jmind.core.jdbc

类 MySQLSeq

java.lang.Object

org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer

org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer

jmind.core.jdbc.MySQLSeq

所有已实现的接口:

org.springframework.beans.factory.InitializingBean, org.springframework.jdbc.support.incrementer.DataFieldMaxValueIncrementer

public class MySQLSeq
extends org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer

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.

作者:

wbxie mysql 序列实现 2014-3-12

字段概要

从类继承的字段 org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer

paddingLength

构造器概要

构造器

构造器和说明
MySQLSeq(javax.sql.DataSource dataSource, java.lang.String incrementerName, java.lang.String columnName) Convenience constructor.
MySQLSeq(javax.sql.DataSource dataSource, java.lang.String incrementerName, java.lang.String columnName, int increment, java.lang.String query)

方法概要

限定符和类型	方法和说明
protected long	getNextKey()
long	getNextKey(java.lang.String query)
long	getNextKey(java.lang.String tableName, java.lang.String query) 适用于分表分库 2014-3-12

从类继承的方法 org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer

afterPropertiesSet, getCacheSize, getColumnName, setCacheSize, setColumnName

从类继承的方法 org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer

getDataSource, getIncrementerName, getPaddingLength, nextIntValue, nextLongValue, nextStringValue, setDataSource, setIncrementerName, setPaddingLength

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

MySQLSeq

public MySQLSeq(javax.sql.DataSource dataSource,
                java.lang.String incrementerName,
                java.lang.String columnName)

Convenience constructor.

参数:

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

MySQLSeq

public MySQLSeq(javax.sql.DataSource dataSource,
                java.lang.String incrementerName,
                java.lang.String columnName,
                int increment,
                java.lang.String query)

方法详细资料

getNextKey

protected long getNextKey()
                   throws org.springframework.dao.DataAccessException

指定者:

getNextKey 在类中 org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer

抛出:

org.springframework.dao.DataAccessException

getNextKey

public long getNextKey(java.lang.String query)

getNextKey

public long getNextKey(java.lang.String tableName,
                       java.lang.String query)
                throws org.springframework.dao.DataAccessException

适用于分表分库 2014-3-12

参数:

tableName -

query -

返回:

抛出:

org.springframework.dao.DataAccessException