Package org.apache.cayenne.dba.oracle
Class OraclePkGenerator
java.lang.Object
org.apache.cayenne.dba.JdbcPkGenerator
org.apache.cayenne.dba.oracle.OraclePkGenerator
- All Implemented Interfaces:
PkGenerator
- Direct Known Subclasses:
DB2PkGenerator,DerbyPkGenerator,H2PkGenerator,IngresPkGenerator,PostgresPkGenerator,SQLServerPkGenerator
Sequence-based primary key generator implementation for Oracle. Uses Oracle
sequences to generate primary key values. This approach is at least 50%
faster when tested with Oracle compared to the lookup table approach.
When using Cayenne key caching mechanism, make sure that sequences in the database have "INCREMENT BY" greater or equal to OraclePkGenerator "pkCacheSize" property value. If this is not the case, you will need to adjust PkGenerator value accordingly. For example when sequence is incremented by 1 each time, use the following code:
dataNode.getAdapter().getPkGenerator().setPkCacheSize(1);
-
Field Summary
Fields inherited from class org.apache.cayenne.dba.JdbcPkGenerator
adapter, DEFAULT_PK_CACHE_SIZE, pkCache, pkCacheSize, pkStartValue -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoidcreateAutoPk(DataNode node, List<DbEntity> dbEntities) Generates necessary database objects to provide automatic primary key support.createAutoPkStatements(List<DbEntity> dbEntities) Creates a list of CREATE SEQUENCE statements for the list of DbEntities.protected StringvoiddropAutoPk(DataNode node, List<DbEntity> dbEntities) Drops PK sequences for all specified DbEntities.dropAutoPkStatements(List<DbEntity> dbEntities) Creates a list of DROP SEQUENCE statements for the list of DbEntities.protected StringReturns a SQL string needed to drop any database objects associated with automatic primary key generation process for a specific DbEntity.getExistingSequences(DataNode node) Fetches a list of existing sequences that might match Cayenne generated ones.protected Stringprotected longlongPkFromDatabase(DataNode node, DbEntity entity) Generates primary key by calling Oracle sequence corresponding to thedbEntity.protected intpkCacheSize(DbEntity entity) protected Stringprotected StringselectNextValQuery(String pkGeneratingSequenceName) protected StringsequenceName(DbEntity entity) Returns expected primary key sequence name for a DbEntity.Methods inherited from class org.apache.cayenne.dba.JdbcPkGenerator
autoPkTableExists, dropAutoPkString, generatePk, getAdapter, getPkCacheSize, pkCreateString, pkDeleteString, pkSelectString, pkTableCreateString, pkUpdateString, reset, runUpdate, setAdapter, setPkCacheSize
-
Constructor Details
-
OraclePkGenerator
public OraclePkGenerator()Used by DI- Since:
- 4.1
-
OraclePkGenerator
-
-
Method Details
-
createAutoPk
Description copied from interface:PkGeneratorGenerates necessary database objects to provide automatic primary key support.- Specified by:
createAutoPkin interfacePkGenerator- Overrides:
createAutoPkin classJdbcPkGenerator- Parameters:
node- node that provides access to a DataSource.dbEntities- a list of entities that require primary key auto-generation support- Throws:
Exception
-
createAutoPkStatements
Creates a list of CREATE SEQUENCE statements for the list of DbEntities.- Specified by:
createAutoPkStatementsin interfacePkGenerator- Overrides:
createAutoPkStatementsin classJdbcPkGenerator
-
dropAutoPk
Drops PK sequences for all specified DbEntities.- Specified by:
dropAutoPkin interfacePkGenerator- Overrides:
dropAutoPkin classJdbcPkGenerator- Parameters:
node- node that provides access to a DataSource.dbEntities- a list of entities whose primary key auto-generation support should be dropped.- Throws:
Exception
-
dropAutoPkStatements
Creates a list of DROP SEQUENCE statements for the list of DbEntities.- Specified by:
dropAutoPkStatementsin interfacePkGenerator- Overrides:
dropAutoPkStatementsin classJdbcPkGenerator
-
createSequenceString
-
dropSequenceString
Returns a SQL string needed to drop any database objects associated with automatic primary key generation process for a specific DbEntity. -
selectNextValQuery
-
selectAllSequencesQuery
-
longPkFromDatabase
Generates primary key by calling Oracle sequence corresponding to thedbEntity. Executed SQL looks like this:SELECT pk_table_name.nextval FROM DUAL
- Overrides:
longPkFromDatabasein classJdbcPkGenerator- Throws:
Exception- Since:
- 3.0
-
pkCacheSize
-
sequenceName
Returns expected primary key sequence name for a DbEntity. -
getSequencePrefix
-
getExistingSequences
Fetches a list of existing sequences that might match Cayenne generated ones.- Throws:
SQLException
-