public ResultSet executeQuery(String sql){

ResultSet result=null;

ResultSet rs=null;

PreparedStatement pst=null;

try {

pst=con.prepareStatement(sql);

if(sqlValues!=null&&sqlValues.size()>0){  //当sql语句中存在占位符时

setSqlValues(pst,sqlValues);

}

rs=pst.executeQuery(sql);

result=(ResultSet) ResultSupport.toResult(rs);  //一定要在关闭数据库之前完成转换

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

this.closeAll(con, pst, rs);

}

return result;

}

这是我调用的

public static int getworkeramount(){

DBHelper dh=new DBHelper();

int x=0;

String sql=new String("select count(perno) from per");

ResultSet rs=dh.executeQuery(sql);

try{

rs.next();

x=rs.getInt(1);

}

catch(Exception ex){

}

return x;

}

出现了这样的错误

com.microsoft.sqlserver.jdbc.SQLServerException: 对于 PreparedStatement 或      CallableStatement，方法 executeQuery() 不能带有参数。

at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeQuery(SQLServerPreparedStatement.java:1578)

at base.DBHelper.executeQuery(DBHelper.java:142)

at frm.Mainfrm.getworkeramount(Mainfrm.java:590)

at frm.Mainfrm.(Mainfrm.java:18)

at frm.Mainfrm.main(Mainfrm.java:666)

求大神请教