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74 lines
3.8 KiB
Markdown
74 lines
3.8 KiB
Markdown
---
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id: sql-parameters
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title: "SQL Parameters"
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category: "Database"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["Parameterized Queries", "SQL 파라미터화 쿼리"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.87
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["sql", "database", "w3schools", "security", "parameters"]
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raw_sources: ["https://www.w3schools.com/sql/sql_parameterized_queries.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[SQL Parameters]]
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## 🎯 한 줄 통찰 (One-line insight)
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Parameterized queries fix SQL injection by sending user input as placeholder-bound values instead of concatenated text, so the database always treats the input literally, never as executable SQL. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Parameterized query** — an SQL statement using placeholders instead of directly embedding input values in the query text; placeholders are replaced with actual values at execution time. [S1]
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- **Placeholder syntax varies by vendor** — MySQL uses `?`, SQL Server uses `@`, PostgreSQL uses `$`. [S1]
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- **Literal treatment guarantee** — the SQL engine checks each parameter against its column type and treats it literally, not as part of the executable SQL — this is what neutralizes injection. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Same fix for SELECT and INSERT** — the parameterization pattern applies identically whether reading (`SELECT ... WHERE UserId = @userid`) or writing (`INSERT INTO ... VALUES(@cname, @caddress, @ccity)`). [S1]
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- **Bind-then-execute in application code** — frameworks like ASP.NET separate building the query text (with placeholders) from binding actual values (`cmd.Parameters.AddWithValue(...)`), directly countering the string-concatenation root cause from [[SQL Injection]]. [S1]
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## 📖 세부 내용 (Details)
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- SQL Server-style placeholder query: `query = "SELECT * FROM Users WHERE UserId = @userid"; db.Execute(query, userid);`. [S1]
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- Parameterized INSERT: `query = "INSERT INTO Customers (CustomerName, Address, City) Values(@cname, @caddress, @ccity)"; db.Execute(query, cname, caddress, ccity);`. [S1]
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- ASP.NET binding pattern: `cmd = new SqlCommand(query); cmd.Parameters.AddWithValue("@userid", userid); cmd.ExecuteReader();`. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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소스에서 모순되는 정보는 발견되지 않음.
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — 앞서 SQL Injection 챕터에서 보여준 문자열 연결(concatenation) 취약점을 직접 해소하는 대응책이다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Parameterized SELECT (ASP.NET, SQL Server style):
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```
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userid = getRequestString("UserId");
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query = "SELECT * FROM Customers WHERE CustomerId = @userid";
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cmd = new SqlCommand(query);
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cmd.Parameters.AddWithValue("@userid", userid);
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cmd.ExecuteReader();
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.87
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[SQL Tutorial]]
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- **관련 개념:** [[SQL Injection]], [[SQL Prepared Statements]]
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- **참조 맥락:** SQL Injection의 직접적인 대응책 — Prepared Statements와 함께 사용자 입력을 다루는 표준 방어법.
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## 📚 출처 (Sources)
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- [S1] W3Schools — SQL Parameters — https://www.w3schools.com/sql/sql_parameterized_queries.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "SQL Parameters" page (Astra wiki-curation, P-Reinforce v3.1 format).
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