使用正则表达式解析 tnsnames.ora

Question

我正在尝试使用正则表达式从我的 tnsnames 文件中提取一些信息。我从以下模式开始：

MYSCHEMA *? = *?[\W\w\S\s]*\(主机 *?= *?(?<主机>\w+\s?)\)\s?\(端口 *?= *?(?< ;port>\d+)\s?\)[\W\w\S\s]*\(SERVICE_NAME *?= *?(?\w+)\s?\)

有效当 MYSCHEMA 是文件中唯一的模式时没问题，但是当 MYSCHEMA 之后列出了其他模式时，它会一直匹配到最后一个模式。

此后，我创建了一个新模式：

MYSCHEMA *=\s*\(DESCRIPTION =\s*\(ADDRESS *= *\(PROTOCOL *= *TCP\)\(HOST *= *(?;\w+)\)\(端口 *= *(?<端口>\d+)\)\)\s*\(CONNECT_DATA *=\s*(?<服务器专用>\(服务器 *= *专用\ ))\s*\(SERVICE_NAME *= *(?[\w\.]+) *\)\s*\)\s*\)

此模式仅与 MYSCHEMA 匹配，但我必须添加出现在 MYSCHEMA 条目中的每个元素，如果它不包含所有相同的元素，它将与 MYOTHERSCHEMA 不匹配。

理想情况下，我想要一个仅与 MYSCHEMA 条目匹配的模式，并捕获主机、端口和服务名称，以及可选的 (SERVER = DEDICATED)（我在第一个模式中没有）到命名组。

以下是我用于测试的示例 tnsnames：

SOMESCHEMA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
    )
    (CONNECT_DATA = (SERVICE_NAME = REMOTE)
    )
  )

MYSCHEMA =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = MYSERVICE.LOCAL )
    )
  )

MYOTHERSCHEMA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
    )
    (CONNECT_DATA = 
      (SERVICE_NAME = MYSERVICE.REMOTE)
    )

  )

SOMEOTHERSCHEMA = 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = LOCALHOST)(PORT = 1234))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = LOCAL)
    )
  )

Answer 1

使用平衡组应该可以做到这一点。并根据您的需要修改开关/外壳。

class TnsRegex
{
    public void Test()
    {
        Regex reTns = new Regex(_pattern, RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
        MatchCollection matchCollection = reTns.Matches(_text);

        foreach (Match match in matchCollection)
        {
            foreach (Capture capture in match.Groups["Settings"].Captures)
            {
                string[] setting = capture.Value.Split(new[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
                string key = setting[0].Trim();
                string val = setting[1].Trim();
                if (val.Contains("(")) continue;
                switch (key)
                {
                    case "HOST":
                        break;
                    case "PORT":
                        break;
                    case "SERVICE_NAME":
                        break;
                    case "SERVER":
                        break;
                }
                Console.WriteLine(key + ":" + val);
            }
        }
    }
    string _pattern = @"
        MYSCHEMA\s+=\s+\(
        [^\(\)]*
        (
                    (
                                (?<Open>\()
                                [^\(\)]*
                    )+
                    (
                                (?<Settings-Open>\))
                                [^\(\)]*
                    )+
        )*
        (?(Open)(?!))
    \)";

    string _text = @"
    MYSCHEMA =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
        (CONNECT_DATA =
          (SERVER = DEDICATED)
          (SERVICE_NAME = MYSERVICE.LOCAL )
        )
      )

    SOMESCHEMA =
      (DESCRIPTION =
        (ADDRESS_LIST =
          (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
        )
        (CONNECT_DATA = (SERVICE_NAME = REMOTE)
        )
      )
    ";
}

Answer 2

以下正则表达式将解析出各个 TNS 条目，您所要做的就是按照您认为适合名称/值的方式解析每个结果

([\w-]+)\s*=(?:\s| .)+?\)\s*\)\s*\)\s*(?=[\w\-])

示例：https://regexr.com/3r2vn

Answer 3

好吧，由于我还没有找到这个问题的令人信服的答案（无意冒犯@Mikael Svenson），所以我只是坚持问题中列出的第二种模式。暂时就足够了，因为 tnsnames.ora 文件始终遵循我们组织内的确切模式。如果 tnsnames.ora 文件格式发生变化，我很可能会采用解析器。

Answer 4

该表达式使用 address_list 上的一个地址解析架构，等等。
希望这有帮助。

--开始
(?>((?[\n][\s][^(][\w_.]+)[\s]=[\s]))(? >(?[\n\s(]描述[\s=\s](?>(?[\n\s(]*ADDRESS_LIST[\s=\s]*[ \n\s(]地址[\s=\s](?([\n\s(]COMMUNITY)([\n\s(]COMMUNITY[\s=\s]< em>(?[\w.)]+))|())[\s\n](?([\n\s(]协议)([\n\s(]协议[\ s=\s](?[\w.)]+))|())[\s\n](?([\n\s(]HOST)([\n\ s(]HOST[\s=\s](?[\w.)]+))|())[\s\n](?([\n\s(]PORT) )([\n\s(]PORT[\s=\s](?[\w.)]+))|())[\s\n](?()) ())|())))[\s\n](?>(?[\n][\s][(]CONNECT_DATA\s*[=]\s*[ \n](?([(]SID\s[=]\s*)(([(]SID\s*[=]\s*(?[\w.]+) \s*[)]))|())[\s\n](?([(]SERVER\s[=]\s*)(([(]SERVER\s* [=]\s*(?[\w.]+)\s*[)]))|())[\s\n]*(?([(]SERVICE_NAME\s*[=]\s* )(([(]SERVICE_NAME\s*[=]\s*(?[\w.]+)\s*[)]))|())[\s\n](?() )())|())))[\s\n](?())())|())))
*--end

毫无疑问，问题在于写入该文件的形式的倍数。正如您所说的文件必须是唯一的，这是通过使用 TNS_ADMIN 变量来解决的。

Answer 5

我尝试了上面的答案，但没有一个对我有用......

    [DebuggerDisplay("Name {Name} Host:{Host} ServiceName:{ServiceName} Port:{Port}")]
    public class TnsEntry
    {
        public string Name { get; set; }
        public string Host { get; set; }
        public string Port { get; set; }
        public string ServiceName { get; set; }
    }


   public class TnsNamesFileParser
   {
    public string TNSNamesContents { get; set; }

    public TnsNamesFileParser()
    {
    }

    public TnsNamesFileParser(string locationAndNameOfTnsNamesFile)
    {
        TNSNamesContents = System.IO.File.ReadAllText(locationAndNameOfTnsNamesFile);
    }

    public List<TnsEntry> Parse()
    {
        return Parse(TNSNamesContents);
    }

    public List<TnsEntry> Parse(string TNSNamesContents)
    {
        string TNSPattern = @"([\w -] +)\s *= (?:\s |.) +?\)\s *\)\s *\)\s * ((?=[\w\-])|(?=$))";

        Regex reTns = new Regex(TNSPattern, RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
        MatchCollection matchCollection = reTns.Matches(TNSNamesContents);

        var TnsEntries = new List<TnsEntry>();

        foreach (Match match in matchCollection)
        {
            var tnsEntry = new TnsEntry();
            string matchedValue = match.Value.Trim();

            tnsEntry.Name = Regex.Match(matchedValue, @"^([^\s]+)", RegexOptions.IgnoreCase)?.Value.Trim();
            tnsEntry.Host = Regex.Match(matchedValue, "(?<=HOST.+=) ([^)]*)", RegexOptions.IgnoreCase)?.Value.Trim();
            tnsEntry.Port = Regex.Match(matchedValue, "(?<=PORT.+=) ([^)]*)", RegexOptions.IgnoreCase)?.Value.Trim();
            tnsEntry.ServiceName = Regex.Match(matchedValue, "(?<=SERVICE_NAME.+=) ([^)]*)", RegexOptions.IgnoreCase)?.Value;

            TnsEntries.Add(tnsEntry);

        }

        return TnsEntries;
    }
  }

//Test Code: 

string testdata =@"
        SOMESCHEMA =
        (DESCRIPTION =
        (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
        )
        (CONNECT_DATA = (SERVICE_NAME = REMOTE)
        )
        )

        MYSCHEMA =
        (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
        (CONNECT_DATA =
        (SERVER = DEDICATED)
        (SERVICE_NAME = MYSERVICE.LOCAL )
        )
        )

        MYOTHERSCHEMA =
        (DESCRIPTION =
        (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
        )
        (CONNECT_DATA = 
        (SERVICE_NAME = MYSERVICE.REMOTE)
        )
        )

        SOMEOTHERSCHEMA = 
        (DESCRIPTION =
        (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = LOCALHOST)(PORT = 1234))
        )
        (CONNECT_DATA =
        (SERVICE_NAME = LOCAL)
        )
        )";
 [Test]
 public void ParseTNSFileEntries()
 {

  var tnsNamesFileParser = new TnsNamesFileParser();
  var entries =  tnsNamesFileParser.Parse(testdata);


 }