Examples of org.springframework.jdbc.support.lob.LobHandler

Package org.springframework.jdbc.support.lob

Examples of org.springframework.jdbc.support.lob.LobHandler

org.springframework.jdbc.support.lob.LobHandler
Abstraction for handling large binary fields and large text fields in specific databases, no matter if represented as simple types or Large OBjects. Its main purpose is to isolate Oracle's peculiar handling of LOBs in {@link OracleLobHandler}; most other databases should be able to work with the provided {@link DefaultLobHandler}.
Provides accessor methods for BLOBs and CLOBs, and acts as factory for LobCreator instances, to be used as sessions for creating BLOBs or CLOBs. LobCreators are typically instantiated for each statement execution or for each transaction. They are not thread-safe because they might track allocated database resources to be able to free them after execution.
Most databases/drivers should be able to work with {@link DefaultLobHandler}, which by default delegates to JDBC's direct accessor methods, avoiding java.sql.Blob and java.sql.Clob completely. {@link DefaultLobHandler} can also be configured to populate LOBs usingPreparedStatement.setBlob/setClob (e.g. for PostgreSQL).
Unfortunately, Oracle 9i just accepts Blob/Clob instances created via its own proprietary BLOB/CLOB API, and additionally doesn't accept large streams for PreparedStatement's corresponding setter methods. Therefore, you need to use {@link OracleLobHandler} there, which uses Oracle's BLOB/CLOB API for both all access.The Oracle 10g JDBC driver should basically work with {@link DefaultLobHandler}as well, with some limitations in terms of LOB sizes.
Of course, you need to declare different field types for each database. In Oracle, any binary content needs to go into a BLOB, and all character content beyond 4000 bytes needs to go into a CLOB. In MySQL, there is no notion of a CLOB type but rather a LONGTEXT type that behaves like a VARCHAR. For complete portability, use a LobHandler for fields that might typically require LOBs on some database because of the field size (take Oracle's numbers as a guideline).
Summarizing the recommended options (for actual LOB fields):
- JDBC 4.0 driver: {@link DefaultLobHandler} with streamAsLob=true.
- PostgreSQL: {@link DefaultLobHandler} with wrapAsLob=true.
- Oracle 9i/10g: {@link OracleLobHandler} with a connection-pool-specific{@link OracleLobHandler#setNativeJdbcExtractor NativeJdbcExtractor}.
- For all other database drivers (and for non-LOB fields that might potentially turn into LOBs on some databases): a plain {@link DefaultLobHandler}.
@author Juergen Hoeller @since 23.12.2003 @see DefaultLobHandler @see OracleLobHandler @see java.sql.ResultSet#getBlob @see java.sql.ResultSet#getClob @see java.sql.ResultSet#getBytes @see java.sql.ResultSet#getBinaryStream @see java.sql.ResultSet#getString @see java.sql.ResultSet#getAsciiStream @see java.sql.ResultSet#getCharacterStream

 * @since 17.12.2003
 */
public class DefaultLobHandlerTests extends TestCase {


  public void testGetBlobAsBytes() throws SQLException {
    LobHandler lobHandler = new DefaultLobHandler();
    MockControl rsControl = MockControl.createControl(ResultSet.class);
    ResultSet rs = (ResultSet) rsControl.getMock();
    rs.getBytes(1);
    rsControl.setReturnValue(null);
    rsControl.replay();
    lobHandler.getBlobAsBytes(rs, 1);
    rsControl.verify();
  }

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    lobHandler.getBlobAsBytes(rs, 1);
    rsControl.verify();
  }


  public void testGetBlobAsBinaryStream() throws SQLException {
    LobHandler lobHandler = new DefaultLobHandler();
    MockControl rsControl = MockControl.createControl(ResultSet.class);
    ResultSet rs = (ResultSet) rsControl.getMock();
    rs.getBinaryStream(1);
    rsControl.setReturnValue(null);
    rsControl.replay();
    lobHandler.getBlobAsBinaryStream(rs, 1);
    rsControl.verify();
  }

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    lobHandler.getBlobAsBinaryStream(rs, 1);
    rsControl.verify();
  }


  public void testGetClobAsString() throws SQLException {
    LobHandler lobHandler = new DefaultLobHandler();
    MockControl rsControl = MockControl.createControl(ResultSet.class);
    ResultSet rs = (ResultSet) rsControl.getMock();
    rs.getString(1);
    rsControl.setReturnValue(null);
    rsControl.replay();
    lobHandler.getClobAsString(rs, 1);
    rsControl.verify();
  }

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    lobHandler.getClobAsString(rs, 1);
    rsControl.verify();
  }


  public void testGetClobAsAsciiStream() throws SQLException {
    LobHandler lobHandler = new DefaultLobHandler();
    MockControl rsControl = MockControl.createControl(ResultSet.class);
    ResultSet rs = (ResultSet) rsControl.getMock();
    rs.getAsciiStream(1);
    rsControl.setReturnValue(null);
    rsControl.replay();
    lobHandler.getClobAsAsciiStream(rs, 1);
    rsControl.verify();
  }

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    lobHandler.getClobAsAsciiStream(rs, 1);
    rsControl.verify();
  }


  public void testGetClobAsCharacterStream() throws SQLException {
    LobHandler lobHandler = new DefaultLobHandler();
    MockControl rsControl = MockControl.createControl(ResultSet.class);
    ResultSet rs = (ResultSet) rsControl.getMock();
    rs.getCharacterStream(1);
    rsControl.setReturnValue(null);
    rsControl.replay();
    lobHandler.getClobAsCharacterStream(rs, 1);
    rsControl.verify();
  }

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    // - lob creator should be closed
    // - set return value should be called
    // - execute update should be called
    
    MockControl lobHandlerControl = MockControl.createControl(LobHandler.class);
    LobHandler handler = (LobHandler)lobHandlerControl.getMock();    
    
    MockControl lobCreatorControl = MockControl.createControl(LobCreator.class);
    LobCreator creator = (LobCreator)lobCreatorControl.getMock();
    
    MockControl psControl = MockControl.createControl(PreparedStatement.class);
    PreparedStatement ps = (PreparedStatement)psControl.getMock();
    
    handler.getLobCreator();
    lobHandlerControl.setReturnValue(creator);
    ps.executeUpdate();
    psControl.setReturnValue(3);
    creator.close();

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              @Override
              public void processRow(ResultSet rs)
                  throws SQLException {
                if (!bFirstRowRead) {
                  LobHandler lobHandler = new DefaultLobHandler();
                  String clobText = lobHandler
                      .getClobAsString(rs, 1);
                  aCAS.setDocumentText(clobText);
                  bFirstRowRead = true;
                } else {
                  log.error("Multiple documents for document key: "

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    props.load(in);


    datasource = new DriverManagerDataSource(props.getProperty("db.url"), props.getProperty("db.username"), props.getProperty("db.password"));


    DataObjectFactory dataObjectFactory = new TgacDataObjectFactory();
    LobHandler lh = new DefaultLobHandler();
    JdbcTemplate template = new JdbcTemplate(datasource);


    //securityDAO = new SQLSecurityDAO();
    securityDAO = new MockSQLSecurityDAO();
    securityDAO.setLobHandler(lh);

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  @Rule
  public ExpectedException thrown = ExpectedException.none();


  @Test
  public void testCreatingPreparedStatementCallback() throws SQLException {
    LobHandler handler = mock(LobHandler.class);
    LobCreator creator = mock(LobCreator.class);
    PreparedStatement ps = mock(PreparedStatement.class);


    given(handler.getLobCreator()).willReturn(creator);
    given(ps.executeUpdate()).willReturn(3);


    class SetValuesCalled {
      boolean b = false;
    }

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    when(incrementerFactory.getIncrementer("ORACLE", tablePrefix + "JOB_EXECUTION_SEQ")).thenReturn(new StubIncrementer());
    when(incrementerFactory.getIncrementer("ORACLE", tablePrefix + "STEP_EXECUTION_SEQ")).thenReturn(new StubIncrementer());
    factory.setIncrementerFactory(incrementerFactory);


    factory.afterPropertiesSet();
    LobHandler lobHandler = (LobHandler) ReflectionTestUtils.getField(factory, "lobHandler");
    assertTrue(lobHandler instanceof OracleLobHandler);


  }

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