\n– close() \u3059\u308b\u306e\u306f PreparedStatement#close() \u3067\u306a\u304f ResultSet#close() \u3067\u3082\u306a\u304f\u3001\u7d76\u5bfe\u306b Connection \u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002
\n– \u30ed\u30b0\u60c5\u5831\u306b\u306f PreparedStatement#toString() \u304c\u3088\u3055\u3052(\u5c11\u306a\u304f\u3068\u3082 com.mysql.jdbc \u3067\u306f)\u3002
\n\u7406\u7531\u306f\u3001\u30ed\u30b0\u306e\u305f\u3081\u306e\u5229\u4fbf\u6027\u304b\u3089\u3002SQLException \u304c\u3069\u306e\u30af\u30a8\u30ea\u3067\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u304b\u3092\u6b8b\u3057\u3066\u304f\u308c\u306a\u3044\u306e\u3067\u3001 PreparedStatement \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u30af\u30a8\u30ea\u5468\u308a\u306e\u60c5\u5831\u3092\u304d\u3063\u3061\u308a\u4fdd\u6301\u3057\u3066\u304f\u308c\u3066\u3044\u308c\u3070\u3001toString() \u3067\u30ed\u30b0\u306b\u3069\u306e\u30af\u30a8\u30ea\u6587\u3092\u5b9f\u884c\u3057\u305f\u304b\u304c\u6b8b\u305b\u308b\u3002\u3057\u304b\u3057\u3001PreparedStatement#close() \u306f DB \u63a5\u7d9a\u3092\u9589\u3058\u308b\u4ed5\u69d8\u3068\u306f\u9650\u3089\u306a\u3044\u305f\u3081\u3001Connection#close() \u3092\u547c\u3076\u5fc5\u8981\u304c\u3042\u308b\u3002PreparedStatement#close() \u3060\u3051\u306b\u3057\u305f\u3089\u30d7\u30fc\u30eb\u304c\u3042\u3075\u308c\u3001\u601d\u308f\u306c\u5834\u6240\u3067 DB \u63a5\u7d9a\u304c\u958b\u304f\u306e\u3092\u305a\u3063\u3068\u5f85\u3061\u7d9a\u3051\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u3002
\n– \u4f8b:<\/p>\n
boolean isExist(int id){
\n PreparedStatement ps = null;
\n try{
\n final Connection con = getConnection();
\n try{
\n ps = con.prepareStatement(“SELECT id FROM list WHERE id = ? LIMIT 1”);
\n ps.setInt(1, id);
\n return ps.executeQuery().next();
\n }finally{
\n con.close();
\n }
\n }catch(SQLException e){
\n log(“Query error [“+ps+”]”, e); \/\/ void log(String, Throwable); \u3068\u3059\u308b
\n return false;
\n }
\n}\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"– close() \u3059\u308b\u306e\u306f PreparedStatement#close() \u3067\u306a\u304f ResultSet#close() \u3067\u3082\u306a\u304f\u3001\u7d76\u5bfe\u306b Connection \u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002 – \u30ed\u30b0 … \u7d9a\u304d\u3092\u8aad\u3080 JDBC \u306e\u30ed\u30b0\u3068\u308a\u30e1\u30e2<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[141],"tags":[42],"class_list":["post-356","post","type-post","status-publish","format-standard","hentry","category-lifehack","tag-java"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/356","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/comments?post=356"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/356\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/media?parent=356"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/categories?post=356"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/tags?post=356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}