最近花了不少时间把项目数据库从oracle迁移到达梦8，迁移过程中碰上了不少问题，后面有时间我整理一下心得。
今天先发一下php使用dm_pdo操作达梦数据库的示例代码，里面包括了常规的绑定变量查询，存储过程调用，clob类型操作等。
使用的是达梦提供的pdo_dm驱动，相关配置信息请参考达梦的官方帮助文档（达梦8安装时自带）

ini_set("display_errors","On");
ini_set('log_errors', 1);
ini_set("error_log", "/usr/local/apache2/logs/dm_error.log");

error_reporting(E_ALL)
    
//获取变量值字符串
function strHt($var) 
{
	return print_r($var, true);
}

/*
function xlog(string $lv, string $format, ...$args)
{
    $log = "%s\t%s:%s\t%s" . PHP_EOL;
    $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
    return sprintf($log, $lv, trim($backtrace[0]['file']), $backtrace[0]['line'], sprintf($format, ...$args));
}
echo xlog("info", "我是一条日志%s", ...["呀"]);
————————————————
版权声明：本文为CSDN博主「安木1991」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_42900065/article/details/83509723
*/

function mySubFile($str)
{
	if ($str == "")
	{
		return "";
	}

	return strstr($str, "inc_chk");
}

//日志打印函数
function dbgLogHt(string $format, ...$args)
{
    $log = "%s:%s %s";
    $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
    #$strHt = sprintf($log, '[dbg]',  trim($backtrace[1]['file']), $backtrace[1]['line'], sprintf($format, ...$args));
    #($strHt, 0);
    error_log(sprintf($log, trim($backtrace[0]['file']), $backtrace[0]['line'], sprintf($format, ...$args)));
	//输出调用堆栈 方便调试
    error_log(sprintf("from %s:%s %s:%s %s:%s %s:%s %s:%s %s:%s %s:%s %s:%s" . PHP_EOL,
			mySubFile($backtrace[1]['file']), $backtrace[1]['line'], mySubFile($backtrace[2]['file']), $backtrace[2]['line'],
			mySubFile($backtrace[3]['file']), $backtrace[3]['line'], mySubFile($backtrace[4]['file']), $backtrace[4]['line'],
			mySubFile($backtrace[5]['file']), $backtrace[5]['line'], mySubFile($backtrace[6]['file']), $backtrace[6]['line'],
			mySubFile($backtrace[7]['file']), $backtrace[7]['line'], mySubFile($backtrace[8]['file']), $backtrace[8]['line'])
    );    
    # error_log(strHt($backtrace));

}

function testPdo()
{
	try {
		dbgLogHt("<pre>"); //dm:代表使用达梦pdo驱动
		$pdo = new PDO("dm:host=127.0.0.1", "user_hch", "pass:kingstarer");
		//设置报错方式为抛出异常
		$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);


		$rs = $pdo->query("SELECT * FROM   V\$VERSION WHERE ROWNUM = 1;");

		$rs->setFetchMode(PDO::FETCH_ASSOC);

		$result_arr = $rs->fetchAll();


		error_log(strHt($result_arr));

		$arr = []; //测试绑定变量 包括入参和出参
		$arr[":iCount"] = '5';
		$arr[":rn"] = 'hhc';
		$strSql = "select  :rn rn, table_name from user_tables where rownum < :iCount";
		$stmt = $pdo->prepare($strSql);
		$stmt->bindParam(":rn", $arr[":rn"]);
		$stmt->bindParam(":iCount", $arr[":iCount"]);
		$stmt->execute();
		while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {           // $row是一行，使用while依次输出下一行
			dbgLogHt("while");
			dbgLogHt(strHt($row));
			error_log(strHt($row));
		}
		dbgLogHt("<pre>");

        // 测试存储过程调用 
		$strSql = "begin  :ret := f_prod_demo(:num, 'UPD', 123, :o_err_code, :o_err_msg, :o_call_stack); end;";
		$stmt = $pdo->prepare($strSql);

		/*
		//用这种 比较简洁 但实际测试发现不行
		$arr = [];
		$arr[':num'] = '123';
		$arr[':ret'] = 'o_err_code';
		$arr[':o_err_code'] = 'o_err_code';
		$arr[':o_err_msg'] = 'o_err_msg';
		$arr[':o_err_msg'] = 'o_call_stack';
		$stmt->execute($arr);
		print_r($arr);
		*/

		$arr = [];
		$arr[':num'] = '123';
		$arr[':ret'] = 'o_err_code';
		$arr[':o_err_code'] = 'o_err_code';
		$arr[':o_err_msg'] = 'o_err_msg';
		$arr[':o_err_msg'] = 'o_call_stack';
		$stmt->bindParam(':num', $arr[':num']);
		$stmt->bindParam(':ret', $arr[':ret']);
		$stmt->bindParam(':o_err_code', $arr[':o_err_code']);
		$stmt->bindParam(':o_err_msg', $arr[':o_err_msg']);
		$stmt->bindParam(':o_call_stack', $arr[':o_call_stack']);
		$stmt->execute();
		error_log(strHt($arr));
		$stmt->closeCursor();

		//测试达梦插入clob数据
		$strSql = "INSERT into HCH_TEST values(1, '333')";
		$stmt = $pdo->prepare($strSql);
		$stmt->execute();
		error_log("insert clob ok");
		$stmt->closeCursor();

		//测试使用绑定变量插入clob类型数据
		$strSql = "INSERT into HCH_TEST values(:id, :mess)";
		error_log("<prepare>");
		$stmt = $pdo->prepare($strSql);
		error_log("<prepare ok>");
		$arr[':id'] = "123";
		$stmt->bindParam(':id', $arr[':id']);
		error_log("<bindParam ok>");
		$arr[':mess'] = "123";
		$stmt->bindParam(':mess', $arr[':mess']);
		error_log("<bindParam ok>");

		$stmt->execute();
		error_log("<execute ok>");
		$stmt->closeCursor();
		error_log("insert clob param ok");

		error_log("<pre>");

		$pdo = null;
		//更多达梦数据库开发经验请参考： https://www.cnblogs.com/kingstarer/
	} catch (PDOException $e) {
		error_log("Error: " . $e->getMessage());
		error_log("<pre>");
		//die();
	}

	//exit(1);
}

网上关于达梦的资料比较少，希望这篇心得能起抛砖引玉的效果。