blog: Refactoring, DTO projection, native queries.
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+= Highly Efficient Enterprise Data Access
+Matthias Andreas Benkard
+// Meta
+:experimental:
+:data-uri:
+:sectnums:
+:toc:
+:stem:
+:toclevels: 2
+:description: Slides for my Hibernate Patterns and Antipatterns talk
+:keywords: mulk
+// Settings
+:icons: font
+:source-highlighter: rouge
+
+
+[source,sql]
+----
+Hibernate:
+ select
+ post0_.id as id1_4_0_,
+ comments1_.id as id1_3_1_,
+ category3_.id as id1_2_2_,
+ post0_.author_id as author_i5_4_0_,
+ post0_.body as body2_4_0_,
+ post0_.publication_date as publicat3_4_0_,
+ post0_.title as title4_4_0_,
+ comments1_.author_name as author_n2_3_1_,
+ comments1_.post_id as post_id6_3_1_,
+ comments1_.publication_date as publicat3_3_1_,
+ comments1_.spam_status as spam_sta4_3_1_,
+ comments1_.text as text5_3_1_,
+ comments1_.post_id as post_id6_3_0__,
+ comments1_.id as id1_3_0__,
+ category3_.name as name2_2_2_,
+ categories2_.post_id as post_id1_5_1__,
+ categories2_.categories_id as categori2_5_1__
+ from
+ post post0_
+ left outer join
+ comment comments1_
+ on post0_.id=comments1_.post_id
+ left outer join
+ post_category categories2_
+ on post0_.id=categories2_.post_id
+ left outer join
+ category category3_
+ on categories2_.categories_id=category3_.id;
+----
+
+[source]
+----
+[2021-02-27 10:32:58] 60 rows retrieved starting from 1 in 263 ms (execution: 12 ms, fetching: 251 ms)
+
+; 60 = #posts (10) x #comments/post (3) x #categories (2)
+; cartesian explosion!
+----
+
+[source,sql]
+----
+post_id com_id cat_id aut_id body pubdate title author_name postid2 com_pubdate spamp com_text postid3 com_id cat_name postid4 cat_id
+4 16 44 1 "" 2021-02-27 10:32:16.129627 Post #0 Anonymous Coward 4 2021-02-27 10:32:16.133969 UNKNOWN First post 4 16 Category #1 4 44
+4 15 44 1 "" 2021-02-27 10:32:16.129627 Post #0 Anonymous Coward 4 2021-02-27 10:32:16.133963 UNKNOWN First post 4 15 Category #1 4 44
+4 14 44 1 "" 2021-02-27 10:32:16.129627 Post #0 Anonymous Coward 4 2021-02-27 10:32:16.133870 UNKNOWN First post 4 14 Category #1 4 44
+4 16 45 1 "" 2021-02-27 10:32:16.129627 Post #0 Anonymous Coward 4 2021-02-27 10:32:16.133969 UNKNOWN First post 4 16 Category #0 4 45
+4 15 45 1 "" 2021-02-27 10:32:16.129627 Post #0 Anonymous Coward 4 2021-02-27 10:32:16.133963 UNKNOWN First post 4 15 Category #0 4 45
+4 14 45 1 "" 2021-02-27 10:32:16.129627 Post #0 Anonymous Coward 4 2021-02-27 10:32:16.133870 UNKNOWN First post 4 14 Category #0 4 45
+5 19 44 2 "" 2021-02-27 10:32:16.129674 Post #1 Anonymous Coward 5 2021-02-27 10:32:16.135200 UNKNOWN First post 5 19 Category #1 5 44
+5 18 44 2 "" 2021-02-27 10:32:16.129674 Post #1 Anonymous Coward 5 2021-02-27 10:32:16.135192 UNKNOWN First post 5 18 Category #1 5 44
+5 17 44 2 "" 2021-02-27 10:32:16.129674 Post #1 Anonymous Coward 5 2021-02-27 10:32:16.135205 UNKNOWN First post 5 17 Category #1 5 44
+5 19 45 2 "" 2021-02-27 10:32:16.129674 Post #1 Anonymous Coward 5 2021-02-27 10:32:16.135200 UNKNOWN First post 5 19 Category #0 5 45
+5 18 45 2 "" 2021-02-27 10:32:16.129674 Post #1 Anonymous Coward 5 2021-02-27 10:32:16.135192 UNKNOWN First post 5 18 Category #0 5 45
+5 17 45 2 "" 2021-02-27 10:32:16.129674 Post #1 Anonymous Coward 5 2021-02-27 10:32:16.135205 UNKNOWN First post 5 17 Category #0 5 45
+6 22 44 3 "" 2021-02-27 10:32:16.129700 Post #2 Anonymous Coward 6 2021-02-27 10:32:16.136043 UNKNOWN First post 6 22 Category #1 6 44
+6 21 44 3 "" 2021-02-27 10:32:16.129700 Post #2 Anonymous Coward 6 2021-02-27 10:32:16.136038 UNKNOWN First post 6 21 Category #1 6 44
+6 20 44 3 "" 2021-02-27 10:32:16.129700 Post #2 Anonymous Coward 6 2021-02-27 10:32:16.136031 UNKNOWN First post 6 20 Category #1 6 44
+6 22 45 3 "" 2021-02-27 10:32:16.129700 Post #2 Anonymous Coward 6 2021-02-27 10:32:16.136043 UNKNOWN First post 6 22 Category #0 6 45
+6 21 45 3 "" 2021-02-27 10:32:16.129700 Post #2 Anonymous Coward 6 2021-02-27 10:32:16.136038 UNKNOWN First post 6 21 Category #0 6 45
+6 20 45 3 "" 2021-02-27 10:32:16.129700 Post #2 Anonymous Coward 6 2021-02-27 10:32:16.136031 UNKNOWN First post 6 20 Category #0 6 45
+7 25 44 1 "" 2021-02-27 10:32:16.129724 Post #3 Anonymous Coward 7 2021-02-27 10:32:16.136904 UNKNOWN First post 7 25 Category #1 7 44
+7 24 44 1 "" 2021-02-27 10:32:16.129724 Post #3 Anonymous Coward 7 2021-02-27 10:32:16.136897 UNKNOWN First post 7 24 Category #1 7 44
+7 23 44 1 "" 2021-02-27 10:32:16.129724 Post #3 Anonymous Coward 7 2021-02-27 10:32:16.136909 UNKNOWN First post 7 23 Category #1 7 44
+7 25 45 1 "" 2021-02-27 10:32:16.129724 Post #3 Anonymous Coward 7 2021-02-27 10:32:16.136904 UNKNOWN First post 7 25 Category #0 7 45
+7 24 45 1 "" 2021-02-27 10:32:16.129724 Post #3 Anonymous Coward 7 2021-02-27 10:32:16.136897 UNKNOWN First post 7 24 Category #0 7 45
+7 23 45 1 "" 2021-02-27 10:32:16.129724 Post #3 Anonymous Coward 7 2021-02-27 10:32:16.136909 UNKNOWN First post 7 23 Category #0 7 45
+8 28 44 2 "" 2021-02-27 10:32:16.129746 Post #4 Anonymous Coward 8 2021-02-27 10:32:16.137743 UNKNOWN First post 8 28 Category #1 8 44
+8 27 44 2 "" 2021-02-27 10:32:16.129746 Post #4 Anonymous Coward 8 2021-02-27 10:32:16.137739 UNKNOWN First post 8 27 Category #1 8 44
+8 26 44 2 "" 2021-02-27 10:32:16.129746 Post #4 Anonymous Coward 8 2021-02-27 10:32:16.137731 UNKNOWN First post 8 26 Category #1 8 44
+8 28 45 2 "" 2021-02-27 10:32:16.129746 Post #4 Anonymous Coward 8 2021-02-27 10:32:16.137743 UNKNOWN First post 8 28 Category #0 8 45
+8 27 45 2 "" 2021-02-27 10:32:16.129746 Post #4 Anonymous Coward 8 2021-02-27 10:32:16.137739 UNKNOWN First post 8 27 Category #0 8 45
+8 26 45 2 "" 2021-02-27 10:32:16.129746 Post #4 Anonymous Coward 8 2021-02-27 10:32:16.137731 UNKNOWN First post 8 26 Category #0 8 45
+9 31 44 3 "" 2021-02-27 10:32:16.129767 Post #5 Anonymous Coward 9 2021-02-27 10:32:16.138536 UNKNOWN First post 9 31 Category #1 9 44
+9 30 44 3 "" 2021-02-27 10:32:16.129767 Post #5 Anonymous Coward 9 2021-02-27 10:32:16.138548 UNKNOWN First post 9 30 Category #1 9 44
+9 29 44 3 "" 2021-02-27 10:32:16.129767 Post #5 Anonymous Coward 9 2021-02-27 10:32:16.138543 UNKNOWN First post 9 29 Category #1 9 44
+9 31 45 3 "" 2021-02-27 10:32:16.129767 Post #5 Anonymous Coward 9 2021-02-27 10:32:16.138536 UNKNOWN First post 9 31 Category #0 9 45
+9 30 45 3 "" 2021-02-27 10:32:16.129767 Post #5 Anonymous Coward 9 2021-02-27 10:32:16.138548 UNKNOWN First post 9 30 Category #0 9 45
+9 29 45 3 "" 2021-02-27 10:32:16.129767 Post #5 Anonymous Coward 9 2021-02-27 10:32:16.138543 UNKNOWN First post 9 29 Category #0 9 45
+10 34 44 1 "" 2021-02-27 10:32:16.129789 Post #6 Anonymous Coward 10 2021-02-27 10:32:16.139349 UNKNOWN First post 10 34 Category #1 10 44
+10 33 44 1 "" 2021-02-27 10:32:16.129789 Post #6 Anonymous Coward 10 2021-02-27 10:32:16.139354 UNKNOWN First post 10 33 Category #1 10 44
+10 32 44 1 "" 2021-02-27 10:32:16.129789 Post #6 Anonymous Coward 10 2021-02-27 10:32:16.139337 UNKNOWN First post 10 32 Category #1 10 44
+10 34 45 1 "" 2021-02-27 10:32:16.129789 Post #6 Anonymous Coward 10 2021-02-27 10:32:16.139349 UNKNOWN First post 10 34 Category #0 10 45
+10 33 45 1 "" 2021-02-27 10:32:16.129789 Post #6 Anonymous Coward 10 2021-02-27 10:32:16.139354 UNKNOWN First post 10 33 Category #0 10 45
+10 32 45 1 "" 2021-02-27 10:32:16.129789 Post #6 Anonymous Coward 10 2021-02-27 10:32:16.139337 UNKNOWN First post 10 32 Category #0 10 45
+11 37 44 2 "" 2021-02-27 10:32:16.129809 Post #7 Anonymous Coward 11 2021-02-27 10:32:16.140032 UNKNOWN First post 11 37 Category #1 11 44
+11 36 44 2 "" 2021-02-27 10:32:16.129809 Post #7 Anonymous Coward 11 2021-02-27 10:32:16.140025 UNKNOWN First post 11 36 Category #1 11 44
+11 35 44 2 "" 2021-02-27 10:32:16.129809 Post #7 Anonymous Coward 11 2021-02-27 10:32:16.140037 UNKNOWN First post 11 35 Category #1 11 44
+11 37 45 2 "" 2021-02-27 10:32:16.129809 Post #7 Anonymous Coward 11 2021-02-27 10:32:16.140032 UNKNOWN First post 11 37 Category #0 11 45
+11 36 45 2 "" 2021-02-27 10:32:16.129809 Post #7 Anonymous Coward 11 2021-02-27 10:32:16.140025 UNKNOWN First post 11 36 Category #0 11 45
+11 35 45 2 "" 2021-02-27 10:32:16.129809 Post #7 Anonymous Coward 11 2021-02-27 10:32:16.140037 UNKNOWN First post 11 35 Category #0 11 45
+12 40 44 3 "" 2021-02-27 10:32:16.129839 Post #8 Anonymous Coward 12 2021-02-27 10:32:16.140766 UNKNOWN First post 12 40 Category #1 12 44
+12 39 44 3 "" 2021-02-27 10:32:16.129839 Post #8 Anonymous Coward 12 2021-02-27 10:32:16.140786 UNKNOWN First post 12 39 Category #1 12 44
+12 38 44 3 "" 2021-02-27 10:32:16.129839 Post #8 Anonymous Coward 12 2021-02-27 10:32:16.140779 UNKNOWN First post 12 38 Category #1 12 44
+12 40 45 3 "" 2021-02-27 10:32:16.129839 Post #8 Anonymous Coward 12 2021-02-27 10:32:16.140766 UNKNOWN First post 12 40 Category #0 12 45
+12 39 45 3 "" 2021-02-27 10:32:16.129839 Post #8 Anonymous Coward 12 2021-02-27 10:32:16.140786 UNKNOWN First post 12 39 Category #0 12 45
+12 38 45 3 "" 2021-02-27 10:32:16.129839 Post #8 Anonymous Coward 12 2021-02-27 10:32:16.140779 UNKNOWN First post 12 38 Category #0 12 45
+13 43 44 1 "" 2021-02-27 10:32:16.129860 Post #9 Anonymous Coward 13 2021-02-27 10:32:16.141651 UNKNOWN First post 13 43 Category #1 13 44
+13 42 44 1 "" 2021-02-27 10:32:16.129860 Post #9 Anonymous Coward 13 2021-02-27 10:32:16.141655 UNKNOWN First post 13 42 Category #1 13 44
+13 41 44 1 "" 2021-02-27 10:32:16.129860 Post #9 Anonymous Coward 13 2021-02-27 10:32:16.141642 UNKNOWN First post 13 41 Category #1 13 44
+13 43 45 1 "" 2021-02-27 10:32:16.129860 Post #9 Anonymous Coward 13 2021-02-27 10:32:16.141651 UNKNOWN First post 13 43 Category #0 13 45
+13 42 45 1 "" 2021-02-27 10:32:16.129860 Post #9 Anonymous Coward 13 2021-02-27 10:32:16.141655 UNKNOWN First post 13 42 Category #0 13 45
+13 41 45 1 "" 2021-02-27 10:32:16.129860 Post #9 Anonymous Coward 13 2021-02-27 10:32:16.141642 UNKNOWN First post 13 41 Category #0 13 45
+----