Question

@ManyToMany
@JoinTable(schema = "cust_tables", joinColumns = @JoinColumn(name = "item_id"))
public Map<Attribute, Option> attributeValues;

属性是属性名称，option是该属性的有效值。

EclipseLink当前为表生成以下DDL：

CREATE TABLE `items_options` (
  `attributes_id` bigint(20) NOT NULL,
  `item_id` bigint(20) NOT NULL,
  `attributes_KEY` bigint(20) DEFAULT NULL,
  PRIMARY KEY (`item_id`,`attributes_id`),
  KEY `FK_items_options_attributes_id` (`attributes_id`),
  KEY `FK_items_options_attributes_KEY` (`attributes_KEY`),
  CONSTRAINT `FK_items_options_attributes_id` FOREIGN KEY (`attributes_id`) REFERENCES `options` (`id`),
  CONSTRAINT `FK_items_options_attributes_KEY` FOREIGN KEY (`attributes_KEY`) REFERENCES `attributes` (`id`),
  CONSTRAINT `FK_items_options_item_id` FOREIGN KEY (`item_id`) REFERENCES `items` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

在连接表上，我需要更改列名：'attributes_id'和'attributes_KEY'。我该如何指定？

Answer 1

要更改列属性的名称，请尝试注释@MayKeyJoinColumn。像这样：

@ManyToMany
@JoinTable(schema = "cust_tables", joinColumns = @JoinColumn(name = "item_id"))
@MapKeyJoinColumn(name="ATTRIBUTE")
public Map<Attribute, Option> attributeValues;

JPA2.0映射Map <entity0，entity1>的映射如何指定列名？</entity0，entity1>

1 个答案: