[Libreoffice-bugs] [Bug 117253] FIREBIRD: Migration: Migration routine does not import HSQL TEXT TABLES.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=117253

--- Comment #1 from Drew Jensen <drewjensen.inbox at gmail.com> ---
Sorry, I hit save to quickly.

Firebird does have support for external files also but the implementation is
somewhat different from HSQLdb.

HSQLdb embedded in ODB files uses a restricted naming scheme for the external
files and requires that the files be stored in either the same directory as the
ODB file or a directory below that.

Firebird 3.0 also offers this restricted mode for their 'external file'
support. Which would, it seems, allow the same restrictions as now.

The fb engine must be configured for this support using the configuration item: 
ExternalFileAccess = (None, Full, Restricted)

For restricted mode a list of directories are supplied and relative naming is
allowed. ExternalFileAccess = Restrict /some/directory

Two pieces of functionality available in HSQL are not available in fb.

1: The ability to create a text table from a SELECT INTO statement, in HSQL if
you supply a file name and it does not exist the file is created with a
structure to match the result set and the data copied into it. Under fb you can
only do SELECT INTO a text table that has already been defined and that already
exists on disk.

2: In HSQL you can change which file file a TEXT TABLE definition points to
with a SET command. In FB the table definition must be dropped and recreated to
do that.

I don't know what the current configuration setting is. Executing a CREATE
TABLE command in the SQL window will run to completion and the table defintion
is displayed, but no column information is saved, it is a table with zero
columns. (I know, needs a different issue)

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