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java.sql
Interface Clob
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All Known Subinterfaces:
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NClob
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All Known Implementing Classes:
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SerialClob
-
public interface Clob
The mapping in the Java
TM
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.
All methods on the Clob interface must be fully implemented if the JDBC driver supports the data type.
-
Since:
-
1.2
Method Summary
|
void |
free
()
This method frees the Clob object and releases the resources the resources that it holds. |
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). |
Reader
|
getCharacterStream
(long pos, long length)
Returns a Reader object that contains a partial Clob value, starting with the character specified by pos, which is length characters in length. |
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. |
length
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
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.2
getSubString
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; the value for length must be 0 or greater
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; if pos is less than 1 or length is less than 0
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
- if there is an error accessing the CLOB value
-
Since:
-
1.2
getCharacterStream
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
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.2
-
See Also:
-
setCharacterStream(long)
getAsciiStream
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
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Throws:
-
SQLException
- if there is an error accessing the CLOB value
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.2
-
See Also:
-
setAsciiStream(long)
position
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
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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
or if pos is less than 1
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.2
position
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
or if start is less than 1
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.2
setString
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.
The string will overwrite the existing characters in the Clob object starting at the position pos. If the end of the Clob value is reached while writing the given string, then the length of the Clob value will be increased to accomodate the extra characters.
Note:
If the value specified for pos is greater then the length+1 of the CLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.
-
-
Parameters:
-
pos - the position at which to start writing to the CLOB value that this Clob object
represents; The first position is 1
represents
-
str - the string to be written to the CLOB value that this Clob designates
-
Returns:
-
the number of characters written
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Throws:
-
SQLException
- if there is an error accessing the CLOB value
or if pos is less than 1
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.4
setString
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.
The string will overwrite the existing characters in the Clob object starting at the position pos. If the end of the Clob value is reached while writing the given string, then the length of the Clob value will be increased to accomodate the extra characters.
Note:
If the value specified for pos is greater then the length+1 of the CLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.
-
-
Parameters:
-
pos - the position at which to start writing to this CLOB
object; The first position is 1
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
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Returns:
-
the number of characters written
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Throws:
-
SQLException
- if there is an error accessing the CLOB value
or if pos is less than 1
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.4
setAsciiStream
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.
Characters written to the stream will overwrite the existing characters in the Clob object starting at the position pos. If the end of the Clob value is reached while writing characters to the stream, then the length of the Clob value will be increased to accomodate the extra characters.
Note:
If the value specified for pos is greater then the length+1 of the CLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.
-
-
Parameters:
-
pos - the position at which to start writing to this CLOB
object; The first position is 1
object
-
Returns:
-
the stream to which ASCII encoded characters can be written
-
Throws:
-
SQLException
- if there is an error accessing the CLOB value
or if pos is less than 1
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.4
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See Also:
-
getAsciiStream()
setCharacterStream
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.
Characters written to the stream will overwrite the existing characters in the Clob object starting at the position pos. If the end of the Clob value is reached while writing characters to the stream, then the length of the Clob value will be increased to accomodate the extra characters.
Note:
If the value specified for pos is greater then the length+1 of the CLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.
-
-
Parameters:
-
pos - the position at which to start writing to the CLOB
value; The first position is 1
value
-
Returns:
-
a stream to which Unicode encoded characters can be written
-
Throws:
-
SQLException
- if there is an error accessing the CLOB value
or if pos is less than 1
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.4
-
See Also:
-
getCharacterStream()
truncate
void truncate(long len)
throws SQLException
-
Truncates the CLOB value that this Clob designates to have a length of len characters.
Note:
If the value specified for pos is greater then the length+1 of the CLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.
-
-
Parameters:
-
len - the length, in
characters,
bytes,
to which the CLOB value should be truncated -
Throws:
-
SQLException
- if there is an error accessing the CLOB value
or if len is less than 0
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.4
free
void free()
throws SQLException
-
This method frees the Clob object and releases the resources the resources that it holds. The object is invalid once the free method is called.
After free has been called, any attempt to invoke a method other than free will result in a SQLException being thrown.
If free is called multiple times, the subsequent calls to free are treated as a no-op.
-
-
Throws:
-
SQLException
- if an error occurs releasing the Clob's resources
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.6
getCharacterStream
Reader getCharacterStream(long pos,
long length)
throws SQLException
-
Returns a Reader object that contains a partial Clob value, starting with the character specified by pos, which is length characters in length.
-
-
Parameters:
-
pos - the offset to the first character of the partial value to be retrieved. The first character in the Clob is at position 1.
-
length - the length in characters of the partial value to be retrieved.
-
Returns:
-
Reader through which the partial Clob value can be read.
-
Throws:
-
SQLException
- if pos is less than 1 or if pos is greater than the number of characters in the Clob or if pos + length is greater than the number of characters in the Clob
-
SQLFeatureNotSupportedException
- if the JDBC driver does not support this method
-
Since:
-
1.6