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10_Wiki/Dev/Topic_Python/Python_MySQL_Update.md

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+---
+id: python-mysql-update
+title: "Python MySQL Update"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["파이썬 MySQL 수정"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.9
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["python", "mysql", "w3schools", "update", "commit"]
+raw_sources: ["https://www.w3schools.com/python/python_mysql_update.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python MySQL Update]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+UPDATE follows the identical commit()-required, WHERE-critical, %s-parameterized pattern as INSERT and DELETE — by this point in the series, the risk warnings are a repeated refrain across every mutating SQL operation. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`UPDATE ... SET ... WHERE ...`** — modifies matching records. [S1]
+- **`mydb.commit()`** — required for the update to persist. [S1]
+- **Missing WHERE = update everything** — same risk as raw SQL UPDATE. [S1]
+- **`mycursor.rowcount`** — number of rows affected. [S1]
+- **Parameterized update** — `%s` placeholders for both the SET value and the WHERE condition. [S1]
+
+## 📖 세부 내용 (Details)
+- Basic update: `sql = "UPDATE customers SET address = 'Canyon 123' WHERE address = 'Valley 345'"; mycursor.execute(sql); mydb.commit(); print(mycursor.rowcount, "record(s) affected")`. [S1]
+- Parameterized update: `sql = "UPDATE customers SET address = %s WHERE address = %s"; val = ("Valley 345", "Canyon 123"); mycursor.execute(sql, val); mydb.commit()`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — SQL Update의 WHERE 필수 규칙과 commit() 요구사항이 mysql.connector에서도 동일하게 적용된다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Parameterized update with two placeholders (Python):
+```python
+sql = "UPDATE customers SET address = %s WHERE address = %s"
+val = ("Valley 345", "Canyon 123")
+mycursor.execute(sql, val)
+mydb.commit()
+print(mycursor.rowcount, "record(s) affected")
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
+- **신뢰 점수:** 0.90
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[Python Tutorial]]
+- **관련 개념:** [[SQL Update]], [[Python MySQL Insert]], [[Python MySQL Delete]]
+- **참조 맥락:** SQL Update의 WHERE 필수 규칙과 commit() 요구사항이 mysql.connector에서도 동일하게 적용.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python MySQL Update Table — https://www.w3schools.com/python/python_mysql_update.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python MySQL Update Table" page (Astra wiki-curation, P-Reinforce v3.1 format).