String []  name=new String[]{"張三","李四","123","321"};
		StringBuilder buffer=new StringBuilder("select * from user ");
		boolean needOr=false;
		for (String string : name) {
			if(needOr){
				buffer.append(" or ");
			}
				  buffer.append("username = '");  
		          buffer.append(string);  
		          buffer.append("'");  
		          needOr = true;  
			}
		
		System.out.println(buffer.toString());
		
		}