java.lang.Object
- org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer
- - org.springframework.jdbc.support.incrementer.AbstractColumnMaxValueIncrementer
  - - org.springframework.jdbc.support.incrementer.AbstractIdentityColumnMaxValueIncrementer
    - - org.springframework.jdbc.support.incrementer.DerbyMaxValueIncrementer

所有已实现的接口:
InitializingBean, DataFieldMaxValueIncrementer
```
public class DerbyMaxValueIncrementer
extends AbstractIdentityColumnMaxValueIncrementer
```
DataFieldMaxValueIncrementer that increments the maximum value of a given Derby 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.
The sequence is kept in a table. There should be one sequence table per table that needs an auto-generated key.
Derby requires an additional column to be used for the insert since it is impossible to insert a null into the identity column and have the value generated. This is solved by providing the name of a dummy column that also must be created in the sequence table.
Example:
```
create table tab (id int not null primary key, text varchar(100));
 create table tab_sequence (value int generated always as identity, dummy char(1));
 insert into tab_sequence (dummy) values(null);
```
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. HINT: Since Derby supports the JDBC 3.0 getGeneratedKeys method, it is recommended to use IDENTITY columns directly in the tables and then utilizing a KeyHolder when calling the with the update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder) method of the JdbcTemplate.
Thanks to Endre Stolsvik for the suggestion!
从以下版本开始:
2.5
作者:
Thomas Risberg, Juergen Hoeller

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	说明
`DerbyMaxValueIncrementer()`	Default constructor for bean property style usage.
`DerbyMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName)`	Convenience constructor.
`DerbyMaxValueIncrementer(DataSource dataSource, String incrementerName, String columnName, String dummyName)`	Convenience constructor.

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`String`	`getDummyName()`	Return the name of the dummy column.
`protected String`	`getIdentityStatement()`	Statement to use to obtain the current identity value.
`protected String`	`getIncrementStatement()`	Statement to use to increment the "sequence" value.
`void`	`setDummyName(String dummyName)`	Set the name of the dummy column.

从类继承的方法 org.springframework.jdbc.support.incrementer.AbstractIdentityColumnMaxValueIncrementer
getDeleteStatement, getNextKey, isDeleteSpecificValues, setDeleteSpecificValues

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
  - DerbyMaxValueIncrementer
```
public DerbyMaxValueIncrementer()
```
    Default constructor for bean property style usage.
    另请参阅:
    AbstractDataFieldMaxValueIncrementer.setDataSource(javax.sql.DataSource), AbstractDataFieldMaxValueIncrementer.setIncrementerName(java.lang.String), AbstractColumnMaxValueIncrementer.setColumnName(java.lang.String)
  - DerbyMaxValueIncrementer
```
public DerbyMaxValueIncrementer(DataSource dataSource,
                                String incrementerName,
                                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
  - DerbyMaxValueIncrementer
```
public DerbyMaxValueIncrementer(DataSource dataSource,
                                String incrementerName,
                                String columnName,
                                String dummyName)
```
    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
    dummyName - the name of the dummy column used for inserts
- 方法详细资料
  - setDummyName
```
public void setDummyName(String dummyName)
```
    Set the name of the dummy column.
  - getDummyName
```
public String getDummyName()
```
    Return the name of the dummy column.
  - getIncrementStatement
```
protected String getIncrementStatement()
```
    从类复制的说明: AbstractIdentityColumnMaxValueIncrementer
    Statement to use to increment the "sequence" value.
    指定者:
    getIncrementStatement 在类中 AbstractIdentityColumnMaxValueIncrementer
    返回:
    the SQL statement to use
  - getIdentityStatement
```
protected String getIdentityStatement()
```
    从类复制的说明: AbstractIdentityColumnMaxValueIncrementer
    Statement to use to obtain the current identity value.
    指定者:
    getIdentityStatement 在类中 AbstractIdentityColumnMaxValueIncrementer
    返回:
    the SQL statement to use

类 DerbyMaxValueIncrementer

字段概要

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

构造器概要

方法概要

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

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

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

从类继承的方法 java.lang.Object

构造器详细资料

DerbyMaxValueIncrementer

DerbyMaxValueIncrementer

DerbyMaxValueIncrementer

方法详细资料

setDummyName

getDummyName

getIncrementStatement

getIdentityStatement