25 lines
1020 B
SQL
25 lines
1020 B
SQL
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-- Migration: Add outline_mode to projects table
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-- Description: 为项目表添加大纲模式字段,支持一对一和一对多两种模式
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-- Date: 2025-11-27
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-- 1. 添加 outline_mode 字段
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ALTER TABLE projects
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ADD COLUMN outline_mode VARCHAR(20) NOT NULL DEFAULT 'one-to-many';
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-- 2. 添加检查约束,确保只能是两个有效值之一
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ALTER TABLE projects
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ADD CONSTRAINT check_outline_mode
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CHECK (outline_mode IN ('one-to-one', 'one-to-many'));
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-- 3. 创建索引以提高查询性能
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CREATE INDEX idx_projects_outline_mode ON projects(outline_mode);
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-- 4. 为现有项目设置默认模式为一对多(细化模式)
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-- 这是因为现有项目大多使用展开功能
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UPDATE projects SET outline_mode = 'one-to-many' WHERE outline_mode IS NULL;
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-- 5. 添加注释
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COMMENT ON COLUMN projects.outline_mode IS '大纲章节模式: one-to-one(传统模式,1大纲→1章节) 或 one-to-many(细化模式,1大纲→N章节)';
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-- 验证迁移结果
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-- SELECT id, title, outline_mode FROM projects LIMIT 10;
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