{"id":127441,"date":"2024-03-25T02:31:16","date_gmt":"2024-03-24T17:31:16","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%82%88%e3%82%8b%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%82%af%e3%82%a8%e3%83%aa%e3%81%ae%e5%ae%9f%e8%a3%85%e6%96%b9%e6%b3%95\/"},"modified":"2024-03-26T16:51:43","modified_gmt":"2024-03-26T07:51:43","slug":"java%e3%81%ab%e3%82%88%e3%82%8b%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%82%af%e3%82%a8%e3%83%aa%e3%81%ae%e5%ae%9f%e8%a3%85%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%82%88%e3%82%8b%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%82%af%e3%82%a8%e3%83%aa%e3%81%ae%e5%ae%9f%e8%a3%85%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u306b\u3088\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u5b9f\u88c5\u65b9\u6cd5"},"content":{"rendered":"

Java\u3067\u306fJDBC\uff08Java Database Connectivity\uff09\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u30021. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c9\u30e9\u30a4\u30d0\u306e\u30ed\u30fc\u30c9\uff1a\u300cClass.forName()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c9\u30e9\u30a4\u30d0\u3092\u30ed\u30fc\u30c9\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001MySQL\u30c9\u30e9\u30a4\u30d0\u3092\u30ed\u30fc\u30c9\u3059\u308b\u306b\u306f\u300cClass.forName(“com.mysql.jdbc.Driver”)\u300d\u3092\u4f7f\u7528\u3057\u307e\u3059\u30022. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u306e\u78ba\u7acb\uff1a\u300cDriverManager.getConnection()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u306e\u63a5\u7d9a\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306eURL\u3001\u30e6\u30fc\u30b6\u540d\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u306a\u3069\u306e\u60c5\u5831\u304c\u5fc5\u8981\u3067\u3059\u30023. SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u4f5c\u6210\uff1aSQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u30af\u30a8\u30ea\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u300cusers\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3059\u3079\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u30af\u30a8\u30ea\u3059\u308b\u306b\u306f\u3001\u300cSELECT * FROM users\u300d\u3092\u4f7f\u7528\u3057\u307e\u3059\u30024. Statement\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210\uff1a\u300cConnection.createStatement()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066Statement\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306fSQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u30025. SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u5b9f\u884c\uff1aStatement\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u300cexecuteQuery()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u5b9f\u884c\u3057\u3001\u30af\u30a8\u30ea\u7d50\u679c\u3092ResultSet\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u8fd4\u3057\u307e\u3059\u30026. \u30af\u30a8\u30ea\u7d50\u679c\u306e\u51e6\u7406\uff1aResultSet\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30af\u30a8\u30ea\u7d50\u679c\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u300cnext()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u7d50\u679c\u30bb\u30c3\u30c8\u3092\u53cd\u5fa9\u51e6\u7406\u3057\u3001\u300cgetXxx()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5404\u5217\u306e\u5024\u3092\u53d6\u5f97\u3057\u307e\u3059\u30027. \u63a5\u7d9a\u306e\u7d42\u4e86\uff1a\u300cResultSet.close()\u300d\u3001\u300cStatement.close()\u300d\u3001\u300cConnection.close()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u7d50\u679c\u30bb\u30c3\u30c8\u3001Statement\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u7d42\u4e86\u3057\u3001\u30ea\u30bd\u30fc\u30b9\u3092\u89e3\u653e\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001Java\u3067\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002“`javaimport java.sql.*;public class DatabaseQuery {
\npublic static void main(String[] args) {
\nString url = “jdbc:mysql:\/\/localhost:3306\/mydatabase”;
\nString username = “root”;
\nString password = “123456”;<\/p>\n

try {
\n\/\/ MySQL\u30c9\u30e9\u30a4\u30d0\u306e\u30ed\u30fc\u30c9
\nClass.forName(“com.mysql.jdbc.Driver”);<\/p>\n

\/\/ \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u306e\u78ba\u7acb
\nConnection connection = DriverManager.getConnection(url, username, password);<\/p>\n

\/\/ SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u4f5c\u6210
\nString sql = “SELECT * FROM users”;<\/p>\n

\/\/ Statement\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210
\nStatement statement = connection.createStatement();<\/p>\n

\/\/ SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u5b9f\u884c
\nResultSet resultSet = statement.executeQuery(sql);<\/p>\n

\/\/ \u30af\u30a8\u30ea\u7d50\u679c\u306e\u51e6\u7406
\nwhile (resultSet.next()) {
\nint id = resultSet.getInt(“id”);
\nString name = resultSet.getString(“name”);
\nSystem.out.println(“id: ” + id + “, name: ” + name);
\n}<\/p>\n

\/\/ \u63a5\u7d9a\u306e\u7d42\u4e86
\nresultSet.close();
\nstatement.close();
\nconnection.close();
\n} catch (Exception e) {
\ne.printStackTrace();
\n}
\n}}“`\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306eURL\u3001\u30e6\u30fc\u30b6\u540d\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u3001SQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306f\u3001\u5b9f\u969b\u306e\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u7f6e\u304d\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

Java\u3067\u306fJDBC\uff08Java Database Connectivity\uff09\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u30021. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c9\u30e9\u30a4\u30d0\u306e\u30ed\u30fc\u30c9\uff1a\u300cClass.forName()\u300d\u30e1\u30bd […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-127441","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava\u306b\u3088\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u5b9f\u88c5\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306b\u3088\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u5b9f\u88c5\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u306b\u3088\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u5b9f\u88c5\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306fJDBC\uff08Java Database Connectivity\uff09\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u30021. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c9\u30e9\u30a4\u30d0\u306e\u30ed\u30fc\u30c9\uff1a\u300cClass.forName()\u300d\u30e1\u30bd […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306b\u3088\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u5b9f\u88c5\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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