diff --git a/library/think/db/Driver.php b/library/think/db/Driver.php
index b52d1a29..b159ad2d 100644
--- a/library/think/db/Driver.php
+++ b/library/think/db/Driver.php
@@ -41,22 +41,23 @@ abstract class Driver
     protected $_linkID = null;
     // 数据库连接参数配置
     protected $config = [
-        'type'           => '', // 数据库类型
-        'hostname'       => '127.0.0.1', // 服务器地址
-        'database'       => '', // 数据库名
-        'username'       => '', // 用户名
-        'password'       => '', // 密码
-        'hostport'       => '', // 端口
-        'dsn'            => '', //
-        'params'         => [], // 数据库连接参数
-        'charset'        => 'utf8', // 数据库编码默认采用utf8
-        'prefix'         => '', // 数据库表前缀
-        'debug'          => false, // 数据库调试模式
-        'deploy'         => 0, // 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)
-        'rw_separate'    => false, // 数据库读写是否分离 主从式有效
-        'master_num'     => 1, // 读写分离后 主服务器数量
-        'slave_no'       => '', // 指定从服务器序号
-        'db_like_fields' => '', //like字段自动替换为%%包裹
+        'type'           => '',             // 数据库类型
+        'hostname'       => '127.0.0.1',    // 服务器地址
+        'database'       => '',             // 数据库名
+        'username'       => '',             // 用户名
+        'password'       => '',             // 密码
+        'hostport'       => '',             // 端口
+        'dsn'            => '',             //
+        'params'         => [],             // 数据库连接参数
+        'charset'        => 'utf8',         // 数据库编码默认采用utf8
+        'prefix'         => '',             // 数据库表前缀
+        'debug'          => false,          // 数据库调试模式
+        'deploy'         => 0,              // 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)
+        'rw_separate'    => false,          // 数据库读写是否分离 主从式有效
+        'master_num'     => 1,              // 读写分离后 主服务器数量
+        'slave_no'       => '',             // 指定从服务器序号
+        'db_like_fields' => '',             // like字段自动替换为%%包裹
+        'debug'          => false,          // 是否调试
     ];
     // 数据库表达式
     protected $exp = ['eq' => '=', 'neq' => '<>', 'gt' => '>', 'egt' => '>=', 'lt' => '<', 'elt' => '<=', 'notlike' => 'NOT LIKE', 'like' => 'LIKE', 'in' => 'IN', 'notin' => 'NOT IN', 'not in' => 'NOT IN', 'between' => 'BETWEEN', 'not between' => 'NOT BETWEEN', 'notbetween' => 'NOT BETWEEN'];
diff --git a/library/think/db/driver/Mongo.php b/library/think/db/driver/Mongo.php
index b343d66b..0335035d 100644
--- a/library/think/db/driver/Mongo.php
+++ b/library/think/db/driver/Mongo.php
@@ -48,7 +48,6 @@ class Mongo extends Driver
                 $this->config['params'] = [];
             }
         }
-        $this->config = $config;
     }
 
     /**
@@ -105,7 +104,7 @@ class Mongo extends Driver
                 $this->_mongo  = $this->_linkID->selectDb($db);
             }
             // 当前MongoCollection对象
-            if (!empty($this->config['debug'])) {
+            if ($this->config['debug']) {
                 $this->queryStr = $this->_dbName . '.getCollection(' . $collection . ')';
             }
             if ($this->_collectionName != $collection) {
@@ -217,7 +216,7 @@ class Mongo extends Driver
         }
         $this->model = $options['model'];
         $this->executeTimes++;
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.insert(';
             $this->queryStr .= $data ? json_encode($data) : '{}';
             $this->queryStr .= ')';
@@ -277,7 +276,7 @@ class Mongo extends Driver
      */
     public function getMongoNextId($pk)
     {
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.find({},{' . $pk . ':1}).sort({' . $pk . ':-1}).limit(1)';
         }
         try {
@@ -310,7 +309,7 @@ class Mongo extends Driver
         $this->model = $options['model'];
         $query       = $this->parseWhere($options['where']);
         $set         = $this->parseSet($data);
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.update(';
             $this->queryStr .= $query ? json_encode($query) : '{}';
             $this->queryStr .= ',' . json_encode($set) . ')';
@@ -344,7 +343,7 @@ class Mongo extends Driver
         $query       = $this->parseWhere($options['where']);
         $this->model = $options['model'];
         $this->executeTimes++;
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.remove(' . json_encode($query) . ')';
         }
         try {
@@ -370,7 +369,7 @@ class Mongo extends Driver
         }
         $this->model = $options['model'];
         $this->executeTimes++;
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.remove({})';
         }
         try {
@@ -405,10 +404,10 @@ class Mongo extends Driver
         }
         $this->model = $options['model'];
         $this->queryTimes++;
-        $query = $this->parseWhere(!empty($options['where']) ? $options['where'] : '');
+        $query = $this->parseWhere(!empty($options['where']) ? $options['where'] : array());
         $field = $this->parseField(!empty($options['field']) ? $options['field'] : '');
         try {
-            if (!empty($this->config['debug'])) {
+            if ($this->config['debug']) {
                 $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.find(';
                 $this->queryStr .= $query ? json_encode($query) : '{}';
                 $this->queryStr .= $field ? ',' . json_encode($field) : '';
@@ -418,7 +417,7 @@ class Mongo extends Driver
             $_cursor = $this->_collection->find($query, $field);
             if ($options['order']) {
                 $order = $this->parseOrder($options['order']);
-                if (!empty($this->config['debug'])) {
+                if ($this->config['debug']) {
                     $this->queryStr .= '.sort(' . json_encode($order) . ')';
                 }
                 $_cursor = $_cursor->sort($order);
@@ -438,12 +437,12 @@ class Mongo extends Driver
             if (isset($options['limit'])) {
                 list($offset, $length) = $this->parseLimit($options['limit']);
                 if (!empty($offset)) {
-                    if (!empty($this->config['debug'])) {
+                    if ($this->config['debug']) {
                         $this->queryStr .= '.skip(' . intval($offset) . ')';
                     }
                     $_cursor = $_cursor->skip(intval($offset));
                 }
-                if (!empty($this->config['debug'])) {
+                if ($this->config['debug']) {
                     $this->queryStr .= '.limit(' . intval($length) . ')';
                 }
                 $_cursor = $_cursor->limit(intval($length));
@@ -485,7 +484,7 @@ class Mongo extends Driver
         $this->queryTimes++;
         $query  = $this->parseWhere(!empty($options['where'])?$options['where']:'');
         $fields = $this->parseField(!empty($options['field'])?$options['field']:'');
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.findOne(';
             $this->queryStr .= $query ? json_encode($query) : '{}';
             $this->queryStr .= $fields ? ',' . json_encode($fields) : '';
@@ -519,7 +518,7 @@ class Mongo extends Driver
         $this->model = $options['model'];
         $this->queryTimes++;
         $query = $this->parseWhere($options['where']);
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName;
             $this->queryStr .= $query ? '.find(' . json_encode($query) . ')' : '';
             $this->queryStr .= '.count()';
@@ -550,7 +549,7 @@ class Mongo extends Driver
             $this->switchCollection($collection, '', false);
         }
         $this->queryTimes++;
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.' . $this->_collectionName . '.findOne()';
         }
         try {
@@ -581,7 +580,7 @@ class Mongo extends Driver
      */
     public function getTables()
     {
-        if (!empty($this->config['debug'])) {
+        if ($this->config['debug']) {
             $this->queryStr = $this->_dbName . '.getCollenctionNames()';
         }
         $this->queryTimes++;