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10_Wiki/Dev/Topic_Python/Python_MySQL_Insert.md

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+---
+id: python-mysql-insert
+title: "Python MySQL Insert"
+category: "Programming_Language"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["executemany()", "lastrowid", "파이썬 MySQL 삽입"]
+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", "insert", "commit"]
+raw_sources: ["https://www.w3schools.com/python/python_mysql_insert.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[Python MySQL Insert]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+`mydb.commit()` is not optional — without it, INSERT/executemany() changes silently never reach the table, since the connector buffers writes until explicitly committed. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`%s` placeholders** — `sql = "INSERT INTO customers (name, address) VALUES (%s, %s)"` — parameterized, injection-safe insertion. [S1]
+- **`mycursor.execute(sql, val)`** — executes with a tuple of values bound to the placeholders. [S1]
+- **`mydb.commit()`** — REQUIRED to persist changes; without it, no changes are made to the table. [S1]
+- **`mycursor.rowcount`** — number of rows affected by the last statement. [S1]
+- **`executemany(sql, val)`** — inserts multiple rows at once; `val` is a list of tuples. [S1]
+- **`mycursor.lastrowid`** — the auto-generated ID of the last inserted row (only the LAST row's ID if multiple were inserted). [S1]
+
+## 🧩 추출된 패턴 (Extracted patterns)
+- **commit() is the universal write-finalizer** — every mutating operation (INSERT/UPDATE/DELETE) in this whole Python-MySQL series requires the same `mydb.commit()` call, making it the single most important line to remember across all of them. [S1]
+
+## 📖 세부 내용 (Details)
+- Single insert with commit: `sql = "INSERT INTO customers (name, address) VALUES (%s, %s)"; val = ("John", "Highway 21"); mycursor.execute(sql, val); mydb.commit(); print(mycursor.rowcount, "record inserted.")`. [S1]
+- Multiple rows: `val = [('Peter','Lowstreet 4'), ...]; mycursor.executemany(sql, val); mydb.commit()`. [S1]
+- Get last inserted ID: `print("1 record inserted, ID:", mycursor.lastrowid)`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+소스에서 모순되는 정보는 발견되지 않음. commit()이 없으면 아무 변경도 반영되지 않는다는 점이 "Important!"로 강조됨. [S1]
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — SQL Injection/Parameters 챕터에서 배운 파라미터화 쿼리(%s)가 여기서 mysql.connector의 실제 구현으로 이어진다. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Insert with required commit() (Python):
+```python
+sql = "INSERT INTO customers (name, address) VALUES (%s, %s)"
+val = ("John", "Highway 21")
+mycursor.execute(sql, val)
+mydb.commit()  # required, or no changes persist
+print(mycursor.rowcount, "record inserted.")
+```
+
+## ✅ 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:** [[Python MySQL Create Table]], [[SQL Parameters]], [[Python MySQL Update]]
+- **참조 맥락:** commit()이 필요한 모든 쓰기 작업(Insert/Update/Delete)의 공통 패턴 확립.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — Python MySQL Insert Into Table — https://www.w3schools.com/python/python_mysql_insert.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "Python MySQL Insert Into Table" page (Astra wiki-curation, P-Reinforce v3.1 format).