43 lines
1.8 KiB
SQL
43 lines
1.8 KiB
SQL
-- 章节拆分为 chapter_sections：每段正文 + 配图独立存储，chapters 只保留封面图
|
||
-- 执行顺序: 1) 本文件 2) python -m scripts.migrate_chapters_to_sections
|
||
-- 执行方式: psql -U <user> -d <database> -f api/migrations/add_chapter_sections.sql
|
||
|
||
-- ========== 1. 新建 chapter_sections 表 ==========
|
||
CREATE TABLE IF NOT EXISTS chapter_sections (
|
||
id VARCHAR NOT NULL PRIMARY KEY,
|
||
chapter_id VARCHAR NOT NULL REFERENCES chapters(id) ON DELETE CASCADE,
|
||
order_index INTEGER NOT NULL,
|
||
content TEXT NOT NULL,
|
||
image JSONB,
|
||
updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
|
||
);
|
||
CREATE INDEX IF NOT EXISTS ix_chapter_sections_chapter_id ON chapter_sections(chapter_id);
|
||
CREATE INDEX IF NOT EXISTS ix_chapter_sections_order ON chapter_sections(chapter_id, order_index);
|
||
|
||
-- 若 chapter_sections 已存在且已提前切换到 image_id 结构，重跑迁移时需要临时补回 image 列，
|
||
-- 以便后续 Python 脚本先完成 JSON -> memoir_images 的数据搬迁。
|
||
DO $$
|
||
BEGIN
|
||
IF NOT EXISTS (
|
||
SELECT 1
|
||
FROM information_schema.columns
|
||
WHERE table_schema = 'public'
|
||
AND table_name = 'chapter_sections'
|
||
AND column_name = 'image'
|
||
) THEN
|
||
ALTER TABLE chapter_sections ADD COLUMN image JSONB;
|
||
RAISE NOTICE '已补回 chapter_sections.image，供数据迁移使用';
|
||
END IF;
|
||
END $$;
|
||
|
||
-- ========== 2. chapters 表增加 cover_image ==========
|
||
DO $$
|
||
BEGIN
|
||
IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema = 'public' AND table_name = 'chapters' AND column_name = 'cover_image') THEN
|
||
ALTER TABLE chapters ADD COLUMN cover_image JSONB;
|
||
RAISE NOTICE '已添加 chapters.cover_image';
|
||
END IF;
|
||
END $$;
|
||
|
||
-- ========== 3. 回填与删列由脚本 scripts.migrate_chapters_to_sections 完成 ==========
|