40 lines
1.3 KiB
PL/PgSQL
40 lines
1.3 KiB
PL/PgSQL
-- 图片主表基础版
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CREATE TABLE images (
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-- 核心标识字段
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image_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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-- 存储元数据
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storage_key TEXT NOT NULL CHECK (storage_key ~ '^[a-z0-9/-]+$'), -- 文件显示名称
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file_name TEXT NOT NULL, -- 文件存储名称，可以包含路径
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mime_type VARCHAR(32) NOT NULL CHECK (mime_type LIKE 'image/%'),
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file_size BIGINT NOT NULL CHECK (file_size > 0),
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width INT CHECK (width > 0),
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height INT CHECK (height > 0),
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-- 业务元数据
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category_id UUID, -- 分类服务提供的UUID
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tags TEXT[] DEFAULT '{}'::TEXT[],
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-- 系统管控字段
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created_at TIMESTAMPTZ DEFAULT NOW() NOT NULL,
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updated_at TIMESTAMPTZ DEFAULT NOW() NOT NULL,
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is_deleted BOOLEAN DEFAULT FALSE NOT NULL
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);
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-- 索引配置
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CREATE INDEX idx_images_category ON images (category_id);
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CREATE INDEX idx_images_created ON images (created_at);
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CREATE INDEX idx_images_tags ON images USING GIN(tags);
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-- 自动更新时间触发器
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CREATE OR REPLACE FUNCTION update_image_modified()
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RETURNS TRIGGER AS $$
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BEGIN
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NEW.updated_at = NOW();
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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CREATE TRIGGER trg_update_image
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BEFORE UPDATE ON images
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FOR EACH ROW EXECUTE FUNCTION update_image_modified(); |