diff --git a/library/think/Template.php b/library/think/Template.php
index 02cd504b..9ba0ff35 100644
--- a/library/think/Template.php
+++ b/library/think/Template.php
@@ -64,14 +64,16 @@ class Template
      */
     public function __construct(array $config = [])
     {
-        $this->config['cache_path']          = TEMP_PATH;
-        $this->config                        = array_merge($this->config, $config);
+        $this->config['cache_path'] = TEMP_PATH;
+        $this->config               = array_merge($this->config, $config);
+
         $this->config['taglib_begin_origin'] = $this->config['taglib_begin'];
         $this->config['taglib_end_origin']   = $this->config['taglib_end'];
-        $this->config['taglib_begin']        = $this->stripPreg($this->config['taglib_begin']);
-        $this->config['taglib_end']          = $this->stripPreg($this->config['taglib_end']);
-        $this->config['tpl_begin']           = $this->stripPreg($this->config['tpl_begin']);
-        $this->config['tpl_end']             = $this->stripPreg($this->config['tpl_end']);
+
+        $this->config['taglib_begin'] = preg_quote($this->config['taglib_begin'], '/');
+        $this->config['taglib_end']   = preg_quote($this->config['taglib_end'], '/');
+        $this->config['tpl_begin']    = preg_quote($this->config['tpl_begin'], '/');
+        $this->config['tpl_end']      = preg_quote($this->config['tpl_end'], '/');
 
         // 初始化模板编译存储器
         $type          = $this->config['compile_type'] ? $this->config['compile_type'] : 'File';
@@ -79,20 +81,6 @@ class Template
         $this->storage = new $class();
     }
 
-    /**
-     * 字符串替换 避免正则混淆
-     * @access private
-     * @param string $str
-     * @return string
-     */
-    private function stripPreg($str)
-    {
-        return str_replace(
-            ['{', '}', '(', ')', '|', '[', ']', '-', '+', '*', '.', '^', '?'],
-            ['\{', '\}', '\(', '\)', '\|', '\[', '\]', '\-', '\+', '\*', '\.', '\^', '\?'],
-            $str);
-    }
-
     /**
      * 模板变量赋值
      * @access public
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index d425d78a..53aa71b5 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -403,7 +403,7 @@ class Query
             if (empty($this->options['table'])) {
                 $this->options['table'] = $this->getTable();
             }
-            $key    = is_string($cache['key']) ? $cache['key'] : md5($field . serialize($this->options) . serialize($this->bind));
+            $key    = is_string($cache['key']) ? $cache['key'] : md5($this->connection->getConfig('database') . '.' . $field . serialize($this->options) . serialize($this->bind));
             $result = Cache::get($key);
         }
         if (false === $result) {
@@ -447,7 +447,7 @@ class Query
             if (empty($this->options['table'])) {
                 $this->options['table'] = $this->getTable();
             }
-            $guid   = is_string($cache['key']) ? $cache['key'] : md5($field . serialize($this->options) . serialize($this->bind));
+            $guid   = is_string($cache['key']) ? $cache['key'] : md5($this->connection->getConfig('database') . '.' . $field . serialize($this->options) . serialize($this->bind));
             $result = Cache::get($guid);
         }
         if (false === $result) {
@@ -793,7 +793,7 @@ class Query
         }
 
         if (isset($this->options['field'])) {
-            $field = array_merge($this->options['field'], $field);
+            $field = array_merge((array) $this->options['field'], $field);
         }
         $this->options['field'] = array_unique($field);
         return $this;
@@ -2322,7 +2322,7 @@ class Query
             // 判断查询缓存
             $cache = $options['cache'];
             unset($options['cache']);
-            $key       = is_string($cache['key']) ? $cache['key'] : md5(serialize($options) . serialize($this->bind));
+            $key       = is_string($cache['key']) ? $cache['key'] : md5($this->connection->getConfig('database') . '.' . serialize($options) . serialize($this->bind));
             $resultSet = Cache::get($key);
         }
         if (false === $resultSet) {
@@ -2423,10 +2423,12 @@ class Query
         } elseif (is_array($value) && is_string($value[0]) && 'eq' == strtolower($value[0])) {
             $data = $value[1];
         }
+        $prefix = $this->connection->getConfig('database') . '.';
+
         if (isset($data)) {
-            return 'think:' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
+            return 'think:' . $prefix . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
         } else {
-            return md5(serialize($options) . serialize($bind));
+            return md5($prefix . serialize($options) . serialize($bind));
         }
     }
 
@@ -2463,11 +2465,11 @@ class Query
             // 判断查询缓存
             $cache = $options['cache'];
             if (true === $cache['key'] && !is_null($data) && !is_array($data)) {
-                $key = 'think:' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
+                $key = 'think:' . $this->connection->getConfig('database') . '.' . (is_array($options['table']) ? key($options['table']) : $options['table']) . '|' . $data;
             } elseif (is_string($cache['key'])) {
                 $key = $cache['key'];
             } elseif (!isset($key)) {
-                $key = md5(serialize($options) . serialize($this->bind));
+                $key = md5($this->connection->getConfig('database') . '.' . serialize($options) . serialize($this->bind));
             }
             $result = Cache::get($key);
         }
diff --git a/library/think/model/relation/BelongsTo.php b/library/think/model/relation/BelongsTo.php
index dfd61147..e609a876 100644
--- a/library/think/model/relation/BelongsTo.php
+++ b/library/think/model/relation/BelongsTo.php
@@ -128,6 +128,7 @@ class BelongsTo extends OneToOne
         }
 
         if (!empty($range)) {
+            $this->query->removeWhereField($localKey);
             $data = $this->eagerlyWhere($this->query, [
                 $localKey => [
                     'in',
@@ -171,7 +172,8 @@ class BelongsTo extends OneToOne
     {
         $localKey   = $this->localKey;
         $foreignKey = $this->foreignKey;
-        $data       = $this->eagerlyWhere($this->query, [$localKey => $result->$foreignKey], $localKey, $relation, $subRelation, $closure);
+        $this->query->removeWhereField($localKey);
+        $data = $this->eagerlyWhere($this->query, [$localKey => $result->$foreignKey], $localKey, $relation, $subRelation, $closure);
         // 关联模型
         if (!isset($data[$result->$foreignKey])) {
             $relationModel = null;
@@ -220,4 +222,21 @@ class BelongsTo extends OneToOne
 
         return $this->parent->setRelation($this->relation, null);
     }
+
+    /**
+     * 执行基础查询（仅执行一次）
+     * @access protected
+     * @return void
+     */
+    protected function baseQuery()
+    {
+        if (empty($this->baseQuery)) {
+            if (isset($this->parent->{$this->foreignKey})) {
+                // 关联查询带入关联条件
+                $this->query->where($this->localKey, '=', $this->parent->{$this->foreignKey});
+            }
+
+            $this->baseQuery = true;
+        }
+    }
 }
diff --git a/library/think/model/relation/HasOne.php b/library/think/model/relation/HasOne.php
index f64f133f..3c036c01 100644
--- a/library/think/model/relation/HasOne.php
+++ b/library/think/model/relation/HasOne.php
@@ -130,7 +130,8 @@ class HasOne extends OneToOne
         }
 
         if (!empty($range)) {
-            $data = $this->eagerlyWhere($this, [
+            $this->query->removeWhereField($foreignKey);
+            $data = $this->eagerlyWhere($this->query, [
                 $foreignKey => [
                     'in',
                     $range,
@@ -172,7 +173,8 @@ class HasOne extends OneToOne
     {
         $localKey   = $this->localKey;
         $foreignKey = $this->foreignKey;
-        $data       = $this->eagerlyWhere($this, [$foreignKey => $result->$localKey], $foreignKey, $relation, $subRelation, $closure);
+        $this->query->removeWhereField($foreignKey);
+        $data = $this->eagerlyWhere($this->query, [$foreignKey => $result->$localKey], $foreignKey, $relation, $subRelation, $closure);
 
         // 关联模型
         if (!isset($data[$result->$localKey])) {
@@ -190,4 +192,20 @@ class HasOne extends OneToOne
         }
     }
 
+    /**
+     * 执行基础查询（仅执行一次）
+     * @access protected
+     * @return void
+     */
+    protected function baseQuery()
+    {
+        if (empty($this->baseQuery)) {
+            if (isset($this->parent->{$this->localKey})) {
+                // 关联查询带入关联条件
+                $this->query->where($this->foreignKey, '=', $this->parent->{$this->localKey});
+            }
+
+            $this->baseQuery = true;
+        }
+    }
 }
diff --git a/library/think/model/relation/OneToOne.php b/library/think/model/relation/OneToOne.php
index 02d7d563..dd8595c9 100644
--- a/library/think/model/relation/OneToOne.php
+++ b/library/think/model/relation/OneToOne.php
@@ -304,6 +304,8 @@ abstract class OneToOne extends Relation
      */
     protected function eagerlyWhere($model, $where, $key, $relation, $subRelation = '', $closure = false)
     {
+        $this->baseQuery = true;
+
         // 预载入关联查询 支持嵌套预载入
         if ($closure) {
             call_user_func_array($closure, [ & $model]);