public class

SqlServerMaxValueIncrementer

extends AbstractColumnMaxValueIncrementer
java.lang.Object
   ↳ org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
     ↳ org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer
       ↳ org.springframework.jdbc.support.incrementer.SqlServerMaxValueIncrementer

Class Overview

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.

Example:

 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!

Summary

[Expand]
Inherited Fields
From class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
Public Constructors
SqlServerMaxValueIncrementer()
Default constructor for bean property style usage.
SqlServerMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName)
Convenience constructor.
Protected Methods
synchronized long getNextKey()
Determine the next key to use, as a long.
[Expand]
Inherited Methods
From class org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer
From class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
From class java.lang.Object
From interface org.springframework.beans.factory.InitializingBean
From interface org.springframework.jdbc.support.incrementer.DataFieldMaxValueIncrementer

Public Constructors

public SqlServerMaxValueIncrementer ()

Default constructor for bean property style usage.

public SqlServerMaxValueIncrementer (DataSource dataSource, String incrementerName, String columnName)

Convenience constructor.

Parameters
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

Protected Methods

protected synchronized long getNextKey ()

Determine the next key to use, as a long.

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