82 lines
2.9 KiB
Python
82 lines
2.9 KiB
Python
import sys
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import os
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sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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from sqlalchemy import create_engine, text
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from backend.core.config import settings
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def update_database_schema():
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"""
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数据库无损升级脚本
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"""
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print(f"🔌 连接数据库: {settings.DB_NAME}...")
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engine = create_engine(settings.DATABASE_URL)
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commands = [
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# 1. 安全添加 meta_info 列 (旧数据会自动填充为 {})
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"""
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DO $$
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BEGIN
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IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name='knowledge_chunks' AND column_name='meta_info') THEN
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ALTER TABLE knowledge_chunks ADD COLUMN meta_info JSONB DEFAULT '{}';
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RAISE NOTICE '已添加 meta_info 列';
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END IF;
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END $$;
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""",
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# 2. 安全添加 content_tsvector 列
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"""
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DO $$
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BEGIN
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IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name='knowledge_chunks' AND column_name='content_tsvector') THEN
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ALTER TABLE knowledge_chunks ADD COLUMN content_tsvector TSVECTOR;
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RAISE NOTICE '已添加 content_tsvector 列';
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END IF;
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END $$;
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""",
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# 3. 创建索引 (不影响现有数据)
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"CREATE INDEX IF NOT EXISTS idx_chunks_meta ON knowledge_chunks USING GIN (meta_info);",
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"CREATE INDEX IF NOT EXISTS idx_chunks_tsvector ON knowledge_chunks USING GIN (content_tsvector);",
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# 4. 创建触发器函数 (用于新插入的数据)
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"""
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CREATE OR REPLACE FUNCTION chunks_tsvector_trigger() RETURNS trigger AS $$
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BEGIN
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new.content_tsvector := to_tsvector('english', coalesce(new.title, '') || ' ' || new.content);
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return new;
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END
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$$ LANGUAGE plpgsql;
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""",
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# 5. 绑定触发器
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"""
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DO $$
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BEGIN
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IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname = 'tsvectorupdate') THEN
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CREATE TRIGGER tsvectorupdate BEFORE INSERT OR UPDATE
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ON knowledge_chunks FOR EACH ROW EXECUTE PROCEDURE chunks_tsvector_trigger();
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END IF;
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END $$;
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""",
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# 6. 【新增】回填旧数据
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# 让以前存的 task_id=6 的数据也能生成关键词索引
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"""
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UPDATE knowledge_chunks
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SET content_tsvector = to_tsvector('english', coalesce(title, '') || ' ' || content)
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WHERE content_tsvector IS NULL;
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"""
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]
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with engine.begin() as conn:
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for cmd in commands:
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try:
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conn.execute(text(cmd))
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except Exception as e:
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print(f"⚠️ 执行警告 (通常可忽略): {e}")
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print("✅ 数据库结构升级完成！旧数据已保留并兼容。")
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if __name__ == "__main__":
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update_database_schema() |