org.apache.cayenne.dba
Interface PkGenerator

All Known Implementing Classes:
DB2PkGenerator, DerbyPkGenerator, FirebirdPkGenerator, FrontBasePkGenerator, IngresPkGenerator, JdbcPkGenerator, MySQLPkGenerator, OpenBasePkGenerator, OraclePkGenerator, PostgresPkGenerator, SybasePkGenerator

public interface PkGenerator

Defines methods to support automatic primary key generation.

Author:
Andrei Adamchik

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.
 void dropAutoPk(DataNode node, java.util.List dbEntities)
          Drops any common database objects associated with automatic primary key generation process.
 java.util.List dropAutoPkStatements(java.util.List dbEntities)
          Returns SQL string needed to drop database objects associated with automatic primary key generation.
 java.lang.Object generatePkForDbEntity(DataNode dataNode, DbEntity ent)
          Generates new (unique and non-repeating) primary key for specified DbEntity.
 java.lang.String generatePkForDbEntityString(DbEntity ent)
          Deprecated. Since 1.2. This method is not used.
 void reset()
          Resets any cached primary keys forcing generator to go to the database next time id generation is requested.
 

Method Detail

createAutoPk

void createAutoPk(DataNode node,
                  java.util.List dbEntities)
                  throws java.lang.Exception
Generates necessary database objects to provide automatic primary key support.

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

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. No actual database operations are performed.


dropAutoPk

void dropAutoPk(DataNode node,
                java.util.List dbEntities)
                throws java.lang.Exception
Drops any common database objects associated with automatic primary key generation process. This may be lookup tables, special stored procedures or sequences.

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

java.util.List dropAutoPkStatements(java.util.List dbEntities)
Returns SQL string needed to drop database objects associated with automatic primary key generation. No actual database operations are performed.


generatePkForDbEntity

java.lang.Object generatePkForDbEntity(DataNode dataNode,
                                       DbEntity ent)
                                       throws java.lang.Exception
Generates new (unique and non-repeating) primary key for specified DbEntity.

Parameters:
ent - DbEntity for which automatic PK is generated.
Throws:
java.lang.Exception

generatePkForDbEntityString

java.lang.String generatePkForDbEntityString(DbEntity ent)
Deprecated. Since 1.2. This method is not used.

Returns SQL string that can generate new (unique and non-repeating) primary key for specified DbEntity. No actual database operations are performed.


reset

void reset()
Resets any cached primary keys forcing generator to go to the database next time id generation is requested. May not be applicable for all generator implementations.



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