DBD::SQLite::VirtualTable::FileContent(3) User Contributed Perl Documentation
NAME
DBD::SQLite::VirtualTable::FileContent -- virtual table for viewing
file contents
SYNOPSIS
Within Perl :
$dbh->sqlite_create_module(fcontent => "DBD::SQLite::VirtualTable::FileContent");
Then, within SQL :
CREATE VIRTUAL TABLE tbl USING fcontent(
source = src_table,
content_col = content,
path_col = path,
expose = "path, col1, col2, col3", -- or "*"
root = "/foo/bar"
get_content = Foo::Bar::read_from_file
);
SELECT col1, path, content FROM tbl WHERE ...;
DESCRIPTION
A "FileContent" virtual table is bound to some underlying source table,
which has a column containing paths to files. The virtual table
behaves like a database view on the source table, with an added column
which exposes the content from those files.
This is especially useful as an "external content" to some fulltext
table (see DBD::SQLite::Fulltext_search) : the index table stores some
metadata about files, and then the fulltext engine can index both the
metadata and the file contents.
PARAMETERS
Parameters for creating a "FileContent" virtual table are specified
within the "CREATE VIRTUAL TABLE" statement, just like regular column
declarations, but with an '=' sign. Authorized parameters are :
"source"
The name of the source table. This parameter is mandatory. All
other parameters are optional.
"content_col"
The name of the virtual column exposing file contents. The default
is "content".
"path_col"
The name of the column in "source" that contains paths to files.
The default is "path".
"expose"
A comma-separated list (within double quotes) of source column
names to be exposed by the virtual table. The default is "*", which
means all source columns.
"root"
An optional root directory that will be prepended to the path
column when opening files.
"get_content"
Fully qualified name of a Perl function for reading file contents.
The default implementation just slurps the entire file into a
string; but this hook can point to more sophisticated
implementations, like for example a function that would remove html
tags. The hooked function is called like this :
$file_content = $get_content->($path, $root);
AUTHOR
Laurent Dami <dami@cpan.org>
COPYRIGHT AND LICENSE
Copyright Laurent Dami, 2014.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.34.3 2024-10-19
DBD::SQLite::VirtualTable::FileContent(3)
dbd-sqlite 1.760.0 - Generated Sun Oct 20 06:47:05 CDT 2024