C语言实现图书馆管理系统

#include <stdio.h>
#include<string.h>
#include<stdlib.h>
#include <mysql.h>
#pragma comment (lib,"libmysql.lib")

//#pragma comment ( lib,"xxx.lib" )  
//表示?接xxx.lib?@???欤?告?V??g器你要用到xxx.lib??
//和在工程?O置?e??上?入xxx.lib的效果一?樱?不?^?@?N方法??的程序?e人在使用你的代?a的?r候就不用再?O置工程settings了。

MYSQL mysql;
MYSQL_RES *result;  //定义结果集变量
MYSQL_ROW row;  //定义行变量
char ch[2];

void inquire() {
 void menu();
 printf("\n\t显示主清单<y/n>\n");
 scanf("%s", ch);
 if (strcmp(ch, "y") == 0 || strcmp(ch, "Y") == 0) {
  menu();
 }
 else exit(0);
}

void ShowAll() {
 system("cls");
 mysql_init(&mysql);
 mysql_query(&mysql, "set names 'utf8'");
 if (!mysql_real_connect(&mysql, "localhost", "root", "密码", "db_book", 0, NULL, 0))
  printf("\ncan't connect db_book!\n");
 else
 {
  if (mysql_query(&mysql, "select * from tb_book"))
  {
   printf("查询失败\n");
  }
  else {
   puts("\t|=====================================================|\n");
   puts("\t|              显 示 所 有 图 书 信 息                |\n");
   puts("\t|=====================================================|\n");
   puts("\t|    图书编号       图书名       作者       出版社    |\n");
   result = mysql_store_result(&mysql);
   if (mysql_num_rows(result)) {
    while (row = mysql_fetch_row(result))
    {
 printf("\t\t%s\t     %s\t         %s\t    %s\n", row[0], row[1], row[2], row[3]);
    }
   }
   mysql_free_result(result);
  }
  puts("\t|=====================================================|\n");
  getchar();
  mysql_close(&mysql);//关闭连接
 }
}

void AddBook() {
 char id[10];
 char bookname[10],author[10], bookconcern[10], *sql;
 char dest[100] = { " " };
 system("cls");
 mysql_init(&mysql);
 if (!mysql_real_connect(&mysql, "localhost", "root", "xin088748*", "db_book", 0, NULL, 0))
  printf("can not connect\n");
 else {
  if (mysql_query(&mysql, "select * from tb_book")) {
   printf("can not open\n");
  }
  else
  {
   result = mysql_store_result(&mysql);
   mysql_num_rows(result);
   row = mysql_fetch_row(result);
   printf("\tID:");
   scanf("%s", id);
   if (mysql_num_rows(result)) {
    do {
     if (!strcmp(id, row[0])) {
      printf("\t记录存在");
      getchar();
      mysql_free_result(result);
      mysql_close(&mysql);
      return;
     }
    } while (row = mysql_fetch_row(result));
   }

   printf("\t图书名：");
   scanf("%s", bookname);
   printf("\t作者：");
   scanf("%s", author);
   printf("\t出版社：");
   scanf("%s", bookconcern);
   sql = "insert into tb_book (ID,bookname,author,bookconcern) values('";
   strcat(dest, sql);
   strcat(dest, id);
   strcat(dest, "','");
   strcat(dest, bookname);
   strcat(dest, "','");
   strcat(dest, author);
   strcat(dest, "','");
   strcat(dest, bookconcern);
   strcat(dest, "')");
   if (mysql_query(&mysql, dest))
    //fprintf(stderr, "error!", mysql_error(&mysql));
    printf("error!\n");
   else
   {
    mysql_free_result(result);
   }
  }
  mysql_close(&mysql);//关闭连接
 }
}

void ModifyBook() {
 system("cls");
 char dest[100];
 mysql_init(&mysql);
 mysql_query(&mysql, "set name 'utf8'");
 if (!mysql_real_connect(&mysql, "localhost", "root", "xin088748*", "db_book", 0, NULL, 0)) { puts("can't net mysql\n");
 return;
 }
 else {
  char id[10],*sql;
  char dest[100] = {" "};
  printf("请输入你要修改的图书编号：");
  scanf("%s", id);
  sql = "select * from tb_book where ID = ";
  strcat(dest, sql);
  strcat(dest, id);
  if (mysql_query(&mysql, dest)) {
   printf("\n  查询数据表失败\n");
  }
  else {
   result = mysql_store_result(&mysql);
   if (mysql_num_rows(result)) {
    puts("\t|=====================================================|\n");
    puts("\t|              显 示 所 有 图 书 信 息                |\n");
    puts("\t|=====================================================|\n");
    puts("\t|    图书编号       图书名       作者       出版社    |\n");
    while (row = mysql_fetch_row(result)) {
     printf("\t\t%s\t     %s\t          %s\t     %s\n", row[0], row[1], row[2], row[3]);
    }
    printf("Mondify? <y/n>\n");
    scanf("%s", ch);
    if (!strcmp(ch, "Y") || !strcmp(ch, "y")) {
     char bookname[10], author[10], bookconcern[10];
     char dest1[100] = {" "};
      printf("\t图书名：");
      scanf("%s", bookname);
      printf("\t作者：");
      scanf("%s", author);
      printf("\t出版社：");
      scanf("%s", bookconcern);
      sql = "update tb_book set bookname = '";
      strcat(dest1, sql);
      strcat(dest1, bookname);
      strcat(dest1, "',author = '");
      strcat(dest1, author);
      strcat(dest1, "',bookconcern = '");
      strcat(dest1, bookconcern);
      strcat(dest1, "' where ID = '");
      strcat(dest1, id);
      strcat(dest1, "'");
      if (mysql_query(&mysql,dest1)) printf("修改失败\n");
      else printf("修改成功\n");
    }
   }
   else
   {
    printf("没有发现要修改的信息\n");

   }
   mysql_free_result(result);
  }
 }
 mysql_close(&mysql);
}

void DeleteBook() {
 system("cls");
 mysql_init(&mysql);
 if (!mysql_real_connect(&mysql, "localhost", "root", "xin088748*", "db_book", 0, NULL, 0)) {
  printf("can't net mysql\n");
 }
 else {
  printf("你想要删除的编号：");
  char id[10];
  scanf("%s", id);
  char dest[100] = { " " };
  char *sql;
  sql = "select * from tb_book where ID = ";
  strcat(dest, sql);
  strcat(dest, id);
  if (mysql_query(&mysql, dest)) {
   printf("\n  查询数据表失败\n");
  }
  else {
   result = mysql_store_result(&mysql);
   if (mysql_num_rows(result)) {
    puts("\t|=====================================================|\n");
    puts("\t|              显 示 所 有 图 书 信 息                |\n");
    puts("\t|=====================================================|\n");
    puts("\t|    图书编号       图书名       作者       出版社    |\n");
    while (row = mysql_fetch_row(result)) {
     printf("\t\t%s\t     %s\t          %s\t     %s\n", row[0], row[1], row[2], row[3]);
    }
    printf("Delete? <y/n>\n");
    scanf("%s", ch);
    if (!strcmp(ch, "Y") || !strcmp(ch, "y")) {
     char dest1[100] = { " " };
     sql = "delete from tb_book where ID = ";
     strcat(dest1, sql);
     strcat(dest1, id); 
     printf("\n%s\t", dest1);
     if (mysql_query(&mysql, dest1)) printf("删除失败\n");
     else printf("删除成功\n");
    }
   }
   else puts("没有查询到此数据\n");
   mysql_free_result(result);
  }
 }
 mysql_close(&mysql);
}

void Querybook() {
 system("cls");
 mysql_init(&mysql);
 if (!mysql_real_connect(&mysql, "localhost", "root", "xin088748*", "db_book", 0, NULL, 0)) {
  puts("can't net mysql\n");
  return;
 }
 else {
  char id[10];
  char *sql, dest[100] = {" "};
  printf("请输入要查询的图书编号：\n");
  scanf("%s", id);
  sql = "select * from tb_book where ID = ";
  strcat(dest, sql);
  strcat(dest, id);
  if (mysql_query(&mysql, dest)) printf("查询失败\n");
  else {
   result = mysql_store_result(&mysql);
   if (mysql_num_rows(result)) {
    puts("\t|=====================================================|\n");
    puts("\t|              显 示 所 有 图 书 信 息                |\n");
    puts("\t|=====================================================|\n");
    puts("\t|    图书编号       图书名       作者       出版社    |\n");
    while (row = mysql_fetch_row(result)) {
     printf("\t\t%s\t     %s\t          %s\t     %s\n", row[0], row[1], row[2], row[3]);
    }
   }
   else puts("没有发现要查询的数据\n");
   mysql_free_result(result);
  }
 }
 mysql_close(&mysql);
}

void menu() {
 puts("\t|=====================================================|\n");
 puts("\t|         Welcome To Lemon Books System               |\n");
 puts("\t|=====================================================|\n");
 puts("\t|            1 - 显示所有图书信息                     |\n");
 puts("\t|            2 - 添加图书信息                         |\n");
 puts("\t|            3 - 修改图书信息                         |\n");
 puts("\t|            4 - 删除图书信息                         |\n");
 puts("\t|            5 - 查询图书信息                         |\n");
 puts("\t|            6 - 退出图书系统                         |\n");
 puts("\t|=====================================================|\n\n");

 puts("\tENTER YOUR CHOICE<1-6>\n");
 int i;
 scanf("%d", &i);
 while (i > 0 && i < 7) {
  switch (i) {
  case 1:ShowAll(); inquire(); break;
  case 2:AddBook(); inquire(); break;
  case 3:ModifyBook(); inquire(); break;
  case 4:DeleteBook(); inquire(); break;
  case 5:Querybook(); inquire(); break;
  default:puts("enter error!please enter again\n"); exit(0);
  }
  scanf("%d",&i);
 }
}

int main()
{
 menu();
}