Java连接Oracle数据库并查询

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

public class DbConn {
  private static String driver = "oracle.jdbc.driver.OracleDriver";
  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

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;
  }
  
  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();
  }
}

//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考高分网网站的支持！