PHP PDO mySQL 查询如果不存在则创建表

Question

使用 PHP PDO 查询来执行 mySQL 查询。查询由从 foreach() 输入的大量信息组成；所以我回显了 sql 查询。问题出在这里，但我看不到。

这是$sql的输出

CREATE TABLE IF NOT EXISTS `page` (
  `page_ID` INT AUTO_INCREMENT NOT NULL,
  `url` varchar(200) NOT NULL,
  `title` varchar(200),
  `subtitle` TEXT,
  `content` TEXT,
  `parent` varchar(10),
  `privacy` varchar(1),
  `status` varchar(1),
  `creation` varchar(30)
) CHARACTER SET utf8 COLLATE utf8_general_ci;

仅供引用，查询是这样执行的:

function createdbtable($table,$fields){
    global $fsdbh;
    $sql = "CREATE TABLE IF NOT EXISTS `$table` (";
    foreach($fields as $field => $type){ $sql.= "`$field` $type,"; }
    $sql = rtrim($sql,',');
    $sql .= ") CHARACTER SET utf8 COLLATE utf8_general_ci"; return $sql;
    if($fsdbh->exec($sql) !== false) { return 1; }
}

这是错误:

#1075 - Incorrect table definition; there can be only one auto column and it must be defined as a key

Answer 1

您忘记了主键:

CREATE TABLE IF NOT EXISTS `page` (
`page_ID` INT AUTO_INCREMENT NOT NULL,
`url` varchar(200) NOT NULL,
`title` varchar(200),
`subtitle` TEXT,
`content` TEXT,
`parent` varchar(10),
`privacy` varchar(1),
`status` varchar(1),
`creation` varchar(30),
PRIMARY KEY (`page_ID`)) 
CHARACTER SET utf8 COLLATE utf8_general_ci

错误非常明显:

Schema Creation Failed: Incorrect table definition; there can be only one auto column and it must be defined as a key

您必须指定自增键作为键。

编辑:

对于 PHP 代码，我将转到类似的内容:

function createdbtable($table,$fields)
{
    global $fsdbh;

    $sql = "CREATE TABLE IF NOT EXISTS `$table` (";
    $pk  = '';

    foreach($fields as $field => $type)
    {
      $sql.= "`$field` $type,";

      if (preg_match('/AUTO_INCREMENT/i', $type))
      {
        $pk = $field;
      }
    }

    $sql = rtrim($sql,',') . ', PRIMARY KEY (`'.$pk.'`)';

    $sql .= ") CHARACTER SET utf8 COLLATE utf8_general_ci";
    if($fsdbh->exec($sql) !== false) { return 1; }
}