# Class FrontBasePkGenerator

java.lang.Object
org.apache.cayenne.dba.JdbcPkGenerator
org.apache.cayenne.dba.frontbase.FrontBasePkGenerator

All Implemented Interfaces:
  `PkGenerator`

public class FrontBasePkGenerator extends JdbcPkGenerator

Since:
  1.2

- ## Field Summary

  ### Fields inherited from class JdbcPkGenerator

  `adapter, DEFAULT_PK_CACHE_SIZE, pkCache, pkCacheSize, pkStartValue`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FrontBasePkGenerator(JdbcAdapter adapter)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `createAutoPk(DataNode node, List<DbEntity> dbEntities)`
  Generates necessary database objects to provide automatic primary key support.
  `List<String>`
  `createAutoPkStatements(List<DbEntity> dbEntities)`
  Returns a list of SQL strings needed to generates database objects to provide automatic primary support for the list of entities.
  `void`
  `dropAutoPk(DataNode node, List<DbEntity> dbEntities)`
  Drops table named "AUTO_PK_SUPPORT" if it exists in the database.
  `protected String`
  `dropAutoPkString()`
  `int`
  `getPkCacheSize()`
  Returns zero as PK caching is not supported by FrontBaseAdapter.
  `protected long`
  `longPkFromDatabase(DataNode node, DbEntity entity)`
  Performs primary key generation ignoring cache.
  `protected String`
  `pkCreateString(String entName)`
  `protected String`
  `pkDeleteString(List<DbEntity> dbEntities)`
  `protected String`
  `pkSelectString(String entName)`
  `protected String`
  `pkTableCreateString()`
  `protected String`
  `pkUpdateString(String entName)`

  ### Methods inherited from class JdbcPkGenerator

  `autoPkTableExists, dropAutoPkStatements, generatePk, getAdapter, reset, runUpdate, setPkCacheSize`

  ### Methods inherited from class Object

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

  ### Methods inherited from interface PkGenerator

  `generatePk`

- ## Constructor Details

  - ### FrontBasePkGenerator

    public FrontBasePkGenerator(JdbcAdapter adapter)

- ## Method Details

  - ### getPkCacheSize

    public int getPkCacheSize()
    Returns zero as PK caching is not supported by FrontBaseAdapter.
    Overrides:
      `getPkCacheSize` in class `JdbcPkGenerator`

  - ### createAutoPk

    public void createAutoPk(DataNode node, List<DbEntity> dbEntities)
    Description copied from interface: `PkGenerator`
    Generates necessary database objects to provide automatic primary key support.
    Specified by:
      `createAutoPk` in interface `PkGenerator`
    Overrides:
      `createAutoPk` in class `JdbcPkGenerator`
    Parameters:
      `node` - node that provides access to a DataSource.
      `dbEntities` - a list of entities that require primary key auto-generation support

  - ### createAutoPkStatements

    public List<String> createAutoPkStatements(List<DbEntity> dbEntities)
    Description copied from interface: `PkGenerator`
    Returns a list of SQL strings needed to generates database objects to provide automatic primary support for the list of entities. No actual database operations are performed.
    Specified by:
      `createAutoPkStatements` in interface `PkGenerator`
    Overrides:
      `createAutoPkStatements` in class `JdbcPkGenerator`

  - ### dropAutoPk

    public void dropAutoPk(DataNode node, List<DbEntity> dbEntities)
    Description copied from class: `JdbcPkGenerator`
    Drops table named "AUTO_PK_SUPPORT" if it exists in the database.
    Specified by:
      `dropAutoPk` in interface `PkGenerator`
    Overrides:
      `dropAutoPk` in class `JdbcPkGenerator`
    Parameters:
      `node` - node that provides access to a DataSource.
      `dbEntities` - a list of entities whose primary key auto-generation support should be dropped.

  - ### pkTableCreateString

    protected String pkTableCreateString()
    Overrides:
      `pkTableCreateString` in class `JdbcPkGenerator`

  - ### pkDeleteString

    protected String pkDeleteString(List<DbEntity> dbEntities)
    Overrides:
      `pkDeleteString` in class `JdbcPkGenerator`

  - ### pkCreateString

    protected String pkCreateString(String entName)
    Overrides:
      `pkCreateString` in class `JdbcPkGenerator`

  - ### pkSelectString

    protected String pkSelectString(String entName)
    Overrides:
      `pkSelectString` in class `JdbcPkGenerator`

  - ### pkUpdateString

    protected String pkUpdateString(String entName)
    Overrides:
      `pkUpdateString` in class `JdbcPkGenerator`

  - ### dropAutoPkString

    protected String dropAutoPkString()
    Overrides:
      `dropAutoPkString` in class `JdbcPkGenerator`

  - ### longPkFromDatabase

    protected long longPkFromDatabase(DataNode node, DbEntity entity)
    Description copied from class: `JdbcPkGenerator`
    Performs primary key generation ignoring cache. Generates a range of primary keys as specified by "pkCacheSize" bean property.

    This method is called internally from "generatePkForDbEntity" and then generated range of key values is saved in cache for performance. Subclasses that implement different primary key generation solutions should override this method, not "generatePkForDbEntity".

    Overrides:
      `longPkFromDatabase` in class `JdbcPkGenerator`
    Since:
      3.0