LINQed IN

Blog by Troy Magennis on Software Architecture, Development and Management

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Troy Magennis is a software developer living in Seattle, WA. Troy is a Microsoft MVP, the author of many articles, and the founder of HookedOnLINQ.com, a LINQ specific wiki reference site.
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    The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway.

    © Copyright 2014

    Determining SQL Server Object Dependencies for a Stored Procedure or Other Database Object Name

    Finding what dependencies a Stored Procedure has on underlying tables, views, functions, etc is often necessary when trying to assess the impact of a change. SQL Server has built-in functions that will indicate in most cases a dependency for any object in the database. The system view "sys.sql_dependencies" is viewed with skepticism by some people who have obviously been bitten in the past.

    In order to see for myself the results, I wrote a simple helper class, and thought i'd share the boilerplate code to start you off here (I may clean it up and share it as a library, email me if you have difficulty getting it running). Its a rough prototype, but it is returning good results for my purposes.

    Note: This code requires Visual Studio 2008. It uses LINQ to SQL in a very loose way due to the LINQ to SQL Designer not listing the System Views and Functions. Its a good example of just how flexible LINQ to SQL is though.

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Data.Linq;
    using System.Configuration;
    
    namespace DatabaseDependencyCrawler
    {
        public class SysDependsResult
        {
            public int referenced_major_id { get; set; }
        }
    
        public class ObjectInfoResult
        {
            public int id { get; set; }
            public string name { get; set; }
            public string xtype  { get; set; }
            public DateTime crdate { get; set; }
        }
    
        public class DatabaseDependencyCrawler
        {
            public List<DatabaseDependencyEntity> GetDBObjectDependencies(string connectionString, string name)
            {
                // the system views built-into SQL Server 2005
                string dependsQuery = "select referenced_major_id from sys.sql_dependencies where object_id = object_id('{0}')";
                string objectInfoQuery = "select * from sys.sysobjects where id in ( {0} )";
    
                List<DatabaseDependencyEntity> result = new List<DatabaseDependencyEntity>();
    
                // find the list of dependencies based upon a database object's name
                DataContext context = new DataContext(connectionString);
    
                var dependencies = (IEnumerable<dependencies>)context.ExecuteQuery(
                    typeof(SysDependsResult),
                    string.Format(dependsQuery, name), 
                    new object[] { });
    
                // build a list of object_is's to we can ask for their name in a second query
                StringBuilder ids = new StringBuilder();
                foreach (SysDependsResult d in dependencies)
                {
                    if (ids.Length > 0)
                         ids.Append(",");
    
                    ids.Append(d.referenced_major_id);
                }
    
                // if any records were found...lookup the names of those id's comma separated
                if (ids.Length > 0)
                {
    
                    IEnumerable<ObjectInfoResult> objects = (IEnumerable<ObjectInfoResult>)context.ExecuteQuery(typeof(ObjectInfoResult),
                        string.Format(objectInfoQuery, ids.ToString()),
                        new object[] { });
    
                    foreach (ObjectInfoResult o in objects)
                    {
                        result.Add (
                            new DatabaseDependencyEntity {
                                DatabaseConnectionString = connectionString,
                                SourceObject = name,
                                Dependent = o
                            });
                    }
                }
            
                return result;
            }
        }
    }

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    1. is the abortion pill painful
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    Categories: C# | LINQ | Resources
    Posted by newuser09876 on Tuesday, July 15, 2008 5:34 AM
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