Question

不确定我在这里做错了什么：

mysql> use co_sysdev;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from system_params;
Empty set (0.01 sec)

mysql> INSERT INTO system_params (NUM_ENGINE_D_PROCESSES,MAX_NUM_BATCHES_PER_CLIENT,MAX_NUM_BATCHES_PER_LOCATION) VALUES(5,8,2);
ERROR 1054 (42S22): Unknown column 'NUM_ENGINE_D_PROCESSES' in 'field list'
mysql>

也：

 desc system_params;
+-----------+----------------------------------------------------------------------------------------------------+------+-----+---------+-------+
| Field     | Type                                                                                               | Null | Key | Default | Extra |
+-----------+----------------------------------------------------------------------------------------------------+------+-----+---------+-------+
| attribute | enum('NUM_ENGINE_D_PROCESSES','MAX_NUM_BATCHES_PER_CLIENT','MAX_NUM_BATCHES_PER_LOCATION') | NO   | PRI | NULL    |       |
| value     | varchar(256)                                                                                       | NO   |     | NULL    |       |
+-----------+----------------------------------------------------------------------------------------------------+------+-----+---------+-------+
2 rows in set (0.00 sec)

也：

 show create table system_params;
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table         | Create Table                                                                                                                                                                                                                                                  |
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| system_params | CREATE TABLE `system_params` (
  `attribute` enum('NUM_ENGINE_D_PROCESSES','MAX_NUM_BATCHES_PER_CLIENT','MAX_NUM_BATCHES_PER_LOCATION') NOT NULL,
  `value` varchar(256) NOT NULL,
  PRIMARY KEY (`attribute`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

Answer 1

您不能将枚举值用作字段名称。你的插入必须是

INSERT INTO system_params (attribute, value) VALUES ('NUM_ENGINE_D_PROCESSES', 'foo');

除非您可以在此处插入的可能值无限制（例如，最终用户可定义），否则您将走上一条非常痛苦的道路。

Answer 2

很明显，这个错误表示你使用了错误的列名somwhere，而NUM_ENGINE_D_PROCESSES是枚举值，你将它用作列... SQL插入查询的语法应该像

INSERT INTO your_table_Name (ID, name, ...<column names goes here>...) 
VALUES ('1', 'John', ...<values goes here>...);

在你的情况下

INSERT INTO system_params (attribute, value) VALUES ('NUM_ENGINE_BLA_BLA', 'foo');

（MySQL）SQL错误：ERROR 1054（42S22）：'字段列表'</column>中的未知列'<column name =“”>'

2 个答案: