集群聊天服务器：数据库表的设计

MySQL的安装

本项目是在ubuntu下，需要安装mysql-server和mysql开发包，包括mysql头文件和动态库文件，命令如下：

sudo apt-get install mysql-server =》 安装最新版MySQL服务器
sudo apt-get install libmysqlclient-dev =》 安装开发包

修改表的字符编码：alter table user default character set utf8;
修改属性的字符编码：alter table user modify column name varchar(50) character set utf8;

表的设计

表的设计 脚本

-- MySQL dump 10.13  Distrib 5.7.31, for Linux (x86_64)
--
-- Host: localhost    Database: chat
-- ------------------------------------------------------
-- Server version	5.7.31

/*!40101 SET @[email protected]@CHARACTER_SET_CLIENT */;
/*!40101 SET @[email protected]@CHARACTER_SET_RESULTS */;
/*!40101 SET @[email protected]@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @[email protected]@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @[email protected]@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @[email protected]@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @[email protected]@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @[email protected]@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `allgroup`
--

DROP TABLE IF EXISTS `allgroup`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `allgroup` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `groupname` varchar(50) CHARACTER SET utf8 NOT NULL,
  `groupdesc` varchar(200) CHARACTER SET utf8 DEFAULT '',
  PRIMARY KEY (`id`),
  UNIQUE KEY `groupname` (`groupname`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `allgroup`
--

LOCK TABLES `allgroup` WRITE;
/*!40000 ALTER TABLE `allgroup` DISABLE KEYS */;
INSERT INTO `allgroup` VALUES (1,'C++ chat project','start develop a chat project');
/*!40000 ALTER TABLE `allgroup` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `friend`
--

DROP TABLE IF EXISTS `friend`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `friend` (
  `userid` int(11) NOT NULL,
  `friendid` int(11) NOT NULL,
  KEY `userid` (`userid`,`friendid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `friend`
--

LOCK TABLES `friend` WRITE;
/*!40000 ALTER TABLE `friend` DISABLE KEYS */;
INSERT INTO `friend` VALUES (13,15),(13,21),(21,13),(21,15);
/*!40000 ALTER TABLE `friend` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `groupuser`
--

DROP TABLE IF EXISTS `groupuser`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `groupuser` (
  `groupid` int(11) NOT NULL,
  `userid` int(11) NOT NULL,
  `grouprole` enum('creator','normal') CHARACTER SET utf8 DEFAULT NULL,
  KEY `groupid` (`groupid`,`userid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `groupuser`
--

LOCK TABLES `groupuser` WRITE;
/*!40000 ALTER TABLE `groupuser` DISABLE KEYS */;
INSERT INTO `groupuser` VALUES (1,13,'creator'),(1,21,'normal'),(1,19,'normal');
/*!40000 ALTER TABLE `groupuser` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `offlinemessage`
--

DROP TABLE IF EXISTS `offlinemessage`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `offlinemessage` (
  `userid` int(11) NOT NULL,
  `message` varchar(500) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `offlinemessage`
--

LOCK TABLES `offlinemessage` WRITE;
/*!40000 ALTER TABLE `offlinemessage` DISABLE KEYS */;
INSERT INTO `offlinemessage` VALUES (19,'{
    \"groupid\":1,\"id\":21,\"msg\":\"hello\",\"msgid\":10,\"name\":\"gao yang\",\"time\":\"2020-02-22 00:43:59\"}'),(19,'{
    \"groupid\":1,\"id\":21,\"msg\":\"helo!!!\",\"msgid\":10,\"name\":\"gao yang\",\"time\":\"2020-02-22 22:43:21\"}'),(19,'{
    \"groupid\":1,\"id\":13,\"msg\":\"hahahahaha\",\"msgid\":10,\"name\":\"zhang san\",\"time\":\"2020-02-22 22:59:56\"}'),(19,'{
    \"groupid\":1,\"id\":13,\"msg\":\"hahahahaha\",\"msgid\":10,\"name\":\"zhang san\",\"time\":\"2020-02-23 17:59:26\"}'),(19,'{
    \"groupid\":1,\"id\":21,\"msg\":\"wowowowowow\",\"msgid\":10,\"name\":\"gao yang\",\"time\":\"2020-02-23 17:59:34\"}');
/*!40000 ALTER TABLE `offlinemessage` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `user`
--

DROP TABLE IF EXISTS `user`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) DEFAULT NULL,
  `password` varchar(50) DEFAULT NULL,
  `state` enum('online','offline') CHARACTER SET utf8 DEFAULT 'offline',
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `user`
--

LOCK TABLES `user` WRITE;
/*!40000 ALTER TABLE `user` DISABLE KEYS */;
INSERT INTO `user` VALUES (13,'zhang san','123456','online'),(15,'li si','666666','offline'),(16,'liu shuo','123456','offline'),(18,'wu yang','123456','offline'),(19,'pi pi','123456','offline'),(21,'gao yang','123456','offline');
/*!40000 ALTER TABLE `user` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET [email protected]_TIME_ZONE */;

/*!40101 SET [email protected]_SQL_MODE */;
/*!40014 SET [email protected]_FOREIGN_KEY_CHECKS */;
/*!40014 SET [email protected]_UNIQUE_CHECKS */;
/*!40101 SET [email protected]_CHARACTER_SET_CLIENT */;
/*!40101 SET [email protected]_CHARACTER_SET_RESULTS */;
/*!40101 SET [email protected]_COLLATION_CONNECTION */;
/*!40111 SET [email protected]_SQL_NOTES */;