select gid, username from users where FIND_IN_SET(8,gid); //查询gid里含有数字8的记录,gid是varchar ,数据格式:"1,12,8,18,5" select gid, username from users where !FIND_IN_SET(8,gid); //查询gid里不含有数字8的记录,gid是varchar ,数据格式:"1,12,8,18,5"
How to export an instantiation of a Standard Template Library (STL) class and a class that contains a data member that is an STL object Summary This article discusses how to perform the following tasks: Export an instantiation of a Standard Templat
(转自)https://www.cnblogs.com/robbinluobo/p/7217387.html String.JsonObject.JavaBean 互相转换 User user = new Gson().fromJson(jsonObject, User.class); User user = new Gson().fromJson(string, User.class); String string = new Gson().toJson(user); JsonObject j
转换时Bean所要求的: 被转换的Bean必需是public的. Bean被转换的属性一定要有对应的get方法,且一定要是public的. Bean中不能用引用自身的this的属性,否则运行时出现et.sf.json.JSONException: There is a cycle in the hierarchy!异常 json-lib包转换时,不能以null为键名,否则运行报net.sf.json.JSONException:java.lang.NullPointerException:JSO