JDBC操控Oracle XMLDB

现在XML数据库大行其道，特别在数据交换领域，由于XML数据库本身的特点，可以大显身手，那么JDBC如何来操作XMLDB呢，我们举几个简单的例子抛砖引玉一下吧

 

 

• 在数据库中获取XMLType类型的列值，比如存储过程返回XmlType等，代码如下：

public static String getOracleXMlType2String(Object obj){
		try{
			if(obj instanceof OPAQUE){
				StringBuffer sb = new StringBuffer();
				OPAQUE op =(OPAQUE)obj; 
				if(op!=null){
					XMLType poxml = XMLType.createXML(op);
					if(poxml!=null){
						sb.append(poxml.getStringVal());
					}
				}
				return sb.toString();
			}
			return obj.toString();
		}catch(Exception ex){
			return null;
		}
	} 

执行存储过程代码：

 Object[] res = DbUtils.ExecuteSP("{call 存储过程名(?,?)}", new Object[]{
		new SpParameter(Types.VARCHAR, "IN", "in参数", "in参数值")
		,new SpParameter(OracleTypes.OPAQUE,"OUT","x",null)}, conn);

 

 

• 可以通过XmlType列的clob值，代码如下：

select x.sys_nc_rowinfo$.getclobval() as column_value	from xmltypeTable

 

• 执行存错过程（存储过程中含XmlTYPE返回值）

	public static final Object[] ExecuteSP(String stmt, Object[] inparams,
			Connection connection) {
		int i = 1;
		CallableStatement st = null;
		SpParameter sp = null;
		SpParameter outp = null;
		int DataType;
		String Direction;
		String Name;
		String DataValue;

		try {
			st = connection.prepareCall(stmt);

			int oupcount = 0;

			for (i = 0; i < inparams.length; i++) {
				if (inparams[i] instanceof SpParameter) {
					sp = (SpParameter) inparams[i];

					if (sp.GetDirection().toUpperCase().equals("IN")) {
						switch (sp.GetDataType()) {
						case Types.FLOAT:
						case Types.INTEGER:
							st
									.setLong(i + 1, Long.parseLong(sp
											.GetDataValue()));
							break;

						case Types.DATE:
							st.setDate(i + 1, java.sql.Date.valueOf(sp
									.GetDataValue()));
							break;
						case Types.SQLXML:
							st.setSQLXML(i + 1, null);
							break;
						default:
							st.setString(i + 1, sp.GetDataValue());
							break;
						}
					} else {
						if(sp.getDataType() == OracleTypes.OPAQUE){
							st.registerOutParameter (i+1, OracleTypes.OPAQUE,"SYS.XMLTYPE");
						}else
							st.registerOutParameter(i + 1, sp.GetDataType());
						oupcount = oupcount + 1;
					}
				} else
					st.setObject(i + 1, inparams[i]);
			}

			st.execute();
			i = 1;

			if (oupcount > 0) {
				Object[] outps = new Object[oupcount];
				int j = 0;
				for (i = 0; i < inparams.length; i++) {
					if (!(inparams[i] instanceof SpParameter))
						continue;

					sp = (SpParameter) inparams[i];

					if (!sp.GetDirection().toUpperCase().equals("IN")) {
						DataType = sp.GetDataType();
						Direction = sp.GetDirection();
						Name = sp.GetName();

						switch (DataType) {
						case Types.FLOAT:
							DataValue = String.valueOf(st.getLong(i + 1));
							break;

						case Types.INTEGER:
							DataValue = String.valueOf(st.getInt(i + 1));
							break;

						case Types.DATE:
							DataValue = st.getDate(i + 1).toString();
							break;

						case OracleTypes.OPAQUE:
							DataValue = getOracleXMlType2String(st.getObject(i+1));
							break;
						default:
							DataValue = st.getString(i + 1);
							break;
						}

						sp.setDataValue(DataValue);
						outps[j++] = DataValue;

						// res.addElement(new SpParameter(DataType, Direction,
						// Name,
						// DataValue));
					}
				}

				return outps;
			} else {
				return null;
			}
		} catch (SQLException ex) {
			
		} finally {
			if (st != null) {
				try {
					st.close();
				} catch (Exception ex) {
					log.error(ex);
				}

			}
		}
	}