111 lines
3.1 KiB
PHP
111 lines
3.1 KiB
PHP
<?php namespace System;
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class DB {
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/**
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* The active database connections.
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*
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* @var array
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*/
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private static $connections = array();
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/**
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* Get a database connection.
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*
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* @param string $connection
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* @return PDO
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*/
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public static function connection($connection = null)
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{
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// ---------------------------------------------------
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// If no connection was given, use the default.
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// ---------------------------------------------------
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if (is_null($connection))
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{
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$connection = Config::get('db.default');
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}
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// ---------------------------------------------------
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// If we have already established this connection,
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// simply return the existing connection.
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// ---------------------------------------------------
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if ( ! array_key_exists($connection, static::$connections))
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{
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// ---------------------------------------------------
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// Get the database configurations.
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// ---------------------------------------------------
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$config = Config::get('db.connections');
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// ---------------------------------------------------
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// Verify the connection has been defined.
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// ---------------------------------------------------
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if ( ! array_key_exists($connection, $config))
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{
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throw new \Exception("Database connection [$connection] is not defined.");
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}
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// ---------------------------------------------------
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// Establish the database connection.
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// ---------------------------------------------------
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static::$connections[$connection] = DB\Connector::connect((object) $config[$connection]);
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}
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return static::$connections[$connection];
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}
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/**
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* Execute a SQL query against the connection.
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*
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* @param string $sql
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* @param array $bindings
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* @param string $connection
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* @return mixed
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*/
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public static function query($sql, $bindings = array(), $connection = null)
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{
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// ---------------------------------------------------
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// Create a new PDO statement from the SQL.
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// ---------------------------------------------------
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$query = static::connection($connection)->prepare($sql);
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// ---------------------------------------------------
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// Execute the query with the bindings.
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// ---------------------------------------------------
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$result = $query->execute($bindings);
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// ---------------------------------------------------
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// For SELECT statements, return the results in an
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// array of stdClasses.
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//
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// For UPDATE and DELETE statements, return the number
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// or rows affected by the query.
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//
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// For INSERT statements, return a boolean.
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// ---------------------------------------------------
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if (strpos(Str::upper($sql), 'SELECT') === 0)
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{
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return $query->fetchAll(\PDO::FETCH_CLASS, 'stdClass');
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}
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elseif (strpos(Str::upper($sql), 'UPDATE') === 0 or strpos(Str::upper($sql), 'DELETE') === 0)
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{
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return $query->rowCount();
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}
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else
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{
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return $result;
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}
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}
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/**
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* Begin a fluent query against a table.
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*
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* @param string $table
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* @param string $connection
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* @return Query
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*/
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public static function table($table, $connection = null)
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{
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return new DB\Query($table, $connection);
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}
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} |