Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| JavaTM 2 Platform Std. Ed. v1.4.0
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## java.sql
Interface Clob

public interface Clob

The mapping in the JavaTM programming language for the SQL `CLOB` type. An SQL `CLOB` is a built-in type that stores a Character Large Object as a column value in a row of a database table. By default drivers implement a `Clob` object using an SQL `locator(CLOB)`, which means that a `Clob` object contains a logical pointer to the SQL `CLOB` data rather than the data itself. A `Clob` object is valid for the duration of the transaction in which it was created.

The `Clob` interface provides methods for getting the length of an SQL `CLOB` (Character Large Object) value, for materializing a `CLOB` value on the client, and for searching for a substring or `CLOB` object within a `CLOB` value. Methods in the interfaces `ResultSet`, `CallableStatement`, and `PreparedStatement`, such as `getClob` and `setClob` allow a programmer to access an SQL `CLOB` value. In addition, this interface has methods for updating a `CLOB` value.

Since:
  1.2

Method Summary
`InputStream` | `getAsciiStream()` Retrieves the `CLOB` value designated by this `Clob` object as an ascii stream.
`Reader` | `getCharacterStream()` Retrieves the `CLOB` value designated by this `Clob` object as a `java.io.Reader` object (or as a stream of characters).
`String` | `getSubString(long pos, int length)` Retrieves a copy of the specified substring in the `CLOB` value designated by this `Clob` object.
`long` | `length()` Retrieves the number of characters in the `CLOB` value designated by this `Clob` object.
`long` | `position(Clob searchstr, long start)` Retrieves the character position at which the specified `Clob` object `searchstr` appears in this `Clob` object.
`long` | `position(String searchstr, long start)` Retrieves the character position at which the specified substring `searchstr` appears in the SQL `CLOB` value represented by this `Clob` object.
`OutputStream` | `setAsciiStream(long pos)` Retrieves a stream to be used to write Ascii characters to the `CLOB` value that this `Clob` object represents, starting at position `pos`.
`Writer` | `setCharacterStream(long pos)` Retrieves a stream to be used to write a stream of Unicode characters to the `CLOB` value that this `Clob` object represents, at position `pos`.
`int` | `setString(long pos, String str)` Writes the given Java `String` to the `CLOB` value that this `Clob` object designates at the position `pos`.
`int` | `setString(long pos, String str, int offset, int len)` Writes `len` characters of `str`, starting at character `offset`, to the `CLOB` value that this `Clob` represents.
`void` | `truncate(long len)` Truncates the `CLOB` value that this `Clob` designates to have a length of `len` characters.

Method Detail

### length

    public long length()
                throws SQLException

  Retrieves the number of characters in the `CLOB` value designated by this `Clob` object.

  Returns:
    length of the `CLOB` in characters
  Throws:
    `SQLException` - if there is an error accessing the length of the `CLOB` value
  Since:
    1.2

### getSubString

    public String getSubString(long pos,
                               int length)
                        throws SQLException

  Retrieves a copy of the specified substring in the `CLOB` value designated by this `Clob` object. The substring begins at position `pos` and has up to `length` consecutive characters.

  Parameters:
    `pos` - the first character of the substring to be extracted. The first character is at position 1.
    `length` - the number of consecutive characters to be copied
  Returns:
    a `String` that is the specified substring in the `CLOB` value designated by this `Clob` object
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.2

### getCharacterStream

    public Reader getCharacterStream()
                              throws SQLException

  Retrieves the `CLOB` value designated by this `Clob` object as a `java.io.Reader` object (or as a stream of characters).

  Returns:
    a `java.io.Reader` object containing the `CLOB` data
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.2
See Also:
  `setCharacterStream(long)`

### getAsciiStream

    public InputStream getAsciiStream()
                               throws SQLException

  Retrieves the `CLOB` value designated by this `Clob` object as an ascii stream.

  Returns:
    a `java.io.InputStream` object containing the `CLOB` data
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.2
See Also:
  `setAsciiStream(long)`

### position

    public long position(String searchstr,
                         long start)
                  throws SQLException

  Retrieves the character position at which the specified substring `searchstr` appears in the SQL `CLOB` value represented by this `Clob` object. The search begins at position `start`.

  Parameters:
    `searchstr` - the substring for which to search
    `start` - the position at which to begin searching; the first position is 1
  Returns:
    the position at which the substring appears or -1 if it is not present; the first position is 1
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.2

### position

    public long position(Clob searchstr,
                         long start)
                  throws SQLException

  Retrieves the character position at which the specified `Clob` object `searchstr` appears in this `Clob` object. The search begins at position `start`.

  Parameters:
    `searchstr` - the `Clob` object for which to search
    `start` - the position at which to begin searching; the first position is 1
  Returns:
    the position at which the `Clob` object appears or -1 if it is not present; the first position is 1
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.2

### setString

    public int setString(long pos,
                         String str)
                  throws SQLException

  Writes the given Java `String` to the `CLOB` value that this `Clob` object designates at the position `pos`.

  Parameters:
    `pos` - the position at which to start writing to the `CLOB` value that this `Clob` object represents
    `str` - the string to be written to the `CLOB` value that this `Clob` designates
  Returns:
    the number of characters written
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.4

### setString

    public int setString(long pos,
                         String str,
                         int offset,
                         int len)
                  throws SQLException

  Writes `len` characters of `str`, starting at character `offset`, to the `CLOB` value that this `Clob` represents.

  Parameters:
    `pos` - the position at which to start writing to this `CLOB` object
    `str` - the string to be written to the `CLOB` value that this `Clob` object represents
    `offset` - the offset into `str` to start reading the characters to be written
    `len` - the number of characters to be written
  Returns:
    the number of characters written
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.4

### setAsciiStream

    public OutputStream setAsciiStream(long pos)
                                throws SQLException

  Retrieves a stream to be used to write Ascii characters to the `CLOB` value that this `Clob` object represents, starting at position `pos`.

  Parameters:
    `pos` - the position at which to start writing to this `CLOB` object
  Returns:
    the stream to which ASCII encoded characters can be written
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.4
See Also:
  `getAsciiStream()`

### setCharacterStream

    public Writer setCharacterStream(long pos)
                              throws SQLException

  Retrieves a stream to be used to write a stream of Unicode characters to the `CLOB` value that this `Clob` object represents, at position `pos`.

  Parameters:
    `pos` - the position at which to start writing to the `CLOB` value
  Returns:
    a stream to which Unicode encoded characters can be written
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.4
See Also:
  `getCharacterStream()`

### truncate

    public void truncate(long len)
                  throws SQLException

  Truncates the `CLOB` value that this `Clob` designates to have a length of `len` characters.

  Parameters:
    `len` - the length, in bytes, to which the `CLOB` value should be truncated
  Throws:
    `SQLException` - if there is an error accessing the `CLOB` value
  Since:
    1.4

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| JavaTM 2 Platform Std. Ed. v1.4.0
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Java, Java 2D, and JDBC are trademarks or registered trademarks of Sun Microsystems, Inc. in the US and other countries.
Copyright 1993-2002 Sun Microsystems, Inc. 901 San Antonio Road
Palo Alto, California, 94303, U.S.A. All Rights Reserved.