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update, expand, and re-sequence libretro-db doc

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libretro-db/README.md
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@ -5,11 +5,67 @@ Mainly to be used by retroarch
# Usage
Files specified later in the chain **will override** earlier ones if the same key exists multiple times.
To list out the content of a db `libretrodb_tool <db file> list`
To create an index `libretrodb_tool <db file> create-index <index name> <field name>`
To find an entry with an index `libretrodb_tool <db file> find <index name> <value>`
* To list out the content of a db `libretrodb_tool <db file> list`
* To create an index `libretrodb_tool <db file> create-index <index name> <field name>`
* To find an entry with an index `libretrodb_tool <db file> find <index name> <value>`
# lua converters
# Compiling a single database with `c_converter`
```
git clone git@github.com:libretro/libretro-super.git
cd libretro-super
./libretro-fetch.sh retroarch
cd retroarch
./configure
cd libretro-db
c_converter "NAME_OF_RDB_FILE.rdb" "NAME_OF_SOURCE_DAT.dat"
```
# Compiling all databases with libretro-build-database.sh
**This approach builds and uses the `c_converter` program to compile the databases**
```
git clone git@github.com:libretro/libretro-super.git
cd libretro-super
./libretro-fetch.sh retroarch
cd retroarch
./configure
cd ..
./libretro-build-database.sh
```
# Lua DAT file converter
To convert a dat file use:
~~~
dat_converter <db file> <dat file>
~~~
If you want to merge multiple dat files you need to run:
~~~
dat_converter <db file> <match key> <dat file> ...
~~~
for example:
~~~
dat_converter snes.rdb rom.crc snes1.dat snes2.dat
~~~
# Query examples
Some examples of queries you can use with libretrodbtool:
1) Glob pattern matching
Usecase : Search for all games starting with 'Street Fighter' in the 'name' field (glob pattern matching)
`libretrodb_tool <db file> find "{'name':glob('Street Fighter*')}"`
2) Combined number matching query
Usecase: Search for all games released on October 1995.
`libretrodb_tool <db file> find "{'releasemonth':10,'releaseyear':1995}"`
3) Names only search
Usecase: Search for all games released on October 1995, wont print checksums, filename or rom size, only the game name.
`libretrodb_tool <db file> get-names "{'releasemonth':10,'releaseyear':1995}"`
# Writing Lua converters
In order to write you own converter you must have a lua file that implements the following functions:
~~~.lua
@ -33,51 +89,3 @@ function get_value()
}
end
~~~
# dat file converter
To convert a dat file use:
~~~
dat_converter <db file> <dat file>
~~~
If you want to merge multiple dat files you need to run:
~~~
dat_converter <db file> <match key> <dat file> ...
~~~
for example:
~~~
dat_converter snes.rdb rom.crc snes1.dat snes2.dat
~~~
# Query examples
Some examples of queries you can use with libretrodbtool:
1) Glob pattern matching
Usecase : Search for all games starting with 'Street Fighter' in the 'name' field (glob pattern matching)
`libretrodb_tool <db file> find "{'name':glob('Street Fighter*')}"`
2) Combined number matching query
Usecase: Search for all games released on October 1995.
`libretrodb_tool <db file> find "{'releasemonth':10,'releaseyear':1995}"`
3) Names only search
Usecase: Search for all games released on October 1995, wont print checksums, filename or rom size, only the game name.
`libretrodb_tool <db file> get-names "{'releasemonth':10,'releaseyear':1995}"`
# Compiling the Database
Use [libretro-super](https://github.com/libretro/libretro-super) to compile the entire database:
```
git clone git@github.com:libretro/libretro-super.git
cd libretro-super
./libretro-fetch.sh retroarch
./libretro-build-database.sh
```