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java.lang.Objectorg.apache.cayenne.dba.JdbcPkGenerator
org.apache.cayenne.dba.sybase.SybasePkGenerator
public class SybasePkGenerator
Primary key generator implementation for Sybase. Uses a lookup table named "AUTO_PK_SUPPORT" and a stored procedure "auto_pk_for_table" to search and increment primary keys for tables.
| Field Summary |
|---|
| Fields inherited from class org.apache.cayenne.dba.JdbcPkGenerator |
|---|
DEFAULT_PK_CACHE_SIZE, NEXT_ID, objDesc, pkCache, pkCacheSize, resultDesc |
| Constructor Summary | |
|---|---|
SybasePkGenerator()
|
|
| Method Summary | |
|---|---|
void |
createAutoPk(DataNode node,
java.util.List dbEntities)
Generates 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 database objects related to automatic primary key support. |
java.util.List |
dropAutoPkStatements(java.util.List dbEntities)
Returns SQL string needed to drop database objects associated with automatic primary key generation. |
protected int |
pkFromDatabase(DataNode node,
DbEntity ent)
Performs primary key generation ignoring cache. |
| 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 |
| Constructor Detail |
|---|
public SybasePkGenerator()
| Method Detail |
|---|
public void createAutoPk(DataNode node,
java.util.List dbEntities)
throws java.lang.Exception
1. Executed only if a corresponding table does not exist in the database.
CREATE TABLE AUTO_PK_SUPPORT (
TABLE_NAME VARCHAR(32) NOT NULL,
NEXT_ID INTEGER NOT NULL
)
2. Executed under any circumstances.
if exists (SELECT * FROM sysobjects WHERE name = 'auto_pk_for_table')
BEGIN
DROP PROCEDURE auto_pk_for_table
END
3. Executed under any circumstances.
CREATE PROCEDURE auto_pk_for_table @tname VARCHAR(32), @pkbatchsize INT AS BEGIN BEGIN TRANSACTION UPDATE AUTO_PK_SUPPORT set NEXT_ID = NEXT_ID + @pkbatchsize WHERE TABLE_NAME = @tname SELECT NEXT_ID from AUTO_PK_SUPPORT where NEXT_ID = @tname COMMIT END
createAutoPk in interface PkGeneratorcreateAutoPk in class JdbcPkGeneratornode - node that provides access to a DataSource.dbEntities - a list of entities that require primary key autogeneration
support
java.lang.Exceptionpublic java.util.List createAutoPkStatements(java.util.List dbEntities)
PkGenerator
createAutoPkStatements in interface PkGeneratorcreateAutoPkStatements in class JdbcPkGenerator
public void dropAutoPk(DataNode node,
java.util.List dbEntities)
throws java.lang.Exception
if exists (SELECT * FROM sysobjects WHERE name = 'AUTO_PK_SUPPORT')
BEGIN
DROP TABLE AUTO_PK_SUPPORT
END
if exists (SELECT * FROM sysobjects WHERE name = 'auto_pk_for_table')
BEGIN
DROP PROCEDURE auto_pk_for_table
END
dropAutoPk in interface PkGeneratordropAutoPk in class JdbcPkGeneratornode - node that provides access to a DataSource.dbEntities - a list of entities whose primary key autogeneration support
should be dropped.
java.lang.Exceptionpublic java.util.List dropAutoPkStatements(java.util.List dbEntities)
PkGenerator
dropAutoPkStatements in interface PkGeneratordropAutoPkStatements in class JdbcPkGenerator
protected int pkFromDatabase(DataNode node,
DbEntity ent)
throws java.lang.Exception
JdbcPkGeneratorThis 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".
pkFromDatabase in class JdbcPkGeneratorjava.lang.Exception
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