A hello kitty implementation of a NoSQL (and no frills) database server based on the WiredTiger 3.2.1 storage engine. Currently supports up to 7 fields per table 😂
Download, compile, and install the WiredTiger 3.2.1 binaries. For convenience, here is a summary of their instructions:
cd wiredtiger[-3.2.1]
./configure
make
make install
You should now have /usr/local/lib/libwiredtiger.so, /usr/local/include/wiredtiger.h, and /usr/local/bin/wt.
Clone or download hellodb.cpp.
Compile the hellodb binary:
g++ -o /path/to/hellodb /path/to/hellodb.cpp -lwiredtiger -lpthread
Create a text file to define your table and index metadata:
#<table>
<field>
<field>
<field>
!<table>:<index>
<field>
<field>
#<table>
<field> <field> <field> <field>
!<table>:<index>
<field> <field>
For example, meta.cfg:
#customers
name age location
!customers:justname
name
!customers:location_age
location age
#transactions
item
price
date
customer
!transactions:dateAndItem
date
item
!transactions:itemAndCustomer
item
customer
Start the database server (in the background with log output):
/path/to/hellodb /path/to/meta.cfg /path/to/db/folder [port default is 27000] &>/path/to/hellodb.log &
Sorry, no client yet (but there is a bulk loader). You can use TCP tools such as nc or telnet. For convenience, you can set up a Bash function like so:
hello() {
echo $1 | nc -w1 localhost 27000
}
$ hello insert]customers]Joe]28]Boston
inserted>
recno: 1
$ hello 'insert]customers]Bob]35]New York'
inserted>
recno: 2
$ hello 'insert]customers]]35]New York'
inserted>
recno: 3
$ hello insert]customers]Susan]35
inserted>
recno: 4
Note: Single quotes are not necessary if you are using echo or nc interactively instead of via Bash function.
$ hello at]customers]1
1>
name: Joe
age: 28
location: Boston
$ hello at]customers]2
2>
name: Bob
age: 35
location: New York
$ hello at]customers]3
3>
name:
age: 35
location: New York
$ hello at]customers]4
4>
name: Susan
age: 35
location:
$ hello find]customers]justname]Bob
2>
name: Bob
age: 35
location: New York
$ hello 'find]customers]location_age]New York]35'
2>
name: Bob
age: 35
location: New York
3>
name:
age: 35
location: New York
$ hello dump]customers
1>
name: Joe
age: 28
location: Boston
2>
name: Bob
age: 35
location: New York
3>
name:
age: 35
location: New York
4>
name: Susan
age: 35
location:
$ hello update]customers]3]Jack
updated>
recno: 3
$ hello at]customers]3
3>
name: Jack
age: 35
location: New York
$ hello update]customers]4]Susan]35]Chicago
updated>
recno: 4
$ hello at]customers]4
4>
name: Susan
age: 35
location: Chicago
$ hello delete]customers]3
deleted>
recno: 3
$ hello at]customers]3
Not found
$ hello find]customers]justname]Jack
Not found
$ hello shutdown
$ ps -ef | grep hellodb
[1]+ Done hellodb
If you are using an interactive session via nc or telnet directly:
$ nc localhost 27000
find]customers]location_age]New York]35
2>
name: Bob
age: 35
location: New York
exit
$
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