System.Data.SQLite

Hello

I have encountered a problem with literal values in a view not being mapped by Entity Framework.

Any column that provides a literal value or result of a function, produces the following error when doing database first Entity generation in Visual Studio:
Error Code 6005 (The data type '' is currently not supported for the target Entity Framework version)

The end result is that not all columns in my view are available to my application.

This seems to be limited to columns where literal values are provided or the column is the result of a function. This also happens in a UNION query where the first query may provide a value stored in a table, but the next query provides a literal value for the same column.

I have posted a question at stack overflow as well
(http://stackoverflow.com/questions/29395943/view-column-types-not-supported-entity-framework) One other user has experienced this issue and even tried declaring data types in the view, but this did not work for them.

Thank You

Could you provide an example schema that demonstrates the issue?  Also, it would
be helpful if there was a small C# example as well.

<verbatim>
The SQLite core command line utility produces the following results:

sqlite> pragma table_info(VW_Vehicles);
cid         name        type        notnull     dflt_value  pk
----------  ----------  ----------  ----------  ----------  ----------
0           Id          INTEGER     0                       0
1           Type        TEXT        0                       0
2           Make        TEXT        0                       0
3           Model       TEXT        0                       0
4           Year        INTEGER     0                       0
5           Mpg                     0                       0
6           YearsOld                0                       0
</verbatim>

Since the SQLite core library is not reporting type information for those two
columns, I'm not sure how System.Data.SQLite should handle it differently.  In
the past, when this issue has come up, see ticket [3c00ec5b521b], a workaround
has been used, namely setting the environment variables:

    Use_SQLiteConvert_DefaultDbType
    Use_SQLiteConvert_DefaultTypeName

Also see the full list of supported environment variables, here:

    [/artifact?ci=trunk&filename=Doc/Extra/Provider/environment.html]

To enable easier use of the connection flags related to type handling, e.g.
DetectTextAffinity and DetectStringType, I've added support for a new environment
variable, named "DefaultFlags_SQLiteConnection" that may be set to any string
that can be converted to a SQLiteConnectionFlags enumerated value, e.g.
"DetectTextAffinity, DetectStringType" (note the embedded comma).  This should
permit easier integration with Entity Framework for columns without explicit
types.

See check-in [719a56624a8129c7] on trunk.

See also ticket [3c00ec5b521b71073b74].

This is addressed via the new "DefaultFlags_SQLiteConnection" environment
variable that allows the connection flags to be set on a process-wide basis.

When this new environment variable is set to:

    "DetectTextAffinity, DetectStringType"

It should return appropriate data types for otherwise untyped columns, for
use with EF6, etc.