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## org.springframework.jdbc.support
Class GeneratedKeyHolder

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

All Implemented Interfaces:
  KeyHolder

    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

Constructor Summary
`GeneratedKeyHolder()` Create a new GeneratedKeyHolder with a default list.
`GeneratedKeyHolder(List<Map<String,Object>> 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<Map<String,Object>>` | `getKeyList()` Return a reference to the List that contains the keys.
`Map<String,Object>` | `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.

### GeneratedKeyHolder

    public GeneratedKeyHolder(List<Map<String,Object>> 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`

### getKeys

    public Map<String,Object> 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

### getKeyList

    public List<Map<String,Object>> 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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