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在实施物料清单概念时，我面临一个独特的问题。
使用的罐子：eclipselink 2.4.0、javax.persistence

实体如下：

            @Id
            @TableGenerator(name = "Config_Key_Incrementor", table = "id_generator", pkColumnName = "gen_name", valueColumnName = "gen_value", pkColumnValue = "conifg_id_gen", allocationSize = 1, initialValue = 1)
            @GeneratedValue(strategy = TABLE, generator = "Config_Key_Incrementor")
            @Column(name = "config_id")
            private int configId;

            @Column(name = "config_name")
            private String configName;

            //bi-directional many-to-one association to Bill_Of_Material
            @ManyToOne
            @PrimaryKeyJoinColumn(name="config_id")
            private Configuration parent;

            //bi-directional many-to-one association to Bill_Of_Material
            @OneToMany(mappedBy="parent")
            private List<Configuration> children = new ArrayList<Configuration>();

            public Configuration getParent() {
                return parent;
            }

            public void setParent(Configuration parent) {
                this.parent = parent;
            }

            public List<Configuration> getChildren() {
                return children;
            }

            public void setChildren(List<Configuration> children) {
                this.children = children;
            }

            public int getConfigId() {
                return configId;
            }

            public void setConfigId(int configId) {
                this.configId = configId;
            }

            public String getConfigName() {
                return configName;
            }

            public void setConfigName(String configName) {
                this.configName = configName;
            }

当 IDE 环境是 eclipse juno 时，上面的代码可以正常工作。

输出（IDE是eclipse juno）-

CREATE TABLE configuration
(
config_id integer NOT NULL,
config_name character varying(255),
parent_config_id integer,
CONSTRAINT configuration_pkey PRIMARY KEY (config_id ),
CONSTRAINT fk_configuration_parent_config_id FOREIGN KEY (parent_config_id)
    REFERENCES configuration (config_id) MATCH SIMPLE
    ON UPDATE NO ACTION ON DELETE NO ACTION
)

但是当 IDE 是 eclipse helios 时，相同的代码没有给出错误。

这里的输出（IDE是eclipse helios）是： 

CREATE TABLE configuration    
(    
config_id integer NOT NULL,  
config_name character varying(255),    
CONSTRAINT configuration_pkey PRIMARY KEY (config_id ),  
CONSTRAINT fk_configuration_config_id FOREIGN KEY (config_id)  
       REFERENCES configuration (config_id) MATCH SIMPLE  
       ON UPDATE NO ACTION ON DELETE NO ACTION  
)

上面的代码只需稍作修改即可工作（如帖子中的建议 - JPA 实体在实施物料清单概念时出现错误）

@ManyToOne
@JoinColumn(name="parent_config_id", referencedColumnName="config_id")
private Configuration parent;

问题：我无法弄清楚为什么仅在 IDE 版本更改时会显示此行为

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0 回答 0