cleaning up various codes.

laravel/database/connectors/sqlite.php

@@ -14,8 +14,7 @@ class SQLite extends Connector {
 
 		// SQLite provides supported for "in-memory" databases, which exist only for the
 		// lifetime of the request. Any given in-memory database may only have one PDO
-		// connection open to it at a time. Generally, these databases are used for
+		// connection open to it at a time. These are usually for testing.
-		// testing and development purposes, not in production scenarios.
 		if ($config['database'] == ':memory:')
 		{
 			return new PDO('sqlite::memory:', null, null, $options);

laravel/database/grammar.php

@@ -63,8 +63,7 @@ abstract class Grammar {
 
 		// If the value being wrapped contains a column alias, we need to
 		// wrap it a little differently as each segment must be wrapped
-		// and not the entire string. We'll split the value on the "as"
+		// and not the entire string.
-		// joiner to extract the column and the alias.
 		if (strpos(strtolower($value), ' as ') !== false)
 		{
 			$segments = explode(' ', $value);

laravel/database/query.php

@@ -401,11 +401,11 @@ class Query {
 		// will allow the developer to have a fresh query.
 		$query = new Query($this->connection, $this->grammar, $this->from);
 
-		// Once the callback has been run on the query, we will store the
-		// nested query instance on the where clause array so that it's
-		// passed to the query grammar.
 		call_user_func($callback, $query);
 
+		// Once the callback has been run on the query, we will store the
+		// nested query instance on the where clause array so that it's
+		// passed to the query's query grammar instance.
 		$this->wheres[] = compact('type', 'query', 'connector');
 
 		$this->bindings = array_merge($this->bindings, $query->bindings);

laravel/database/schema.php

@@ -16,7 +16,44 @@ class Schema {
 	{
 		call_user_func($callback, $table = new Schema\Table($table));
 
-		static::implications($table);
+		return static::execute($table);
+	}
+
+	/**
+	 * Create a new database table schema.
+	 *
+	 * @param  string   $table
+	 * @param  Closure  $callback
+	 * @return void
+	 */
+	public static function create($table, $callback)
+	{
+		$table = new Schema\Table($table);
+
+		// To indicate that the table is new and needs to be created, we'll run
+		// the "create" command on the table instance. This tells schema it is
+		// not simply a column modification operation.
+		$table->create();
+
+		call_user_func($callback, $table);
+
+		return static::execute($table);
+	}
+
+	/**
+	 * Drop a database table from the schema.
+	 *
+	 * @param  string  $table
+	 * @return void
+	 */
+	public static function drop($table)
+	{
+		$table = new Schema\Table($table);
+
+		// To indicate that the table needs to be dropped, we will run the
+		// "drop" command on the table instance and pass the instance to
+		// the execute method as calling a Closure isn't needed.
+		$table->drop();
 
 		return static::execute($table);
 	}
@@ -29,22 +66,27 @@ class Schema {
 	 */
 	public static function execute($table)
 	{
+		// The implications method is responsible for finding any fluently
+		// defined indexes on the schema table and adding the explicit
+		// commands that are needed to tbe schema instance.
+		static::implications($table);
+
 		foreach ($table->commands as $command)
 		{
 			$connection = DB::connection($table->connection);
 
 			$grammar = static::grammar($connection);
 
-			// Each grammar has a function that corresponds to the command type and is for
+			// Each grammar has a function that corresponds to the command type and
-			// building that command's SQL. This lets the SQL generation stay granular
+			// is for building that command's SQL. This lets the SQL syntax builds
-			// and flexible across various database systems.
+			// stay granular across various database systems.
 			if (method_exists($grammar, $method = $command->type))
 			{
 				$statements = $grammar->$method($table, $command);
 
-				// Once we have the statements, we will cast them to an array even though
+				// Once we have the statements, we will cast them to an array even
-				// not all of the commands return an array just in case the command
+				// though not all of the commands return an array just in case it
-				// needs multiple queries to complete its database work.
+				// needs multiple queries to complete.
 				foreach ((array) $statements as $statement)
 				{
 					$connection->statement($statement);

laravel/database/schema/grammars/mysql.php

@@ -28,9 +28,6 @@ class MySQL extends Grammar {
 		// of the table as they're added in separate commands.
 		$sql = 'CREATE TABLE '.$this->wrap($table).' ('.$columns.')';
 
-		// MySQL supports various "engines" for database tables. If an engine was
-		// specified by the developer, we will set it after adding the columns
-		// the table creation statement the schema.
 		if ( ! is_null($table->engine))
 		{
 			$sql .= ' ENGINE = '.$table->engine;