利用ODBC数据源、Sql Server和VS2019编写图书管理系统

连接.h

#pragma once
#include
#include
#include
#include
#include
#include
char Account[50], Password[50], a[50], p[50];
SQLRETURN   ret;
SQLHENV    henv;
SQLHDBC    hdbc;
SQLHSTMT  hstmt;
void lianjie()
{
     
	ret = SQLAllocHandle(SQL_HANDLE_ENV, NULL, &henv);//申请环境句柄
	ret = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_INTEGER);
	ret = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);//申请数据库连接句柄

	ret = SQLConnect(hdbc, (SQLCHAR*)"wb", SQL_NTS, (SQLCHAR*)"sa", SQL_NTS, (SQLCHAR*)"123456", SQL_NTS);
	/*data_test为配置的ODBC数据源名称*/
	if (!(ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO))
	{
     
		printf("连接数据库失败!\n");
	}
	else {
     
		printf("连接数据库成功!\n");
	}                                      /*到这是用odbc连接到数据库，可以用到我们建立的study数据库里的数据了*/
	ret = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
}

断开连接.h

#pragma once
#include"连接.h"
void duankai() {
     
	SQLFreeHandle(SQL_HANDLE_DBC, hdbc);//释放连接句柄
	SQLFreeHandle(SQL_HANDLE_ENV, henv);//释放环境句柄
}

main.c

#include"连接.h"
#include"断开连接.h"
#include
int main()
{
     
	system("color 70");
	int s;
	printf("*************************************************************\n");
	printf("*************************************************************\n");
	printf("******************欢迎使用图书馆操作软件!********************\n");
	printf("*************************************************************\n");
	printf("*************************************************************\n");
	printf("请输入:\n1:管理员登录\n2:工作人员登录\n3:学生登录\n");
	scanf("%d", &s);
	switch (s)
	{
     
	case 1://系统管理员登录系统模块
	{
     
		lianjie();
		printf("请输入登录账号：\n");
		scanf("%s", Account);
		printf("请输入登录密码：\n");
		scanf("%s", Password);
		SQLCHAR sql3[] = "use study";
		SQLCHAR sql4[] = "select * from admin";
		ret = SQLExecDirect(hstmt, sql3, SQL_NTS);
		ret = SQLExecDirect(hstmt, sql4, SQL_NTS);
		if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
		{
     
			SQLCHAR str1[50], str2[50];
			SQLINTEGER len_str1, len_str2;
			while (SQLFetch(hstmt) != SQL_NO_DATA)
			{
     
				SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
				SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);

				for (int i = 0; i < 8; i++)
				{
     
					a[i] = str1[i];
				}
				for (int i = 0; i < 6; i++)
				{
     
					p[i] = str2[i];
				}
				if (strcmp(Account, a) == 0 && strcmp(Password, p) == 0 || strcmp(Account, a) == 0 && strcmp(Password, p) == 0)
				{
     
					printf("登录成功\n");
					int x;
					duankai();
					printf("请输入:\n1:查询图书信息\n2:查询学生信息\n3:查询工作人员信息\n4:增加一条信息\n5:修改一条信息\n6:删除一条信息\n");
					scanf("%d", &x);
					switch (x)
					{
     
					case 1:
					{
      lianjie();
					SQLCHAR sql1[] = {
      "use study" };
					SQLCHAR sql2[] = {
      "select * from book" };

					ret = SQLExecDirect(hstmt, sql1, SQL_NTS);
					ret = SQLExecDirect(hstmt, sql2, SQL_NTS);
					if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
					{
     
						SQLCHAR str1[50], str2[50], str3[50], str4[50], str5[50];
						SQLINTEGER len_str1, len_str2, len_str3, len_str4, len_str5;
						while (SQLFetch(hstmt) != SQL_NO_DATA)
						{
     
							SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
							SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);
							SQLGetData(hstmt, 3, SQL_C_CHAR, str3, 50, &len_str3);
							SQLGetData(hstmt, 4, SQL_C_CHAR, str4, 50, &len_str4);
							SQLGetData(hstmt, 5, SQL_C_CHAR, str5, 50, &len_str5);
							printf("%s\t%s\t%s\t%s\t%s\t\n", str1, str2, str3, str4, str5);
						}
					}
					}
					duankai(); break;
					case 2:
					{
     
						lianjie();
						SQLCHAR sql1[] = {
      "use study" };
						SQLCHAR sql2[] = {
      "select * from reader" };

						ret = SQLExecDirect(hstmt, sql1, SQL_NTS);
						ret = SQLExecDirect(hstmt, sql2, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							SQLCHAR str1[50], str2[50], str3[50], str4[50], str5[50];
							SQLINTEGER len_str1, len_str2, len_str3, len_str4, len_str5;
							while (SQLFetch(hstmt) != SQL_NO_DATA)
							{
     
								SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
								SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);
								SQLGetData(hstmt, 3, SQL_C_CHAR, str3, 50, &len_str3);
								SQLGetData(hstmt, 4, SQL_C_CHAR, str4, 50, &len_str4);
								SQLGetData(hstmt, 5, SQL_C_CHAR, str5, 50, &len_str5);
								printf("%s\t%s\t%s\t%s\t%s\t\n", str1, str2, str3, str4, str5);
							}
						}
					}duankai(); break;
					case 3:
					{
     
						lianjie();
						SQLCHAR sql1[] = {
      "use study" };
						SQLCHAR sql2[] = {
      "select * from workman" };

						ret = SQLExecDirect(hstmt, sql1, SQL_NTS);
						ret = SQLExecDirect(hstmt, sql2, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							SQLCHAR str1[50], str2[50], str3[50], str4[50];
							SQLINTEGER len_str1, len_str2, len_str3, len_str4;
							while (SQLFetch(hstmt) != SQL_NO_DATA)
							{
     
								SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
								SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);
								SQLGetData(hstmt, 3, SQL_C_CHAR, str3, 50, &len_str3);
								SQLGetData(hstmt, 4, SQL_C_CHAR, str4, 50, &len_str4);
								printf("%s\t%s\t%s\t%s\t\n", str1, str2, str3, str4);
							}
						}
					}duankai(); break;
					case 4:
					{
     
						lianjie();
						int g;
						printf("请输入你想增加数据的表:\n1:图书信息表\n2:读者信息表\n3:工作人员表\n");
						scanf("%d", &g);
						switch (g)
						{
     
						case 1: {
     
							char w[] = {
      " '," };
							char b[] = {
      " ' " };
							char i[] = {
      ")" };
							SQLCHAR l[1000] = {
      "insert into dbo.book(b_no,b_name,author,publisher,price)values('" };
							char d[50];
							printf("请输入图书编号:\n");
							scanf("%s", d);
							strcat((char*)l, d);
							strcat((char*)l, w);
							char e[50];
							printf("请输入图书名称:\n");
							scanf("%s", e);
							strcat((char*)l, b);
							strcat((char*)l, e);
							strcat((char*)l, w);
							char r[50];
							printf("请输入图书作者:\n");
							scanf("%s", r);
							strcat((char*)l, b);
							strcat((char*)l, r);
							strcat((char*)l, w);
							char y[50];
							printf("请输入图书出版社:\n");
							scanf("%s", y);
							strcat((char*)l, b);
							strcat((char*)l, y);
							strcat((char*)l, w);
							char u[50];
							printf("请输入图书价格:\n");
							scanf("%s", u);
							strcat((char*)l, b);
							strcat((char*)l, u);
							strcat((char*)l, b);
							strcat((char*)l, i);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");

							}
							else {
     
								printf("操作失败\n");
							}
						}
						case 2: {
     
							char w[] = {
      " '," };
							char b[] = {
      " ' " };
							char i[] = {
      ")" };
							SQLCHAR l[1000] = {
      "insert into dbo.reader(r_no,r_name,enabled,tele,pwd)values('" };
							char d[50];
							printf("请输入读者编号:\n");
							scanf("%s", d);
							strcat((char*)l, d);
							strcat((char*)l, w);
							char e[50];
							printf("请输入读者姓名:\n");
							scanf("%s", e);
							strcat((char*)l, b);
							strcat((char*)l, e);
							strcat((char*)l, w);
							char r[50];
							printf("请输入证件是否有效:(on或者off）\n");
							scanf("%s", r);
							strcat((char*)l, b);
							strcat((char*)l, r);
							strcat((char*)l, w);
							char y[50];
							printf("请输入联系电话:\n");
							scanf("%s", y);
							strcat((char*)l, b);
							strcat((char*)l, y);
							strcat((char*)l, w);
							char u[50];
							printf("请输入登录密码:\n");
							scanf("%s", u);
							strcat((char*)l, b);
							strcat((char*)l, u);
							strcat((char*)l, b);
							strcat((char*)l, i);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");

							}
							else
							{
     
								printf("操作失败\n");
							}
						}
						case 3:
						{
     
							char w[] = {
      " '," };
							char b[] = {
      " ' " };
							char i[] = {
      ")" };
							SQLCHAR l[1000] = {
      "insert into dbo.workman(work_no,work_name,tele,pwd)values('" };
							char d[50];
							printf("请输入工作证号:\n");
							scanf("%s", d);
							strcat((char*)l, d);
							strcat((char*)l, w);
							char e[50];
							printf("请输入工人姓名:\n");
							scanf("%s", e);
							strcat((char*)l, b);
							strcat((char*)l, e);
							strcat((char*)l, w);
							char r[50];
							printf("请输入联系电话:\n");
							scanf("%s", r);
							strcat((char*)l, b);
							strcat((char*)l, r);
							strcat((char*)l, w);
							char u[50];
							printf("请输入登录密码:\n");
							scanf("%s", u);
							strcat((char*)l, b);
							strcat((char*)l, u);
							strcat((char*)l, b);
							strcat((char*)l, i);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");

							}
							else {
     
								printf("操作失败\n");
							}
						}
						break;
						}
						duankai(); break;
					case 5: {
     
						lianjie();
						int g;
						printf("请输入想重置密码人的身份:\n1:读者\n2:工作人员\n");
						scanf("%d", &g);
						switch (g)
						{
     
						case 1: {
     
							SQLCHAR l[1000] = {
      "update dbo.reader set pwd =  " };
							SQLCHAR k[1000] = {
      " where r_no =  " };
							char d[50];
							printf("请输入想修改密码的读者号:\n");
							scanf("%s", d);
							strcat((char*)k, d);
							char e[50];
							printf("请输入新密码:\n");
							scanf("%s", e);
							strcat((char*)l, e);
							strcat((char*)l, (char*)k);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");
							}
							else {
     
								printf("操作失败\n");
							}
						}break;
						case 2: {
     
							SQLCHAR l[1000] = {
      "update dbo.workman set pwd =  " };
							SQLCHAR k[1000] = {
      " where work_no =  " };
							char d[50];
							printf("请输入想修改密码的工作号:\n");
							scanf("%s", d);
							strcat((char*)k, d);
							char e[50];
							printf("请输入新密码:\n");
							scanf("%s", e);
							strcat((char*)l, e);
							strcat((char*)l, (char*)k);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");
							}
							else {
     
								printf("操作失败\n");
							}
						}break;
						}
					}duankai(); break;
					case 6: {
     lianjie();
						int g;
						printf("请输入想删除信息的表:\n1:图书\n2:工作人员\n3:读者\n");
						scanf("%d", &g);
						switch (g)
						{
     
						case 1: {
     
							SQLCHAR l[1000] = {
      "delete from dbo.book where b_no = " };
							char d[50];
							printf("请输入想删除的图书号:\n");
							scanf("%s", d);
							strcat((char*)l, d);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");
							}
							else
							{
     
								printf("操作失败\n");
							}
						}break;
						case 2: {
     
							SQLCHAR l[1000] = {
      "delete from dbo.workman where work_no = " };
							char d[50];
							printf("请输入想删除的工作证号:\n");
							scanf("%s", d);
							strcat((char*)l, d);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");
							}
							else
							{
     
								printf("操作失败\n");
							}
						}break;
						case 3:
						{
     
							SQLCHAR l[1000] = {
      "delete from dbo.reader where r_no = " };
							char d[50];
							printf("请输入想删除的读者号:\n");
							scanf("%s", d);
							strcat((char*)l, d);
							ret = SQLExecDirect(hstmt, l, SQL_NTS);
							if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
							{
     
								printf("操作成功\n");
							}
							else
							{
     
								printf("操作失败\n");
							}
						}break;
						}
					}duankai(); break;
					default:break;
					}
					}
					break;
				}
			}
		}; break;
	}





	case 2://工作人员登录系统模块
	{
     
		lianjie();
		printf("请输入登录账号：\n");
		scanf("%s", Account);
		printf("请输入登录密码：\n");
		scanf("%s", Password);
		SQLCHAR sql3[] = "use study";
		SQLCHAR sql4[] = "select work_no,pwd from workman";
		ret = SQLExecDirect(hstmt, sql3, SQL_NTS);
		ret = SQLExecDirect(hstmt, sql4, SQL_NTS);
		if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
		{
     
			SQLCHAR str1[50], str2[50];
			SQLINTEGER len_str1, len_str2;
			while (SQLFetch(hstmt) != SQL_NO_DATA)
			{
     
				SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
				SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);

				for (int i = 0; i < 8; i++) {
     
					a[i] = str1[i];
				}
				for (int i = 0; i < 6; i++) {
     
					p[i] = str2[i];
				}
				if (strcmp(Account, a) == 0 && strcmp(Password, p) == 0 || strcmp(Account, a) == 0 && strcmp(Password, p) == 0)
				{
     
					printf("登录成功\n");
					int y;
					duankai();
					printf("请输入:\n1:办理借书\n2:办理还书\n3:罚款\n");
					scanf("%d", &y);
					switch (y)
					{
     
					case 1: {
     
						char w[] = {
      " '," };
						char b[] = {
      " ' " };
						char i[] = {
      ")" };
						SQLCHAR l[1000] = {
      "insert into dbo.borrow(b_no,r_no,[borrow date],[due date])values('" };
						char d[50];
						printf("请输入图书号:\n");
						scanf("%s", d);
						strcat((char*)l, d);
						strcat((char*)l, w);
						char e[50];
						printf("请输入读者证号:\n");
						scanf("%s", e);
						strcat((char*)l, b);
						strcat((char*)l, e);
						strcat((char*)l, w);
						char r[50];
						printf("请输入借书日期:（格式为1900-01-01）\n");
						scanf("%s", r);
						strcat((char*)l, b);
						strcat((char*)l, r);
						strcat((char*)l, w);
						char u[50];
						printf("请输入应还日期:（格式为1900-01-01）\n");
						scanf("%s", u);
						strcat((char*)l, b);
						strcat((char*)l, u);
						strcat((char*)l, b);
						strcat((char*)l, i);
						ret = SQLExecDirect(hstmt, l, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							printf("操作成功\n");

						}
						else {
     
							printf("操作失败\n");
						}
					}break;
					case 2: {
     
						char w[] = {
      " '," };
						char b[] = {
      " ' " };
						char i[] = {
      ")" };
						SQLCHAR l[1000] = {
      "insert into dbo.returnd(b_no,r_no,[return date]) values ('" };
						char d[50];
						printf("请输入图书号:\n");
						scanf("%s", d);
						strcat((char*)l, d);
						strcat((char*)l, w);
						char e[50];
						printf("请输入读者证号:\n");
						scanf("%s", e);
						strcat((char*)l, b);
						strcat((char*)l, e);
						strcat((char*)l, w);
						char u[50];
						printf("请输入归还日期:（格式为1900-01-01）\n");
						scanf("%s", u);
						strcat((char*)l, b);
						strcat((char*)l, u);
						strcat((char*)l, b);
						strcat((char*)l, i);
						ret = SQLExecDirect(hstmt, l, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							printf("操作成功\n");

						}
						else {
     
							printf("操作失败\n");
						}
					}break;
					case 3: {
     
						char w[] = {
      " '," };
						char b[] = {
      " ' " };
						char i[] = {
      ")" };
						SQLCHAR l[1000] = {
      "insert into dbo.fine(b_no,r_no,[fine money]values('','','')" };
						char d[50];
						printf("请输入图书号:\n");
						scanf("%s", d);
						strcat((char*)l, d);
						strcat((char*)l, w);
						char e[50];
						printf("请输入读者证号:\n");
						scanf("%s", e);
						strcat((char*)l, b);
						strcat((char*)l, e);
						strcat((char*)l, w);
						char u[50];
						printf("请输入罚款金额:\n");
						scanf("%s", u);
						strcat((char*)l, b);
						strcat((char*)l, u);
						strcat((char*)l, b);
						strcat((char*)l, i);
						ret = SQLExecDirect(hstmt, l, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							printf("操作成功\n");

						}
						else {
     
							printf("操作失败\n");
						}
					}break;
					default: break;
					}
				}
			}

		}
	}; break;







	case 3://读者登录系统模块
	{
     
		lianjie();
		printf("请输入登录账号：\n");
		scanf("%s", Account);
		printf("请输入登录密码：\n");
		scanf("%s", Password);
		SQLCHAR sql3[] = "use study";
		SQLCHAR sql4[] = "select r_no,pwd from reader";
		ret = SQLExecDirect(hstmt, sql3, SQL_NTS);
		ret = SQLExecDirect(hstmt, sql4, SQL_NTS);
		if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
		{
     
			SQLCHAR str1[50], str2[50];
			SQLINTEGER len_str1, len_str2;
			while (SQLFetch(hstmt) != SQL_NO_DATA)
			{
     
				SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
				SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);

				for (int i = 0; i < 8; i++) {
     
					a[i] = str1[i];
				}
				for (int i = 0; i < 6; i++) {
     
					p[i] = str2[i];
				}
				if (strcmp(Account, a) == 0 && strcmp(Password, p) == 0 || strcmp(Account, a) == 0 && strcmp(Password, p) == 0)
				{
     
					printf("登录成功\n");
					int z;
					duankai();
					printf("请输入:\n1:查询图书信息\n2:查询借书信息\n3:借书\n4:还书\n");
					scanf("%d", &z);
					switch (z)
					{
     
					case 1:
					{
      lianjie();
					SQLCHAR sql1[] = {
      "use study" };
					SQLCHAR sql2[] = {
      "select * from book" };

					ret = SQLExecDirect(hstmt, sql1, SQL_NTS);
					ret = SQLExecDirect(hstmt, sql2, SQL_NTS);
					if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
					{
     
						SQLCHAR str1[50], str2[50], str3[50], str4[50], str5[50];
						SQLINTEGER len_str1, len_str2, len_str3, len_str4, len_str5;
						while (SQLFetch(hstmt) != SQL_NO_DATA)
						{
     
							SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
							SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);
							SQLGetData(hstmt, 3, SQL_C_CHAR, str3, 50, &len_str3);
							SQLGetData(hstmt, 4, SQL_C_CHAR, str4, 50, &len_str4);
							SQLGetData(hstmt, 5, SQL_C_CHAR, str5, 50, &len_str5);
							printf("%s\t%s\t%s\t%s\t%s\t\n", str1, str2, str3, str4, str5);
						}
					}
					};
					duankai();
					break;
					case 2:
					{
      lianjie();
					SQLCHAR sql1[] = {
      "use study" };
					SQLCHAR sql2[] = {
      "select * from borrow" };

					ret = SQLExecDirect(hstmt, sql1, SQL_NTS);
					ret = SQLExecDirect(hstmt, sql2, SQL_NTS);
					if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
					{
     
						SQLCHAR str1[50], str2[50], str3[50];
						SQLINTEGER len_str1, len_str2, len_str3;
						while (SQLFetch(hstmt) != SQL_NO_DATA)
						{
     
							SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 50, &len_str1);   //获取第一列数据
							SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 50, &len_str2);
							SQLGetData(hstmt, 3, SQL_C_CHAR, str3, 50, &len_str3);
							printf("%s\t%s\t%s\t\n", str1, str2, str3);
						}
					}
					};
					duankai();
					break;
					case 3: {
     
						char w[] = {
      " '," };
						char b[] = {
      " ' " };
						char i[] = {
      ")" };
						SQLCHAR l[1000] = {
      "insert into dbo.borrow(b_no,r_no,[borrow date],[due date])values('" };
						char d[50];
						printf("请输入图书号:\n");
						scanf("%s", d);
						strcat((char*)l, d);
						strcat((char*)l, w);
						char e[50];
						printf("请输入读者证号:\n");
						scanf("%s", e);
						strcat((char*)l, b);
						strcat((char*)l, e);
						strcat((char*)l, w);
						char r[50];
						printf("请输入借书日期:（格式为1900-01-01）\n");
						scanf("%s", r);
						strcat((char*)l, b);
						strcat((char*)l, r);
						strcat((char*)l, w);
						char u[50];
						printf("请输入应还日期:（格式为1900-01-01）\n");
						scanf("%s", u);
						strcat((char*)l, b);
						strcat((char*)l, u);
						strcat((char*)l, b);
						strcat((char*)l, i);
						ret = SQLExecDirect(hstmt, l, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							printf("操作成功\n");

						}
						else {
     
							printf("操作失败\n");
						}
					}break;
					case 4: {
     
						char w[] = {
      " '," };
						char b[] = {
      " ' " };
						char i[] = {
      ")" };
						SQLCHAR l[1000] = {
      "insert into dbo.returnd(b_no,r_no,[return date]) values ('" };
						char d[50];
						printf("请输入图书号:\n");
						scanf("%s", d);
						strcat((char*)l, d);
						strcat((char*)l, w);
						char e[50];
						printf("请输入读者证号:\n");
						scanf("%s", e);
						strcat((char*)l, b);
						strcat((char*)l, e);
						strcat((char*)l, w);
						char u[50];
						printf("请输入归还日期:（格式为1900-01-01）\n");
						scanf("%s", u);
						strcat((char*)l, b);
						strcat((char*)l, u);
						strcat((char*)l, b);
						strcat((char*)l, i);
						ret = SQLExecDirect(hstmt, l, SQL_NTS);
						if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)
						{
     
							printf("操作成功\n");

						}
						else {
     
							printf("操作失败\n");
						}
					}break;
					default: break;
					}
				}
			}
		}
	}; break;
	return 0;
	}
}