MySQLMaxValueIncrementer (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.jdbc.support.incrementer
Class MySQLMaxValueIncrementer

java.lang.Object
  org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
      org.springframework.jdbc.support.incrementer.MySQLMaxValueIncrementer

All Implemented Interfaces:: InitializingBean, DataFieldMaxValueIncrementer

public class MySQLMaxValueIncrementer
extends AbstractDataFieldMaxValueIncrementer
extends AbstractDataFieldMaxValueIncrementer

Class to increment maximum value of a given MySQL table with the equivalent of an auto-increment column. Note: If you use this class, your MySQL 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. The table type of the sequence table should be MyISAM so the sequences are allocated without regard to any transactions that might be in progress.

Example:

create table tab (id int unsigned not null primary key, text varchar(100));
 create table tab_sequence (value int not null) type=MYISAM;
 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.

Author:: Jean-Pierre Pawlak, Thomas Risberg, Juergen Hoeller

Field Summary

Fields inherited from class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer

paddingLength

Constructor Summary

MySQLMaxValueIncrementer()
          Default constructor.

MySQLMaxValueIncrementer(DataSource ds, String incrementerName, String columnName)
          Convenience constructor.

Method Summary

void afterPropertiesSet()
          Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

int getCacheSize()
          Return the number of buffered keys.

String getColumnName()
          Return the name of the column in the sequence table.

protected long getNextKey()
          Determine the next key to use, as a long.

void setCacheSize(int cacheSize)
          Set the number of buffered keys.

void setColumnName(String columnName)
          Set the name of the column in the sequence table.

Methods inherited from class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer

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

Fields inherited from class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
`paddingLength`

Constructor Summary
`MySQLMaxValueIncrementer()` Default constructor.
`MySQLMaxValueIncrementer(DataSource ds, String incrementerName, String columnName)` Convenience constructor.

Method Summary
`void`	`afterPropertiesSet()` Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
`int`	`getCacheSize()` Return the number of buffered keys.
`String`	`getColumnName()` Return the name of the column in the sequence table.
`protected long`	`getNextKey()` Determine the next key to use, as a long.
`void`	`setCacheSize(int cacheSize)` Set the number of buffered keys.
`void`	`setColumnName(String columnName)` Set the name of the column in the sequence table.

Methods inherited from class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
`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