字典查找对应输入的字符

2024/10/25 1:22:19 来源：https://blog.csdn.net/weixin_63722559/article/details/141687531 浏览: 次关键词：字典查找对应输入的字符

一、将文件放入到数据库


#include<stdio.h>
#include<sqlite3.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
int main(int agrc,char *agrv[])
{FILE *fp;fp= fopen("./dict.txt","r");if(fp == NULL){perror("fopen fail");return -1;}char buf[1024] = {0};sqlite3 *pdb;int ret = sqlite3_open("./stu.db",&pdb);if(ret != SQLITE_OK){fprintf(stderr,"sqlite3_open fail : %s\n",sqlite3_errmsg(pdb));return -1;}char *sql = "create table if not exists class6(id INTEGER PRIMARY KEY AUTOINCREMENT,word TEXT,meaning TEXT);";ret = sqlite3_exec(pdb,sql,NULL,NULL,NULL);if(ret != SQLITE_OK){fprintf(stderr,"sqlite3_open1 fail: %s\n",sqlite3_errmsg(pdb));sqlite3_close(pdb);return -1;}while(!feof(fp)){char *buf1[2];char buf2[1024] = {0};memset(buf,0,sizeof(buf));fgets(buf,sizeof(buf),fp);buf1[0] = strtok(buf," ");buf1[1]  = strtok(NULL,"\r");sprintf(buf2,"insert into class6 values(NULL,\"%s\",\"%s\")",buf1[0],buf1[1]);sql = buf2;ret = sqlite3_exec(pdb,sql,NULL,NULL,NULL);if(ret !=SQLITE_OK){fprintf(stderr,"sqlite3_open2 fail : %s\n",sqlite3_errmsg(pdb));sqlite3_close(pdb);return -1;}}
sqlite3_close(pdb);
fclose(fp);
return 0;
}

二、查找数据库

#include<stdio.h>
#include<sqlite3.h>
#include<string.h>
char buf[100] = {0};
int callback(void *arg,int column_cnt,char **column_value,char **column_name)
{if(strcmp(column_value[0],buf) == 0){printf("meaning = %s\n",column_value[1]);}return 0;
}
int main(int agrc,char *agrv[])
{sqlite3 *pdb;:int ret = sqlite3_open("./stu.db",&pdb);if(ret != SQLITE_OK){fprintf(stderr,"sqlite3_open fail : %s\n",sqlite3_errmsg(pdb));return -1;}char *sql = "select word,meaning from class6;";fgets(buf,sizeof(buf),stdin);buf[strlen(buf) + 1] = '\0';ret = sqlite3_exec(pdb,sql,callback,NULL,NULL);if(ret != SQLITE_OK){fprintf(stderr,"sqlite3_open1 fail: %s\n",sqlite3_errmsg(pdb));sqlite3_close(pdb);return -1;}sqlite3_close(pdb);return 0;
}

三、用到的函数

3.1、fgets()

fgets函数函数用来从stream所指文件中读入buf[size-1]个字符放入buf为起始地址的空间内;如果在未读满bufsize-1个字符之时，已读到一个换行符或一个EOF(文件结束标志)，则结束本次读操作，读入的字符串中最后包含读到的换行符。并在结尾处加上“\0”组成一个字符串，存入“字符串指针”中。若函数调用成功，则返回存放字符串的首地址；若读到文件结尾处或调用失败时，则返回字符常量 NULL。或者已经读到size -1,这个时候注意，我们如果要读文件，读这个数据的时候，若已经放满了，则没有\0，会造出读的时候指针越界，因此在只读[sizeof - 1]。当他把一行读完，文件流指针，会自动指向下一个。