org.springframework.orm.hibernate3.support

## Class BlobStringType

- java.lang.Object
- - org.springframework.orm.hibernate3.support.AbstractLobType
  - - org.springframework.orm.hibernate3.support.BlobStringType

- All Implemented Interfaces:
    UserType

      public class BlobStringType
      extends AbstractLobType

  Hibernate UserType implementation for Strings that get mapped to BLOBs. Retrieves the LobHandler to use from LocalSessionFactoryBean at config time.

  This is intended for the (arguably unnatural, but still common) case where character data is stored in a binary LOB. This requires encoding and decoding the characters within this UserType; see the javadoc of the `getCharacterEncoding()` method.

  Can also be defined in generic Hibernate mappings, as DefaultLobCreator will work with most JDBC-compliant database drivers. In this case, the field type does not have to be BLOB: For databases like MySQL and MS SQL Server, any large enough binary type will work.

  Since:
    1.2.7
  Author:
    Juergen Hoeller
  See Also:
    `getCharacterEncoding()`, `LocalSessionFactoryBean.setLobHandler(org.springframework.jdbc.support.lob.LobHandler)`

- - ### Field Summary

    - ### Fields inherited from class org.springframework.orm.hibernate3.support.AbstractLobType

      `logger`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `` | `BlobStringType()` Constructor used by Hibernate: fetches config-time LobHandler and config-time JTA TransactionManager from LocalSessionFactoryBean.
    `protected` | `BlobStringType(LobHandler lobHandler, TransactionManager jtaTransactionManager)` Constructor used for testing: takes an explicit LobHandler and an explicit JTA TransactionManager (can be `null`).

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected String` | `getCharacterEncoding()` Determine the character encoding to apply to the BLOB's bytes to turn them into a String.
    `protected Object` | `nullSafeGetInternal(ResultSet rs, String[] names, Object owner, LobHandler lobHandler)` Template method to extract a value from the given result set.
    `protected void` | `nullSafeSetInternal(PreparedStatement ps, int index, Object value, LobCreator lobCreator)` Template method to set the given parameter value on the given statement.
    `Class` | `returnedClass()`
    `int[]` | `sqlTypes()`

    - ### Methods inherited from class org.springframework.orm.hibernate3.support.AbstractLobType

      `assemble, deepCopy, disassemble, equals, hashCode, isMutable, nullSafeGet, nullSafeSet, replace`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface org.hibernate.usertype.UserType

      `nullSafeGet, nullSafeSet`

- - ### Constructor Detail

    - #### BlobStringType

          public BlobStringType()

      Constructor used by Hibernate: fetches config-time LobHandler and config-time JTA TransactionManager from LocalSessionFactoryBean.
      See Also:
        `LocalSessionFactoryBean.getConfigTimeLobHandler()`, `LocalSessionFactoryBean.getConfigTimeTransactionManager()`

    - #### BlobStringType

          protected BlobStringType(LobHandler lobHandler,
                        TransactionManager jtaTransactionManager)

      Constructor used for testing: takes an explicit LobHandler and an explicit JTA TransactionManager (can be `null`).

  - ### Method Detail

    - #### sqlTypes

          public int[] sqlTypes()

    - #### returnedClass

          public Class returnedClass()

    - #### nullSafeGetInternal

          protected Object nullSafeGetInternal(ResultSet rs,
                                   String[] names,
                                   Object owner,
                                   LobHandler lobHandler)
                                        throws SQLException,
                                               UnsupportedEncodingException

      Description copied from class: `AbstractLobType`
      Template method to extract a value from the given result set.
      Specified by:
        `nullSafeGetInternal` in class `AbstractLobType`
      Parameters:
        `rs` - the ResultSet to extract from
        `names` - the column names
        `owner` - the containing entity
        `lobHandler` - the LobHandler to use
      Returns:
        the extracted value
      Throws:
        `SQLException` - if thrown by JDBC methods
        `UnsupportedEncodingException`

    - #### nullSafeSetInternal

          protected void nullSafeSetInternal(PreparedStatement ps,
                                 int index,
                                 Object value,
                                 LobCreator lobCreator)
                                      throws SQLException,
                                             UnsupportedEncodingException

      Description copied from class: `AbstractLobType`
      Template method to set the given parameter value on the given statement.
      Specified by:
        `nullSafeSetInternal` in class `AbstractLobType`
      Parameters:
        `ps` - the PreparedStatement to set on
        `index` - the statement parameter index
        `value` - the value to set
        `lobCreator` - the LobCreator to use
      Throws:
        `SQLException` - if thrown by JDBC methods
        `UnsupportedEncodingException`

    - #### getCharacterEncoding

          protected String getCharacterEncoding()

      Determine the character encoding to apply to the BLOB's bytes to turn them into a String.

      Default is `null`, indicating to use the platform default encoding. To be overridden in subclasses for a specific encoding such as "ISO-8859-1" or "UTF-8".

      Returns:
        the character encoding to use, or `null` to use the platform default encoding
      See Also:
        `String.String(byte[], String)`, `String.getBytes(String)`