Class SqlServerMaxValueIncrementer

  extended by
      extended by
          extended by
All Implemented Interfaces:
InitializingBean, DataFieldMaxValueIncrementer

public class SqlServerMaxValueIncrementer
extends AbstractColumnMaxValueIncrementer

DataFieldMaxValueIncrementer that increments the maximum value of a given SQL Server table with the equivalent of an auto-increment column. Note: If you use this class, your Derby key column should NOT be defined as an IDENTITY column, as the sequence table does the job.

This class is inteded to be used with Microsoft SQL Server.

The sequence is kept in a table. There should be one sequence table per table that needs an auto-generated key.


 create table tab (id int not null primary key, text varchar(100))
 create table tab_sequence (id bigint identity)
 insert into tab_sequence default values
If "cacheSize" is set, the intermediate values are served without querying the database. If the server or your application is stopped or crashes or a transaction is rolled back, the unused values will never be served. The maximum hole size in numbering is consequently the value of cacheSize. HINT: Since Microsoft SQL Server supports the JDBC 3.0 getGeneratedKeys method, it is recommended to use IDENTITY columns directly in the tables and then using a SimpleJdbcInsert or utilizing a KeyHolder when calling the with the update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder) method of the JdbcTemplate.

Thanks to Preben Nilsson for the suggestion!

Thomas Risberg

Field Summary
Fields inherited from class
Constructor Summary
          Default constructor for bean property style usage.
SqlServerMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName)
          Convenience constructor.
Method Summary
protected  long getNextKey()
          Determine the next key to use, as a long.
Methods inherited from class
afterPropertiesSet, getCacheSize, getColumnName, setCacheSize, setColumnName
Methods inherited from class
getDataSource, getIncrementerName, getPaddingLength, nextIntValue, nextLongValue, nextStringValue, setDataSource, setIncrementerName, setPaddingLength
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public SqlServerMaxValueIncrementer()
Default constructor for bean property style usage.

See Also:
AbstractDataFieldMaxValueIncrementer.setDataSource(javax.sql.DataSource), AbstractDataFieldMaxValueIncrementer.setIncrementerName(java.lang.String), AbstractColumnMaxValueIncrementer.setColumnName(java.lang.String)


public SqlServerMaxValueIncrementer(DataSource dataSource,
                                    String incrementerName,
                                    String columnName)
Convenience constructor.

dataSource - the DataSource to use
incrementerName - the name of the sequence/table to use
columnName - the name of the column in the sequence table to use
Method Detail


protected long getNextKey()
                   throws DataAccessException
Description copied from class: AbstractDataFieldMaxValueIncrementer
Determine the next key to use, as a long.

Specified by:
getNextKey in class AbstractDataFieldMaxValueIncrementer
the key to use as a long. It will eventually be converted later in another format by the public concrete methods of this class.

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