2nd/10_Wiki/Dev/Topic_PHP/PHP_AJAX_Database.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-ajax-database	PHP AJAX Database	Programming_Language	draft	conceptual		AJAX MySQL PHP AJAX 데이터베이스		B	0.87	2026-07-04	2026-07-04			php programming w3schools ajax mysql	https://www.w3schools.com/php/php_ajax_database.asp

PHP AJAX Database

🎯 한 줄 통찰 (One-line insight)

This chapter is the exact same AJAX architecture as the name-autocomplete example, but with the PHP endpoint querying a REAL MySQL database instead of a hardcoded array — the JS-side showUser() function and event-handling boilerplate barely change, proving the AJAX pattern is agnostic to where the PHP script actually gets its data. [S1]

🧠 핵심 개념 (Core concepts)

• onchange event (vs. onkeyup in the earlier example) — triggers on dropdown selection instead of every keystroke. [S1]
• Same AJAX skeleton — XMLHttpRequest + onreadystatechange + query-string parameter passing, identical to the previous chapter. [S1]
• PHP-side database query — intval($_GET['q']) sanitizes the ID as an integer, then a SELECT * FROM user WHERE id = '$q' query runs against MySQLi. [S1]
• Response is a rendered HTML table — the PHP script builds <table> markup directly from the query results and echoes it, which JavaScript injects wholesale into the placeholder div. [S1]

📖 세부 내용 (Details)

• Dropdown trigger: <select name="users" onchange="showUser(this.value)">. [S1]
• PHP query and HTML table generation: $q = intval($_GET['q']); $con = mysqli_connect('localhost','peter','abc123'); mysqli_select_db($con,"ajax_demo"); $sql="SELECT * FROM user WHERE id = '".$q."'"; $result = mysqli_query($con,$sql); echo "<table>..."; while($row = mysqli_fetch_array($result)) { echo "<tr><td>" . $row['FirstName'] . "</td>...</tr>"; } echo "</table>";. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

소스에서 모순되는 정보는 발견되지 않음.

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 드롭다운에서 인물을 선택하면 MySQL에서 정보를 조회해 테이블로 보여주는 것이 AJAX-DB 연동의 대표 실전 사례다. [S1]

💻 코드 패턴 (Code patterns)

PHP endpoint querying MySQL and returning an HTML table for AJAX (PHP):

$q = intval($_GET['q']);
$con = mysqli_connect('localhost', 'peter', 'abc123');
mysqli_select_db($con, "ajax_demo");
$sql = "SELECT * FROM user WHERE id = '" . $q . "'";
$result = mysqli_query($con, $sql);
echo "<table>...";
while ($row = mysqli_fetch_array($result)) {
    echo "<tr><td>" . $row['FirstName'] . "</td></tr>";
}
echo "</table>";

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.87
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: PHP Tutorial
• 관련 개념: PHP AJAX PHP, PHP MySQL Select, PHP AJAX XML
• 참조 맥락: AJAX+MySQL 연동 — XML 데이터 연동(AJAX XML) 챕터로 이어짐.

📚 출처 (Sources)

• [S1] W3Schools — PHP - AJAX and MySQL — https://www.w3schools.com/php/php_ajax_database.asp

📝 변경 이력 (Change history)

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