feat: 本次提交更新内容如下

php有问题，覆盖下

Server/thinkphp/library/think/db/connector/Sqlsrv.php

@@ -13,6 +13,7 @@ namespace think\db\connector;
 
 use PDO;
 use think\db\Connection;
+use think\db\Query;
 
 /**
  * Sqlsrv数据库驱动
@@ -23,28 +24,33 @@ class Sqlsrv extends Connection
     protected $params = [
         PDO::ATTR_CASE              => PDO::CASE_NATURAL,
         PDO::ATTR_ERRMODE           => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_ORACLE_NULLS      => PDO::NULL_NATURAL,
         PDO::ATTR_STRINGIFY_FETCHES => false,
     ];
+
     protected $builder = '\\think\\db\\builder\\Sqlsrv';
+
     /**
      * 解析pdo连接的dsn信息
      * @access protected
-     * @param array $config 连接信息
+     * @param  array $config 连接信息
      * @return string
      */
     protected function parseDsn($config)
     {
         $dsn = 'sqlsrv:Database=' . $config['database'] . ';Server=' . $config['hostname'];
+
         if (!empty($config['hostport'])) {
             $dsn .= ',' . $config['hostport'];
         }
+
         return $dsn;
     }
 
     /**
      * 取得数据表的字段信息
      * @access public
-     * @param string $tableName
+     * @param  string $tableName
      * @return array
      */
     public function getFields($tableName)
@@ -64,6 +70,7 @@ class Sqlsrv extends Connection
         $pdo    = $this->query($sql, [], false, true);
         $result = $pdo->fetchAll(PDO::FETCH_ASSOC);
         $info   = [];
+
         if ($result) {
             foreach ($result as $key => $val) {
                 $val                       = array_change_key_case($val);
@@ -77,23 +84,30 @@ class Sqlsrv extends Connection
                 ];
             }
         }
+
         $sql = "SELECT column_name FROM information_schema.key_column_usage WHERE table_name='$tableName'";
+
         // 调试开始
         $this->debug(true);
+
         $pdo = $this->linkID->query($sql);
+
         // 调试结束
         $this->debug(false, $sql);
+
         $result = $pdo->fetch(PDO::FETCH_ASSOC);
+
         if ($result) {
             $info[$result['column_name']]['primary'] = true;
         }
+
         return $this->fieldCase($info);
     }
 
     /**
      * 取得数据表的字段信息
      * @access public
-     * @param string $dbName
+     * @param  string $dbName
      * @return array
      */
     public function getTables($dbName = '')
@@ -106,16 +120,112 @@ class Sqlsrv extends Connection
         $pdo    = $this->query($sql, [], false, true);
         $result = $pdo->fetchAll(PDO::FETCH_ASSOC);
         $info   = [];
+
         foreach ($result as $key => $val) {
             $info[$key] = current($val);
         }
+
         return $info;
     }
 
+    /**
+     * 得到某个列的数组
+     * @access public
+     * @param  Query     $query 查询对象
+     * @param  string    $field 字段名 多个字段用逗号分隔
+     * @param  string    $key   索引
+     * @return array
+     */
+    public function column(Query $query, $field, $key = '')
+    {
+        $options = $query->getOptions();
+
+        if (empty($options['fetch_sql']) && !empty($options['cache'])) {
+            // 判断查询缓存
+            $cache = $options['cache'];
+
+            $guid = is_string($cache['key']) ? $cache['key'] : $this->getCacheKey($query, $field);
+
+            $result = Container::get('cache')->get($guid);
+
+            if (false !== $result) {
+                return $result;
+            }
+        }
+
+        if (isset($options['field'])) {
+            $query->removeOption('field');
+        }
+
+        if (is_null($field)) {
+            $field = '*';
+        } elseif ($key && '*' != $field) {
+            $field = $key . ',' . $field;
+        }
+
+        if (is_string($field)) {
+            $field = array_map('trim', explode(',', $field));
+        }
+
+        $query->setOption('field', $field);
+
+        // 生成查询SQL
+        $sql = $this->builder->select($query);
+
+        $bind = $query->getBind();
+
+        if (!empty($options['fetch_sql'])) {
+            // 获取实际执行的SQL语句
+            return $this->getRealSql($sql, $bind);
+        }
+
+        // 执行查询操作
+        $pdo = $this->query($sql, $bind, $options['master'], true);
+
+        if (1 == $pdo->columnCount()) {
+            $result = $pdo->fetchAll(PDO::FETCH_COLUMN);
+        } else {
+            $resultSet = $pdo->fetchAll(PDO::FETCH_ASSOC);
+
+            if ('*' == $field && $key) {
+                $result = array_column($resultSet, null, $key);
+            } elseif ($resultSet) {
+                $fields = array_keys($resultSet[0]);
+                $count  = count($fields);
+                $key1   = array_shift($fields);
+                $key2   = $fields ? array_shift($fields) : '';
+                $key    = $key ?: $key1;
+
+                if (strpos($key, '.')) {
+                    list($alias, $key) = explode('.', $key);
+                }
+
+                if (3 == $count) {
+                    $column = $key2;
+                } elseif ($count < 3) {
+                    $column = $key1;
+                } else {
+                    $column = null;
+                }
+
+                $result = array_column($resultSet, $column, $key);
+            } else {
+                $result = [];
+            }
+        }
+
+        if (isset($cache) && isset($guid)) {
+            // 缓存数据
+            $this->cacheData($guid, $result, $cache);
+        }
+
+        return $result;
+    }
+
     /**
      * SQL性能分析
      * @access protected
-     * @param string $sql
+     * @param  string $sql
      * @return array
      */
     protected function getExplain($sql)