下载ODBC Jar包驱动,网上百度下载或者去官网下载，导入到Eclipse 项目里面
建立连接
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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("------加载驱动成功-----"); conn = (Connection) DriverManager.getConnection(url, user, password); Log.logD("------连接成功-----"); } catch (ClassNotFoundException e) { Log.logD("------加载驱动失败，驱动类未找到------"); e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); Log.logD("------加载驱动失败------"); } } public static Connection getConn(){ return conn; }} |
查询
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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; } /* * 将查询结果转化为json数组 需要导入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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//调用String sql="select * from table";String result=DbGetGps.select(sql);System.out.println(result); |
以上所述是小编给大家介绍的Java连接Oracle数据库并查询，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://www.2cto.com/database/201704/634183.html
