import java.sq.*;    Connection conn = null;  Statement stmt;  ResultSet rs;       String sql = "select * from tab " ; 
 //con = DriverManager.getConnection("jdbc:poolman://tgpms-help");
   //连接Oracle数据库  Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();  conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.15.248:1521:ycdb","webcfcquery","kill859");   //连接Mysql数据库  Class.forName("org.gjt.mm.mysql.Driver").newInstance();  conn = DriverManager.getConnection("jdbc:mysql://localhost/meeting","root","21century");       stmt = con.createStatement();  rs = stmt.executeQuery(sql);      rs.close();  stmt.close();  con.close();   
 
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