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.
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 valuesIf "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!
paddingLength| Constructor and Description |
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SqlServerMaxValueIncrementer()
Default constructor for bean property style usage.
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SqlServerMaxValueIncrementer(DataSource dataSource,
String incrementerName,
String columnName)
Convenience constructor.
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| Modifier and Type | Method and Description |
|---|---|
protected long |
getNextKey()
Determine the next key to use, as a long.
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afterPropertiesSet, getCacheSize, getColumnName, setCacheSize, setColumnNamegetDataSource, getIncrementerName, getPaddingLength, nextIntValue, nextLongValue, nextStringValue, setDataSource, setIncrementerName, setPaddingLengthpublic SqlServerMaxValueIncrementer()
public SqlServerMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName)
dataSource - the DataSource to useincrementerName - the name of the sequence/table to usecolumnName - the name of the column in the sequence table to useprotected long getNextKey()
throws DataAccessException
AbstractDataFieldMaxValueIncrementergetNextKey in class AbstractDataFieldMaxValueIncrementerDataAccessException