## О модуле
Модуль "fdx" позволяет предоставить простой DML (Data Manipulation Language, подмножество языка SQL для манипулирования данными - это подъязык, отвечающий за добавление, редактирование или удаление данных из базы данных. В SQL этому языку соответствуют операторы INSERT, UPDATE, и DELETE ) и DQL (Data Query Language )- это подъязык, отвечающий за чтение или запрос данных из базы данных. В SQL этому языку соответствует оператор SELECT) для манипулирования хэшами в Futriix для пользователей SQL. Он преобразует входной оператор на языке SQL в набор чистых команд Futriix'а. Он не нуждается и не генерирует никаких промежуточных данных, которые занимали бы базы данных. Целевыми данными являются только ваши хэши. Он также предоставляет функцию импорта и экспорта данных из других субд в формате "CSV".
## Usage
```sql
$ futriix-cli
futriix:~> hmset phonebook:0001 name "Peter Nelson" tel "1-456-1246-3421" birth "2019-10-01" pos 3 gender "M"
futriix:~> hmset phonebook:0002 name "Betty Joan" tel "1-444-9999-1112" birth "2019-12-01" pos 1 gender "F"
futriix:~> hmset phonebook:0003 name "Bloody Mary" tel "1-666-1234-9812" birth "2018-01-31" pos 2 gender "F"
futriix:~> hmset phonebook:0004 name "Mattias Swensson" tel "1-888-3333-1412" birth "2017-06-30" pos 4 gender "M"
futriix:~> dbx select name,tel from phonebook where gender = "F" order by pos desc
1) 1) name
2) "Bloody Mary"
3) tel
4) "1-666-1234-9812"
2) 1) name
2) "Betty Joan"
3) tel
4) "1-444-9999-1112"
```
## Getting started
### Get the package and build the binary:
```sql
$ git clone https://github.com/cscan/dbx.git
$ cd dbx/src && make
```
This plugin library is written in pure C. A file dbx.so is built after successfully compiled.
### Load the module in Valkeys (3 ways)
1. Load the module in CLI
```sql
futriix:~> module load /path/to/dbx.so
```
2. Start the server with loadmodule argument
```sql
$ Valkeys-server --loadmodule /path/to/dbx.so
```
3. Adding the following line in the file Valkeys.conf and then restart the server
```sql
loadmodule /path/to/dbx.so
```
If you still have problem in loading the module, please visit: https://Valkeys.io/topics/modules-intro
## More Examples
### Select statement
You may specify multiple fields separated by comma
```sql
futriix:~> dbx select name, gender, birth from phonebook
1) 1) name
2) "Betty Joan"
3) gender
4) "F"
5) birth
6) "2019-12-01"
2) 1) name
2) "Mattias Swensson"
3) gender
4) "M"
5) birth
6) "2017-06-30"
3) 1) name
2) "Peter Nelson"
3) gender
4) "M"
5) birth
6) "2019-10-01"
4) 1) name
2) "Bloody Mary"
3) gender
4) "F"
5) birth
6) "2018-01-31"
```
"*" is support
```sql
futriix:~> dbx select * from phonebook where birth > '2019-11-11'
1) 1) "name"
2) "Betty Joan"
3) "tel"
4) "1-444-9999-1112"
5) "birth"
6) "2019-12-01"
7) "pos"
8) "1"
9) "gender"
10) "F"
```
If you want to show the exact keys, you may try rowid()
```sql
futriix:~> dbx select rowid() from phonebook
1) 1) rowid()
2) "phonebook:1588299191-764848276"
2) 1) rowid()
2) "phonebook:1588299202-1052597574"
3) 1) rowid()
2) "phonebook:1588298418-551514504"
4) 1) rowid()
2) "phonebook:1588299196-2115347437"
```
The above is nearly like ValkeyS keys command
```sql
futriix:~> keys phonebook*
1) "phonebook:1588298418-551514504"
2) "phonebook:1588299196-2115347437"
3) "phonebook:1588299202-1052597574"
4) "phonebook:1588299191-764848276"
```
Each record is exactly a hash, you could use raw ValkeyS commands ``hget, hmget or hgetall`` to retrieve the same content
#### Where clause
Your could specify =, >, <, >=, <=, <>, != or like conditions in where clause. Now the module only support "and" to join multiple conditions.
```sql
futriix:~> dbx select tel from phonebook where name like Son
1) 1) tel
2) "1-888-3333-1412"
2) 1) tel
2) "1-456-1246-3421"
futriix:~> dbx select tel from phonebook where name like Son and pos = 4
1) 1) tel
2) "1-888-3333-1412"
```
#### Order clause
Ordering can be ascending or descending. All sortings are alpha-sort.
```sql
futriix:~> dbx select name, pos from phonebook order by pos asc
1) 1) name
2) "Betty Joan"
3) pos
4) "1"
2) 1) name
2) "Bloody Mary"
3) pos
4) "2"
3) 1) name
2) "Peter Nelson"
3) pos
4) "3"
4) 1) name
2) "Mattias Swensson"
3) pos
4) "4"
futriix:~> dbx select name from phonebook order by pos desc
1) 1) name
2) "Mattias Swensson"
2) 1) name
2) "Peter Nelson"
3) 1) name
2) "Bloody Mary"
4) 1) name
2) "Betty Joan"
```
#### Top clause
```sql
futriix:~> dbx select top 3 name, tel from phonebook order by pos desc
1) 1) name
2) "Mattias Swensson"
3) tel
4) "1-888-3333-1412"
2) 1) name
2) "Peter Nelson"
3) tel
4) "1-456-1246-3421"
3) 1) name
2) "Bloody Mary"
3) tel
4) "1-666-1234-9812"
futriix:~> dbx select top 0 * from phonebook
(empty list or set)
```
#### Into clause for copy hash table
You could create another hash table by into clause.
```sql
futriix:~> dbx select * into testbook from phonebook
1) testbook:1588325407-1751904058
2) testbook:1588325407-1751904059
3) testbook:1588325407-1751904060
4) testbook:1588325407-1751904061
futriix:~> keys testbook*
1) "testbook:1588325407-1751904061"
2) "testbook:1588325407-1751904059"
3) "testbook:1588325407-1751904058"
4) "testbook:1588325407-1751904060"
futriix:~> dbx select * from testbook
1) 1) "name"
2) "Mattias Swensson"
3) "tel"
4) "1-888-3333-1412"
5) "birth"
6) "2017-06-30"
7) "pos"
8) "4"
9) "gender"
10) "M"
2) 1) "name"
2) "Peter Nelson"
3) "tel"
4) "1-456-1246-3421"
5) "birth"
6) "2019-10-01"
7) "pos"
8) "3"
9) "gender"
10) "M"
3) 1) "name"
2) "Bloody Mary"
3) "tel"
4) "1-666-1234-9812"
5) "birth"
6) "2018-01-31"
7) "pos"
8) "2"
9) "gender"
10) "F"
4) 1) "name"
2) "Betty Joan"
3) "tel"
4) "1-444-9999-1112"
5) "birth"
6) "2019-12-01"
7) "pos"
8) "1"
9) "gender"
10) "F"
```
#### Into csv clause for exporting records in csv format
```sql
futriix:~> dbx select * into csv "/tmp/testbook.csv" from phonebook where pos > 2
1) Kevin Louis,111-2123-1233,2009-12-31,6,F
2) Kenneth Cheng,123-12134-123,2000-12-31,5,M
futriix:~> quit
$ cat /tmp/testbook.csv
Kevin Louis,111-2123-1233,2009-12-31,6,F
Kenneth Cheng,123-12134-123,2000-12-31,5,M
$
```
### Delete statement
You may also use Insert and Delete statement to operate the hash. If you does not provide the where clause, it will delete all the records of the specified key prefix. (i.e. phonebook)
```sql
futriix:~> dbx delete from phonebook where gender = F
(integer) 2
futriix:~> dbx delete from phonebook
(integer) 2
```
### Insert statement
The module provides simple Insert statement which same as the function of the ValkeyS command hmset. It will append a random string to your provided key (i.e. phonebook). If operation is successful, it will return the key name.
```sql
futriix:~> dbx insert into phonebook (name,tel,birth,pos,gender) values ('Peter Nelson' ,1-456-1246-3421, 2019-10-01, 3, M)
"phonebook:1588298418-551514504"
futriix:~> dbx insert into phonebook (name,tel,birth,pos,gender) values ('Betty Joan' ,1-444-9999-1112, 2019-12-01, 1, F)
"phonebook:1588299191-764848276"
futriix:~> dbx insert into phonebook (name,tel,birth,pos,gender) values ('Bloody Mary' ,1-666-1234-9812, 2018-01-31, 2, F)
"phonebook:1588299196-2115347437"
futriix:~> dbx insert into phonebook (name,tel,birth,pos,gender) values ('Mattias Swensson' ,1-888-3333-1412, 2017-06-30, 4, M)
"phonebook:1588299202-1052597574"
futriix:~> hgetall phonebook:1588298418-551514504
1) "name"
2) "Peter Nelson"
3) "tel"
4) "1-456-1246-3421"
5) "birth"
6) "2019-10-01"
7) "pos"
8) "3"
9) "gender"
10) "M"
futriix:~>
```
Note that Valkeys requires at least one space after the single and double quoted arguments, otherwise you will get ``Invalid argument(s)`` error. If you don't want to take care of this, you could quote the whole SQL statement by double quote as below:
```sql
futriix:~> dbx "insert into phonebook (name,tel,birth,pos,gender) values ('Peter Nelson','1-456-1246-3421','2019-10-01',3, 'M')"
```
#### From clause for importing CSV file
The module provides simple import function by specifying from clause in Insert statement. It only support comma deliminated. Please make sure that the specified import file can be accessed by Valkeys server.
```bash
$ cat > /tmp/test.csv << EOF
"Kenneth Cheng","123-12134-123","2000-12-31","5","M"
"Kevin Louis","111-2123-1233","2009-12-31","6","F"
EOF
$ Valkeys-cli
futriix:~> dbx insert into phonebook (name, tel, birth, pos, gender) from "/tmp/test.csv"
1) "phonebook:1588509697-1579004777"
2) "phonebook:1588509697-1579004778"
futriix:~> dbx select name from phonebook
1) 1) name
2) "Kenneth Cheng"
2) 1) name
2) "Kevin Louis"
futriix:~> dbx delete from phonebook
(integer) 2
futriix:~> quit
$ cat > /tmp/testheader.csv << EOF
name,tel,birth,pos,gender
"Kenneth Cheng","123-12134-123","2000-12-31","5","M"
"Kevin Louis","111-2123-1233","2009-12-31","6","F"
EOF
$ Valkeys-cli
futriix:~> dbx insert into phonebook from "/tmp/testheader.csv"
1) "phonebook:1588509697-1579004779"
2) "phonebook:1588509697-1579004780"
futriix:~> dbx select name from phonebook
1) 1) name
2) "Kenneth Cheng"
2) 1) name
2) "Kevin Louis"
```
### Issue command from BASH shell
```sql
$ Valkeys-cli dbx select "*" from phonebook where gender = M order by pos desc
1) 1) "name"
2) "Mattias Swensson"
3) "tel"
4) "1-888-3333-1412"
5) "birth"
6) "2017-06-30"
7) "pos"
8) "4"
9) "gender"
10) "M"
2) 1) "name"
2) "Peter Nelson"
3) "tel"
4) "1-456-1246-3421"
5) "birth"
6) "2019-10-01"
7) "pos"
8) "3"
9) "gender"
10) "M"
$ Valkeys-cli dbx select name from phonebook where tel like 9812
1) 1) name
2) "Bloody Mary"
```
Note that "*" requires double quoted otherwise it will pass all the filename in current directory. Of course you could quote the whole SQL statement.
```sql
$ Valkeys-cli dbx "select * from phonebook where gender = M order by pos desc"
```
## Compatibility
ValkeyS v4.0
## License
MIT
