diff --git a/README.md b/README.md
index 25d267e6..c877051f 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,9 @@
 
 > The Lightest PHP database framework to accelerate development
 
-### Main Features
+## Main Features
 
-* **Lightweight** - Only 20KB with one file.
+* **Lightweight** - 20KB around with only one file.
 
 * **Easy** - Extremely easy to learn and use, friendly construction.
 
@@ -18,10 +18,25 @@
 
 * **Free** - Under MIT license, you can use it anywhere if you want.
 
-### Get Started
+## Get Started
+
+### Install via composer
+
+Add Medoo to composer.json configuration file.
+```
+$ composer require catfan/Medoo
+```
+
+And update the composer
+```
+$ composer update
+```
 
 ```php
-// Include Medoo
+// If you installed via composer, just use this code to requrie autoloader on the top of your projects.
+require 'vendor/autoload.php';
+
+// Or if you just download the medoo.php into directory, require it with the correct path.
 require_once 'medoo.php';
 
 // Initialize
@@ -41,12 +56,9 @@ $database->insert('account', [
     'age' => 25,
     'lang' => ['en', 'fr', 'jp', 'cn']
 ]);
-
-// Or initialize from file and then
-$database = new medoo();
 ```
 
-### Contribution Guides
+## Contribution Guides
 
 For most of time, Medoo is using develop branch for adding feature and fixing bug, and the branch will be merged into master branch while releasing a public version. For contribution, submit your code to the develop branch, and start a pull request into it.
 
@@ -54,11 +66,11 @@ On develop branch, each commits are started with `[fix]`, `[feature]` or `[updat
 
 Keep it simple and keep it clear.
 
-### License
+## License
 
 Medoo is under the MIT License.
 
-### Links
+## Links
 
 * Official website: [http://medoo.in](http://medoo.in)
 
diff --git a/composer.json b/composer.json
index 1fabd8b6..b9569a88 100644
--- a/composer.json
+++ b/composer.json
@@ -6,19 +6,19 @@
 	"homepage": "http://medoo.in",
 	"license": "MIT",
 	"authors": [
-		{"name": "Angel Lai", "email": "angel.lai.cat@gmail.com"}
+		{"name": "Angel Lai", "email": "angel@catfan.me"}
 	],
 	"require": {
 		"php": ">=5.1",
 		"ext-pdo": "*"
 	},
 	"suggest": {
-		"ext-pdo-mysql": "For MySQL or MariaDB databases",
+		"ext-pdo_mysql": "For MySQL or MariaDB databases",
 		"ext-pdo_sqlsrv": "For MSSQL databases on Windows platform",
-		"ext-pdo_dblib": "For MSSQL or Sybase databases on Liunx/UNIX platform",
+		"ext-pdo_dblib": "For MSSQL or Sybase databases on Linux/UNIX platform",
 		"ext-pdo_oci": "For Oracle databases",
-		"ext-pdo-pqsql": "For PostgreSQL databases",
-		"ext-pdo-sqlite": "For SQLite databases"
+		"ext-pdo_pqsql": "For PostgreSQL databases",
+		"ext-pdo_sqlite": "For SQLite databases"
 	},
 	"autoload": {
 		"files": ["medoo.php"]
diff --git a/medoo.php b/medoo.php
index eb8cdc6d..6897f7a3 100644
--- a/medoo.php
+++ b/medoo.php
@@ -2,7 +2,7 @@
 /*!
  * Medoo database framework
  * http://medoo.in
- * Version 0.9.8.3
+ * Version 1.0
  *
  * Copyright 2015, Angel Lai
  * Released under the MIT license
@@ -32,6 +32,8 @@ class medoo
 	// Optional
 	protected $port;
 
+	protected $prefix;
+
 	protected $option = array();
 
 	// Variable
@@ -43,25 +45,19 @@ public function __construct($options = null)
 	{
 		try {
 			$commands = array();
+			$dsn = '';
 
-			if (is_string($options) && !empty($options))
-			{
-				if (strtolower($this->database_type) == 'sqlite')
-				{
-					$this->database_file = $options;
-				}
-				else
-				{
-					$this->database_name = $options;
-				}
-			}
-			elseif (is_array($options))
+			if (is_array($options))
 			{
 				foreach ($options as $option => $value)
 				{
 					$this->$option = $value;
 				}
 			}
+			else
+			{
+				return false;
+			}
 
 			if (
 				isset($this->port) &&
@@ -74,6 +70,11 @@ public function __construct($options = null)
 			$type = strtolower($this->database_type);
 			$is_port = isset($port);
 
+			if (isset($options[ 'prefix' ]))
+			{
+				$this->prefix = $options[ 'prefix' ];
+			}
+
 			switch ($type)
 			{
 				case 'mariadb':
@@ -189,7 +190,7 @@ public function quote($string)
 
 	protected function column_quote($string)
 	{
-		return '"' . str_replace('.', '"."', preg_replace('/(^#|\(JSON\))/', '', $string)) . '"';
+		return '"' . str_replace('.', '"."', preg_replace('/(^#|\(JSON\)\s*)/', '', $string)) . '"';
 	}
 
 	protected function column_push($columns)
@@ -210,9 +211,9 @@ protected function column_push($columns)
 		{
 			preg_match('/([a-zA-Z0-9_\-\.]*)\s*\(([a-zA-Z0-9_\-]*)\)/i', $value, $match);
 
-			if (isset($match[1], $match[2]))
+			if (isset($match[ 1 ], $match[ 2 ]))
 			{
-				array_push($stack, $this->column_quote( $match[1] ) . ' AS ' . $this->column_quote( $match[2] ));
+				array_push($stack, $this->column_quote( $match[ 1 ] ) . ' AS ' . $this->column_quote( $match[ 2 ] ));
 			}
 			else
 			{
@@ -270,17 +271,17 @@ protected function data_implode($data, $conjunctor, $outer_conjunctor = null)
 			)
 			{
 				$wheres[] = 0 !== count(array_diff_key($value, array_keys(array_keys($value)))) ?
-					'(' . $this->data_implode($value, ' ' . $relation_match[1]) . ')' :
-					'(' . $this->inner_conjunct($value, ' ' . $relation_match[1], $conjunctor) . ')';
+					'(' . $this->data_implode($value, ' ' . $relation_match[ 1 ]) . ')' :
+					'(' . $this->inner_conjunct($value, ' ' . $relation_match[ 1 ], $conjunctor) . ')';
 			}
 			else
 			{
-				preg_match('/(#?)([\w\.]+)(\[(\>|\>\=|\<|\<\=|\!|\<\>|\>\<|\!?~)\])?/i', $key, $match);
-				$column = $this->column_quote($match[2]);
+				preg_match('/(#?)([\w\.\-]+)(\[(\>|\>\=|\<|\<\=|\!|\<\>|\>\<|\!?~)\])?/i', $key, $match);
+				$column = $this->column_quote($match[ 2 ]);
 
-				if (isset($match[4]))
+				if (isset($match[ 4 ]))
 				{
-					$operator = $match[4];
+					$operator = $match[ 4 ];
 
 					if ($operator == '!')
 					{
@@ -318,13 +319,13 @@ protected function data_implode($data, $conjunctor, $outer_conjunctor = null)
 								$column .= ' NOT';
 							}
 
-							if (is_numeric($value[0]) && is_numeric($value[1]))
+							if (is_numeric($value[ 0 ]) && is_numeric($value[ 1 ]))
 							{
-								$wheres[] = '(' . $column . ' BETWEEN ' . $value[0] . ' AND ' . $value[1] . ')';
+								$wheres[] = '(' . $column . ' BETWEEN ' . $value[ 0 ] . ' AND ' . $value[ 1 ] . ')';
 							}
 							else
 							{
-								$wheres[] = '(' . $column . ' BETWEEN ' . $this->quote($value[0]) . ' AND ' . $this->quote($value[1]) . ')';
+								$wheres[] = '(' . $column . ' BETWEEN ' . $this->quote($value[ 0 ]) . ' AND ' . $this->quote($value[ 1 ]) . ')';
 							}
 						}
 					}
@@ -342,17 +343,12 @@ protected function data_implode($data, $conjunctor, $outer_conjunctor = null)
 
 							foreach ($value as $item)
 							{
-								if ($operator == '!~')
-								{
-									$column .= ' NOT';
-								}
-
 								if (preg_match('/^(?!%).+(?<!%)$/', $item))
 								{
 									$item = '%' . $item . '%';
 								}
 
-								$like_clauses[] = $column . ' LIKE ' . $this->fn_quote($key, $item);
+								$like_clauses[] = $column . ($operator === '!~' ? ' NOT' : '') . ' LIKE ' . $this->fn_quote($key, $item);
 							}
 
 							$wheres[] = implode(' OR ', $like_clauses);
@@ -429,48 +425,48 @@ protected function where_clause($where)
 			if (!empty($where_AND))
 			{
 				$value = array_values($where_AND);
-				$where_clause = ' WHERE ' . $this->data_implode($where[ $value[0] ], ' AND');
+				$where_clause = ' WHERE ' . $this->data_implode($where[ $value[ 0 ] ], ' AND');
 			}
 
 			if (!empty($where_OR))
 			{
 				$value = array_values($where_OR);
-				$where_clause = ' WHERE ' . $this->data_implode($where[ $value[0] ], ' OR');
+				$where_clause = ' WHERE ' . $this->data_implode($where[ $value[ 0 ] ], ' OR');
 			}
 
-			if (isset($where['MATCH']))
+			if (isset($where[ 'MATCH' ]))
 			{
-				$MATCH = $where['MATCH'];
+				$MATCH = $where[ 'MATCH' ];
 
-				if (is_array($MATCH) && isset($MATCH['columns'], $MATCH['keyword']))
+				if (is_array($MATCH) && isset($MATCH[ 'columns' ], $MATCH[ 'keyword' ]))
 				{
-					$where_clause .= ($where_clause != '' ? ' AND ' : ' WHERE ') . ' MATCH ("' . str_replace('.', '"."', implode($MATCH['columns'], '", "')) . '") AGAINST (' . $this->quote($MATCH['keyword']) . ')';
+					$where_clause .= ($where_clause != '' ? ' AND ' : ' WHERE ') . ' MATCH ("' . str_replace('.', '"."', implode($MATCH[ 'columns' ], '", "')) . '") AGAINST (' . $this->quote($MATCH[ 'keyword' ]) . ')';
 				}
 			}
 
-			if (isset($where['GROUP']))
+			if (isset($where[ 'GROUP' ]))
 			{
-				$where_clause .= ' GROUP BY ' . $this->column_quote($where['GROUP']);
+				$where_clause .= ' GROUP BY ' . $this->column_quote($where[ 'GROUP' ]);
 
-				if (isset($where['HAVING']))
+				if (isset($where[ 'HAVING' ]))
 				{
-					$where_clause .= ' HAVING ' . $this->data_implode($where['HAVING'], ' AND');
+					$where_clause .= ' HAVING ' . $this->data_implode($where[ 'HAVING' ], ' AND');
 				}
 			}
 
-			if (isset($where['ORDER']))
+			if (isset($where[ 'ORDER' ]))
 			{
 				$rsort = '/(^[a-zA-Z0-9_\-\.]*)(\s*(DESC|ASC))?/';
-				$ORDER = $where['ORDER'];
+				$ORDER = $where[ 'ORDER' ];
 
 				if (is_array($ORDER))
 				{
 					if (
-						isset($ORDER[1]) &&
-						is_array($ORDER[1])
+						isset($ORDER[ 1 ]) &&
+						is_array($ORDER[ 1 ])
 					)
 					{
-						$where_clause .= ' ORDER BY FIELD(' . $this->column_quote($ORDER[0]) . ', ' . $this->array_quote($ORDER[1]) . ')';
+						$where_clause .= ' ORDER BY FIELD(' . $this->column_quote($ORDER[ 0 ]) . ', ' . $this->array_quote($ORDER[ 1 ]) . ')';
 					}
 					else
 					{
@@ -480,7 +476,7 @@ protected function where_clause($where)
 						{
 							preg_match($rsort, $column, $order_match);
 
-							array_push($stack, '"' . str_replace('.', '"."', $order_match[1]) . '"' . (isset($order_match[3]) ? ' ' . $order_match[3] : ''));
+							array_push($stack, '"' . str_replace('.', '"."', $order_match[ 1 ]) . '"' . (isset($order_match[ 3 ]) ? ' ' . $order_match[ 3 ] : ''));
 						}
 
 						$where_clause .= ' ORDER BY ' . implode($stack, ',');
@@ -490,13 +486,13 @@ protected function where_clause($where)
 				{
 					preg_match($rsort, $ORDER, $order_match);
 
-					$where_clause .= ' ORDER BY "' . str_replace('.', '"."', $order_match[1]) . '"' . (isset($order_match[3]) ? ' ' . $order_match[3] : '');
+					$where_clause .= ' ORDER BY "' . str_replace('.', '"."', $order_match[ 1 ]) . '"' . (isset($order_match[ 3 ]) ? ' ' . $order_match[ 3 ] : '');
 				}
 			}
 
-			if (isset($where['LIMIT']))
+			if (isset($where[ 'LIMIT' ]))
 			{
-				$LIMIT = $where['LIMIT'];
+				$LIMIT = $where[ 'LIMIT' ];
 
 				if (is_numeric($LIMIT))
 				{
@@ -505,17 +501,17 @@ protected function where_clause($where)
 
 				if (
 					is_array($LIMIT) &&
-					is_numeric($LIMIT[0]) &&
-					is_numeric($LIMIT[1])
+					is_numeric($LIMIT[ 0 ]) &&
+					is_numeric($LIMIT[ 1 ])
 				)
 				{
 					if ($this->database_type === 'pgsql')
 					{
-						$where_clause .= ' OFFSET ' . $LIMIT[0] . ' LIMIT ' . $LIMIT[1];
+						$where_clause .= ' OFFSET ' . $LIMIT[ 0 ] . ' LIMIT ' . $LIMIT[ 1 ];
 					}
 					else
 					{
-						$where_clause .= ' LIMIT ' . $LIMIT[0] . ',' . $LIMIT[1];
+						$where_clause .= ' LIMIT ' . $LIMIT[ 0 ] . ',' . $LIMIT[ 1 ];
 					}
 				}
 			}
@@ -533,12 +529,12 @@ protected function where_clause($where)
 
 	protected function select_context($table, $join, &$columns = null, $where = null, $column_fn = null)
 	{
-		$table = '"' . $table . '"';
+		$table = '"' . $this->prefix . $table . '"';
 		$join_key = is_array($join) ? array_keys($join) : null;
 
 		if (
-			isset($join_key[0]) &&
-			strpos($join_key[0], '[') === 0
+			isset($join_key[ 0 ]) &&
+			strpos($join_key[ 0 ], '[') === 0
 		)
 		{
 			$table_join = array();
@@ -554,7 +550,7 @@ protected function select_context($table, $join, &$columns = null, $where = null
 			{
 				preg_match('/(\[(\<|\>|\>\<|\<\>)\])?([a-zA-Z0-9_\-]*)\s?(\(([a-zA-Z0-9_\-]*)\))?/', $sub_table, $match);
 
-				if ($match[2] != '' && $match[3] != '')
+				if ($match[ 2 ] != '' && $match[ 3 ] != '')
 				{
 					if (is_string($relation))
 					{
@@ -564,7 +560,7 @@ protected function select_context($table, $join, &$columns = null, $where = null
 					if (is_array($relation))
 					{
 						// For ['column1', 'column2']
-						if (isset($relation[0]))
+						if (isset($relation[ 0 ]))
 						{
 							$relation = 'USING ("' . implode($relation, '", "') . '")';
 						}
@@ -583,14 +579,14 @@ protected function select_context($table, $join, &$columns = null, $where = null
 										$table . '."' . $key . '"'
 								) .
 								' = ' .
-								'"' . (isset($match[5]) ? $match[5] : $match[3]) . '"."' . $value . '"';
+								'"' . (isset($match[ 5 ]) ? $match[ 5 ] : $match[ 3 ]) . '"."' . $value . '"';
 							}
 
 							$relation = 'ON ' . implode($joins, ' AND ');
 						}
 					}
 
-					$table_join[] = $join_array[ $match[2] ] . ' JOIN "' . $match[3] . '" ' . (isset($match[5]) ?  'AS "' . $match[5] . '" ' : '') . $relation;
+					$table_join[] = $join_array[ $match[ 2 ] ] . ' JOIN "' . $match[ 3 ] . '" ' . (isset($match[ 5 ]) ?  'AS "' . $match[ 5 ] . '" ' : '') . $relation;
 				}
 			}
 
@@ -673,7 +669,7 @@ public function insert($table, $datas)
 		$lastId = array();
 
 		// Check indexed or associative array
-		if (!isset($datas[0]))
+		if (!isset($datas[ 0 ]))
 		{
 			$datas = array($datas);
 		}
@@ -696,7 +692,7 @@ public function insert($table, $datas)
 					case 'array':
 						preg_match("/\(JSON\)\s*([\w]+)/i", $key, $column_match);
 
-						$values[] = isset($column_match[0]) ?
+						$values[] = isset($column_match[ 0 ]) ?
 							$this->quote(json_encode($value)) :
 							$this->quote(serialize($value));
 						break;
@@ -713,7 +709,7 @@ public function insert($table, $datas)
 				}
 			}
 
-			$this->exec('INSERT INTO "' . $table . '" (' . implode(', ', $columns) . ') VALUES (' . implode($values, ', ') . ')');
+			$this->exec('INSERT INTO "' . $this->prefix . $table . '" (' . implode(', ', $columns) . ') VALUES (' . implode($values, ', ') . ')');
 
 			$lastId[] = $this->pdo->lastInsertId();
 		}
@@ -729,11 +725,11 @@ public function update($table, $data, $where = null)
 		{
 			preg_match('/([\w]+)(\[(\+|\-|\*|\/)\])?/i', $key, $match);
 
-			if (isset($match[3]))
+			if (isset($match[ 3 ]))
 			{
 				if (is_numeric($value))
 				{
-					$fields[] = $this->column_quote($match[1]) . ' = ' . $this->column_quote($match[1]) . ' ' . $match[3] . ' ' . $value;
+					$fields[] = $this->column_quote($match[ 1 ]) . ' = ' . $this->column_quote($match[ 1 ]) . ' ' . $match[ 3 ] . ' ' . $value;
 				}
 			}
 			else
@@ -750,7 +746,7 @@ public function update($table, $data, $where = null)
 						preg_match("/\(JSON\)\s*([\w]+)/i", $key, $column_match);
 
 						$fields[] = $column . ' = ' . $this->quote(
-								isset($column_match[0]) ? json_encode($value) : serialize($value)
+								isset($column_match[ 0 ]) ? json_encode($value) : serialize($value)
 							);
 						break;
 
@@ -767,12 +763,12 @@ public function update($table, $data, $where = null)
 			}
 		}
 
-		return $this->exec('UPDATE "' . $table . '" SET ' . implode(', ', $fields) . $this->where_clause($where));
+		return $this->exec('UPDATE "' . $this->prefix . $table . '" SET ' . implode(', ', $fields) . $this->where_clause($where));
 	}
 
 	public function delete($table, $where)
 	{
-		return $this->exec('DELETE FROM "' . $table . '"' . $this->where_clause($where));
+		return $this->exec('DELETE FROM "' . $this->prefix . $table . '"' . $this->where_clause($where));
 	}
 
 	public function replace($table, $columns, $search = null, $replace = null, $where = null)
@@ -812,7 +808,7 @@ public function replace($table, $columns, $search = null, $replace = null, $wher
 			}
 		}
 
-		return $this->exec('UPDATE "' . $table . '" SET ' . $replace_query . $this->where_clause($where));
+		return $this->exec('UPDATE "' . $this->prefix . $table . '" SET ' . $replace_query . $this->where_clause($where));
 	}
 
 	public function get($table, $join = null, $column = null, $where = null)
@@ -823,7 +819,7 @@ public function get($table, $join = null, $column = null, $where = null)
 		{
 			$data = $query->fetchAll(PDO::FETCH_ASSOC);
 
-			if (isset($data[0]))
+			if (isset($data[ 0 ]))
 			{
 				$column = $where == null ? $join : $column;
 
@@ -907,6 +903,29 @@ public function sum($table, $join, $column = null, $where = null)
 		return $query ? 0 + $query->fetchColumn() : false;
 	}
 
+	public function action($actions)
+	{
+		if (is_callable($actions))
+		{
+			$this->pdo->beginTransaction();
+
+			$result = $actions($this);
+
+			if ($result === false)
+			{
+				$this->pdo->rollBack();
+			}
+			else
+			{
+				$this->pdo->commit();
+			}
+		}
+		else
+		{
+			return false;
+		}
+	}
+
 	public function debug()
 	{
 		$this->debug_mode = true;