sqloutputimpl.java

JAVA的一些源码 JAVA2 STANDARD EDITION DEVELOPMENT KIT 5.0

     *        values of a UDT to the database.
     */
    public void writeTimestamp(java.sql.Timestamp x) throws SQLException {
        attribs.add(x);
    }

    /**
     * Writes a stream of Unicode characters to this
     * <code>SQLOutputImpl</code> object. The driver will do any necessary
     * conversion from Unicode to the database <code>CHAR</code> format.
     *
     * @param x the value to pass to the database           
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeCharacterStream(java.io.Reader x) throws SQLException {
         BufferedReader bufReader = new BufferedReader(x);
         try {
             int i;
             while( (i = bufReader.read()) != -1 ) {
                char ch = (char)i;
		StringBuffer strBuf = new StringBuffer();
		strBuf.append(ch);
		
		String str = new String(strBuf);                
                String strLine = bufReader.readLine();
                
                writeString(str.concat(strLine));
             }   
         } catch(IOException ioe) {
         
         }
    }

    /**
     * Writes a stream of ASCII characters to this
     * <code>SQLOutputImpl</code> object. The driver will do any necessary
     * conversion from ASCII to the database <code>CHAR</code> format.
     *
     * @param x the value to pass to the database
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeAsciiStream(java.io.InputStream x) throws SQLException {
         BufferedReader bufReader = new BufferedReader(new InputStreamReader(x));
         try {
               int i;
               while( (i=bufReader.read()) != -1 ) {
                char ch = (char)i;
               
		StringBuffer strBuf = new StringBuffer();
		strBuf.append(ch);
		
		String str = new String(strBuf);                
                String strLine = bufReader.readLine();
                
                writeString(str.concat(strLine));
            }
          }catch(IOException ioe) {
            throw new SQLException(ioe.getMessage());
        }
    }

    /**
     * Writes a stream of uninterpreted bytes to this <code>SQLOutputImpl</code>
     * object.
     *
     * @param x the value to pass to the database
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeBinaryStream(java.io.InputStream x) throws SQLException {
         BufferedReader bufReader = new BufferedReader(new InputStreamReader(x));
         try {
               int i;
             while( (i=bufReader.read()) != -1 ) {
                char ch = (char)i;
               
		StringBuffer strBuf = new StringBuffer();
		strBuf.append(ch);
		
		String str = new String(strBuf);                
                String strLine = bufReader.readLine();
                
                writeString(str.concat(strLine));
             }
        } catch(IOException ioe) {
            throw new SQLException(ioe.getMessage());
        }
    }
    
    //================================================================
    // Methods for writing items of SQL user-defined types to the stream.
    // These methods pass objects to the database as values of SQL
    // Structured Types, Distinct Types, Constructed Types, and Locator
    // Types.  They decompose the Java object(s) and write leaf data
    // items using the methods above.
    //================================================================

    /**
     * Writes to the stream the data contained in the given 
     * <code>SQLData</code> object.
     * When the <code>SQLData</code> object is <code>null</code>, this
     * method writes an SQL <code>NULL</code> to the stream.  
     * Otherwise, it calls the <code>SQLData.writeSQL</code>
     * method of the given object, which 
     * writes the object's attributes to the stream.
     * <P>
     * The implementation of the method <code>SQLData.writeSQ</code>
     * calls the appropriate <code>SQLOutputImpl.writeXXX</code> method(s)
     * for writing each of the object's attributes in order.
     * The attributes must be read from an <code>SQLInput</code>
     * input stream and written to an <code>SQLOutputImpl</code>
     * output stream in the same order in which they were
     * listed in the SQL definition of the user-defined type.
     * 
     * @param x the object representing data of an SQL structured or
     *          distinct type
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeObject(SQLData x) throws SQLException {
        
        /*
         * Except for the types that are passed as objects
         * this seems to be the only way for an object to
         * get a null value for a field in a structure.
         *
         * Note: this means that the class defining SQLData 
         * will need to track if a field is SQL null for itself
         */
        if (x == null) {
            attribs.add(x);
            return;
        }
        
        /* 
         * We have to write out a SerialStruct that contains
         * the name of this class otherwise we don't know
         * what to re-instantiate during readSQL()
         */
        attribs.add(new SerialStruct((SQLData)x, map));
    }

    /**
     * Writes a <code>Ref</code> object in the Java programming language
     * to this <code>SQLOutputImpl</code> object.  The driver converts
     * it to a serializable <code>SerialRef</code> SQL <code>REF</code> value 
     * before returning it to the database.
     *
     * @param x an object representing an SQL <code>REF</code> value
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeRef(Ref x) throws SQLException {
        if (x == null) {
            attribs.add(x);
            return;
        }
        attribs.add(new SerialRef(x));
    }

    /**
     * Writes a <code>Blob</code> object in the Java programming language
     * to this <code>SQLOutputImpl</code> object.  The driver converts
     * it to a serializable <code>SerialBlob</code> SQL <code>BLOB</code> value 
     * before returning it to the database.
     *
     * @param x an object representing an SQL <code>BLOB</code> value
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeBlob(Blob x) throws SQLException {
        if (x == null) {
            attribs.add(x);
            return;
        }
        attribs.add(new SerialBlob(x));
    }
    
    /**
     * Writes a <code>Clob</code> object in the Java programming language
     * to this <code>SQLOutputImpl</code> object.  The driver converts
     * it to a serializable <code>SerialClob</code> SQL <code>CLOB</code> value 
     * before returning it to the database.
     *
     * @param x an object representing an SQL <code>CLOB</code> value
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeClob(Clob x) throws SQLException {
        if (x == null) {
            attribs.add(x);
            return;
        }
        attribs.add(new SerialClob(x));
    }

    /**
     * Writes a <code>Struct</code> object in the Java
     * programming language to this <code>SQLOutputImpl</code>
     * object. The driver converts this value to an SQL structured type
     * before returning it to the database.
     * <P>
     * This method should be used when an SQL structured type has been
     * mapped to a <code>Struct</code> object in the Java programming
     * language (the standard mapping).  The method 
     * <code>writeObject</code> should be used if an SQL structured type
     * has been custom mapped to a class in the Java programming language.
     *
     * @param x an object representing the attributes of an SQL structured type          
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeStruct(Struct x) throws SQLException {
        SerialStruct s = new SerialStruct(x,map);;
        attribs.add(s);        
    }
    
    /**
     * Writes an <code>Array</code> object in the Java
     * programming language to this <code>SQLOutputImpl</code>
     * object. The driver converts this value to a serializable 
     * <code>SerialArray</code> SQL <code>ARRAY</code>
     * value before returning it to the database.
     *
     * @param x an object representing an SQL <code>ARRAY</code> value
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeArray(Array x) throws SQLException {
        if (x == null) {
            attribs.add(x);
            return;
        }
        attribs.add(new SerialArray(x, map));
    }

    /**
     * Writes an <code>java.sql.Type.DATALINK</code> object in the Java 
     * programming language to this <code>SQLOutputImpl</code> object. The
     * driver converts this value to a serializable <code>SerialDatalink</code>
     * SQL <code>DATALINK</code> value before return it to the database.
     *     
     * @param url an object representing a SQL <code>DATALINK</code> value
     * @throws SQLException if the <code>SQLOutputImpl</code> object is in
     *        use by a <code>SQLData</code> object attempting to write the attribute
     *        values of a UDT to the database.
     */
    public void writeURL(java.net.URL url) throws SQLException {
        if (url == null) {
            attribs.add(url);
            return;
        }
        attribs.add(new SerialDatalink(url));
        
    }
}