126 lines
3.0 KiB
Markdown
126 lines
3.0 KiB
Markdown
# Query
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A query builder/database abstraction layer, using prepared queries for security.
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[](http://travis-ci.org/timw4mail/Query)
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## Requirements
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* Pdo extensions for the databases you wish to use (unless it's Firebird, in which case, the interbase extension is required)
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* PHP 5.2+
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## Databases Supported
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* Firebird (via interbase extension)
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* MySQL
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* PostgreSQL
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* SQLite
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* Others, via ODBC
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## Including Query in your application
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To include Query in your PHP project, just include the `autoload.php` file. This will automatically load the classes that are supported by the current PHP installation.
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## Connecting
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Create a connection array or object similar to this:
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<?php
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$params = array(
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'type' => 'mysql',
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'host' => 'localhost',
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'user' => 'root',
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'pass' => '',
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'port' => '3306',
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'database' => 'test_db',
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// Only required
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// SQLite or Firebird
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'file' => '/path/to/db/file',
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// Optional paramaters
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'prefix' => 'tbl_', // Database table prefix
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'alias' => 'old' // Connection name for the Query function
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);
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$db = Query($params);
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The parameters required depend on the database.
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### Query function
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You can use the `Query()` function as a reference to the last connected database. E.g.
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Query()->get('table_name');
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or
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$result = Query()->query($sql);
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If the `alias` key is set in the parameters, you can refer to a specific database connection
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// Set the alias in the connection parameters
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$params['alias'] = 'old';
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// Connect to the legacy database
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Query('old')->query($sql);
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### Running Queries
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Query uses the same interface as CodeIgniter's [Active Record class](http://codeigniter.com/user_guide/database/active_record.html). However, it does not implement the `update_batch` or caching methods.
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####You can also run queries manually.
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To run a prepared statement, call
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`$db->prepare_execute($sql, $params)`.
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To run a plain query, `$db->query($sql)`
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### Retrieving Results:
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An example of a moderately complex query:
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$query = $db->select('id, key as k, val')
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->from('table t')
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->where('k >', 3)
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->or_where('id !=' 5)
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->order_by('val', 'DESC')
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->limit(3, 1)
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->get();
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This will generate a query similar to (with this being the output for a Postgres database):
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SELECT "id", "key" AS "k", "val"
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FROM "table" "t"
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WHERE "k" > ?
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OR "id" != ?
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ORDER BY "val" DESC
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LIMIT 3 OFFSET 1
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To retreive the results of a query, use the PDO method [fetch](http://php.net/manual/en/pdostatement.fetch.php) and/or [fetchAll](http://php.net/manual/en/pdostatement.fetchall.php).
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$query = $db->get('table_name');
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$results = $query->fetchAll(PDO::FETCH_ASSOC);
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### Inserting / Updating
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An example of an insert query:
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$query = $db->set('foo', 'bar')
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->set('foobar', 'baz')
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->where('foo !=', 'bar')
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->insert('table');
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An example of an update query:
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$query = $db->set('foo', 'bar')
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->set('foobar', 'baz')
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->where('foo !=', 'bar')
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->update('table');
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The `set` method can also take an array as a paramater, instead of setting individual values.
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