{"id":95935,"date":"2026-08-27T03:32:21","date_gmt":"2026-08-26T19:32:21","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/95935.html"},"modified":"2026-08-27T03:32:21","modified_gmt":"2026-08-26T19:32:21","slug":"llm-%e7%94%9f%e6%88%90%e6%95%b0%e6%8d%ae%e5%ba%93%e8%bf%81%e7%a7%bb%e8%84%9a%e6%9c%ac%ef%bc%9a%e4%bb%8e-schema-%e5%8f%98%e6%9b%b4%e5%88%b0%e5%8f%af%e5%9b%9e%e6%bb%9a%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/95935.html","title":{"rendered":"LLM \u751f\u6210\u6570\u636e\u5e93\u8fc1\u79fb\u811a\u672c\uff1a\u4ece schema \u53d8\u66f4\u5230\u53ef\u56de\u6eda\u5b9e\u8df5"},"content":{"rendered":"

LLM \u751f\u6210\u6570\u636e\u5e93\u8fc1\u79fb\u811a\u672c：\u4ece schema \u53d8\u66f4\u5230\u53ef\u56de\u6eda\u5b9e\u8df5<\/h2>\n

\u4e00\u3001\u8fc1\u79fb\u811a\u672c\u7684\u9690\u5f62\u98ce\u9669<\/h3>\n

\u52a0\u4e2a\u5b57\u6bb5\u3001\u6539\u4e2a\u7c7b\u578b，\u770b\u8d77\u6765\u5c0f\u4e8b\u4e00\u6869\u3002\u624b\u5199\u8fc1\u79fb SQL，\u7a0d\u6f0f\u4e00\u53e5，\u7ebf\u4e0a\u6570\u636e\u5c31\u4e71\u3002\u66f4\u6015\u7684\u662f"\u80fd\u524d\u8fdb\u4e0d\u80fd\u540e\u9000"，\u51fa\u95ee\u9898\u65e0\u6cd5\u56de\u6eda\u3002<\/p>\n

\u8fc1\u79fb\u811a\u672c\u548c\u4e00\u822c\u4ee3\u7801\u4e0d\u540c：\u5b83\u76f4\u63a5\u52a8\u751f\u4ea7\u6570\u636e\u3002\u9519\u4e00\u6b65，\u4ee3\u4ef7\u662f\u4e22\u6570\u636e\u3001\u9501\u8868\u3001\u670d\u52a1\u4e2d\u65ad\u3002\u8fd9\u7c7b\u811a\u672c，\u5bb9\u9519\u7387\u6781\u4f4e\u3002<\/p>\n

\u5927\u6a21\u578b\u64c5\u957f\u6309 schema \u5dee\u5f02\u751f\u6210\u8fc1\u79fb\u3002\u4f46\u5b83\u5fc5\u987b\u61c2"\u6570\u636e\u5b89\u5168"\u7684\u7ea6\u675f：\u5148\u5907\u4efd\u601d\u8def\u3001\u52a0\u9501\u7b56\u7565\u3001\u56de\u6eda\u8bed\u53e5\u3002\u672c\u6587\u63a2\u8ba8\u7528 LLM \u751f\u6210\u53ef\u56de\u6eda\u7684\u8fc1\u79fb\u811a\u672c\u3002<\/p>\n

\u4e8c\u3001\u8fc1\u79fb\u751f\u6210\u7684\u673a\u5236<\/h3>\n

\u8fc1\u79fb\u751f\u6210\u5206\u4e09\u6b65：diff\u3001\u751f\u6210\u3001\u6821\u9a8c\u3002diff \u6bb5\u6bd4\u5bf9\u65b0\u65e7 schema，\u5217\u51fa\u53d8\u66f4\u70b9\u3002\u751f\u6210\u6bb5\u4e3a\u6bcf\u70b9\u4ea7\u51fa"\u6b63\u5411 + \u53cd\u5411"\u4e24\u6761\u8bed\u53e5\u3002\u6821\u9a8c\u6bb5\u68c0\u67e5\u662f\u5426\u6709\u7834\u574f\u6027\u7684\u9690\u5f0f\u64cd\u4f5c（\u5982\u4e22\u5217\u65e0\u5907\u4efd）\u3002<\/p>\n

\u5173\u952e\u662f"\u6210\u5bf9\u4ea7\u51fa"\u3002\u6bcf\u6761 forward \u90fd\u914d\u4e00\u6761 backward\u3002\u8fd9\u6837\u4efb\u4f55\u8fc1\u79fb\u90fd\u53ef\u64a4\u9500，\u800c\u975e\u5355\u884c\u9053\u3002<\/p>\n

\u4e0b\u9762\u662f\u751f\u6210\u7684\u94fe\u8def：<\/p>\n

flowchart TD
\n A[\u65e7 schema] –> B[diff \u53d8\u66f4\u70b9]
\n C[\u65b0 schema] –> B
\n B –> D[\u751f\u6210 forward SQL]
\n B –> E[\u751f\u6210 backward SQL]
\n D –> F[\u6821\u9a8c: \u542b\u9501\/\u5907\u4efd\u7b56\u7565]
\n E –> F
\n F –> G{\u5b89\u5168?}
\n G –>|\u662f| H[\u4ea7\u51fa\u53ef\u56de\u6eda\u8fc1\u79fb]
\n G –>|\u5426| I[\u63d0\u793a\u4eba\u5de5\u8865\u5168]
\n style H fill:#e8f5e9
\n style I fill:#ffebee<\/p>\n

\u5173\u952e\u5728"\u7834\u574f\u6027\u64cd\u4f5c\u62e6\u622a"\u3002\u5220\u5217\u3001\u6539\u7c7b\u578b\u8fd9\u7c7b\u4e0d\u53ef\u9006\u64cd\u4f5c，\u5fc5\u987b\u663e\u5f0f\u786e\u8ba4\u3002\u7edd\u4e0d\u80fd\u6a21\u578b\u9ed8\u8ba4\u53ef\u6267\u884c\u3002<\/p>\n

\u4e09\u3001\u751f\u4ea7\u7ea7\u5b9e\u73b0<\/h3>\n

\u4e0b\u9762\u7528\u4ee3\u7801\u63cf\u8ff0\u8fc1\u79fb\u7684\u751f\u6210\u4e0e\u6821\u9a8c\u9aa8\u67b6\u3002<\/p>\n

from dataclasses import dataclass
\nfrom typing import Optional<\/p>\n

@dataclass
\nclass Migration:
\n name: str
\n forward: str
\n backward: str
\n destructive: bool = False<\/p>\n

DESTRUCTIVE_HINTS = ["DROP", "DELETE", "ALTER … TYPE"]<\/p>\n

def guard(m: Migration) -> Migration:
\n """\u6807\u8bb0\u7834\u574f\u6027\u64cd\u4f5c，\u5f3a\u5236\u4eba\u5de5\u786e\u8ba4\u800c\u975e\u81ea\u52a8\u6267\u884c"""
\n upper = m.forward.upper()
\n m.destructive = any(h.split()[0] in upper for h in DESTRUCTIVE_HINTS)
\n return m<\/p>\n

def emit(m: Migration) -> str:
\n if m.destructive:
\n # \u7834\u574f\u6027\u8fc1\u79fb\u5fc5\u987b\u5e26\u5907\u4efd\u4e0e\u56de\u6eda，\u4e14\u4e0d\u81ea\u52a8\u8dd1
\n return f"– \u9700\u4eba\u5de5\u786e\u8ba4(\u7834\u574f\u6027)\\\\n– \u524d\u7f6e: \u5168\u91cf\u5907\u4efd\\\\n{m.forward}\\\\n\\\\n– \u56de\u6eda:\\\\n{m.backward}\\\\n"
\n return f"{m.forward}\\\\n\\\\n– \u56de\u6eda:\\\\n{m.backward}\\\\n"<\/p>\n

if __name__ == "__main__":
\n m = Migration("add_email", "ALTER TABLE users ADD email TEXT;", "ALTER TABLE users DROP email;")
\n print(emit(guard(m)))<\/p>\n

\u771f\u5b9e\u6d41\u7a0b\u4f1a\u5148 dry-run \u5728\u5f71\u5b50\u5e93\u3002\u5e76\u7528\u4e8b\u52a1\u5305\u88f9，\u5931\u8d25\u6574\u4f53\u56de\u6eda\u3002\u5927\u8868\u53d8\u66f4\u6539\u7528\u5728\u7ebf DDL，\u907f\u514d\u957f\u9501\u3002<\/p>\n

\u56db\u3001LLM \u751f\u6210\u6570\u636e\u5e93\u8fc1\u79fb\u811a\u672c\u7684\u4ee3\u4ef7\u4e0e\u8fb9\u754c<\/h3>\n

LLM \u751f\u6210\u8fc1\u79fb\u9ad8\u6548，\u4f46\u5b89\u5168\u7ea2\u7ebf\u4e0d\u80fd\u78b0\u3002<\/p>\n

\u4e0d\u53ef\u9006\u64cd\u4f5c\u7684\u7edd\u5bf9\u8c28\u614e\u3002DROP\/\u7c7b\u578b\u53d8\u66f4\u4e00\u65e6\u6267\u884c\u96be\u633d\u56de\u3002\u5fc5\u987b\u4eba\u5de5\u786e\u8ba4 + \u524d\u7f6e\u5907\u4efd + \u56de\u6eda\u8bed\u53e5\u4e09\u4ef6\u5957\u3002\u6a21\u578b\u53ef\u751f\u6210，\u4e0d\u53ef\u81ea\u52a8\u6279\u51c6\u3002<\/p>\n

\u5927\u8868\u9501\u8868\u98ce\u9669\u3002ALTER \u5927\u8868\u4f1a\u957f\u65f6\u95f4\u9501，\u963b\u585e\u4e1a\u52a1\u3002\u5e94\u8bc6\u522b\u8868\u89c4\u6a21，\u6539\u7528 pt-online-schema-change \u7c7b\u5de5\u5177\u3002\u751f\u6210\u811a\u672c\u8981\u533a\u5206"\u5c0f\u8868\u76f4\u63a5\u6539"\u4e0e"\u5927\u8868\u5728\u7ebf\u6539"\u3002<\/p>\n

\u6570\u636e\u56de\u586b\u7684\u6b63\u786e\u6027\u3002\u52a0\u975e\u7a7a\u5217\u8981\u8865\u9ed8\u8ba4\u503c\u6216\u56de\u586b\u3002\u6a21\u578b\u6613\u6f0f"\u5386\u53f2\u6570\u636e\u600e\u4e48\u586b"\u8fd9\u4e00\u6b65\u3002\u751f\u6210\u65f6\u8981\u663e\u5f0f\u95ee\u6e05\u56de\u586b\u7b56\u7565\u3002<\/p>\n

\u73af\u5883\u5dee\u5f02\u3002\u5f00\u53d1\u5e93\u7ed3\u6784\u4e0e\u751f\u4ea7\u53ef\u80fd\u4e0d\u4e00\u81f4\u3002\u751f\u6210\u5e94\u57fa\u4e8e\u751f\u4ea7 schema \u7684\u5feb\u7167，\u800c\u975e\u672c\u5730\u3002\u5426\u5219\u8fc1\u79fb\u5728\u751f\u4ea7\u8dd1\u51fa\u672a\u9884\u671f\u9519\u8bef\u3002<\/p>\n

\u8fc1\u79fb\u751f\u6210\u7684"\u73af\u5883\u4e00\u81f4\u6027"\u662f\u9690\u5f62\u96f7\u533a\u3002\u5f00\u53d1\u5e93\u7ed3\u6784\u4e0e\u751f\u4ea7\u5f80\u5f80\u4e0d\u540c\u6b65，\u57fa\u4e8e\u672c\u5730 schema \u751f\u6210\u7684\u8fc1\u79fb，\u5728\u751f\u4ea7\u8dd1\u53ef\u80fd\u5f15\u7528\u4e86\u4e0d\u5b58\u5728\u7684\u8868\u6216\u5b57\u6bb5\u3002\u5efa\u8bae\u751f\u6210\u524d\u5148\u62c9\u53d6\u751f\u4ea7 schema \u5feb\u7167\u4f5c\u4e3a\u4e8b\u5b9e\u6765\u6e90，\u800c\u975e\u4fe1\u4efb\u672c\u5730\u3002\u53e6\u4e00\u4e2a\u5b9e\u8df5\u662f"\u9884\u6f14\u673a\u5236"：\u8fc1\u79fb\u5148\u5728\u5f71\u5b50\u5e93\u6216\u526f\u672c\u5e93\u5b8c\u6574\u8dd1\u4e00\u904d forward+backward，\u786e\u8ba4\u53ef\u9006\u4e14\u65e0\u8bef，\u518d\u4e0a\u751f\u4ea7\u3002\u6700\u540e，\u5927\u8868\u8fc1\u79fb\u8981\u907f\u5f00\u4e1a\u52a1\u9ad8\u5cf0，\u7528\u5728\u7ebf DDL \u5de5\u5177\u5728\u6d41\u91cf\u4f4e\u5cf0\u6267\u884c，\u5e76\u628a"\u9501\u65f6\u957f"\u4f5c\u4e3a\u5ba1\u6279\u786c\u6307\u6807，\u8d85\u8fc7\u9608\u503c\u5fc5\u987b\u6539\u65b9\u6848，\u4e0d\u80fd\u62ff\u4e1a\u52a1\u53ef\u7528\u6027\u8d4c\u3002<\/p>\n

\u4e94\u3001\u603b\u7ed3<\/h3>\n

\u7528 LLM \u751f\u6210\u8fc1\u79fb\u811a\u672c，\u672c\u8d28\u662f\u7528"\u6210\u5bf9\u56de\u6eda"\u6362\u6570\u636e\u5b89\u5168\u3002\u673a\u5236\u4e0a diff \u4ea7\u51fa forward\/backward，\u7834\u574f\u6027\u64cd\u4f5c\u5f3a\u5236\u4eba\u5de5\u3002\u5de5\u7a0b\u4e0a dry-run \u5f71\u5b50\u5e93\u3001\u5728\u7ebf DDL \u63a7\u9501\u3001\u57fa\u4e8e\u751f\u4ea7 schema\u3002<\/p>\n

\u843d\u5730\u8def\u7ebf：\u5148 diff \u51fa\u53d8\u66f4\u70b9；\u6210\u5bf9\u751f\u6210\u6b63\u53cd\u8bed\u53e5；\u6807\u8bb0\u7834\u574f\u6027\u5e76\u524d\u7f6e\u5907\u4efd；\u5927\u8868\u8d70\u5728\u7ebf\u53d8\u66f4\u3002\u8fc1\u79fb\u80fd\u524d\u8fdb\u4e5f\u80fd\u540e\u9000，\u7ebf\u4e0a\u624d\u6562\u52a8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

LLM \u751f\u6210\u6570\u636e\u5e93\u8fc1\u79fb\u811a\u672c：\u4ece schema \u53d8\u66f4\u5230\u53ef\u56de\u6eda\u5b9e\u8df5
\n\u4e00\u3001\u8fc1\u79fb\u811a\u672c\u7684\u9690\u5f62\u98ce\u9669
\n\u52a0\u4e2a\u5b57\u6bb5\u3001\u6539\u4e2a\u7c7b\u578b，\u770b\u8d77\u6765\u5c0f\u4e8b\u4e00\u6869\u3002\u624b\u5199\u8fc1\u79fb SQL，\u7a0d\u6f0f\u4e00\u53e5，\u7ebf\u4e0a\u6570\u636e\u5c31\u4e71\u3002\u66f4\u6015\u7684\u662f\\”\u80fd\u524d\u8fdb\u4e0d\u80fd\u540e\u9000\\”，\u51fa\u95ee\u9898\u65e0\u6cd5\u56de\u6eda\u3002
\n\u8fc1\u79fb\u811a\u672c\u548c\u4e00\u822c\u4ee3\u7801\u4e0d\u540c：\u5b83\u76f4\u63a5\u52a8\u751f\u4ea7\u6570\u636e\u3002\u9519\u4e00\u6b65，\u4ee3\u4ef7\u662f\u4e22\u6570\u636e\u3001\u9501\u8868\u3001\u670d\u52a1\u4e2d\u65ad\u3002\u8fd9\u7c7b\u811a\u672c，\u5bb9\u9519\u7387\u6781\u4f4e\u3002
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