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## org.apache.cayenne.dba.db2
Class DB2PkGenerator

    java.lang.Object
      org.apache.cayenne.dba.JdbcPkGenerator
          org.apache.cayenne.dba.db2.DB2PkGenerator

All Implemented Interfaces:
  PkGenerator

    public class DB2PkGenerator

extends JdbcPkGenerator

PK Generator for IBM DB2 using sequences.

Author:
  Mario Linke, Holger Hoffstaette

Field Summary
`static java.lang.String` | `SEQUENCE_PREFIX`

Fields inherited from class org.apache.cayenne.dba.JdbcPkGenerator
`DEFAULT_PK_CACHE_SIZE, NEXT_ID, objDesc, pkCache, pkCacheSize, resultDesc`

Constructor Summary
`DB2PkGenerator()`

Method Summary
`void` | `createAutoPk(DataNode node, java.util.List dbEntities)` Generates necessary database objects to provide automatic primary key support.
`java.util.List` | `createAutoPkStatements(java.util.List dbEntities)` Returns a list of SQL strings needed to generates database objects to provide automatic primary support for the list of entities.
`protected java.lang.String` | `createSequenceString(DbEntity ent)` Creates SQL needed for creating a sequence.
`void` | `dropAutoPk(DataNode node, java.util.List dbEntities)` Drops table named "AUTO_PK_SUPPORT" if it exists in the database.
`java.util.List` | `dropAutoPkStatements(java.util.List dbEntities)` Returns SQL string needed to drop database objects associated with automatic primary key generation.
`protected java.lang.String` | `dropSequenceString(DbEntity ent)` Creates SQL needed for dropping a sequence.
`protected java.util.List` | `getExistingSequences(DataNode node)` Returns a List of all existing, accessible sequences.
`protected int` | `pkFromDatabase(DataNode node, DbEntity ent)` Creates a new PK from a sequence returned by `SELECT NEXTVAL FOR sequence_name FROM SYSIBM.SYSDUMMY1` SYSIBM.SYSDUMMY1 corresponds to DUAL in Oracle.
`protected java.lang.String` | `sequenceName(DbEntity ent)` Returns the sequence name for a given table name.

Methods inherited from class org.apache.cayenne.dba.JdbcPkGenerator
`autoPkTableExists, binaryPK, dropAutoPkString, generatePkForDbEntity, generatePkForDbEntityString, getPkCacheSize, pkCreateString, pkDeleteString, pkSelectString, pkTableCreateString, pkUpdateString, reset, runUpdate, setPkCacheSize`

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

Field Detail

### SEQUENCE_PREFIX

    public static final java.lang.String SEQUENCE_PREFIX

See Also:
  Constant Field Values

Constructor Detail

### DB2PkGenerator

    public DB2PkGenerator()

Method Detail

### createAutoPk

    public void createAutoPk(DataNode node,
                             java.util.List dbEntities)
                      throws java.lang.Exception

  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 autogeneration support
  Throws:
    `java.lang.Exception`

### createAutoPkStatements

    public java.util.List createAutoPkStatements(java.util.List 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,
                           java.util.List dbEntities)
                    throws java.lang.Exception

  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 autogeneration support should be dropped.
  Throws:
    `java.lang.Exception`

### dropAutoPkStatements

    public java.util.List dropAutoPkStatements(java.util.List dbEntities)

  Description copied from interface: `PkGenerator`
  Returns SQL string needed to drop database objects associated with automatic primary key generation. No actual database operations are performed.

  Specified by:
    `dropAutoPkStatements` in interface `PkGenerator`
  Overrides:
    `dropAutoPkStatements` in class `JdbcPkGenerator`

### sequenceName

    protected java.lang.String sequenceName(DbEntity ent)

  Returns the sequence name for a given table name.

### createSequenceString

    protected java.lang.String createSequenceString(DbEntity ent)

  Creates SQL needed for creating a sequence.

### dropSequenceString

    protected java.lang.String dropSequenceString(DbEntity ent)

  Creates SQL needed for dropping a sequence.

### pkFromDatabase

    protected int pkFromDatabase(DataNode node,
                                 DbEntity ent)
                          throws java.lang.Exception

  Creates a new PK from a sequence returned by `SELECT NEXTVAL FOR sequence_name FROM SYSIBM.SYSDUMMY1` SYSIBM.SYSDUMMY1 corresponds to DUAL in Oracle.

  Overrides:
    `pkFromDatabase` in class `JdbcPkGenerator`
  Throws:
    `java.lang.Exception`

### getExistingSequences

    protected java.util.List getExistingSequences(DataNode node)
                                           throws java.sql.SQLException

  Returns a List of all existing, accessible sequences.

  Throws:
    `java.sql.SQLException`

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