Visual Studio2022连接SQL Server数据库的详细图文教程

CREATE DATABASE [Test] ON  PRIMARY 
( NAME = N'Test', FILENAME = N'D:\Program Files (x86)\Microsoft SQL Server\mssql10_50.SQLEXPRESS\MSSQL\DATA\Test.mdf' , SIZE = 3072KB , FILEGROWTH = 1024KB )
 LOG ON 
( NAME = N'Test_log', FILENAME = N'D:\Program Files (x86)\Microsoft SQL Server\MSSQL10_50.SQLEXPRESS\MSSQL\DATA\Test_log.ldf' , SIZE = 1024KB , FILEGROWTH = 10%)
GO
use Test
go
create table baseInfor(no int, name char(20), passWord char(10), other  char(20))
go
insert into baseInfor values(1001, '学生1', '1001', '计算机科学与技术'),
				            (1001, '老师1', '1001', '讲师'),
				            (2001, '管理员', '2001', '管理员')
go

#include<stdio.h>
#include<string.h>
#include<Windows.h>
#include<sql.h>
#include<sqlext.h>
#include<sqltypes.h>
SQLRETURN ret;
SQLHENV henv;
SQLHDBC hdbc;
SQLHSTMT hstmt;
void Connect() {
	ret = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
	ret = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, SQL_IS_INTEGER);
	ret = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
	ret = SQLConnect(hdbc, (unsigned char*)"Test", SQL_NTS, (unsigned char*)"sa", SQL_NTS, (unsigned char*)"", SQL_NTS);
	if (!(ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO)) {
		printf("连接数据库失败!\n");
		return;
	}
	ret = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
}
void free() {
	SQLDisconnect(hdbc);
	SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
	SQLFreeHandle(SQL_HANDLE_ENV, henv);
}
void showStu() {
	Connect();
	SQLPrepare(hstmt, (SQLCHAR*)("select * from Test.dbo.baseInfor"), SQL_NTS);
	ret = SQLExecute(hstmt);
	if (ret == SQL_SUCCESS || ret == SQL_SUCCESS_WITH_INFO) {
		SQLCHAR str1[20], str2[20], str3[20], str4[20];
		SQLLEN len_str1, len_str2, len_str3, len_str4;
		while (SQLFetch(hstmt) != SQL_NO_DATA) {
			SQLGetData(hstmt, 1, SQL_C_CHAR, str1, 20, &len_str1);
			SQLGetData(hstmt, 2, SQL_C_CHAR, str2, 20, &len_str2);
			SQLGetData(hstmt, 3, SQL_C_CHAR, str3, 20, &len_str3);
			SQLGetData(hstmt, 4, SQL_C_CHAR, str4, 20, &len_str4);
			printf("%s\t%s\t%s\t%s\n", str1, str2, str3, str4);
		}
	}
	free();
}
int main() {
	showStu();
	return 0;
}