How Can I Parse SQL Code in C# Using Microsoft.SqlServer.Management.SqlParser?

Use Microsoft.SqlServer.Management.SqlParser to parse SQL code in C#

In C#, parsing SQL code is a critical task in various applications and tools. This process involves breaking down code into its component parts, creating a structured representation that can be analyzed and manipulated.

Microsoft.SqlServer.Management.SqlParser

For Transact-SQL (Microsoft SQL Server), the preferred solution is the Microsoft.SqlServer.Management.SqlParser.Parser namespace. This namespace provides a comprehensive parser that converts SQL code into a sequence of tokens. Tags represent the smallest unit of meaning in a code.

Parse example

The following example demonstrates how to parse T-SQL code as a string into a sequence of tokens:

<code class="language-csharp">IEnumerable<TokenInfo> ParseSql(string sql)
{
    ParseOptions parseOptions = new ParseOptions();
    Scanner scanner = new Scanner(parseOptions);

    int state = 0,
        start,
        end,
        lastTokenEnd = -1,
        token;

    bool isPairMatch, isExecAutoParamHelp;

    List<TokenInfo> tokens = new List<TokenInfo>();

    scanner.SetSource(sql, 0);

    while ((token = scanner.GetNext(ref state, out start, out end, out isPairMatch, out isExecAutoParamHelp)) != (int)Tokens.EOF)
    {
        TokenInfo tokenInfo = new TokenInfo
        {
            Start = start,
            End = end,
            IsPairMatch = isPairMatch,
            IsExecAutoParamHelp = isExecAutoParamHelp,
            Sql = sql.Substring(start, end - start + 1),
            Token = (Tokens)token
        };

        tokens.Add(tokenInfo);

        lastTokenEnd = end;
    }

    return tokens;
}</code>

The

TokenInfo class represents each token, including information such as its starting and ending positions, pairing status, and corresponding SQL text.

Node type

The parser classifies tokens into various types, represented by the Tokens enumeration. These types include keywords, identifiers, punctuation, and more. By analyzing the sequence of tags, you can identify the types of nodes in your code, such as SELECT statements, JOIN conditions, and loop structures.

Summary

Microsoft.SqlServer.Management.SqlParser provides a powerful tool for parsing SQL code in C#. Developers can leverage this parser to create applications that efficiently analyze, manipulate, and optimize SQL queries.

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