SQL Eval Function A SQL Eval function to execute C# directly in T-SQL

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-- Evaluate dynamically expression in T-SQL
DECLARE @tableFormula TABLE (
   Formula VARCHAR(255), X INT, Y INT, Z INT
)

INSERT INTO @tableFormula VALUES ('x+y*z', 1, 2, 3 ), 
                                ('(x+y)*z', 1, 2, 3 )
-- SELECT 7
-- SELECT 9
SELECT SQLNET::New(Formula)
              .ValueInt('x', X)
              .ValueInt('y', Y)
              .ValueInt('z', Z).EvalInt() as Result
FROM @tableFormula



What's Eval-SQL.NET?

SQL Eval Function is a C# expression evaluator. You can evaluate arithmetic expressions, regex, and more directly in T-SQL.


Do you offer consulting services?

Yes, you can contact us for special requests: info@zzzprojects.com


Where can I find online examples?

A lot of examples will be soon available on .NET Fiddle. This feature is under development by our company (ZZZ Projects).

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Evaluate dynamic arithmetic expression in SQL

Make the impossible now possible. Evaluate C# expression in SQL to overcome limitations.

  • Allow trusted users to create report field and filter
  • Consume Web Service
  • Replace text in template with String Interpolation
  Read More
SQL Eval - Dynamic Expression Example
-- Easy to use

-- CREATE test
DECLARE @table TABLE ( X INT, Y INT, Z INT )
INSERT  INTO @table VALUES  ( 2, 4, 6 ),  ( 3, 5, 7 ), ( 4, 6, 8 )

-- Result: 14, 22, 32
DECLARE @sqlnet SQLNET = SQLNET::New('x*y+z')
SELECT  @sqlnet.ValueInt('x', X)
               .ValueInt('y', Y)
               .ValueInt('z', Z)
               .EvalInt() as Result
FROM    @table

Split text with delimiter

Improve performance and capability for splitting text with an easy to use split function and LINQ expressions.

  • Split text with multiple delimiters
  • Split text using a regular expression
  • Include row index
  Read More
SQL Eval - Split Text Example
-- CREATE test
DECLARE @t TABLE (Id INT , Input VARCHAR(MAX))
INSERT  INTO @t VALUES  ( 1, '1, 2, 3; 4; 5' ), ( 2, '6;7,8;9,10' )

-- SPLIT with many delimiters: ',' and ';'
DECLARE @sqlnet SQLNET = SQLNET::New('Regex.Split(input, ",|;")')

SELECT  *
FROM    @t AS A
        CROSS APPLY ( SELECT    *
                      FROM      dbo.SQLNET_EvalTVF_1(@sqlnet.ValueString('input', Input))
                    ) AS B

Use regular expression in SQL Server

Use Regex flexibility to overcome "LIKE" and "PATHINDEX" limitations.

  • IsMatch
  • Match
  • Matches
  • Replace
  • Split
  Read More
SQL Eval - Regular Expression Example
DECLARE @customer TABLE ( Email VARCHAR(255) )

INSERT  INTO @customer
VALUES  ( 'info@zzzprojects.com' ),
        ( 'invalid.com' ),
        ( 'sales@zzzprojects.com' )

DECLARE @valid_email SQLNET = SQLNET::New('Regex.IsMatch(email, 
@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$")')

-- SELECT 'invalid.com'
SELECT * FROM @customer WHERE @valid_email.ValueString('email', Email).EvalBit() = 0

Replace xp_cmdshell with restrictive alternative

Avoid enabling xp_cmdshell and compromising your SQL Server and use instead a more restrictive solution.

  • Impersonate Context
  • Improve maintainability
  • Improve readability
  • Improve security
  Read More
SQL Eval - IO Example
-- REQUIRE EXTERNAL_ACCESS permission
DECLARE @sqlnet SQLNET = SQLNET::New('
string path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

var dir = new DirectoryInfo(path);
return dir.GetFiles("*.*")
          .Select(x => new { x.FullName, FileContent = File.ReadAllText(x.FullName) })
          .OrderBy(x => x.FullName)')
          .Impersonate()

-- SELECT FullName, FileContext FROM DesktopFiles ORDER BY Fullname
EXEC dbo.SQLNET_EvalResultSet @sqlnet