Query/README.md

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# Query
A query builder/database abstraction layer, using prepared statements for security.
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## Requirements
* 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 7.1 or later
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## Databases Supported
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* MySQL
* PostgreSQL
* SQLite
## Including Query in your application
* Install via composer and include `vendor/autoload.php`
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## Connecting
Create a connection array or object similar to this:
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```php
<?php
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$params = array(
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'type' => 'mysql', // mysql, pgsql, sqlite
'host' => 'localhost', // address or socket
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'user' => 'root',
'pass' => '',
'port' => '3306',
'database' => 'test_db',
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// Only required for
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// SQLite
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'file' => '/path/to/db/file',
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// Optional parameters
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'prefix' => 'tbl_', // Database table prefix
'alias' => 'old' // Connection name for the Query function
);
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$db = Query($params);
```
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The parameters required depend on the database.
### Query function
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You can use the `Query()` function as a reference to the last connected database. E.g.
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```php
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<?php
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Query()->get('table_name');
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// or
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$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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```php
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<?php
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// Set the alias in the connection parameters
$params['alias'] = 'old';
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// Connect to the legacy database
Query('old')->query($sql);
```
### Running Queries
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Query is based on CodeIgniter's [Query Builder](http://www.codeigniter.com/user_guide/database/query_builder.html) class.
However, it has camelCased method names, and does not implement the caching methods.
For specific query builder methods, see the [class documentation](https://gitdev.timshomepage.net/Query/apiDocumentation/classes/Query_QueryBuilder.html#methods).
Other database methods not directly involved in building queries, are also available from the query builder object.
The methods available depend on the database, but common methods are documented
[here](https://gitdev.timshomepage.net/Query/apiDocumentation/classes/Query_Drivers_AbstractDriver.html#methods).
#### You can also run queries manually.
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To run a prepared statement, call
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`$db->prepareExecute($sql, $params)`.
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To run a plain query, `$db->query($sql)`
### Retrieving Results:
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An example of a moderately complex query:
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```php
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<?php
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$query = $db->select('id, key as k, val')
->from('table t')
->where('k >', 3)
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->orWhere('id !=' 5)
->orderBy('val', 'DESC')
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->limit(3, 1)
->get();
```
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This will generate a query similar to (with this being the output for a PostgreSQL database):
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```sql
SELECT "id", "key" AS "k", "val"
FROM "table" "t"
WHERE "k" > ?
OR "id" != ?
ORDER BY "val" DESC
LIMIT 3 OFFSET 1
```
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The query execution methods `get`, `getWhere`, `insert`,
`insertBatch`,`update`, and `delete` return a native [PDOStatemnt](http://php.net/manual/en/class.pdostatement.php) object.
To retrieve the results of a query, use the PDOStatement 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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```php
<?php
$query = $db->get('table_name');
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$results = $query->fetchAll(PDO::FETCH_ASSOC);
```
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### Inserting / Updating
An example of an insert query:
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```php
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<?php
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$query = $db->set('foo', 'bar')
->set('foobar', 'baz')
->where('foo !=', 'bar')
->insert('table');
```
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An example of an update query:
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```php
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<?php
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$query = $db->set('foo', 'bar')
->set('foobar', 'baz')
->where('foo !=', 'bar')
->update('table');
```
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The `set` method can also take an array as a parameter, instead of setting individual values.