做一个简单数据库终端操作系统

#include <myhead.h>
int main(int argc, const char *argv[])
{
	int id;
	char name[16];
	float score;
	sqlite3 *p=NULL;
	if(sqlite3_open("./my.db",&p)!=SQLITE_OK)
	{
		printf("sqlite3_open error\n");
		return -1;
	}     
	int flag;
	char cmd[256]={0};
	char *errmsg=NULL;
	//创建表
	strcpy(cmd,"create table if not exists stu(id int primary key,name char,score float);");
	if(sqlite3_exec(p,cmd,NULL,NULL,&errmsg)!=SQLITE_OK)
	{
		printf("创建表失败\n");
		return -1;
	}
	while(1)
	{
		system("clear");
		printf("=============XXX 学生管理系统================\n");
		printf("=============1. 添加学生信息=================\n");
		printf("=============2. 删除学生信息=================\n");
		printf("=============3. 修改学生信息=================\n");
		printf("=============0. 退出系统=====================\n");
		printf("请输入操作:");
		scanf("%d",&flag);
		while(getchar()!=10);
		memset(cmd,0,sizeof(cmd));
		switch(flag)
		{
		case 1:
			printf("请输入学号:");
			scanf("%d",&id);
			while(getchar()!=10);
			printf("请输入姓名:");
			scanf("%s",name);
			while(getchar()!=10);
			printf("请输入成绩:");
			scanf("%f",&score);
			while(getchar()!=10);
			sprintf(cmd,"insert into stu values(%d,\"%s\",%f);",id,name,score);
			if(sqlite3_exec(p,cmd,NULL,NULL,&errmsg)!=SQLITE_OK)
			{
				printf("%s\n",errmsg);
			}
			break;

		case 2:
			printf("请输入要删除的学生学号:");
			scanf("%d",&id);
			sprintf(cmd,"delete from stu where id=%d;",id);
			if(sqlite3_exec(p,cmd,NULL,NULL,&errmsg)!=SQLITE_OK)
			{
				printf("%s\n",errmsg);
			}
			break;
		case 3:
			printf("请输入学号:");
			scanf("%d",&id);
			while(getchar()!=10);
			printf("请输入姓名:");
			fgets(name,sizeof(name),stdin);
			name[strlen(name)-1]='\0';
			printf("请输入成绩:");
			scanf("%f",&score);
			while(getchar()!=10);
			sprintf(cmd,"update stu set name=\"%s\",score=%f where id=%d;",name,score,id);
			if(sqlite3_exec(p,cmd,NULL,NULL,&errmsg)!=SQLITE_OK)
			{
				printf("%s\n",errmsg);
			}
			break;
		case 0:
			goto end;
		default:
			printf("输入错误请重新输入\n");
			break;
		}
		printf("输入回车清屏重新操作\n");
		while(getchar()!=10);
	}
end:
	sqlite3_close(p);
	return 0;
}