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laravel-cassandra

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A Query builder with support for Cassandra, using the original Laravel API. This library extends the original Laravel classes, so it uses exactly the same methods.

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Lacassa
=======
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## WORKING ON A NEW VERSION WAIT FOR DOCUMENTATION UPDATES

A Query builder with support for Cassandra, using the original Laravel API.
This library extends the original Laravel classes, so it uses exactly the same methods.

## **Table of contents**

* Installation

* Configuration

* Query Builder

* Schema

* Extensions

* Examples

## **Installation**

Make sure you have the DataStax PHP Driver for Apache Cassandra installed.
You can find installation instructions at [datastax repo](https://github.com/datastax/php-driver).

Note: _datastax php-driver works with php version 5.6.\*, 7.0.\* and 7.1.\* only_

### Installation using composer

```sh
composer require shso/laravel-cassandra
```

And add the service provider in config/app.php:

```php
# config/app.php
...
providers: [
    ...,
    ShSo\Lacassa\CassandraServiceProvider::class,
    ...,
],
...
```

## **Configuration**

Change your default database connection name in config/database.php:

```php
# config/database.php
'default' => env('DB_CONNECTION', 'cassandra'),
```

And add a new cassandra connection:

```php
# config/database.php
'cassandra' => [
    'driver' => 'cassandra',
    'host' => env('DB_HOST', '127.0.0.1'),
    'port' => env('DB_PORT', 9042),
    'keyspace' => env('DB_DATABASE', 'cassandra_db'),
    'username' => env('DB_USERNAME', ''),
    'password' => env('DB_PASSWORD', ''),
    'page_size' => '5000',
    'consistency' => 'local_one',
    'timeout' => null,
    'connect_timeout' => 5.0,
    'request_timeout' => 12.0,
],
```

Note: _you can enter all of your nodes like:_

# .env
    DB_HOST=192.168.100.140,192.168.100.141,192.168.100.142

Note: _you can choose one of the consistency levels below:_

|                 |                 |                 |                 |
|-----------------|-----------------|-----------------|-----------------|
| `any`           | `three`         | `local_qourum`  | `local_one`     |
| `one`           | `qourum`        | `each_qourum`   | `serial`        |
| `two`           | `all`           | `local_serial`  |                 |

***Query Builder***

The database driver plugs right into the original query builder.
When using cassandra connections, you will be able to build
fluent queries to perform database operations.

```php
$emp = DB::table('emp')->get();
$emp = DB::table('emp')->where('emp_name', 'Christy')->first();
```

If you did not change your default database connection, you will need to specify it on each query.

```php
$emp = DB::connection('cassandra')->table('emp')->get();
```

## **Examples**

### **Retrieving All Records**

```php
$emp = DB::table('emp')->all();
```

### **Indexing columns**

`CREATE INDEX` creates a new index on the given table for the named column.

```php
DB::table('users')->index(['name']);
```

### **Selecting columns**

```php
$emp = DB::table('emp')->where('emp_no', '>', 50)->select('emp_name', 'emp_no')->get();
$emp = DB::table('emp')->where('emp_no', '>', 50)->get(['emp_name', 'emp_no']);
```

### **Wheres**

The WHERE clause specifies which rows to query.
In the WHERE clause, refer to a column using the actual name, not an alias.
Columns in the WHERE clause need to meet one of these requirements:

* The partition key definition includes the column.

* A column that is indexed using `CREATE INDEX`.

```php
$emp = DB::table('emp')->where('emp_no', '>', 50)->take(10)->get();
```

### **And Statements**

```php
$emp = DB::table('emp')->where('emp_no', '>', 50)->where('emp_name', '=', 'Christy')->get();
```

### **Using Where In With An Array**

```php
$emp = DB::table('emp')->whereIn('emp_no', [12, 17, 21])->get();
```

### **Order By**

`ORDER BY` clauses can select a single column only.
Ordering can be done in ascending or descending order,
default ascending, and specified with the ASC or DESC keywords.
In the `ORDER BY` clause, refer to a column using the actual name, not the aliases.

```php
$emp = DB::table('emp')->where('emp_name', 'Christy')->orderBy('emp_no', 'desc')->get();
```

### **Limit**

We can use limit() and take() for limiting the query.

```php
$emp = DB::table('emp')->where('emp_no', '>', 50)->take(10)->get();
$emp = DB::table('emp')->where('emp_no', '>', 50)->limit(10)->get();
```

### **Distinct**

Distinct requires a _primary key_ field for which to return the distinct values.

```php
$emp = DB::table('emp')->distinct()->get(['emp_id']);
```

Distinct can be combined with **where**:

```php
$emp = DB::table('emp')->where('emp_sal', 45000)->distinct()->get(['emp_name']);
```

### **Count**

```php
$number = DB::table('emp')->count();
```

Count can be combined with **where**:

```php
$sal = DB::table('emp')->where('emp_sal', 45000)->count();
```

### **Truncate**

```php
$sal = DB::table('emp')->truncate();
```

### **Filtering a collection set, list, or map**

You can index the collection column, and then use the CONTAINS condition
in the WHERE clause to filter the data for a particular value in the collection.

```php
$emp = DB::table('emp')->where('emp_name', 'contains', 'Christy')->get();
```

After [indexing the collection keys](https://docs.datastax.com/en/cql/3.1/cql/cql_reference/create_index_r.html#reference_ds_eqm_nmd_xj__CreatIdxCollKey)
in the venues map, you can filter on map keys.

```php
$emp = DB::table('emp')->where('todo', 'contains key', '2014-10-02 06:30:00+0000')->get();
```

### **Raw Query**

The CQL expressions can be injected directly into the query.

```php
$emp = DB::raw('select * from emp');
```

## **Inserts, updates and deletes**

Inserting, updating and deleting records works just like the original QB.

### **Insert**

```php
DB::table('emp')
    ->insertCollection('set', 'phn', [123, 1234, 12345])
    ->insertCollection('map', 'friends', [['John', 'Male'], ['Eli', 'Female']])
    ->insert([
        'emp_id' => 11,
        'emp_name' => 'Christy',
        'emp_phone' => 12345676890,
        'emp_sal' => 500
    ]);
```

### **Updating**

To update a model, you may retrieve it, change an attribute, and use the update method.

```php
DB::table('emp')
    ->where('emp_id', 11)
    ->update([
        'emp_city' => 'kochi',
        'emp_name' => 'Christy jos',
        'emp_phone' =>  123456789
    ]);
```

### **Updating a collection set, list, and map**

Update collections in a row. The method will be like

```php
updateCollection(collection_type, column_name, operator, value);
```

Collection\_type is any of set, list or map.

Column\_name is the name of column to be updated.

Operator is + or -, + for adding the values to collection
and - to remove the value from collection.

Value can be associative array for map type
and array of string/number for list and set types.

```php
DB::table('users')->where('id', 1)
    ->updateCollection('set', 'phn', '+', [123, 1234,12345])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('set', 'phn', '-', [123])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('list', 'hobbies', '+', ['reading', 'cooking', 'cycling'])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('set', 'phn', '+', [123, 1234,12345])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('set', 'phn', '-', [123])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('list', 'hobbies', '+', ['reading', 'cooking', 'cycling'])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('list', 'hobbies', '-', ['cooking'])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('map', 'friends', '+', [['John', 'Male'], ['Rex', 'Male']])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('map', 'friends', '-', ['John'])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('map', 'friends', '+', [['John', 'Male'], ['Rex', 'Male']])->update();

DB::table('users')->where('id', 1)
    ->updateCollection('map', 'friends', '-', ['John'])->update();
```

### **Deleting**

To delete a model, simply call the delete method on the instance.
We can delete the rows in a table by using deleteRow method:

```php
$emp = DB::table('emp')->where('emp_city', 'Kochi')->deleteRow();
```

We can also perform delete by the column in a table using deleteColumn method:

```php
$emp = DB::table('emp')->where('emp_id', 3)->deleteColumn();
```

## **Testing**

I have created a docker container which has php7.0 and cassandra php driver
installed. It is prefered to use docker for testing purposes.

Also there is a `run` executable which is there to ease use of docker
container. It checks everything and makes sure all dependancies and the
cassandra server are up and running and then passes your command to the
container.

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