Question

大家好！我是MySQL的新手。我使用Workbench工具创建了一个新模型（我的意思是，我自己没有编写任何代码串）。当我试图改进它时，我得到了：

Executing SQL script in server
ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'COMMENT '')
ENGINE = InnoDB' at line 8
SQL Code:
    -- -----------------------------------------------------
    -- Table `university`.`CITY`
    -- -----------------------------------------------------
    CREATE TABLE IF NOT EXISTS `university`.`CITY` (
      `ID_CITY` INT NOT NULL COMMENT '',
      `CNAME` TEXT(15) NULL COMMENT '',
      `POPULATION` INT NULL COMMENT '',
      PRIMARY KEY (`ID_CITY`)  COMMENT '')
    ENGINE = InnoDB

SQL script execution finished: statements: 5 succeeded, 1 failed

 Fetching back view definitions in final form.
 Nothing to fetch

此外，当试图转发工程师默认的Workbench模型“sakila_full”时，我得到同样的事情：

Executing SQL script in server
ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'COMMENT '',
INDEX `idx_actor_last_name` (`last_name` ASC)  COMMENT '')
ENGINE ' at line 9
SQL Code:
    -- -----------------------------------------------------
    -- Table `sakila`.`actor`
    -- -----------------------------------------------------
    CREATE TABLE IF NOT EXISTS `sakila`.`actor` (
      `actor_id` SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '',
      `first_name` VARCHAR(45) NOT NULL COMMENT '',
      `last_name` VARCHAR(45) NOT NULL COMMENT '',
      `last_update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '',
      PRIMARY KEY (`actor_id`)  COMMENT '',
      INDEX `idx_actor_last_name` (`last_name` ASC)  COMMENT '')
    ENGINE = InnoDB
    DEFAULT CHARACTER SET = utf8

 SQL script execution finished: statements: 5 succeeded, 1 failed

 Fetching back view definitions in final form.
Could not get definition for sakila.customer_list from server
Could not get definition for sakila.film_list from server
Could not get definition for sakila.nicer_but_slower_film_list from server
Could not get definition for sakila.staff_list from server
Could not get definition for sakila.sales_by_store from server
Could not get definition for sakila.sales_by_film_category from server
Could not get definition for sakila.actor_info from server
7 views were read back.

提前致谢！

Answer 1

嗯，BIG的问题在于，当使用＆＃34; Forward Engineer＆＃34;时，Mysql Workbench会添加自己产生错误的索引注释。或＆＃34;同步模型＆＃34;

当我使用6.0版时，此问题不存在。

Answer 2

看起来你已经把COMMENT字符串放得太远了。根据{{3}}，只有列定义允许COMMENT属性。这意味着您在INDEX语句末尾附近列出的PRIMARY KEY或CREATE定义无效。

COMMENT ''不是必需的，可以完全省略，特别是因为你将它们留空。否则，它们将用于列定义上的一些额外的人类可读元数据。

要使用此功能，请从索引和主键定义中删除COMMENT属性。

CREATE TABLE IF NOT EXISTS `university`.`CITY` (
  `ID_CITY` INT NOT NULL COMMENT '',
  `CNAME` TEXT(15) NULL COMMENT '',
  `POPULATION` INT NULL COMMENT '',
  -- No COMMENT on PK
  PRIMARY KEY (`ID_CITY`)
) ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `sakila`.`actor` (
  `actor_id` SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '',
  `first_name` VARCHAR(45) NOT NULL COMMENT '',
  `last_name` VARCHAR(45) NOT NULL COMMENT '',
  `last_update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '',
  -- No COMMENT on PK or INDEX
  PRIMARY KEY (`actor_id`),
  INDEX `idx_actor_last_name` (`last_name` ASC)
) ENGINE = InnoDB
  DEFAULT CHARACTER SET = utf8;

或者没有任何空白COMMENT的整个事情：

CREATE TABLE IF NOT EXISTS `university`.`CITY` (
  `ID_CITY` INT NOT NULL COMMENT 'A comment that is not blank!',
  `CNAME` TEXT(15) NULL,
  `POPULATION` INT NULL,
  PRIMARY KEY (`ID_CITY`)
) ENGINE = InnoDB;

（与另一张表相同）

MySQL通常非常擅长使用错误消息直接指向语法错误的来源：

查看与您的MySQL服务器版本对应的手册，以便在'COMMENT''附近使用正确的语法，

除了在语句末尾发生的错误（有些含糊不清）之外，在附近使用的正确语法将向您显示确切的错误。在上述情况下，COMMENT '')会引导您选择COMMENT后跟)的{{1}}属性PRIMARY KEY。从那里，查看手册（上面链接），了解您声明的每个部分的法律语法。

MySQL Workbench错误1064

2 个答案: