将T-SQL语句解析为令牌 [英] Parsing T-SQL statements to tokens

问题描述

您可以在此处看到C#代码语句的效果如何解析为令牌.例如，以下代码:

You can see here how nicely C#code statement is parse to tokens. For example, the following code:

namespace MyNamespace
{
    class MyClass
    {
        public void MyFunction(int arg1)
        {
            int var1 = arg1;
        }
    }
}

对此进行了解析:

我想做这样的事情，但是要用T-SQL语句.例如，如果我有以下T-SQL语句:

I want to do something like this but with T-SQL statement instead. For example, if I have the following T-SQL statement:

IIF(COALESCE([Col001], [Col002], [Col003]) > [Col004], [Col005] * [Col006] + ISNULL([Col007], [Col008]), CONCAT(SUBSTRING([Col009], 0, 3), 'sample text', [Col010]))

会给我这样的东西:

IIF, COALESCE, ISNULL, CONCAT, SUBSTRING    - functions 
[Col001], [Col002], ... , [Col010]          - columns 
0, 3, 'sample text'                         - variables

或者如果我有:

ISNULL([Col001], [Col002], [Col003])

结构错误:

[The isnull function requires 2 argument(s).] - error

没有任何免费或付费的最新解决方案，并且似乎使用Microsoft解析器是此处的最佳解决方案.如我所读，我需要使用 Microsoft. SqlServer.Management.SqlParser.Parser 命名空间，但是没有任何示例，我无法按照自己喜欢的方式拆分T-SQL语句.另外，它似乎仅适用于完整的语句(例如，您需要SELECT子句，而我仅需要将其用于代码片段).

There are not any free or paid up-to-date solutions and it seems to use the Microsoft parser is the best solution here. As I have read I need to use the Microsoft.SqlServer.Management.SqlParser.Parser namespace, but there are not any examples and I was not able to split the T-SQL statement the way I like. Also, it seems to work only with complete statements (you need SELECT clause for example, and I need to use it for code fragments only).

我可以使用此名称空间来执行此操作吗?还是开始为自己的需要编写C#类?

Can I do this using this namespace or it's better to start writing C# class for my needs instead?

推荐答案

我必须在csproj中手动添加引用

I had to add the reference manually in the csproj

Microsoft.SqlServer.Management.SqlParser，版本= 12.0.0.0，区域性=中性，PublicKeyToken = 89845dcd8080cc91

Microsoft.SqlServer.Management.SqlParser, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91

喜欢

<Reference Include="Microsoft.SqlServer.Management.SqlParser, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

一个简单的例子:

string sql = "IIF(COALESCE([Col001], [Col002], [Col003]) > [Col004], [Col005] * [Col006] + ISNULL([Col007], [Col008]), CONCAT(SUBSTRING([Col009], 0, 3), 'sample text', [Col010]))";

var po = new ParseOptions { };
var scanner = new Scanner(po);
scanner.SetSource(sql, 0);

Tokens token;
int state = 0;
int start;
int end;
bool isPairMatch;
bool isExecAutoParamHelp;

while ((token = (Tokens)scanner.GetNext(ref state, out start, out end, out isPairMatch, out isExecAutoParamHelp)) != Tokens.EOF)
{
    string str = sql.Substring(start, end - start + 1);
    Console.WriteLine("{0}: {1}", token, str);
}

来自来自解析T -SQL –简单的方法

请注意，此解析器可识别一定数量的功能(如IIF，COALESCE，...).无法识别的功能仅标记为TOKEN_ID，例如列名.

Note that this parser recognizes a certain number of functions (like IIF, COALESCE, ...). Unrecognized functions are simply marked as TOKEN_ID, like column names.

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