即使mysql表中有值，SQL查询也不返回值

问题描述：

I got this function:

private function _loadColumnRights() {

            $db = Zend_Registry::get('db');

            // Create the select query
            $select = $db->select()
                        ->from('account_columns', array(
                            'accountId'
                        ))
                        ->where('accountId = ?', $this->getId()); 

            // Fetch the data
            $row = $db->fetchRow($select);
            if($row != null) {
                $this->setColumns($row['columns']);
            }
            else {
                $this->setColumns('');
            }
        }

I search for the accountID = '128'

My table looks like this:

accountId | columns

and at row with accountId = '128' I got a value like this 'orderdate,ref-corlido,item-no,partid,item-description,quantity-value,unit-of-measurement,acquisition-value-order-line,sales-value-order-line,markup,due-date,status,direct-delivery,out-of-scope,non-compliant,memo,request-document,documents'

If I in PHP manually execute this SQL statement:

SELECT * FROM `account_columns` WHERE `accountId` = '128'

Then I get result..

my Code also goes in to this if:

if($row != null) {
            $this->setColumns($row['columns']);
        }

But the value of $row['columns'] is empty.. If I perform a var_dump on my view on this getter then i get empty values

If I change $row['columns']) to :

$this->setColumns($row['accountId']);

then I get the 128 value.. But I don't get the column values.. How come?

我有这个函数： p>

  private function _loadColumnRights（）  {
 
 $ db = Zend_Registry :: get（'db'）; 
 
 //创建选择查询
 $ select = $ db-＆gt; select（）
  - ＆gt; from（'account_columns  '，array（
'accountId'
））
  - ＆gt; where（'accountId =？'，$ this-＆gt; getId（））;  
 
 //获取数据
 $ row = $ db-＆gt; fetchRow（$ select）; 
 if（$ row！= null）{
 $ this-＆gt; setColumns（$ row ['columns  ']）; 
} 
其他{
 $ this-＆gt; setColumns（''）; 
} 
} 
  code>  pre> 
 
 我搜索  accountID ='128' code>  p> 
 
 
我的表格如下所示： p> 
 
 

 accountId | 列 p> 
 
 
和 accountId ='128' code>的行我得到了一个像'orderdate，ref-corlido，item-no，partid，item-description的值 ，数量值，单元的测量，采集值阶线，销售值阶线，标记，到期日，状态，直接递送，外的范围，不符合规定的，备忘录 ，请求文档，文档' p> 
 
 
如果我在PHP中手动执行此SQL语句： p> 
 
 

  SELECT * FROM`count_columns` WHERE`  accountId` ='128'
  code>  pre> 
 
 然后我得到结果..  p> 
 
 
如果符合以下情况，我的代码也会进入： 
 
 
  if（$ row！= null）{
 $ this-＆gt; setColumns（$ row ['columns']）; 
} 
  code>  
 
 但 $ row ['columns' code>]的值为空..如果我在此getter上的视图上执行var_dump，那么我得到空值  p> 
 
 
如果我将 $ row ['columns']  code>更改为： p> 
 
 
  $ this-＆gt; setColumns（  $ row ['accountId']）; 
  code>  pre> 
 
 然后我得到128值.. 
但是我没有得到列值 ..怎么来的？ p> 
  div>

答

Because you only ask for one column in the result row. :)

You only as k for accountId...

    private function _loadColumnRights() {

        $db = Zend_Registry::get('db');

        // Create the select query
        $select = $db->select()

                    // THERE IS YOU ERROR :)
                    // THE SECOND PARAMETER IS AN ARRAY OF RESULT COLUMNS
                    ->from('account_columns', array(
                        //'accountId',  <-- Your error :)
                        '*' // use this if you want all columns back
                        //'columns' // or add this column name
                    ))


                    ->where('accountId = ?', $this->getId()); 

        // Fetch the data
        $row = $db->fetchRow($select);
        if($row != null) {
            $this->setColumns($row['columns']);
        }
        else {
            $this->setColumns('');
        }
    }

P.S.: You really should use another name for the "columns" colmn... :) Look at the list of reserved words and keywords... don't use them for column or table names. :)

https://dev.mysql.com/doc/refman/5.7/en/keywords.html

Have a great day!

Good luck!

即使mysql表中有值，SQL查询也不返回值

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