diff --git a/src/AbstractRedisConnection.php b/src/AbstractRedisConnection.php
index 2706fbd..a9784f0 100644
--- a/src/AbstractRedisConnection.php
+++ b/src/AbstractRedisConnection.php
@@ -88,6 +88,10 @@ protected function initRedis()
             $error = sprintf('Redis connection authentication failed host=%s port=%d auth=%s', $host, (int)$port, (string)$config['auth']);
             throw new RedisException($error);
         }
+        if (isset($config['database']) && $config['database'] < 16 && false === $redis->select($config['database'])) {
+            $error = sprintf('Redis selection database failure host=%s port=%d database=%d', $host, (int)$port, (int)$config['database']);
+            throw new RedisException($error);
+        }
 
         return $redis;
     }
diff --git a/src/Operator/Hashes/HashGetAll.php b/src/Operator/Hashes/HashGetAll.php
index c9abbfd..8de686a 100644
--- a/src/Operator/Hashes/HashGetAll.php
+++ b/src/Operator/Hashes/HashGetAll.php
@@ -21,11 +21,8 @@ public function getId()
      */
     public function parseResponse($data)
     {
-        if ($data === false) {
-            return false;
-        }
+        $result = array();
 
-        $result = [];
         for ($i = 0; $i < count($data); ++$i) {
             $result[$data[$i]] = $data[++$i];
         }
diff --git a/src/Operator/Hashes/HashGetMultiple.php b/src/Operator/Hashes/HashGetMultiple.php
index b44c263..818933a 100644
--- a/src/Operator/Hashes/HashGetMultiple.php
+++ b/src/Operator/Hashes/HashGetMultiple.php
@@ -21,14 +21,10 @@ public function getId()
      */
     public function parseResponse($data)
     {
-        if ($data === false) {
-            return false;
-        }
-
         $result = [];
         $hashKeys = $this->getArgument(1);
         foreach ($data as $key => $value) {
-            if (!isset($hashKeys[$key])) {
+            if (! isset($hashKeys[$key])) {
                 continue;
             }
 
diff --git a/src/Operator/Keys/KeyPreciseExpire.php b/src/Operator/Keys/KeyPreciseExpire.php
index fc0033b..0e9bc59 100644
--- a/src/Operator/Keys/KeyPreciseExpire.php
+++ b/src/Operator/Keys/KeyPreciseExpire.php
@@ -7,12 +7,12 @@
 class KeyPreciseExpire extends Command
 {
     /**
-     * [Keys] pexpire
+     * [Keys] pexipre
      *
      * @return string
      */
     public function getId()
     {
-        return 'pexpire';
+        return 'pexipre';
     }
 }
diff --git a/src/Operator/Processor/PrefixProcessor.php b/src/Operator/Processor/PrefixProcessor.php
index 6c0ea01..940cd12 100644
--- a/src/Operator/Processor/PrefixProcessor.php
+++ b/src/Operator/Processor/PrefixProcessor.php
@@ -95,7 +95,6 @@ public function init()
             'ZADD'             => 'static::first',
             'ZINCRBY'          => 'static::first',
             'ZREM'             => 'static::first',
-            'ZDELETE'          => 'static::first',
             'ZRANGE'           => 'static::first',
             'ZREVRANGE'        => 'static::first',
             'ZRANGEBYSCORE'    => 'static::first',
diff --git a/src/Pool/RedisPool.php b/src/Pool/RedisPool.php
index 96c2bf2..14bb74a 100644
--- a/src/Pool/RedisPool.php
+++ b/src/Pool/RedisPool.php
@@ -39,6 +39,9 @@ public function createConnection(): ConnectionInterface
             $redis = new SyncRedisConnection($this);
         }
 
+        $dbIndex = $this->poolConfig->getDb();
+        $redis->select($dbIndex);
+
         return $redis;
     }
 }
diff --git a/src/RedisConnection.php b/src/RedisConnection.php
index e088de3..a2a5aa4 100644
--- a/src/RedisConnection.php
+++ b/src/RedisConnection.php
@@ -33,10 +33,6 @@ public function createConnection()
     {
         $redis            = $this->initRedis();
         $this->connection = $redis;
-
-        /** @var RedisPoolConfig $config */
-        $config = $this->getPool()->getPoolConfig();
-        $redis->select($config->getDb());
     }
 
     /**
diff --git a/src/SyncRedisConnection.php b/src/SyncRedisConnection.php
index 90c5290..827db2c 100644
--- a/src/SyncRedisConnection.php
+++ b/src/SyncRedisConnection.php
@@ -39,10 +39,6 @@ public function createConnection()
             $redis->setOption(\Redis::OPT_PREFIX, $prefix);
         }
         $this->connection = $redis;
-
-        /** @var RedisPoolConfig $config */
-        $config = $this->getPool()->getPoolConfig();
-        $redis->select($config->getDb());
     }
 
     /**
diff --git a/test/Cases/HashTest.php b/test/Cases/HashTest.php
index 0f4d881..62254dd 100644
--- a/test/Cases/HashTest.php
+++ b/test/Cases/HashTest.php
@@ -26,18 +26,6 @@ public function testHmsetAndHmget()
         ];
         $values = $this->redis->hMGet($key, ['NotExistKey', 'NotExistKey2']);
         $this->assertEquals($data, $values);
-
-        $this->redis->set($key, 'xxxxx');
-        $result = $this->redis->hMGet($key,['key']);
-        $this->assertFalse($result);
-
-        $this->redis->delete($key);
-        $result = $this->redis->hMGet($key, ['key']);
-        $this->assertEquals(['key' => false], $result);
-
-        $this->redis->sAdd($key, 'xxxxx');
-        $result = $this->redis->hMGet($key, ['key']);
-        $this->assertFalse($result);
     }
 
     public function testHmsetAndHmgetByCo()
@@ -55,18 +43,6 @@ public function testHGetAll()
 
         $result = $this->redis->hGetAll($key);
         $this->assertEquals(['key' => 'value', 'key2' => 'value2', 'key3' => 'value3'], $result);
-
-        $this->redis->set($key, 'xxxxx');
-        $result = $this->redis->hGetAll($key);
-        $this->assertFalse($result);
-
-        $this->redis->delete($key);
-        $result = $this->redis->hGetAll($key);
-        $this->assertEquals([], $result);
-
-        $this->redis->sAdd($key, 'xxxxx');
-        $result = $this->redis->hGetAll($key);
-        $this->assertFalse($result);
     }
 
     public function testHGetAllByCo()
diff --git a/test/Cases/PoolTest.php b/test/Cases/PoolTest.php
index 5a83516..a72a8cb 100644
--- a/test/Cases/PoolTest.php
+++ b/test/Cases/PoolTest.php
@@ -4,7 +4,6 @@
 
 use Swoft\App;
 use Swoft\Redis\Exception\RedisException;
-use Swoft\Redis\Redis;
 use SwoftTest\Redis\Pool\RedisEnvPoolConfig;
 use SwoftTest\Redis\Pool\RedisPptPoolConfig;
 use SwoftTest\Redis\Testing\Clients\TimeoutRedis;
@@ -74,16 +73,4 @@ public function testRedisTimeout()
         });
 
     }
-
-    public function testRedisReconnectSelectDb()
-    {
-        $redis = bean(Redis::class);
-        $redis->set('test_select_db', 1);
-
-        $redis->reconnect();
-
-        $res = $redis->get('test_select_db');
-
-        $this->assertEquals(1, $res);
-    }
 }
\ No newline at end of file