{"id":1135,"date":"2013-09-16T20:22:05","date_gmt":"2013-09-16T11:22:05","guid":{"rendered":"http:\/\/kazu.tv\/blog\/?p=1135"},"modified":"2013-09-16T21:18:57","modified_gmt":"2013-09-16T12:18:57","slug":"squeryl%e3%81%a7order-by-nulls-first-%e5%8f%88%e3%81%aflast%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99%e3%82%8b%e3%81%ab%e3%81%af","status":"publish","type":"post","link":"https:\/\/kazu.tv\/blog\/2013\/09\/16\/squeryl%e3%81%a7order-by-nulls-first-%e5%8f%88%e3%81%aflast%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99%e3%82%8b%e3%81%ab%e3%81%af\/","title":{"rendered":"Squeryl\u3067ORDER BY NULLS FIRST (\u53c8\u306fLAST)\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f"},"content":{"rendered":"<p>\u672c\u8a18\u4e8b\u306f\u3001ML\u3067\u8cea\u554f\u3057\u3066\u8fd4\u3063\u3066\u304d\u305f<a href=\"https:\/\/groups.google.com\/forum\/#!topic\/squeryl\/nBLBpX2eIpk\" target=\"_blank\">\u5185\u5bb9<\/a>\u3092\u307e\u3068\u3081\u305f\u3060\u3051\u3002<\/p>\n<h2>ORDER BY\u3092\u6307\u5b9a\u3057\u305f\u6642\u306eNULL\u306e\u6271\u3044<\/h2>\n<p>SQL\u3067ORDER BY\u3092\u6307\u5b9a\u3057\u305f\u6642\u3001\u305d\u306e\u5217\u306bNULL\u304c\u3042\u3063\u305f\u5834\u5408\u3001\u305d\u306e\u884c\u306f\u3069\u3053\u306b\u6765\u308b\u306e\u304b\uff1f\u30c7\u30d5\u30a9\u30eb\u30c8\u3060\u3068\u300c\u6700\u5c0f\u306e\u5024\u300d\u3068\u3057\u3066\u51e6\u7406\u3055\u308c\u308b\u3093\u3060\u3051\u3069\u3001\u3044\u304f\u3064\u304b\u306eDBMS\u3067\u306fNULLS FIRST\u3042\u308b\u3044\u306fNULLS LAST\u53e5\u3092\u4ed8\u3051\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u305d\u306e\u52d5\u4f5c\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u308b\u3002<\/p>\n<h2>Squeryl\u3067NULLS FIRST\/LAST\u3092\u6271\u3046\u306b\u306f<\/h2>\n<p>\u4ee5\u4e0b\u306e\u69d8\u306a\u306e\u3092\u4f5c\u3063\u3066\u3001<\/p>\n<pre class=\"brush: scala; code\">import org.squeryl.dsl.ast.{FunctionNode, ExpressionNode}\r\nimport org.squeryl.internals.StatementWriter\r\n\r\nobject OrderBy {\r\n  def nullsLast(col: ExpressionNode) = new FunctionNode(\"\", None, Seq(col)) {\r\n    override def doWrite(sw: StatementWriter) = {\r\n      col.write(sw)\r\n      sw.write(\" nulls last\")\r\n    }\r\n  }\r\n\r\n  def nullsFirst(col: ExpressionNode) = new FunctionNode(\"\", None, Seq(col)) {\r\n    override def doWrite(sw: StatementWriter) = {\r\n      col.write(sw)\r\n      sw.write(\" nulls first\")\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5f8c\u306f\u3001\u30af\u30a8\u30ea\u30fc\u3092\u7d44\u307f\u7acb\u3066\u308b\u6240\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3060\u3051\u3002<\/p>\n<pre class=\"brush: scala; code\">import com.example.OrderBy.nullsLast\r\n\/\/ ...\r\n        orderBy(nullsLast(someColumn) desc))<\/pre>\n<p>\u5206\u304b\u3063\u3066\u3057\u307e\u3048\u3070\u7c21\u5358\u3060\u3063\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u8a18\u4e8b\u306f\u3001ML\u3067\u8cea\u554f\u3057\u3066\u8fd4\u3063\u3066\u304d\u305f\u5185\u5bb9\u3092\u307e\u3068\u3081\u305f\u3060\u3051\u3002 ORDER BY\u3092\u6307\u5b9a\u3057\u305f\u6642\u306eNULL\u306e\u6271\u3044 SQL\u3067ORDER BY\u3092\u6307\u5b9a\u3057\u305f\u6642\u3001\u305d\u306e\u5217\u306bNULL\u304c\u3042\u3063\u305f\u5834\u5408\u3001\u305d\u306e\u884c\u306f\u3069\u3053\u306b\u6765\u308b\u306e\u304b\uff1f\u30c7\u30d5\u30a9\u30eb\u30c8\u3060\u3068\u300c\u6700\u5c0f\u306e\u5024\u300d&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[20],"tags":[905],"class_list":["post-1135","post","type-post","status-publish","format-standard","hentry","category-scala","tag-squeryl"],"_links":{"self":[{"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/posts\/1135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/comments?post=1135"}],"version-history":[{"count":5,"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/posts\/1135\/revisions"}],"predecessor-version":[{"id":1143,"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/posts\/1135\/revisions\/1143"}],"wp:attachment":[{"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/media?parent=1135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/categories?post=1135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kazu.tv\/blog\/wp-json\/wp\/v2\/tags?post=1135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}