用数据库写通讯录

#include <stdio.h>
#include <sqlite3.h>
#include <stdlib.h>


#define OK 1
#define ERROR 0
//#define int Status


/*Status insert(void); //插入
Status update(void); //修改
Status delete(void); //删除
Status query(void);  //显示
*/


void insert(void)
{
    sqlite3 *db;
char *errmsg;
int ret = sqlite3_open("info.db",&db);
if(SQLITE_OK != ret)
{
perror("sqlite3_open");
exit(1);
}


int id,age;
char name[20];
printf("insert : Please input:id name age\n");
scanf("%d %s %d",&id,name,&age);
char sql[1024] = {0};
sprintf(sql,"insert into stu values(%d,'%s',%d);",id,name,age);
// insert into stu values(1,'Li',18);
ret = sqlite3_exec(db,sql,NULL,NULL,&errmsg);
if(SQLITE_OK != ret)
{
printf("error : %s\n",errmsg);
exit(2);
}

  ret = sqlite3_close(db);
  if(SQLITE_OK != ret)
  {
  perror("sqlite3_close");
  exit(3);
  }
printf("插入成功\n");
}




void update(void)
{
    sqlite3 *db;
char *errmsg;
int ret = sqlite3_open("info.db",&db);
if(SQLITE_OK != ret)
{
perror("sqlite3_open");
exit(1);
}


int id;
char name[20];
printf("update : Please input:id name\n");
scanf("%d %s",&id,name);
char sql[1024] = {0};
sprintf(sql,"update stu set name = '%s' where id = %d",name,id);
ret = sqlite3_exec(db,sql,NULL,NULL,&errmsg);
if(SQLITE_OK != ret)
{
perror("sqlite_exec");
printf("error : %s\n",errmsg);
exit(2);
}

  ret = sqlite3_close(db);
  if(SQLITE_OK != ret)
  {
  perror("sqlite3_close");
  exit(3);
  }
printf("修改成功\n");
}

void delete(void)
{
    sqlite3 *db;
char *errmsg;
int ret = sqlite3_open("info.db",&db);
if(SQLITE_OK != ret)
{
perror("sqlite3_open");
exit(1);
}

int id;
printf("delete : Please input:id\n");
scanf("%d",&id);
char sql[1024] = {0};
sprintf(sql,"delete from stu where id = %d;",id);
ret = sqlite3_exec(db,sql,NULL,NULL,&errmsg);
if(SQLITE_OK != ret)
{
perror("sqlite_exec");
printf("error : %s\n",errmsg);
exit(2);
}

  ret = sqlite3_close(db);
  if(SQLITE_OK != ret)
  {
  perror("sqlite3_close");
  exit(3);
  }
printf("删除成功\n");
}


void query(void)
{
    sqlite3 *db;
char *errmsg;
char **result;
int row,column;


int ret = sqlite3_open("info.db",&db);
if(SQLITE_OK != ret)
{
perror("sqlite3_open");
exit(1);
}
       char sql[1024] = "select * from stu;";
ret = sqlite3_get_table(db,sql,&result,&row,&column,&errmsg);
if(SQLITE_OK != ret)
{
printf("error : %s\n",errmsg);
exit(2);
}


printf("row = %d,column = %d\n",row,column);


int i,j;
for(i = 0;i <= row;i++)
{
for(j = 0;j < column;j++)
{
printf("%10s|",result[i*column + j]);
}
printf("\n");
}


sqlite3_free_table(result);

  ret = sqlite3_close(db);
  if(SQLITE_OK != ret)
  {
  exit(3);
  }
printf("显示成功\n");
}


int main()
{   
    sqlite3 *db;
char *errmsg;
int sel;
int ret = sqlite3_open("info.db",&db);
if(SQLITE_OK != ret)
{
perror("sqlite3_open");
exit(1);
}
char *sql = "create table stu(id integer primary key,name text,age integer)";
ret = sqlite3_exec(db,sql,NULL,NULL,&errmsg);
if(SQLITE_OK != ret)
{
printf("error : %s\n",errmsg);
exit(2);
}
  ret = sqlite3_close(db);
  if(SQLITE_OK != ret)
  {
  exit(3);
  }
    while(1)
   { 
      printf("\t************************************\n");
      printf("\t\tmenu:\n");
 printf("\t\t1:插入联系人\n");
 printf("\t\t2:修改联系人信息\n");
 printf("\t\t3:删除联系人信息\n");
 printf("\t\t4:显示联系人信息\n");
 printf("\t\t5:退出\n");
      printf("\t************************************\n");
      scanf("%d",&sel);
      switch(sel)
      {
         case 1:
           insert();
           break;
    case 2:
           update();
           break;
    case 3:
delete();
break;
    case 4: 
query();
break;
    case 5:
printf("欢迎再次光临!\n");
return 0;
      }
    }
}