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69 lines
1.9 KiB
Markdown
69 lines
1.9 KiB
Markdown
# libretrodb
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A small read only database
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Mainly to be used by retroarch
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# Usage
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Files specified later in the chain **will override** earlier ones if the same key exists multiple times.
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To list out the content of a db `libretrodb_tool <db file> list`
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To create an index `libretrodb_tool <db file> create-index <index name> <field name>`
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To find an entry with an index `libretrodb_tool <db file> find <index name> <value>`
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# lua converters
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In order to write you own converter you must have a lua file that implements the following functions:
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~~~.lua
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-- this function gets called before the db is created and should validate the
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-- arguments and set up the ground for db insertion
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function init(...)
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local args = {...}
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local script_name = args[1]
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end
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-- this is in iterator function. It is called before each insert.
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-- the function should return a table for insertion or nil when there are no
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-- more records to insert.
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function get_value()
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return {
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key = "value", -- will be saved as string
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num = 3, -- will be saved as int
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bin = binary("some string"), -- will be saved as binary
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unum = uint(3), -- will be saved as uint
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some_bool = true, -- will be saved as bool
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}
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end
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~~~
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# dat file converter
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To convert a dat file use:
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~~~
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dat_converter <db file> <dat file>
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~~~
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If you want to merge multiple dat files you need to run:
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~~~
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dat_converter <db file> <match key> <dat file> ...
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~~~
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for example:
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~~~
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dat_converter snes.rdb rom.crc snes1.dat snes2.dat
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~~~
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# Query examples
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Some examples of queries you can use with libretrodbtool:
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1) Glob pattern matching
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Usecase : Search for all games starting with 'Street Fighter' in the 'name' field (glob pattern matching)
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`libretrodb_tool <db file> find "{'name':glob('Street Fighter*')}"`
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2) Combined number matching query
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Usecase: Search for all games released on October 1995.
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`libretrodb_tool <db file> find "{'releasemonth':10,'releaseyear':1995}"`
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