1DBD::SQLite::VirtualTabUlsee:r:FCiolnetCroinbtuetnetdD(B3PD)e:r:lSQDLoictuem:e:nVtiarttiuoanlTable::FileContent(3)
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NAME

6       DBD::SQLite::VirtualTable::FileContent -- virtual table for viewing
7       file contents
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SYNOPSIS

10       Within Perl :
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12         $dbh->sqlite_create_module(fcontent => "DBD::SQLite::VirtualTable::FileContent");
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14       Then, within SQL :
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16         CREATE VIRTUAL TABLE tbl USING fcontent(
17            source      = src_table,
18            content_col = content,
19            path_col    = path,
20            expose      = "path, col1, col2, col3", -- or "*"
21            root        = "/foo/bar"
22            get_content = Foo::Bar::read_from_file
23           );
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25         SELECT col1, path, content FROM tbl WHERE ...;
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DESCRIPTION

28       A "FileContent" virtual table is bound to some underlying source table,
29       which has a column containing paths to files.  The virtual table
30       behaves like a database view on the source table, with an added column
31       which exposes the content from those files.
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33       This is especially useful as an "external content" to some fulltext
34       table (see DBD::SQLite::Fulltext_search) : the index table stores some
35       metadata about files, and then the fulltext engine can index both the
36       metadata and the file contents.
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PARAMETERS

39       Parameters for creating a "FileContent" virtual table are specified
40       within the "CREATE VIRTUAL TABLE" statement, just like regular column
41       declarations, but with an '=' sign.  Authorized parameters are :
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43       "source"
44           The name of the source table.  This parameter is mandatory. All
45           other parameters are optional.
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47       "content_col"
48           The name of the virtual column exposing file contents.  The default
49           is "content".
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51       "path_col"
52           The name of the column in "source" that contains paths to files.
53           The default is "path".
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55       "expose"
56           A comma-separated list (within double quotes) of source column
57           names to be exposed by the virtual table. The default is "*", which
58           means all source columns.
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60       "root"
61           An optional root directory that will be prepended to the path
62           column when opening files.
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64       "get_content"
65           Fully qualified name of a Perl function for reading file contents.
66           The default implementation just slurps the entire file into a
67           string; but this hook can point to more sophisticated
68           implementations, like for example a function that would remove html
69           tags. The hooked function is called like this :
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71             $file_content = $get_content->($path, $root);
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AUTHOR

74       Laurent Dami <dami@cpan.org>
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77       Copyright Laurent Dami, 2014.
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79       This library is free software; you can redistribute it and/or modify it
80       under the same terms as Perl itself.
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84perl v5.32.1                      2021D-B0D1:-:2S7QLite::VirtualTable::FileContent(3)
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