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PODynamically chose a field in a table to update
 

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  1. PODynamically chose a field in a table to update
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    <p>How can you write an update statement to update a table in a database with the field being different for each update? and using Linq to SQL. Having searched StackOverFlow and google I find everything related to dynamic select statements, which I am not needing.</p> <p>some information to help:</p> <p>I have a table named Persons with typical fields: FirstName, LastName, Phone, Address, City, State, etc.</p> <p>I currently do separate functions to perform an update to FirstName, next one to LastName, etc. I would like to combine these into 1 function that can update the given field to the given value and I am using Linq to Sql.</p> <p>Let me know if this is still clear as mud.</p> <p>Mud clearing up per comments: to clarify I am using Linq to Sql.</p> <p>Code information:</p> <pre><code>bool UpdatePersonFirstName(string FirstName, Int PersonId) { bool _wasUpdated = false; if (PersonId == 0) throw new ArguementMissingException(); using (CustomerModelDataContext proxy = new CustomerModelDataContext()) { try { var _result = proxy.Persons.SingleOrDefault(_per =&gt; _per.PersonId = PersonId) _result.FirstName = FirstName; proxy.SubmitChanges(); _isUpdated = true; } catch (exception ex) { throw ex; } } return _isUpdated; } bool UpdatePersonAddress(string AddressInfo, Int PersonId) { bool _wasUpdated = false; if (PersonId == 0) throw new ArguementMissingException(); using (CustomerModelDataContext proxy = new CustomerModelDataContext()) { try { var _result = proxy.Persons.SingleOrDefault(_per =&gt; _per.PersonId = PersonId) _result.Address = AddressInfo; proxy.SubmitChanges(); _isUpdated = true; } catch (exception ex) { throw ex; } } return _isUpdated; } </code></pre> <p>repeating the above for each updatable field in the Persons table.</p> <p>I would like to accomplish the following:</p> <pre><code>void UpdatePersonTable(string FieldName, string FieldValue, int PersonId) { ... var _result = Proxy.Persons.SingleOrDefault(_per =&gt; _per.PersonId = PersonId); _result.[Field matching FieldName] = FieldValue; Proxy.SubmitChanges(); ... } </code></pre> <p>to recap, i would like 1 method that will do the update based on passing in the field name and value vice having to make multiple update statements.</p> <p><strong>EDIT:</strong> Code updated to provide more of the functions methods. Proxy is just a name for the Model Data Context, as mentioned previously this is using Linq to Sql connections.</p>
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    1. USScott Chamberlain
    1. USConsulting Mechanic
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    1. COIt will be clear us mud until you'll present your problem in a form of a concise code example :)
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      1. USBartoszKP
    2. COCan you show where you declare Proxy? I'm using an ObjectSet in my examples I have at hand, so the syntax might differ.
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      1. PODynamically chose a field in a table to update
      1. USFrancis Ducharme
    3. COin your code you declare a `_wasUpdated` but never use it and set and return a `_isUpdated`. Also I don't understand why you are even returning a `bool` because there is no code path where it could return false. Lastly, [never do `throw ex;`](http://stackoverflow.com/questions/730250/is-there-a-difference-between-throw-and-throw-ex) only do `throw;` or `throw new MoreSpcificExecption("Some Details", ex);`
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      1. USScott Chamberlain
 

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