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  1. PO
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    <p>The way that i used to solve this problem was a table 'Sequences' that stores all my sequences and a 'nextval' stored procedure. </p> <p>Sql Table: </p> <pre><code>CREATE TABLE Sequences ( name VARCHAR(30) NOT NULL, value BIGINT DEFAULT 0 NOT NULL, CONSTRAINT PK_Sequences PRIMARY KEY (name) ); </code></pre> <p>The <strong>PK_Sequences</strong> is used just to be sure that there will never be sequences with the same name. </p> <p>Sql Stored Procedure: </p> <pre><code>IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'nextVal') AND type in (N'P', N'PC')) DROP PROCEDURE nextVal; GO CREATE PROCEDURE nextval @name VARCHAR(30) AS BEGIN DECLARE @value BIGINT BEGIN TRANSACTION UPDATE Sequences SET @value=value=value + 1 WHERE name = @name; -- SELECT @value=value FROM Sequences WHERE name=@name COMMIT TRANSACTION SELECT @value AS nextval END; </code></pre> <p>Insert some sequences: </p> <pre><code>INSERT INTO Sequences(name, value) VALUES ('SEQ_Workshop', 0); INSERT INTO Sequences(name, value) VALUES ('SEQ_Participant', 0); INSERT INTO Sequences(name, value) VALUES ('SEQ_Invoice', 0); </code></pre> <p>Finally get next value of a sequence, </p> <pre><code>execute nextval 'SEQ_Participant'; </code></pre> <p>Some c# code to get the next value from Sequence table, </p> <pre><code>public long getNextVal() { long nextval = -1; SqlConnection connection = new SqlConnection("your connection string"); try { //Connect and execute the select sql command. connection.Open(); SqlCommand command = new SqlCommand("nextval", connection); command.CommandType = CommandType.StoredProcedure; command.Parameters.Add("@name", SqlDbType.NVarChar).Value = "SEQ_Participant"; nextval = Int64.Parse(command.ExecuteScalar().ToString()); command.Dispose(); } catch (Exception) { } finally { connection.Dispose(); } return nextval; } </code></pre>
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    1. POHow would you implement sequences in Microsoft SQL Server?
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    1. USGeorge Siggouroglou
    1. USGeorge Siggouroglou
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    1. COIs this atomic? If two callers called nextval at the exact same time, would they get the the same number?
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      1. USClavijo
    2. COThis solution is not solving the concurrently request for a new id problem. If two or more clients call the nextval procedure at the same absolutely time then it is not clear what will be append. It is a solution for a small system. This solution solves only my pre known id problem, when insertind data.
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      1. USGeorge Siggouroglou
 

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