Question

我正在尝试从存储过程中检索OUT参数，但出现异常。从MySQL Workbench控制台执行时，存储过程可以正常工作。

这是演示程序。在我的原始过程中，我将记录插入表中，并检索SQL状态（字符（5））以检查记录是否已成功插入。

环境

nanodbc version: 2.13.0
DBMS name/version: MySQL 5.7
OS and Compiler: Windows 10 Professional 64-bits, Visual C++ 15.9.11
CMake settings:

例外

[2019-04-22 12:26:24.091] [error] d:\libraries\nanodbc\nanodbc\nanodbc.cpp:1683: HY00: [MySQL][ODBC 8.0(a) Driver][mysqld-5.7.25-log]OUT or INOUT argument 1 for routine seimens_plc.test_procedure is not a variable or NEW pseudo-variable in BEFORE trigger

最小工作示例

#include "pch.h"
#include <array>
#include <iostream>
#include <nanodbc/nanodbc.h>
#include <spdlog/spdlog.h>

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

int main()
{
    try 
       {
        int result;
        nanodbc::string dns = "PLC_Interface";
        nanodbc::string user_name = "root";
        nanodbc::string password = "tantra";
        nanodbc::connection conn(dns, user_name, password);
        nanodbc::statement stmt;
        stmt.prepare(conn, "{CALL test_procedure(?);}");
        stmt.bind(0, &result, nanodbc::statement::PARAM_OUT);
        stmt.execute();
        std::cout << result;
        conn.disconnect();
    }
    catch (const std::exception& ex)
    {
        spdlog::error(ex.what());
    }
}

存储过程

DROP procedure IF EXISTS `test_procedure`;

DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `test_procedure`(OUT a INT)
BEGIN
    set a = 10;
END$$

DELIMITER ;

存储过程：尝试在nanodbc

0 个答案: