I am building an IQueryable<int>
and depending on what criteria the user selects, the alias of the int column in the generated SQL may vary. Sometimes it's the name of the column and sometimes it's something like "C1". Similar to my question here where I ask How can I get the parameters of an Entity Framework query?, I am wondering if there's a way to get the generated alias name of the query?
This doesn't directly answer my original question, but I just learned of an awesome trick that allows me to override what the alias would be (in SQL Server) and I had to share it.
var query = myIQueryable.ToString();
var sql = $@"SELECT x.myAlias
FROM ({query}) x(myAlias)";
Now I can combine my super-complex IQueryable with this little snippet of SQL to do bulk insert and update operations. Such as:
var query = myIQueryable.ToString();
var sql = $@"INSERT INTO dbo.myTable (col1)
SELECT x.myAlias
FROM ({query}) x(myAlias)";
Or
var query = myIQueryable.ToString();
var sql = $@"UPDATE dbo.myTable
SET Col1 = 1
FROM dbo.myTable
JOIN ({query}) x(myAlias) ON x.myAlias = dbo.myTable.SomeColumn";
Of course, you still have to plug in the parameters of the query, which you can get by following the example given on my previous question: How can I get the parameters of an Entity Framework query?