回答編集履歴
1
querybuilderを使うことに
test
CHANGED
@@ -22,4 +22,88 @@
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-
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実際にはqueryBuilder(squirrel)を使うのが一番いいのかなとわかりました
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```go
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modifiedBefore := time.Now()
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tags := []string{"go", "rust", "typescript"}
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url := "//"
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n := 100
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tagsStmt := sq.Expr("CONCAT(DISTINCT tags.name SEPARATOR ',')")
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q := sq.Select("id",
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"account_id",
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"pairs",
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"complete_rate",
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"point",
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"title",
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"description",
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"created",
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"modified").
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Column("CONCAT(DISTINCT urls.url SEPARATOR ',') as urls").
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// Column("(DISTINCT tags.name SEPARATOR ',') as tags").
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Column(sq.Alias(tagsStmt, "tags")).
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From("contents").
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LeftJoin("contents_urls ON contents_urls.content_id = contents.id").
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LeftJoin("contents_tags ON contents_tags.content_id = contents.id").
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LeftJoin("tags ON tags.id = contents_tags.tag_id").
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Where(sq.Lt{"modified": modifiedBefore}).
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Where(sq.Eq{"tags.name": tags}).
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Where("urls.url like ?", fmt.Sprint("%", url, "%")).
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GroupBy("contents.id").
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Limit(uint64(n))
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fmt.Println(q.ToSql())
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```
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実行結果
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```
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SELECT id, account_id, pairs, complete_rate, point, title, description, created, modified, CONCAT(DISTINCT urls.url SEPARATOR ',') as urls, (CONCAT(DISTINCT tags.name SEPARATOR ',')) AS tags FROM contents LEFT JOIN contents_urls ON contents_urls.content_id = contents.id LEFT JOIN contents_tags ON contents_tags.content_id = contents.id LEFT JOIN tags ON tags.id = contents_tags.tag_id WHERE modified < ? AND tags.name IN (?,?,?) AND urls.url like ? GROUP BY contents.id LIMIT 100
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[go rust typescript %//%] <nil>
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```
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プレースホルダと引数の調整を自動化しますし。
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