如何在C++代码中连接sql server数据库？

#include <windows.h>
#include <sql.h>
#include <sqlext.h>

#pragma comment(lib, "odbc32.lib")

SQLHENV hEnv; // 环境句柄
SQLRETURN ret;

ret = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &hEnv);
if (ret != SQL_SUCCESS && ret != SQL_SUCCESS_WITH_INFO) {
    // 处理错误
    // ...
}
ret = SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_INTEGER);
if (ret != SQL_SUCCESS && ret != SQL_SUCCESS_WITH_INFO) {
    // 处理错误
    // ...
}

SQLHDBC hConn; // 连接句柄

ret = SQLAllocHandle(SQL_HANDLE_DBC, hEnv, &hConn);
if (ret != SQL_SUCCESS && ret != SQL_SUCCESS_WITH_INFO) {
    // 处理错误
    // ...
}
ret = SQLConnect(hConn, (SQLCHAR*)"your_server_name", SQL_NTS, (SQLCHAR*)"your_username", SQL_NTS, (SQLCHAR*)"your_password", SQL_NTS);
if (ret != SQL_SUCCESS && ret != SQL_SUCCESS_WITH_INFO) {
    // 处理错误
    // ...
}

SQLHSTMT hStmt; // 语句句柄

ret = SQLAllocHandle(SQL_HANDLE_STMT, hConn, &hStmt);
if (ret != SQL_SUCCESS && ret != SQL_SUCCESS_WITH_INFO) {
    // 处理错误
    // ...
}
ret = SQLExecDirect(hStmt, (SQLCHAR*)"your_sql_statement", SQL_NTS);
if (ret != SQL_SUCCESS && ret != SQL_SUCCESS_WITH_INFO) {
    // 处理错误
    // ...
}

SQLFreeHandle(SQL_HANDLE_STMT, hStmt);
SQLDisconnect(hConn);
SQLFreeHandle(SQL_HANDLE_DBC, hConn);
SQLFreeHandle(SQL_HANDLE_ENV, hEnv);