技術標籤：Oracle資料庫jAVA工具資料庫java

/**
	 * oracle資料庫型別轉換之 ClobToString
	 * 
	 * @param clob
	 * @return String
	 */
	public static String ClobToString(CLOB clob) {

		String reString = "";
		try {
			BufferedReader br = new BufferedReader(clob.getCharacterStream());
			
			String s = br.readLine
 
();
			StringBuffer sb = new StringBuffer();
			while (s != null) {// 執行迴圈將字串全部取出付值給StringBuffer由StringBuffer轉成STRING
				// sb.append("\r\n");
				sb.append(System.getProperty("line.separator"));
				sb.append(s);
				s = br.readLine();
			}
			reString = sb.toString();
		} catch (SQLException
 
 | IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} // 得到流

		return reString;
	}


/**
	 * 得到總和的數量
	 * @param sqlNeedDeal sql 是否需要處理
	 * @param sql
	 * @param params
	 * @return
	 */
	public int getCount(boolean sqlNeedDeal,String sql, Object... params) {
		int result = 0
 
;
		if(sqlNeedDeal){
			sql = "select count(0) from ("+sql+")";
		}
		
		try (Connection connection = ds.getConnection()) {
			try (PreparedStatement pp = connection.prepareStatement(sql)) {
				for (int i = 0; i < params.length; i++) {
					pp.setObject(i + 1, params[i]);
				}
				try (ResultSet rs = pp.executeQuery()) {
					while (rs.next()) {
						result = rs.getInt(1);
					}
				} catch (Exception e) {
					System.err.println("getCount:資料庫獲取失敗！");
					e.printStackTrace();
				}
			} catch (SQLException e) {
				System.err.println("getCount:資料庫準備失敗！");
				e.printStackTrace();
			}
		} catch (SQLException e) {
			System.err.println("getCount:資料庫獲取失敗！");
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 更新資料
	 * @param sql
	 * @param params
	 * @return
	 */
	public int executeUpdate(String sql, Object... params) throws SQLException{
		int result = -1;
		try (Connection connection = ds.getConnection()) {
			try (PreparedStatement pp = connection.prepareStatement(sql)) {
				for (int i = 0; i < params.length; i++) {
					pp.setObject(i + 1, params[i]);
				}
				result = pp.executeUpdate();
			} catch (SQLException e) {
				System.err.println("executeUpdate:資料庫準備或者更新失敗！");
				e.printStackTrace();
				throw(e);
			}
		} catch (SQLException e) {
			System.err.println("executeUpdate:資料庫獲取失敗！");
			e.printStackTrace();
			throw(e);
		}
		return result;
	}
	
	//public Map<String,Object> execute
	/**
	 * 得到查詢資料 ，該方法暫時只支援比較普通的查詢
	 * @param sql
	 * @param columns
	 * @param params
	 * @return
	 */
	public List<LinkedHashMap<String, Object>>   executeSelect(String sql,List<String> columns, Object... params){
		List<LinkedHashMap<String, Object>> datas=new ArrayList<>();
		try (Connection connection = ds.getConnection()) {
			try (PreparedStatement pp = connection.prepareStatement(sql)) {
				for (int i = 0; i < params.length; i++) {
					pp.setObject(i + 1, params[i]);
				}
				try (ResultSet rs = pp.executeQuery()) {
					while (rs.next()) {
						LinkedHashMap<String, Object> one = new LinkedHashMap<>();
						for (String key : columns) {
							one.put(key,rs.getObject(key));
						}
						if(one.size()>0){
							datas.add(one);
						}
					}
				} catch (Exception e) {
					System.err.println("executeSelect:資料庫獲取失敗！");
					e.printStackTrace();
				}
			} catch (SQLException e) {
				System.err.println("executeSelect:資料庫準備失敗！");
				e.printStackTrace();
			}
		} catch (SQLException e) {
			System.err.println("executeSelect:資料庫獲取失敗！");
			e.printStackTrace();
		}
		return datas;
	}
	/**
	 * 得到查詢資料 ，該方法暫時只支援比較普通的查詢
	 * @param sql
	 * @param columns Map<String, String>   第一個表示的name 第二個是資料庫的name
	 * @param params  
	 * @return
	 */
	public List<LinkedHashMap<String, Object>>   executeSelect(String sql,Map<String, String> columns, Object... params){
		List<LinkedHashMap<String, Object>> datas=new ArrayList<>();
		try (Connection connection = ds.getConnection()) {
			try (PreparedStatement pp = connection.prepareStatement(sql)) {
				for (int i = 0; i < params.length; i++) {
					pp.setObject(i + 1, params[i]);
				}
				try (ResultSet rs = pp.executeQuery()) {
					while (rs.next()) {
						LinkedHashMap<String, Object> one = new LinkedHashMap<>();
						for (Map.Entry<String,String> key : columns.entrySet()) {
							Object value = rs.getObject(key.getValue());
							one.put(key.getKey(),value==null?" ":value);
						}
						if(one.size()>0){
							datas.add(one);
						}
					}
				} catch (Exception e) {
					System.err.println("executeSelect:資料庫獲取失敗！");
					e.printStackTrace();
				}
			} catch (SQLException e) {
				System.err.println("executeSelect:資料庫準備失敗！");
				e.printStackTrace();
			}
		} catch (SQLException e) {
			System.err.println("executeSelect:資料庫獲取失敗！");
			e.printStackTrace();
		}
		return datas;
	}
	

ArrayList<Object> params = new ArrayList<Object>();
/*params新增入sql中的條件值。如：
if(time_title !=null && (time_s != null && time_e != null)){
			where += " and s." + time_title + ">=to_date(?,'yyyy-mm-dd')";
			params.add(time_s.trim());
			where += " and s." + time_title + "<(to_date(?,'yyyy-mm-dd')+1)";
			params.add(time_e.trim());
			
		}
*/
List<LinkedHashMap<String, Object>> datas=new ArrayList<>();
LinkedHashMap<String, String> columns = new LinkedHashMap<String, String>();
			
			columns.put("型別", "z_type");
			columns.put("狀態", "status");
			
			datas = helper.executeSelect(sql, columns, params.toArray());
String	jsonString=JSON.toJSONString(datas);