下載ODBC Jar包驅動,網上百度下載或者去官網下載，導入到Eclipse 項目里面
建立連接
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public class DbConn { private static String url = "jdbc:oracle:thin:@localhost:1521:orcl"; private static String user = "root"; private static String password = "root"; private static Connection conn = null; static { try { Class.forName(driver); Log.logD("------加載驅動成功-----"); conn = (Connection) DriverManager.getConnection(url, user, password); Log.logD("------連接成功-----"); } catch (ClassNotFoundException e) { Log.logD("------加載驅動失敗，驅動類未找到------"); e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); Log.logD("------加載驅動失敗------"); } } public static Connection getConn(){ return conn; }} |
查詢
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public class DbGetCan { private static PreparedStatement pstmt; private static ResultSet rs; private static Connection conn; public static String select(String sql) { conn=DbConn.getConn(); try { pstmt = conn.prepareStatement(sql); rs = pstmt.executeQuery(); return getJsonArray(); } catch (SQLException e) { e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /* * 將查詢結果轉化為json數組 需要導入Json jar包 */ public static String getJsonArray() throws SQLException, JSONException { JSONArray jsonArray=new JSONArray(); ResultSetMetaData metaData = (ResultSetMetaData) rs.getMetaData(); int columnCount = metaData.getColumnCount(); while (rs.next()) { JSONObject jsonData = new JSONObject(); for (int i = 1; i <= columnCount; i++) { String columnName = metaData.getColumnLabel(i); String value = rs.getString(columnName); jsonData.put(columnName, value); } jsonArray.put(jsonData); } rs.close(); pstmt.close(); return jsonArray.toString(); }} |
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//調用String sql="select * from table";String result=DbGetGps.select(sql);System.out.println(result); |
以上所述是小編給大家介紹的Java連接Oracle數據庫并查詢，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
原文鏈接：http://www.2cto.com/database/201704/634183.html
