SQLite实现在线电子词典

需求：

服务器：

1）.提供英英方式的单词查询

2）.同时记录用户的查询历史

2）.客户机登陆需要密码

客户机：

1）.登陆需要密码，并且提供注册新用户功能，注意在用户输入密码的时候不能显示密码，就像linux登陆时的那样

2）.用户的查询即时给予回复

3）.用户可以查询自己的查询历史

4）.用户也可以清除自己的历史记录

下面是源码，由于时间仓促，代码难免比较粗糙，希望谅解！

server.h:

/*************************************************************************> File Name: server.h> Author: Baniel Gao> Mail: createchance@163.com > Created Time: Wed 15 Jan 2014 09:39:40 AM CST************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <sqlite3.h>
#include <errno.h>
#include <error.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <signal.h>#define BUFF_SIZE      32
/*The len of sql*/
#define SQL_LEN         512/*The max len of username*/
#define MAX_USERNAME    256
/*The max len of word and password*/
#define MAX_WORD        128
/*The max len of explaintion to word*/
#define EXP_LEN         1024/*The flag of status*   R for register* L for login*    Q for quary*    H for history*  S for client stop*  C for clear history* */
#define R               1
#define L               2
#define Q               3
#define H               4
#define S               5
#define C               6/*flags to show user status*/
#define ON_LINE         1
#define OFF_LINE        0/*network infomation*/
#define SERVER_IP       "0.0.0.0"
#define SERVER_PORT     50000/*text dictionary path*/
#define DIC_PATH        "./dict/dic.txt"/*system and user log path */
#define SYS_LOG         "./log/sys.log"
#define USER_LOG        "./log/user.log"/*flags to set term display mode*/
#define ECHOFLAGS (ECHO | ECHOE | ECHOK | ECHONL)/*error handler function*/
#define error_exit(_errmsg_)    error(EXIT_FAILURE, errno, _errmsg_)/*client message struct*/
typedef struct _client_msg_ {char type;char name[MAX_USERNAME];char data[MAX_WORD];
} climsg_st;/*server message struct*/
typedef struct _server_msg_ {char type;char text[EXP_LEN];
} sermsg_st;/*functions to deal user quary*/
void menu(void);
void login_reg(void);
int show_history(sqlite3 *db, int connfd);
int clear_history(sqlite3 *db, int connfd);
int login(sqlite3 *db, int connfd);
int logout(sqlite3 *db, int connfd);
int regist(sqlite3 *db, int connfd);
int set_disp_mode(int fd,int option);
int quary(sqlite3 *db, int connfd);

server.c:

/*************************************************************************> File Name: server.c> Author: Baniel Gao> Mail: createchance@163.com > Blog: blog.csdn.net/createchance > Created Time: Wed 15 Jan 2014 11:52:12 AM CST************************************************************************/
#include "server.h"/*client and server message struct*/
climsg_st climsg;
sermsg_st sermsg;int main(void)
{FILE *dictfp, *sysfp, *userfp;int sockfd, connfd;int ret;int lines = 0, alllines = 19661;pid_t pid;struct sockaddr_in server_addr, client_addr;socklen_t addrlen;sqlite3 *db;char explain[EXP_LEN];char *token;char sql[SQL_LEN];char *errmsg;/*open local database my.db*/if (0 != sqlite3_open("my.db", &db)) {printf("error: %s \n", sqlite3_errmsg(db));return -1;}
/*open local text dictionary for read*/if (NULL == (dictfp = fopen(DIC_PATH, "r")))error_exit("fopen");
/*open system log for append*/if (NULL == (sysfp = fopen(SYS_LOG, "a")))error_exit("fopen");
/*open user log for append*/if (NULL == (userfp = fopen(USER_LOG, "a")))error_exit("fopen");/*import the dictionary from local text dictionary*/while (1) {system("clear");printf("Importing data...\n");if (NULL == fgets(explain, EXP_LEN, dictfp))break;printf("\e[32m%.1f%% done!\e[0m \n", (lines++) * 100.0 / alllines);token = strtok(explain, " ");sprintf(sql, "insert into dictionary values(\"%s\", \"%s\");", token, explain + 17);if (0 != (ret = sqlite3_exec(db, sql, NULL, NULL, &errmsg))) {if (19 != ret) {printf("error: %s \n", errmsg);return -1;}}}printf("Import done! \n");/*create and open a socket for accept client connect*/if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))error_exit("socket");server_addr.sin_family = AF_INET;server_addr.sin_port = htons(SERVER_PORT);server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);addrlen = sizeof(server_addr);
/*server needs to bind the opening socket to local address*/if (-1 == bind(sockfd, (const struct sockaddr *)&server_addr, addrlen))error_exit("bind");
/*server listen on the socket*/if (-1 == listen(sockfd, 10))error_exit("listen");
/* make server to ingore the child process exit signal(SIGCHLD),* this can help to avoid zombie process* */signal(SIGCHLD, SIG_IGN);while (1) {
/*when there is a connection has come, accept to deal it*/if (-1 == (connfd = accept(sockfd, (struct sockaddr *)&client_addr, &addrlen)))error_exit("accept");
/*create child process to handler client quary*/if (-1 == (pid = fork()))error_exit("fork");if (pid == 0) {while (1) {if (-1 == recv(connfd, &climsg, sizeof(climsg), 0))error_exit("recv");if (S == climsg.type) {logout(db, connfd);exit(0);}else if (L == climsg.type)login(db, connfd);else if (R == climsg.type)regist(db, connfd);else if (Q == climsg.type)quary(db, connfd);else if (H == climsg.type)show_history(db, connfd);else if (C == climsg.type)clear_history(db, connfd);}} else {close(connfd);}}return 0;
}int regist(sqlite3 *db, int connfd)
{char regist[SQL_LEN];char *errmsg;sprintf(regist, "insert into userstat values('%s', '%s');", climsg.name, climsg.data);if (SQLITE_OK != sqlite3_exec(db, regist, NULL, NULL, &errmsg)) {sermsg.type = -1;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");} else {sermsg.type = 0;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");}sprintf(regist, "insert into userstat values('%s', %d);", climsg.name, OFF_LINE);if (SQLITE_OK != sqlite3_exec(db, regist, NULL, NULL, &errmsg)) {printf("error: %s \n", errmsg);   }return 0;
}int login(sqlite3 *db, int connfd)
{char login[SQL_LEN];int nrow, ncol;char *errmsg;char **resultp;sprintf(login, "select * from userstat where username='%s' and status=%d;", climsg.name, OFF_LINE);if (0 != sqlite3_get_table(db, login, &resultp, &nrow, &ncol, &errmsg))printf("error: %s \n", errmsg);if (0 == nrow) {sermsg.type = -2;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");return -1;}sprintf(login, "select * from user where username='%s' and password='%s';", climsg.name, climsg.data);if (0 != sqlite3_get_table(db, login, &resultp, &nrow, &ncol, &errmsg))printf("error: %s \n", errmsg);if (1 != nrow) {sermsg.type = -1;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");} else {sermsg.type = 0;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");}sprintf(login, "update userstat set status=%d where username='%s';", ON_LINE, climsg.name);if (SQLITE_OK != sqlite3_exec(db, login, NULL, NULL, &errmsg))printf("error: %s \n", errmsg);    return 0;
}int logout(sqlite3 *db, int connfd)
{char logout[SQL_LEN];char *errmsg;sprintf(logout, "update userstat set status=%d where username='%s';", OFF_LINE, climsg.name);if (SQLITE_OK != sqlite3_exec(db, logout, NULL, NULL, &errmsg))printf("error: %s \n", errmsg); return 0;
}
int quary(sqlite3 *db, int connfd)
{char quary[SQL_LEN];int nrow, ncol;char *errmsg;char **resultp;sprintf(quary, "select explain from dictionary where word='%s';", climsg.data);if (0 != sqlite3_get_table(db, quary, &resultp, &nrow, &ncol, &errmsg))printf("error: %s \n", errmsg);if (0 == nrow) {sermsg.type = -1;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");} else {sermsg.type = 0;sprintf(sermsg.text, "%s", resultp[1]);if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");}sprintf(quary, "insert into history values('%s', '%s');", climsg.name, climsg.data);if (SQLITE_OK != sqlite3_exec(db, quary, NULL, NULL, &errmsg))printf("error to write history\n");return 0;
}int show_history(sqlite3 *db, int connfd)
{char show[SQL_LEN];int i;int nrow, ncol;char *errmsg;char **resultp;sprintf(show, "select word from history where username='%s';", climsg.name);if (0 != sqlite3_get_table(db, show, &resultp, &nrow, &ncol, &errmsg))printf("error: %s \n", errmsg);if (0 == nrow) {sermsg.type = -1;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");} else {for (i = 1; i <= nrow; i++) {sermsg.type = 0;sprintf(sermsg.text, "%s", resultp[i]);printf("%s \n", sermsg.text);if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");}sprintf(sermsg.text, "NULL");printf("%s \n", sermsg.text);if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");}return 0;
}int clear_history(sqlite3 *db, int connfd)
{char clear[SQL_LEN];char *errmsg;sprintf(clear, "delete from history where username='%s';", climsg.name);if (SQLITE_OK != sqlite3_exec(db, clear, NULL, NULL, &errmsg)) {printf("error to clear history\n");sermsg.type = -1;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");} else {sermsg.type = 0;if (-1 == send(connfd, &sermsg, sizeof(sermsg), 0))error_exit("send");}return 0;
}

client.h:

/*************************************************************************> File Name: client.h> Author: Baniel Gao> Mail: createchance@163.com > Created Time: Wed 15 Jan 2014 09:39:40 AM CST************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <error.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/ip.h>#define BUFF_SIZE      32
#define SQL_LEN         512#define MAX_USERNAME 256
#define MAX_WORD        128
#define RET_SIZE        1024#define R               1
#define L               2
#define Q               3
#define H               4
#define S               5
/*clear history*/
#define C               6#define SERVER_IP      "192.168.140.10"
#define SERVER_PORT     50000#define ECHOFLAGS (ECHO | ECHOE | ECHOK | ECHONL)#define error_exit(_errmsg_)  error(EXIT_FAILURE, errno, _errmsg_)typedef struct _client_msg_ {char type;char name[MAX_USERNAME];char data[MAX_WORD];
} climsg_st;typedef struct _server_msg_ {char type;char text[RET_SIZE];
} sermsg_st;void menu(void);
void login_reg(void);
int insert(int sockfd);
int delete(int sockfd);
int show_history(int sockfd);
int clear_history(int sockfd);
int login(int sockfd);
int logout(int sockfd);
int regist(int sockfd);
int set_disp_mode(int fd,int option);
int quary(int sockfd);

client.c:

/*************************************************************************> File Name: client.c> Author: Baniel Gao> Mail: createchance@163.com > Blog: blog.csdn.net/createchance > Created Time: Tue 14 Jan 2014 01:33:49 PM CST************************************************************************/
#include "client.h"climsg_st climsg;
sermsg_st sermsg;int main(void)
{char choice[BUFF_SIZE];int fail_times = 0;int ret;int sockfd;struct sockaddr_in server_addr;socklen_t addrlen;if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))error_exit("socket");server_addr.sin_family = AF_INET;server_addr.sin_port = htons(SERVER_PORT);server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);addrlen = sizeof(server_addr);if (-1 == connect(sockfd, (const struct    sockaddr *)&server_addr, addrlen))error_exit("connect");while (1) {login_reg();while (1) {printf("Please input: ");if (strcmp("\n", fgets(choice, BUFF_SIZE, stdin)) && (2 == strlen(choice)))break;}switch (choice[0]) {case '1':if (!strcmp(choice, "1\n"))while (-1 == (ret = login(sockfd)) || -2 == ret) {if (-1 == ret) {printf("\n\e[31musername or password wrong!\e[0m \n");fail_times++;}elseprintf("\n\e[31m%s has already login!\e[0m \n", climsg.name);if (3 <= fail_times) {printf("\n\e[32mHave no account? Please join us! Do you want to register?(Yes/No):\e[0m ");if (!strcmp("Yes\n", fgets(choice, BUFF_SIZE, stdin)) || !strcmp("yes\n", choice)) {while (-1 == regist(sockfd)) printf("\n\e[31musername has been registered!\e[0m \n");printf("\n\e[32mLet's login now!\e[0m\n");}}}break;case '2':while (-1 == regist(sockfd))printf("\n\e[31musername has been registered!\e[0m \n");printf("\n\e[32mLet's login now!\e[0m\n");while (-1 == (ret = login(sockfd)))printf("\n\e[31musername or password wrong!\e[0m \n");break;case '3':return 0;default:printf("\e[31mUnknown choice!\e[0m \n");}if (0 == ret)break;}while (1) {while (1) {menu();printf("Your choice: ");if (strcmp("\n", fgets(choice, BUFF_SIZE, stdin)), 2 == strlen(choice))break;}switch (choice[0]) {case '1':quary(sockfd);break;case '2':show_history(sockfd);break;case '3':clear_history(sockfd);break;case '4':logout(sockfd);return 0;default:printf("\e[31mUnknown choice!\e[0m \n");}}return 0;
}int set_disp_mode(int fd,int option)
{  int err;  struct termios term;  if(tcgetattr(fd,&term)==-1){  perror("Cannot get the attribution of the terminal");  return 1;  }  if(option)  term.c_lflag|=ECHOFLAGS;  else  term.c_lflag &=~ECHOFLAGS;  err=tcsetattr(fd,TCSAFLUSH,&term);  if(err==-1 && err==EINTR){  perror("Cannot set the attribution of the terminal");  return 1;  }return 0;
}int regist(int sockfd)
{char password_cfm[MAX_WORD];printf("\e[32mJoin us! Just one minute!\e[0m \n");while (1) {printf("username: ");if (strcmp("\n", fgets(climsg.name, MAX_USERNAME, stdin)))break;}climsg.name[strlen(climsg.name) - 1] = '\0';set_disp_mode(STDIN_FILENO, 0);while (1) {printf("password: ");if (!strcmp("\n", fgets(climsg.data, MAX_WORD, stdin)))continue;printf("\nRetype password: ");fgets(password_cfm, BUFF_SIZE, stdin);if (!strcmp(climsg.data, password_cfm))break;elseprintf("\n\e[31mpassword does not match!\e[0m \n");}climsg.data[strlen(climsg.data) - 1] = '\0';climsg.type = R;set_disp_mode(STDIN_FILENO, 1);if (-1 == send(sockfd, &climsg, sizeof(climsg_st), 0)) {printf("Network failure! \n");return -1;}if (-1 == recv(sockfd, &sermsg, sizeof(sermsg_st), 0))printf("Network failure! \n");if (-1 == sermsg.type)return -1;printf("\n\e[32mregister done!\e[0m \n");return 0;
}int logout(int sockfd)
{climsg.type = S;if (-1 == send(sockfd, &climsg, sizeof(climsg_st), 0)) {printf("Network failure! \n");return -1;}return 0;
}int login(int sockfd)
{while (1) {printf("username: ");if (strcmp("\n", fgets(climsg.name, MAX_USERNAME, stdin)))break;}climsg.name[strlen(climsg.name) - 1] = '\0';set_disp_mode(STDIN_FILENO, 0);while (1) {printf("password: ");if (strcmp("\n", fgets(climsg.data, MAX_WORD, stdin)))break;}climsg.data[strlen(climsg.data) - 1] = '\0';climsg.type = L;set_disp_mode(STDIN_FILENO, 1);if (-1 == send(sockfd, &climsg, sizeof(climsg_st), 0)) {printf("Network failure! \n");return -1;}if (-1 == recv(sockfd, &sermsg, sizeof(sermsg_st), 0))printf("Network failure! \n");if (-1 == sermsg.type)return -1;else if (-2 == sermsg.type)return -2;printf("\n\e[32mWelcome %s!\e[0m \n", climsg.name);return 0;
}void login_reg(void)
{printf("*********************************\n");printf("*  1.login  2.register  3.quit  *\n");printf("*********************************\n");
}void menu(void)
{printf("\e[35m****************************************************\n");printf("*  1.quary  2.show history  3.clear history  4.quit*\n");printf("****************************************************\e[0m\n");
}int show_history(int sockfd)
{climsg.type = H;if (-1 == send(sockfd, &climsg, sizeof(climsg), 0)) {printf("\e[31mNetwork failure!\e[0m \n");return -1;}printf("\e[33m-----------------\n");while (1) {if (-1 == recv(sockfd, &sermsg, sizeof(sermsg), 0)) {printf("\e[31mNetwork failure!\e[0m \n");return -1;}if (-1 == sermsg.type) {printf("\e[31mNo history found!\e[0m \n");break;}if (!strcmp("NULL", sermsg.text))break;printf("|\t%s\t|\n", sermsg.text);}printf("\e[33m-----------------\e[0m\n\n");return 0;
}int clear_history(int sockfd)
{climsg.type = C;if (-1 == send(sockfd, &climsg, sizeof(climsg), 0)) {printf("\e[31mNetwork failure!\e[0m \n");return -1;}if (-1 == recv(sockfd, &sermsg, sizeof(sermsg), 0)) {printf("\e[31mNetwork failure!\e[0m \n");return -1;}if (0 == sermsg.type)printf("\e[32mClear done!\e[0m \n");elseprintf("\e[31mClear failed!\e[0m \n");return 0;
}int quary(int sockfd)
{int i;while (1) {printf("Input the word: ");if (!strcmp("\n", fgets(climsg.data, MAX_WORD, stdin)))continue;if (!strcmp("#\n", climsg.data))return -1;climsg.data[strlen(climsg.data) - 1] = '\0';for (i = 0; i < strlen(climsg.data); i++) {if (climsg.data[i] >= 'A' && climsg.data[i] <= 'Z')climsg.data[i] = climsg.data[i] + ' ';else if (climsg.data[i] >= 'a' && climsg.data[i] <= 'z')continue;elsebreak;}if (i != strlen(climsg.data)) {printf("\e[31mInput invalid!\e[0m \n");continue;} elsebreak;}climsg.type = Q;if (-1 == send(sockfd, &climsg, sizeof(climsg), 0)) {printf("\e[31mNetwork failure!\e[0m \n");return -1;}if (-1 == recv(sockfd, &sermsg, sizeof(sermsg), 0))printf("\e[31mNetwork failure!\e[0m \n");if (0 == sermsg.type) {printf("\e[33m----------------------------------------------------------------\n");printf("|%s\t|  %s\n", climsg.data, sermsg.text);printf("----------------------------------------------------------------\e[0m\n");}elseprintf("\e[31mSorry, %s not found!\e[0m \n", climsg.data);return 0;
}

以下是客户端的运行效果：

登陆：

查询：

查询历史记录：

删除历史记录：

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