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

Parse SQL code using C#

This article describes how to use the Microsoft.SqlServer.Management.SqlParser.Parser namespace to parse SQL code in C#. This namespace is included in the Microsoft.SqlServer.Management.SqlParser.dll assembly, which ships with SQL Server and can be freely distributed.

The

SqlServer.Management.SqlParser.Parser namespace provides functionality to parse Transact-SQL (T-SQL) statements and generate a sequence of tokens that represent the structure of each statement. The following example method demonstrates the parsing process:

<code class="language-csharp">public static 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>

In this example, the TokenInfo class is a simple class that contains properties for the token information. Tokens is an enumeration (Microsoft.SqlServer.Management.SqlParser.Parser.Tokens) that defines constants like TOKEN_BEGIN, TOKEN_COMMIT and TOKEN_EXISTS.

Please note that the Microsoft.SqlServer.Management.SqlParser assembly is now available as a separate NuGet package: https://www.php.cn/link/e6e8bbe351bf19f963820a96543f25db.

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