initialValue)
                throws SQLException

Accessor for the nextval of a sequence

Parameters:

conn - Connection for this datastore.

sequenceName - The sequence name (the key)

incrementBy - The amount to increment (from the current value)

tableIdentifier - Identifier for the table being incremented (used when there is no current value)

columnName - Name of the column being incremented (used when there is no current value)

initialValue - Initial value (if not using tableIdentifier/columnName to find the initial value)

Returns:

The next value that should be used

Throws:

SQLException - Thrown when an error occurs in the process.

getMemberMapping

public JavaTypeMapping getMemberMapping(org.datanucleus.metadata.AbstractMemberMetaData mmd)

Accessor the for the mapping for a field stored in this table

Parameters:

mmd - MetaData for the field whose mapping we want

Returns:

The mapping