Retrieve value of a table and using the value in stored procedure - sql

Question

I'm beginner in SQL Server 2012; I need to generate a product ID in a stored procedure, I generated part of the ID in C#, that part of ID includes Industrialist ID and I pass this to my stored procedure. In the stored procedure I need the last product of my Industrialist number and save in to as SQL variable on my stored procedure. How can I do this?

Answer 1

There are many ways to pass items between SQL and C#, you could use an output parameter where you will populate the parameter within the stored procedure.
string variableName;
using (var conn = new SqlConnection("**connection string**"))
using (var cmd = new SqlCommand("storedProcedureName", conn))
{
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("inputParameter", inputParameter);
var outputParameter = new SqlParameter(){
ParameterName="ParameterName"
,Direction = ParameterDirection.Output
,SqlDbType = SqlDbType.VarChar
,DbType = DbType.VarChar
};
conn.Open();
try
{
cmd.ExecuteNonQuery();
variableName = string.Format("{0}", outputParameter.Value);
}
catch{}
finally
{
conn.Close();
}
}
You could return the value using something along the lines of RETURN #returnValue in your procedure, or you could return it within a table.
string variableName;
using (var conn = new SqlConnection("**connection string**"))
using (var cmd = new SqlCommand("storedProcedureName", conn))
{
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("inputParameter", inputParameter);
conn.Open();
try
{
using (var dbReader = cmd.ExecuteReader())
{
if (dbReader.Read())
{
variableName = string.Format("{0}", dbReader["ColumnName"]);
}
}
}
catch{}
finally
{
conn.Close();
}
}
A generic example of a stored procedure which might work:
CREATE PROC [dbo].[storedProcedureName]
#InputParameter VARCHAR
,#OutputParameter VARCHAR OUTPUT
AS BEGIN
DECLARE #insertedId INT;
BEGIN TRANSACTION
INSERT INTO TableName (...Column Names...)
VALUES (... Values...)
SET #insertedId = SCOPE_IDENTITY()
COMMIT
SELECT #OutputParameter = ColumnName
FROM TableName
WHERE IdColumnName = #insertedId
END
EDIT: Possibly more relevant:
CREATE PROC [dbo].[storedProcedureName]
#IndustrialistId INT
,#OutputParameter VARCHAR OUTPUT -- This might be an int, but it's unclear what you want
AS BEGIN
DECLARE #productId INT;
SELECT #productId = MAX(ProductId)
FROM Products
WHERE IndustrialistId = #IndustrialistId;
SET #OutputParameter = CONVERT(VARCHAR,#IndustrialistId) + '-' + CONVERT(VARCHAR,#productId)
END
If you were to provide some code it might be easier for someone to give you a more tailored response. None of the above code has been syntax checked etc. so should be considered more pseudo code but hopefully it gives you something to work with.