MultipleHiLoPerTableGenerator (Hibernate Core Aggregator 3.6.10.Final API)

java.lang.Object
- org.hibernate.engine.TransactionHelper
- - org.hibernate.id.MultipleHiLoPerTableGenerator

All Implemented Interfaces:

Configurable, IdentifierGenerator, PersistentIdentifierGenerator
```
public class MultipleHiLoPerTableGenerator
extends TransactionHelper
implements PersistentIdentifierGenerator, Configurable
```
A hilo IdentifierGenerator that returns a Long, constructed using a hi/lo algorithm. The hi value MUST be fetched in a seperate transaction to the Session transaction so the generator must be able to obtain a new connection and commit it. Hence this implementation may not be used when the user is supplying connections. In this case a SequenceHiLoGenerator would be a better choice (where supported).

A hilo IdentifierGenerator that uses a database table to store the last generated values. A table can contains several hi values. They are distinct from each other through a key

This implementation is not compliant with a user connection

Allowed parameters (all of them are optional):
- table: table name (default hibernate_sequences)
- primary_key_column: key column name (default sequence_name)
- value_column: hi value column name(default sequence_next_hi_value)
- primary_key_value: key value for the current entity (default to the entity's primary table name)
- primary_key_length: length of the key column in DB represented as a varchar (default to 255)
- max_lo: max low value before increasing hi (default to Short.MAX_VALUE)
Author:

Emmanuel Bernard, Klaus Richarz.

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`DEFAULT_TABLE`
`static java.lang.String`	`ID_TABLE`
`static java.lang.String`	`MAX_LO`
`static java.lang.String`	`PK_COLUMN_NAME`
`static java.lang.String`	`PK_LENGTH_NAME`
`static java.lang.String`	`PK_VALUE_NAME`
`static java.lang.String`	`VALUE_COLUMN_NAME`

Fields inherited from interface org.hibernate.id.PersistentIdentifierGenerator
CATALOG, IDENTIFIER_NORMALIZER, PK, SCHEMA, SQL_STATEMENT_LOGGER, TABLE, TABLES

Fields inherited from interface org.hibernate.id.IdentifierGenerator
ENTITY_NAME

Constructor Summary

Constructors
Constructor and Description

MultipleHiLoPerTableGenerator()

Constructors
Constructor and Description
`MultipleHiLoPerTableGenerator()`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`configure(Type type, java.util.Properties params, Dialect dialect)` Configure this instance, given the value of parameters specified by the user as `<param>` elements.
`java.io.Serializable`	`doWorkInCurrentTransaction(java.sql.Connection conn, java.lang.String sql)` The work to be done
`java.io.Serializable`	`generate(SessionImplementor session, java.lang.Object obj)` Generate a new identifier.
`java.lang.Object`	`generatorKey()` Return a key unique to the underlying database objects.
`java.lang.String[]`	`sqlCreateStrings(Dialect dialect)` The SQL required to create the underlying database objects.
`java.lang.String[]`	`sqlDropStrings(Dialect dialect)` The SQL required to remove the underlying database objects.

Methods inherited from class org.hibernate.engine.TransactionHelper
doWorkInNewTransaction

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

- Field Detail
  - ID_TABLE
```
public static final java.lang.String ID_TABLE
```
    See Also:
    Constant Field Values
  - PK_COLUMN_NAME
```
public static final java.lang.String PK_COLUMN_NAME
```
    See Also:
    Constant Field Values
  - PK_VALUE_NAME
```
public static final java.lang.String PK_VALUE_NAME
```
    See Also:
    Constant Field Values
  - VALUE_COLUMN_NAME
```
public static final java.lang.String VALUE_COLUMN_NAME
```
    See Also:
    Constant Field Values
  - PK_LENGTH_NAME
```
public static final java.lang.String PK_LENGTH_NAME
```
    See Also:
    Constant Field Values
  - DEFAULT_TABLE
```
public static final java.lang.String DEFAULT_TABLE
```
    See Also:
    Constant Field Values
  - MAX_LO
```
public static final java.lang.String MAX_LO
```
    See Also:
    Constant Field Values
- Constructor Detail
  - MultipleHiLoPerTableGenerator
```
public MultipleHiLoPerTableGenerator()
```
- Method Detail
  - sqlCreateStrings
```
public java.lang.String[] sqlCreateStrings(Dialect dialect)
                                    throws HibernateException
```
    Description copied from interface: PersistentIdentifierGenerator
    
    The SQL required to create the underlying database objects.
    
    Specified by:
    
    sqlCreateStrings in interface PersistentIdentifierGenerator
    
    Parameters:
    dialect - The dialect against which to generate the create command(s)
    
    Returns:
    The create command(s)
    
    Throws:
    
    HibernateException - problem creating the create command(s)
  - sqlDropStrings
```
public java.lang.String[] sqlDropStrings(Dialect dialect)
                                  throws HibernateException
```
    Description copied from interface: PersistentIdentifierGenerator
    
    The SQL required to remove the underlying database objects.
    
    Specified by:
    
    sqlDropStrings in interface PersistentIdentifierGenerator
    
    Parameters:
    dialect - The dialect against which to generate the drop command(s)
    
    Returns:
    The drop command(s)
    
    Throws:
    
    HibernateException - problem creating the drop command(s)
  - generatorKey
```
public java.lang.Object generatorKey()
```
    Description copied from interface: PersistentIdentifierGenerator
    
    Return a key unique to the underlying database objects. Prevents us from trying to create/remove them multiple times.
    
    Specified by:
    
    generatorKey in interface PersistentIdentifierGenerator
    
    Returns:
    Object an identifying key for this generator
  - doWorkInCurrentTransaction
```
public java.io.Serializable doWorkInCurrentTransaction(java.sql.Connection conn,
                                              java.lang.String sql)
                                                throws java.sql.SQLException
```
    Description copied from class: TransactionHelper
    
    The work to be done
    
    Specified by:
    
    doWorkInCurrentTransaction in class TransactionHelper
    
    Throws:
    
    java.sql.SQLException
  - generate
```
public java.io.Serializable generate(SessionImplementor session,
                            java.lang.Object obj)
                              throws HibernateException
```
    Description copied from interface: IdentifierGenerator
    
    Generate a new identifier.
    
    Specified by:
    
    generate in interface IdentifierGenerator
    
    obj - the entity or toplevel collection for which the id is being generated
    
    Returns:
    a new identifier
    
    Throws:
    
    HibernateException
  - configure
```
public void configure(Type type,
             java.util.Properties params,
             Dialect dialect)
               throws MappingException
```
    Description copied from interface: Configurable
    
    Configure this instance, given the value of parameters specified by the user as <param> elements. This method is called just once, following instantiation.
    
    Specified by:
    
    configure in interface Configurable
    
    params - param values, keyed by parameter name
    
    Throws:
    
    MappingException

Class MultipleHiLoPerTableGenerator

Field Summary

Fields inherited from interface org.hibernate.id.PersistentIdentifierGenerator

Fields inherited from interface org.hibernate.id.IdentifierGenerator

Constructor Summary

Method Summary

Methods inherited from class org.hibernate.engine.TransactionHelper

Methods inherited from class java.lang.Object

Field Detail

ID_TABLE

PK_COLUMN_NAME

PK_VALUE_NAME

VALUE_COLUMN_NAME

PK_LENGTH_NAME

DEFAULT_TABLE

MAX_LO

Constructor Detail

MultipleHiLoPerTableGenerator

Method Detail

sqlCreateStrings

sqlDropStrings

generatorKey

doWorkInCurrentTransaction

generate

configure