Linux +C+sqlite3 一个简单的学生管理系统

#include<stdio.h>
#include<stdlib.h>
#include<sqlite3.h>
#include<string.h>
char *errmsg;

void insert_data(sqlite3 *db)
{
int number,age,score;
char name[20];

printf("input the number: ");
scanf("%d",&number);
getchar();
printf("input the name: ");
scanf("%s",name);
getchar();
printf("input the age: ");
scanf("%d",&age);
getchar();
printf("input the score ");
scanf("%d",&score);
getchar();

char *sql=sqlite3_mprintf("insert into student values('%d','%s','%d','%d')",number,name,age,score);

if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
{
perror("sqlite3_exec");
exit(-1);
}
else
printf("insert success!!\n");
return;
}

void delete_data(sqlite3 *db)
{
int num;
printf("please input the number you want to delete\n");
scanf("%d",&num);
getchar();
char *sql=sqlite3_mprintf("delete from student where number ='%d'",num);

if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
{
perror("sqlite3_exec_delete");
exit(-1);
}
else
printf("delete success!!\n");
return;

}

void updata_data(sqlite3 * db)
{
int num,age,score;
char name[20];

printf("please input the number you want to updata\n");
scanf("%d",&num);
getchar();
printf("input the name: ");
scanf("%s",name);
getchar();
printf("input the age: ");
scanf("%d",&age);
getchar();
printf("input the score ");
scanf("%d",&score);
getchar();

//	char sql[1024];
//	sprintf(sql,"update student set name='%s',age='%d',score='%d' where number='%d'",name,age,score,num);
char *sql=sqlite3_mprintf("update student set name='%s',age='%d',score='%d' where number='%d'",name,age,score,num);

if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
{
perror("sqlite3_exec_update");
exit(-1);
}
else
printf("update success!!\n");
return;

}

void show_data(sqlite3 *db)
{
char ** resultp;
int nrow,ncolumn,i,j,index;
char *sql="select * from student";

if(sqlite3_get_table(db,sql,&resultp,&nrow,&ncolumn,&errmsg) != SQLITE_OK)
{
perror("sqlite3_get_table");
exit(-1);
}

index = ncolumn;
for(i = 0 ;i< ncolumn; i++)
printf("%s\t",resultp[i]);
printf("\n");

for(i = 0;i< nrow;i++)
{
for(j = 0;j< ncolumn;j++)
printf("%s\t",resultp[index++]);
printf("\n");
}
return ;
}
void quit(sqlite3 *db)
{
printf("BYBYE!!\n");
sqlite3_close(db);
exit(0);
}
int main()
{
int nu;
sqlite3 *db;
if(sqlite3_open("my.db",&db) != SQLITE_OK)
{
perror("sqlite3_open");
exit(-1);
}

while(1)
{
printf("**********************\n");
printf("*   1.insert data    *\n");
printf("*   2.delete data    *\n");
printf("*   3.updata data    *\n");
printf("*   4.show   data    *\n");
printf("*   5. quit          *\n");
printf("**********************\n");
printf("please input the number you want to operate:\n");
scanf("%d",&nu);
getchar();
switch(nu)
{
case 1:
insert_data(db);
break;
case 2:
delete_data(db);
break;
case 3:
updata_data(db);
break;
case 4:
show_data(db);
break;
case 5 :
quit(db);
break;
}
}
return 0;
}