2nd/10_Wiki/Dev/Topic_PHP/PHP_MySQL_Create_DB.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
php-mysql-create-db	PHP MySQL Create DB	Programming_Language	draft	conceptual		CREATE DATABASE PHP MySQL DB 생성		B	0.89	2026-07-04	2026-07-04			php programming w3schools mysql database	https://www.w3schools.com/php/php_mysql_create.asp

PHP MySQL Create DB

🎯 한 줄 통찰 (One-line insight)

Connecting to CREATE a database omits the database-name argument entirely — new mysqli($servername, $username, $password) has only 3 arguments, unlike the 4-argument connection used everywhere else, since the database you're about to create doesn't exist yet to connect to. [S1]

🧠 핵심 개념 (Core concepts)

• CREATE DATABASE dbname — the SQL command to create a database. [S1]
• 3-argument connection for creation — no database name yet, since it doesn't exist. [S1]
• Requires admin privileges — creating/deleting databases needs administrative access. [S1]
• $conn->query($sql) (MySQLi OOP) — executes the CREATE DATABASE statement, returns true on success. [S1]
• $conn->exec($sql) (PDO) — the PDO equivalent for executing a non-SELECT statement. [S1]

📖 세부 내용 (Details)

• MySQLi OOP: $conn = new mysqli($servername, $username, $password); $sql = "CREATE DATABASE myDB"; if ($conn->query($sql) === TRUE) { echo "Database created successfully"; } else { echo "Error creating database: " . $conn->error; }. [S1]
• MySQLi procedural: $conn = mysqli_connect($servername, $username, $password); if (mysqli_query($conn, $sql)) { echo "Database created successfully"; }. [S1]
• PDO: $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); ... $conn->exec($sql); echo "Database created successfully"; — wrapped in try/catch(PDOException). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 특별히 없으나, DB 생성 시 연결 인자가 3개뿐이라는 점이 다른 모든 챕터의 4개 인자 패턴과 유일하게 다름. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — myDB라는 이름의 데이터베이스를 생성하는 것이 이후 테이블 생성 챕터의 전제 조건이다. [S1]

💻 코드 패턴 (Code patterns)

Creating a database with only 3 connection arguments (PHP):

$conn = new mysqli($servername, $username, $password); // no dbname yet
$sql = "CREATE DATABASE myDB";
if ($conn->query($sql) === TRUE) {
    echo "Database created successfully";
}

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.89
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: PHP Tutorial
• 관련 개념: PHP MySQL Connect, PHP MySQL Create Table
• 참조 맥락: 데이터베이스 생성 — 테이블 생성(Create Table) 챕터로 직접 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP Create a MySQL Database — https://www.w3schools.com/php/php_mysql_create.asp

📝 변경 이력 (Change history)

• 2026-07-04: Initial draft synthesized from the W3Schools "PHP Create a MySQL Database" page (Astra wiki-curation, P-Reinforce v3.1 format).