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

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org.springframework.jdbc.support
Class GeneratedKeyHolder

java.lang.Object
  org.springframework.jdbc.support.GeneratedKeyHolder

All Implemented Interfaces:

KeyHolder

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public class GeneratedKeyHolder
extends Object
implements KeyHolder

Default implementation of the KeyHolder interface, to be used for holding auto-generated keys (as potentially returned by JDBC insert statements).

Create an instance of this class for each insert operation, and pass it to the corresponding JdbcTemplate or {org.springframework.jdbc.object.SqlUpdate} methods.

Since:

1.1

Author:

Thomas Risberg, Juergen Hoeller

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Constructor Summary
GeneratedKeyHolder()           Create a new GeneratedKeyHolder with a default list.
GeneratedKeyHolder(List keyList)           Create a new GeneratedKeyHolder with a given list.

 

Method Summary
Number	getKey()           Retrieve the first item from the first map, assuming that there is just one item and just one map, and that the item is a number.
List	getKeyList()           Return a reference to the List that contains the keys.
Map	getKeys()           Retrieve the first map of keys.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

GeneratedKeyHolder

public GeneratedKeyHolder()

Create a new GeneratedKeyHolder with a default list.

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GeneratedKeyHolder

public GeneratedKeyHolder(List keyList)

Create a new GeneratedKeyHolder with a given list.

Parameters:

keyList - a list to hold maps of keys

Method Detail

getKey

public Number getKey()
              throws InvalidDataAccessApiUsageException,
                     DataRetrievalFailureException

Description copied from interface: KeyHolder

Retrieve the first item from the first map, assuming that there is just one item and just one map, and that the item is a number. This is the typical case: a single, numeric generated key.

Keys are held in a List of Maps, where each item in the list represents the keys for each row. If there are multiple columns, then the Map will have multiple entries as well. If this method encounters multiple entries in either the map or the list meaning that multiple keys were returned, then an InvalidDataAccessApiUsageException is thrown.

Specified by:

getKey in interface KeyHolder

Returns:

the generated key

Throws:

InvalidDataAccessApiUsageException - if multiple keys are encountered.

DataRetrievalFailureException

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getKeys

public Map getKeys()
            throws InvalidDataAccessApiUsageException

Description copied from interface: KeyHolder

Retrieve the first map of keys. If there are multiple entries in the list (meaning that multiple rows had keys returned), then an InvalidDataAccessApiUsageException is thrown.

Specified by:

getKeys in interface KeyHolder

Returns:

the Map of generated keys

Throws:

InvalidDataAccessApiUsageException - if keys for multiple rows are encountered

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getKeyList

public List getKeyList()

Description copied from interface: KeyHolder

Return a reference to the List that contains the keys. Can be used for extracting keys for multiple rows (an unusual case), and also for adding new maps of keys.

Specified by:

getKeyList in interface KeyHolder

Returns:

the List for the generated keys, with each entry being a Map of column names and key values

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