devco/trilogy

Simple, lightweight SQL statement abstraction.

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Language: PHP

1.2.0 2013-06-27 00:59 UTC

README

Simple, lightweight SQL statement abstraction.

Why

To abstract common operations against different backends.

Usage

The goal of Trilogy is to be as simple as possible to use and extend.

Drivers

Trilogy currently supports the following drivers:

  • Mysql
  • Pgsql

There are other drivers in the works:

  • Mongo
  • Mssql

Making a Connection

In order to make a connection using a particular driver, you just use the main Connection object.

$db = new Trilogy\Connection\Connection;

This will connect you to MySQL on localhost using port 3306 and connecting to the database default. These are probably the best default, but you'll more than likely want to specify other options:

$db = new Trilogy\Connection\Connection([
    'driver'   => 'pgsql',
    'host'     => '10.0.0.2',
    'port'     => 5432,
    'database' => 'mydb',
    'username' => 'myusername',
    'password' => 'mypassword',
    'options'  => []
]);
Driver Options
  • driver The Trilogy supported driver name to use.
  • host The host the database resides on.
  • port The host port.
  • database The name of the database to use.
  • username The database username.
  • password The database password.
  • options Any driver specific options to use.

Statements

Trilogy supports the following types of statements:

  • Find
  • Remove
  • Save

Statement Types

There are different types that make up a complete Trilogy statement.

  • Data Allows arbitrary data to be applied such as in an INSERT or UPDATE statement.
  • Field Allows fields to be selected like in a SELECT statement.
  • Join Allows joins to be applied like in a SELECT statement.
  • Limit Allows a statement to limit items in a result.
  • Sort Allows a statement to sort items in a result.
  • Source Allows a data source such as a table or collection to be selected.
  • Where Allows conditions to be applied.

Data Statement Type

The data part allows the application of arbitrary data.

$save = $db->save->data(['field1' => 'value1', 'field2' => 'value2']);

// [ 'field1' => 'value1', 'field2' => 'value2' ]
$save->getData();

Field Statement Type

The Field part allows fields to be selected.

$find = $db->find
    ->get('test1')
    ->get(['test2', 'test3']);

// [ 'test1', 'test2', 'test3' ]
$find->getFields();

Join Statement Type

$find = $db->find
    ->join('test2')
    ->on('test1.id = test2.id')
    ->open()
    ->andOn('test2.something', 1)
    ->orOn('test2.something', null)
    ->close();

// [ Trilogy\Statement\Part\Join, Trilogy\Statement\Part\Join, Trilogy\Statement\Part\Join ]
$find->getJoins();

// [ 1, null ]
$find->getJoinParams();

Limit Statement Type

$find = $db->find->limit(10, 20);

// same as...
$find = $db->find->page(10, 3);

// 10
$find->getLimit();

// 20
$find->getOffset();

// [10, 20]
$find->getLimitParams();

Sort Statement Type

$find = $db->find->sort('field1', 'desc');

// [ 'field1' => 'DESC' ]
$find->getSorts();

// [ 'field1', 'DESC' ]
$find->getSortParams();

Source Statement Type

$find = $db->find
    ->in('table1')
    ->in(['table2', 'table3']);

// [ 'table1', 'table2', 'table3' ]
$find->getSources();

Where Statement Type

$find = $db->find
    ->where('field1', 1)
    ->open()
    ->andWhere('field2', 2)
    ->orWhere('field3', 3)
    ->close();

// [ Trilogy\Statement\Part\Where, Trilogy\Statement\Part\Where, Trilogy\Statement\Part\Where ]
$find->getWheres();

// [ 1, 2, 3 ]
$find->getWhereParams();

Source Expressions

A source expression is broken down into two parts delimitted by whitespace:

<source> <alias = null>

Field Expressions

A field expression is broken down into two parts delimitted by whitespace:

<field> <alias = null>

Join and Where Expressions

Expressions are broken down into 3 parts delimitted by whitespace:

<field or alias> <operator = "="> <value = "?">

A field is just a field name. Nothing special. An operator is a special token that is used by the driver to convert to a valid operator for the backend it represents. The value can either be another field reference, or a ? placeholder.

Any source, field, alias or non-placeholder value is automatically quoted.

Valid operators are:

  • = Equals a value.
  • != Not equal to a value.
  • ~ Like a value.
  • !~ Not like a value.
  • * This field must contain one of the values in the specified array.
  • !* This field must NOT contain one of the values in the specified array.
  • < Less than.
  • <= Less than or equal to.
  • > Greater than.
  • >= Greater than or equal to.

Since operators are just passed through if no matching one is found, other operators may work but won't be abstracted by Trilogy.

Each type of statement uses these parts:

  • Find uses Field, Join, Limit, Sort, Source
  • Remove uses Source, Where
  • Save uses Data, Source, Where

Find Statement

The Find statement exists to return a result set.

$find = $this->db->find->in('test')->where('field1', 'value1');

You can select DISTINCT values.

$find = $this->db->find->in('test')->distinct()->where('field1', 'value1');

You can simply output the comiled statement:

echo $find->compile();

String conversion also works:

echo $find;

You can interate over a statement before it is even executed. Doing this executes the statement and returns an iterator results:

foreach ($find as $item) {
    ...
}

If you need to manually execute the statement:

$result = $find->execute();

Remove Statement

The Remove statement allows you to create a query that removes records from a data source.

$removed = $this->db->remove->in('test')->where('field1', 'value1')->execute();

Save Statement

The Save statement allows you to insert or update data. What determines whether or not it inserts or updates depends on if any conditions are given. If not, it inserts; if so, it updates.

Inserting:

$inserted = $this->db->save->in('test')->data(['field1' => 'value1']);

Multirow Inserting:

$inserted = $this->db->save->in('test')->dataSet([['field1' => 'value1'], ['field1' => 'value1']]);

Updating:

$updated = $this->db->save->in('test')->data(['field1' => 'value2'])->where('field1', 'value1');

License

Copyright (c) 2013 Ultra Serve Internet Pty Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.