Database::DumpTruck(3pm)

1Database::DumpTruck(3)User Contributed Perl DocumentationDatabase::DumpTruck(3)
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NAME

6       Database::DumpTruck - Relaxing interface to SQLite
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SYNOPSIS

9         my $dt = new Database::DumpTruck;
10
11         $dt->insert({Hello => 'World'});
12         $dt->create_index(['Hello']);
13         $dt->upsert({Hello => 'World', Yolo => 8086});
14         my $data = $dt->dump;
15
16         $dt->insert([
17             {Hello => 'World'},
18             {Hello => 'Hell', Structured => {
19                 key => value,
20                 array => [ 1, 2, 3, {} ],
21             }}], 'table2');
22         my $data2 = $dt->dump('table2');
23         $dt->drop('table2');
24         $dt->execute('SELECT 666');
25
26         my @columns = $dt->column_names();
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28         $dt->save_var('number_of_the_beast', 666);
29         my $number_of_the_beast = $dt->get_var('number_of_the_beast');
30

DESCRIPTION

32       This is a simple document-oriented interface to a SQLite database,
33       modelled after Scraperwiki's Python "dumptruck" module. It allows for
34       easy (and maybe inefficient) storage and retrieval of structured data
35       to and from a database without interfacing with SQL.
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37       Database::DumpTruck attempts to identify the type of the data you're
38       inserting and uses an appropriate SQLite type:
39
40       "integer"
41           This is used for integer values. Will be used for 8086, but not
42           "8086" or 8086.0.
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44       "real"
45           This is used for numeric values that are not integer. Will be used
46           for 8086.0, but not "8086" or 8086.
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48       "bool"
49           This is used for values that look like result of logical statemen.
50           A crude check for values that are both "" and 0 or both "1" and 1
51           at the same time is in place. This is a result of comparison or a
52           negation.
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54           To force a value to look like boolean, prepend it with a double
55           negation: e.g.  "!!0" or "!!1".
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57       "json text"
58           Used for "ARRAY" and "HASH" references. Values are converted into
59           and from JSON strings upon "insert" and "dump".
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61       "text"
62           Pretty much everything else.
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METHODS

65       new ([params])
66           Initialize the database handle. Accepts optional hash with
67           parameters:
68
69           dbname (Default: "dumptruck.db")
70                   The database file.
71
72           table (Default: "dumptruck")
73                   Name for the default table.
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75           vars_table (Default: "_dumptruckvars")
76                   Name of the variables table.
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78           vars_table_tmp (Default: "_dumptruckvarstmp")
79                   Name of the temporary table used when converting the values
80                   for variables table.
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82           auto_commit (Default: 1)
83                   Enable automatic commit.
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85       column_names ([table_name])
86           Return a list of names of all columns in given table, or table
87           "dumptruck".
88
89       execute (sql, [params])
90           Run a raw SQL statement and get structured output. Optional
91           parameters for "?"  placeholders can be specified.
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93       commit ()
94           Commit outstanding transaction. Useful when "auto_commit" is off.
95
96       close ()
97           Close the database handle. You should not need to call this
98           explicitly.
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100       create_index (columns, [table_name], [if_not_exists], [unique])
101           Create an optionally unique index on columns in a given table. Can
102           be told to do nothing if the index already exists.
103
104       create_table (data, table_name, [error_if_exists])
105           Create a table and optionally error out if it already exists. The
106           data structure will be based on data, though no data will be
107           inserted.
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109       insert (data, [table_name], [upsert])
110           Insert (and optionally replace) data into a given table or
111           "dumptruck".  Creates the table with proper structure if it does
112           not exist already.
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114       upsert (data, [table_name])
115           Replace data into a given table or "dumptruck". Creates the table
116           with proper structure if it does not exist already.
117
118           Equivalent to calling "insert" with "upsert" parameter set to 1.
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120       get_var (key)
121           Retrieve a saved value for given key from the variable database.
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123       save_var (key, value)
124           Insert a value for given key into the variable database.
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126       tables ()
127           Returns a list of names of all tables in the database.
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129       dump ([table_name])
130           Returns all data from the given table or "dumptduck" nicely
131           structured.
132
133       drop ([table_name])
134           Drop the given table or "dumptruck".
135

BUGS

137       None known.
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COPYRIGHT

144       Copyright 2014, Lubomir Rintel
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146       This program is free software; you can redistribute it and/or modify it
147       under the same terms as Perl itself.
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AUTHOR

150       Lubomir Rintel <lkundrak@v3.sk>
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154perl v5.32.0                      2020-07-28            Database::DumpTruck(3)