static String buildInsertSql(String table, String[] fields) {
		StringBuilder stringBuilder = new StringBuilder();
       //	stringBuilder.append("INSERT INTO " + table + " (" + fields[0] + ", " + fields[1] + ", " + fields[2] + ") VALUES (?, ?, ?)");

	    stringBuilder.append("INSERT INTO " + table + " (");
	    for (int i = 0; i < fields.length; i++) {
	        stringBuilder.append(fields[i]);
            //如果不是最后一个字符串，就在连接后再连接一个“，”
	        if (i < fields.length - 1) {
	            stringBuilder.append(", ");
	        }
	    }
	    stringBuilder.append(") VALUES (?, ?, ?)");
	    return stringBuilder.toString();
	}

}