MySQLMaxValueIncrementer

Class Overview

DataFieldMaxValueIncrementer that increments the 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.

Summary

[Expand] Inherited Fields
From class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer protected int paddingLength The length to which a string result should be pre-pended with zeroes

Public Constructors
	MySQLMaxValueIncrementer() Default constructor for bean property style usage.
	MySQLMaxValueIncrementer(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 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. void setCacheSize(int cacheSize) Set the number of buffered keys. void setColumnName(String columnName) Set the name of the column in the sequence table.
From class org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer void afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware). DataSource getDataSource() Return the data source to retrieve the value from. String getIncrementerName() Return the name of the sequence/table. abstract long getNextKey() Determine the next key to use, as a long. int getPaddingLength() Return the padding length for String values. int nextIntValue() Increment the data store field's max value as int. long nextLongValue() Increment the data store field's max value as long. String nextStringValue() Increment the data store field's max value as String. void setDataSource(DataSource dataSource) Set the data source to retrieve the value from. void setIncrementerName(String incrementerName) Set the name of the sequence/table. void setPaddingLength(int paddingLength) Set the padding length, i.e.
From class java.lang.Object Object clone() boolean equals(Object arg0) void finalize() final Class<?> getClass() int hashCode() final void notify() final void notifyAll() String toString() final void wait() final void wait(long arg0, int arg1) final void wait(long arg0)
From interface org.springframework.beans.factory.InitializingBean abstract void afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
From interface org.springframework.jdbc.support.incrementer.DataFieldMaxValueIncrementer abstract int nextIntValue() Increment the data store field's max value as int. abstract long nextLongValue() Increment the data store field's max value as long. abstract String nextStringValue() Increment the data store field's max value as String.