How to fix "ERROR: FK name length exceeds maximum allowed length(30)" in SQL Developer Data Modeller

Question

我正在尝试将数据库的逻辑模型转换为 DDL 脚本，但我不知道如何修复 DDL 脚本或数据建模器中的此错误：-- 错误：FK 名称长度超过最大值允许长度(30) 它似乎是基于我的 junction-table 的主键，它是由两个相邻 tables.

的两个外键组成的

我尝试更改相邻 table 中主键的名称，但是当我尝试使用 Data Modeler 生成新的 DDL 脚本时，它仍然生成旧脚本。

下面是创建 3 个 table 和 link 的代码部分：

    CREATE TABLE items (
        item_no   NUMBER (8) NOT NULL,
        "year"      DATE,
        price     NUMBER (20,2)
    );

    ALTER TABLE items ADD CONSTRAINT items_pk PRIMARY KEY ( item_no );

    CREATE TABLE purchase_order (
        order_no            NUMBER(8) NOT NULL,
        quantity            INTEGER,
        item_description    VARCHAR2(200),
        unit_price          NUMBER(20,2),
        total               NUMBER(20,2),
        order_date          DATE,
        sales_person_code   VARCHAR2(5) NOT NULL,
        supplier_id         NUMBER(3) NOT NULL
    );

    ALTER TABLE purchase_order ADD CONSTRAINT purchase_order_pk PRIMARY KEY ( order_no );

    CREATE TABLE purchase_order_items (
        purchase_order_order_no   NUMBER(8) NOT NULL,
        items_item_no             NUMBER(8) NOT NULL
    );

    ALTER TABLE purchase_order_items ADD CONSTRAINT purchase_order_items_pk PRIMARY KEY ( items_item_no,
                                                                                          purchase_order_order_no );

    ALTER TABLE purchase_order_items
        ADD CONSTRAINT purchase_order_items_items_fk FOREIGN KEY ( items_item_no )
            REFERENCES items ( item_no );

    --  ERROR: FK name length exceeds maximum allowed length(30) 
    ALTER TABLE purchase_order_items
        ADD CONSTRAINT purchase_order_items_purchase_order_fk FOREIGN KEY ( purchase_order_order_no )
            REFERENCES purchase_order ( order_no );

    ALTER TABLE purchase_order
        ADD CONSTRAINT purchase_order_sales_person_fk FOREIGN KEY ( sales_person_code )
            REFERENCES sales_person ( code );

    ALTER TABLE purchase_order
        ADD CONSTRAINT purchase_order_supplier_fk FOREIGN KEY ( supplier_id )
            REFERENCES supplier ( id );

所以我不确定到底是什么 FK 名称长度太长以及我需要在脚本中更改什么来修复此错误。

Answer 1

Oracle 将标识符限制为 30 个字符，因此 purchase_order_items_purchase_order_fk 需要短路。也许像 poi_purchase_porder_fk.

How to fix "ERROR: FK name length exceeds maximum allowed length(30)" in SQL Developer Data Modeller

How to fix "ERROR: FK name length exceeds maximum allowed length(30)" in SQL Developer Data Modeller

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