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java.lang.Object org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer org.springframework.jdbc.support.incrementer.HsqlMaxValueIncrementer
public class HsqlMaxValueIncrementer
DataFieldMaxValueIncrementer
that increments the maximum value of a given HSQL table
with the equivalent of an auto-increment column. Note: If you use this class, your HSQL
key column should NOT be auto-increment, as the sequence table does the job.
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 (value identity); insert into tab_sequence values(0);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.
NOTE: HSQL now supports sequences and you should consider using them instead:
HsqlSequenceMaxValueIncrementer
HsqlSequenceMaxValueIncrementer
Field Summary | |
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private int |
nextValueIndex
The next id to serve from the value cache |
private long[] |
valueCache
The current cache of values |
Fields inherited from class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer |
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paddingLength |
Constructor Summary | |
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HsqlMaxValueIncrementer()
Default constructor for bean property style usage. |
|
HsqlMaxValueIncrementer(javax.sql.DataSource dataSource,
java.lang.String incrementerName,
java.lang.String columnName)
Convenience constructor. |
Method Summary | |
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protected long |
getNextKey()
Determine the next key to use, as a long. |
Methods inherited from class org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer |
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afterPropertiesSet, getCacheSize, getColumnName, setCacheSize, setColumnName |
Methods inherited from class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer |
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getDataSource, getIncrementerName, getPaddingLength, nextIntValue, nextLongValue, nextStringValue, setDataSource, setIncrementerName, setPaddingLength |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private long[] valueCache
private int nextValueIndex
Constructor Detail |
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public HsqlMaxValueIncrementer()
AbstractDataFieldMaxValueIncrementer.setDataSource(javax.sql.DataSource)
,
AbstractDataFieldMaxValueIncrementer.setIncrementerName(java.lang.String)
,
AbstractColumnMaxValueIncrementer.setColumnName(java.lang.String)
public HsqlMaxValueIncrementer(javax.sql.DataSource dataSource, java.lang.String incrementerName, java.lang.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 useMethod Detail |
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protected long getNextKey() throws DataAccessException
AbstractDataFieldMaxValueIncrementer
getNextKey
in class AbstractDataFieldMaxValueIncrementer
DataAccessException
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