新手，用C语言连接SQLITE
急问，我要将下面的代码改成连接sqlite数据库的，然后我首先创建数据库int main(int argc, char** argv)
{
sqlite3* pDB = NULL; /* 指向数据库的指针 */
sqlite3_stmt* pStmt = NULL; /* 指向编译后的 SQL 语句的指针 */
int ret = 0;
ret = sqlite3_open("./vbgk.db", &pDB);
if(ret == SQLITE_OK)
{
printf("成功打开数据库!\n");
sqlite3_close(pDB);
pDb = NULL;
}
else
{
printf("打开数据库失败!\n");
}
return 0;
然后插入数据，查询数据是怎么调用的，是不是每一次调用之前都要回调函数
void menuMemorandum()//备忘录
{
//FILE *fp;
char ch;
loop:system("cls"); //调用DOS清屏命令
printf(" ☆☆☆万年历查询☆☆☆\n");
printf("********************************************************************************\n");
printf(" 备忘录 \n");
printf(" =============================================================\n");
printf(" = ****************************************** =\n");
printf(" = **************1.显示所有信息************** =\n");
printf(" = **************2.添加备忘录**************** =\n");
printf(" = **************3.查询备忘录**************** =\n");
printf(" = **************4.修改备忘录**************** =\n");
printf(" = **************5.删除备忘录**************** =\n");
printf(" = **************6.返回主菜单**************** =\n");
printf(" = ****************************************** =\n");
printf(" =============================================================\n");
printf("\n");
ch=getch();
switch(ch)
{
case A:display();
goto loop;
case B:insert();
goto loop;
case C:seek();
goto loop;
case D:modify();
goto loop;
case E:dele();
case F:
system("cls");
printf("\n\n\n\n");
printf("\t\t\t欢迎您再次使用备忘录任务提醒系统!\n\n\n");
printf("\n");
printf("\t\t\t 返回主菜单中 请稍等...\n\n\n");
k=0;
buffer(2);
break;
default:
goto loop;
}
}
void display()//显示信息函数
{
/*Beep(550,120);//声音函数*/
FILE *fp;
int i=0;
if((fp=fopen("备忘录.dat","r"))==NULL)
{
printf("\t\t备忘录不存在!\n\n");
getchar();
printf("\t请您按回车键返回主菜单!\n");
getchar();
system("cls");
exit(1);
}
while(!feof(fp))
{
fread(&memo[i],sizeof(struct memorandum),1,fp);
i++;
}
fclose(fp);
n=i-1;
if(n==0)
{
printf("\t\t备忘录是空的!\n");
getchar();
printf("\t请您按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
printf("\t\t\t备忘录的全部信息:\n\n");
printf("\t\t年\t月\t日\t序号\t内容 \n\n");
for(i=0;i<n;i++)
print(i);
getchar();
printf("\t此备忘录共有信息为：%d个\n\n",n);
printf("\t请按回车键返回主菜单!\n");
getchar();
system("cls");
}
void insert()//添加信息函数
{
FILE *fp;
int i=0,j,flag=1,flag1=0;
char c;
if((fp=fopen("备忘录.dat","r"))==NULL)
{
printf("\t对不起!!!您还未创建任何文件!\n\n");
printf("\t您确定要新建一个名为‘备忘录.dat’的二进制文件吗?\n\n");
printf("\t Y----创建 N----不创建");
getchar();
scanf("%c",&c);
if(c=='Y'||c=='y')
{
if((fp=fopen("备忘录.dat","wb+"))==NULL)
{
printf("\t\t打开文件错误!\n");
exit(0);
}
printf("\t\t恭喜您，创建文件成功!\n\n");
}
else
{
getchar();
printf("\t请您按回车键返回备忘录菜单!\n\n");
getchar();
system("cls");
return;
}
}
while(feof(fp)==0)
{
fread(&memo[i],sizeof(struct memorandum),1,fp);
i++;
}
fclose(fp);
n=i-1;
i=n;
while(1)
{
printf("\t现在文件中的信息数目为：%d\n\n",n);
flag=1;
while(flag==1)
{
flag=0;
printf("\t请您输入第 %d 个信息的序号(退出请输入Q): ",i+1);
scanf("%2s",memo[i].num);
if(memo[i].num[0]=='Q'||memo[i].num[0]=='q')
{
if ((fp=fopen("备忘录.dat","wb"))==NULL)
{
printf ("\t\t\t文件不能打开!\n ");
exit(0);
}
for(i=0;i<n;i++)
if(fwrite(&memo[i],sizeof(struct memorandum),1,fp)!=1)
printf("\t\t\t文件保存错误!\n\n");
fclose(fp);
if(flag1==0){
printf("\t您已经退出备忘录信息添加菜单!\n\n");
printf("\t现在文件中的信息数目为：%d\n\n",n);
}
else{
printf("\t\t\t恭喜您，数据保存成功!\n\n");
printf("\t现在文件中的信息数目为：%d\n\n",n);
}
getchar();
printf("\t请您按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
for(j=0;j<i;j++)
if(strcmp(memo[i].num,memo[j].num)==0)
{
printf("\t该序号已存在，请您检查后重新输入!\n\n");
flag=1;
break;
}
}
printf("\t请您输入第 %d 个信息的年份: ",i+1);
scanf("%s",memo[i].year);
printf("\t请您输入第 %d 个信息的月份: ",i+1);
scanf("%s",memo[i].month);
printf("\t请您输入第 %d 个信息的日期: ",i+1);
scanf("%s",memo[i].day);
printf("\t请您输入第 %d 个信息的内容：",i+1);
scanf("%s",memo[i].messege);
i++;
n=i;
flag1=1;
}
}
void seek()//查询信息函数
{
FILE *fp;
int i=0,flag;
char ch;
char s1[10],s2[10],s3[10];
if((fp=fopen("备忘录.dat","r"))==NULL)
{
printf("\t\t备忘录不存在!\n\n");
getchar();
printf("\t\t请您按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
while(!feof(fp))
{
fread(&memo[i],sizeof(struct memorandum),1,fp);
i++;
}
fclose(fp);
n=i-1;
if(n==0){
printf("\t\t备忘录是空的!\n");
getchar();
printf("\t\t请您按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
system("cls");
printf(" ☆☆☆万年历查询☆☆☆\n");
printf("********************************************************************************\n");
printf(" 查询菜单\n");
printf(" =============================================================\n");
printf(" = ******************************************** =\n");
printf(" = ***************1.按日期查询***************** =\n");
printf(" = ***************2.按序号查询***************** =\n");
printf(" = ***************3.返回主功能菜单************* =\n");
printf(" =============================================================\n");
printf("\t现在文件中的信息数目为：%d\n\n",n);
while(1){
printf("\t请您选择查询菜单编号: ");
scanf("%s",&ch);
flag=0;
switch(ch)
{
case A:
printf("\n\t请您输入要查询的信息的年份: ");
scanf("%s",s1);
printf("\n\t请您输入要查询的信息的月份: ");
scanf("%s",s2);
printf("\n\t请您输入要查询的信息的日期: ");
scanf("%s",s3);
for(i=0;i<n;i++)
if(strcmp(memo[i].year,s1)==0&&strcmp(memo[i].month,s2)==0&&strcmp(memo[i].day,s3)==0)
{
flag=1;
printf("\t\t年份\t月份\t日期\t序号\t内容\n\n");
print(i);
getchar();
printf("\n");
break;
}
if(flag==0)
printf("\t您输入的日期不存在，请您重新选择输入!\n\n");
break;
case B:
printf("\n\t请输入要查询的信息的序号: ");
scanf("%s",s1);
for(i=0;i<n;i++)
if(strcmp(memo[i].num,s1)==0)
{
flag=1;
printf("\t\t年份\t月份\t日期\t序号\t内容\n\n");
print(i);
getchar();
printf("\n");
break;
}
if(flag==0)
printf("\t您输入的序号不存在，请重新选择输入!\n\n"); break;
case C:
getchar();
printf("\t已经退出备忘录信息查询功能菜单!\n\n");
printf("\t按回车键返回主菜单!\n");
getchar();
system("cls");
return;
default:printf("\n error!!! please input again: ");
}
}
}
void modify()//修改信息函数
{
int i=0,n,flag=0;
char ch;
char s1[20];
FILE *fp;
if((fp=fopen("备忘录.dat","r"))==NULL)
{
printf("\t备忘录不存在!\n\n");
getchar();
printf("\t按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
while(!feof(fp))
{
fread(&memo[i],sizeof(struct memorandum),1,fp);
i++;
}
fclose(fp);
n=i-1;
if(n==0)
{
printf("\t备忘录是空的!\n\n");
getchar();
printf("\t按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
while(flag==0)
{
printf("\t现在文件中的信息数目为：%d\n\n",n);
printf("\t请输入您要修改的信息的序号(退出请输入Q): ");
scanf("%s",s1);
if(s1[0]=='Q'||s1[0]=='q'){
printf("\t已经退出备忘录信息修改功能菜单!\n\n");
getchar();
printf("\t按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
for(i=0;i<n;i++)
if(strcmp(memo[i].num,s1)==0)
{
flag=1;
printf("\t\t年份\t月份\t日期\t序号\t内容\n\n");
print(i);
getchar();
n=i;
printf(" 按任意键进入修改菜单");
}
if(flag==0)
{
printf("\t您输入的序号不存在，请您重新输入!\n\n");
}
}
getchar();
loop:
system("cls");
printf(" ☆☆☆万年历查询☆☆☆\n");
printf("********************************************************************************\n");
printf(" 修改菜单\n");
printf(" =============================================================\n");
printf(" = ****************************************** =\n");
printf(" = ****************1.修改年份**************** =\n");
printf(" = ****************2.修改月份**************** =\n");
printf(" = ****************3.修改日期**************** =\n");
printf(" = ****************4.修改序号**************** =\n");
printf(" = ****************5.修改内容**************** =\n");
printf(" = ****************6.返回上一层************** =\n");
printf(" =============================================================\n");
while(1)
{
ch=getch();
switch(ch)
{
case A:
printf(" 请输入新的年份: ");
scanf("%s",s1);
strcpy(memo[n].year,s1);
break;
case B:
printf(" 请输入新的月份: ");
scanf("%s",memo[n].month,s1);
strcpy(memo[n].month,s1);
break;
case C:
printf(" 请输入新的日期 : ");
scanf("%s",s1);
strcpy(memo[n].day,s1);
break;
case D:
printf(" 请输入新的序号: ");
scanf("%2s",s1);
strcpy(memo[n].num,s1);
break;
case E:
printf(" 请输入新的内容: ");
scanf("%s",s1);
case F:
getchar();
printf("\t已经退出了备忘录信息修改功能菜单!;\n\n");
printf("\t按回车键返回主菜单!\n");
getchar();
system("cls");
return;
default:
goto loop;
}
if ((fp=fopen("备忘录.dat","wb"))==NULL)
{
printf ("\t\t\t文件不能打开!\n ");
exit(0);
}
for(i=0;i<n;i++)
if(fwrite(&memo[i],sizeof(struct memorandum),1,fp)!=1)
printf("\t\t\t文件保存错误!\n\n");
fclose(fp);
printf(" 恭喜您，修改成功!\n\n");
}
}
//------------------------------------------------5.删除信息函数--------------------------------------
void dele()//删除信息函数
{
int i=0,j,flag;
char s1[10];
FILE *fp;
if((fp=fopen("备忘录.dat","r"))==NULL)
{
printf("\t备忘录不存在!\n\n");
getchar();
printf("\t\t\t请您按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
while(!feof(fp))
{
fread(&memo[i],sizeof(struct memorandum),1,fp);
i++;
}
fclose(fp);
n=i-1;
if(n==0)
{
printf("\t备忘录是空的!\n");
getchar();
printf("\t\t\t按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
while(1)
{
flag=0;
printf("\t现在文件中的信息数目为：%d\n\n",n);
printf("\t请输入将要删除的信息的序号(Q--退出): ");
scanf("%s",s1);
if(s1[0]=='Q'||s1[0]=='q')
{
printf("\t已经退出信息删除功能菜单!\n\n");
printf("\t现在文件中的信息数目为：%d\n\n",n);
getchar();
printf(" 按回车键返回主菜单!\n");
getchar();
system("cls");
return;
}
for(i=0;i<n;i++)
if(strcmp(memo[i].num,s1)==0)
{
flag=1;
printf("\t\t年份\t月份\t日期\t序号\t内容\n\n");
print(i);
getchar();
printf("\t是否确定要删除该条信息？Y----确定 N----取消");
gets(s1);
if(s1[0]=='N'||s1[0]=='n')
{
printf("\t已经取消了删除该信息!\n\n");
getchar();
break;
}
for(j=i;j<n-1;j++)
memo[j]=memo[j+1];
n--;
if((fp=fopen("备忘录.dat","wb"))==NULL)
{
printf ("\t\t\t文件不能打开!\n ");
exit(0);
}
for(i=0;i<n;i++)
if(fwrite(&memo[i],sizeof(struct memorandum),1,fp)!=1)
printf("\t\t\t文件保存错误!\n\n");
fclose(fp);
printf("恭喜您，删除成功!\n\n");
}
if(flag==0)
printf(" error!!!please input again: \n");
}
}
