{"id":138,"date":"2020-01-23T10:14:10","date_gmt":"2020-01-23T10:14:10","guid":{"rendered":"http:\/\/buki.io\/?p=138"},"modified":"2021-05-11T10:51:54","modified_gmt":"2021-05-11T09:51:54","slug":"jpql-with-left-outer-join","status":"publish","type":"post","link":"http:\/\/buki.io\/?p=138","title":{"rendered":"JPQL with left outer join"},"content":{"rendered":"

To remind my self!
\nMain.class
\n@OneToOne @JoinColumn(name = \"pk_column_name_in_main_table\", referencedColumnName = \"column_name_in_depeding_table\", insertable = false, updatable = false) public Description getDescription() { return this.description; }
\n<\/code>
\nDepending.class
\n@Id
\n@Column(name = \" column_name_in_depeding_table\", nullable = true)
\npublic int getDescriptionId() { return descriptionId; }
\n@Column(name =\"language) Public String getLanguage(){return language;}
\n<\/code>
\nNow if I want something like<\/p>\n

Select * from main m join depending d on m.pk_column_in_main_table = d.column_name_in_depending_table where d.column_name_in_depending_table is null
\n<\/code>
\nYou have to put the where-criteria directly into the „left join“ condition of the jqpl query. If you do it like in SQL and put it in the where-clause, JPA (or at least Eclipselink, haven’t tried Hibernate) creates and „old-style“ (ANSI-89) style query, where the join condition is put in the where-clause and you won’t get any results!<\/p>\n

@NamedQueries({ @NamedQuery(name = Main.FIND_BY_ID, query = \"SELECT c FROM Main c left join c.description des on des.language = :language where c.id = :id\")} <\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

To remind my self! Main.class @OneToOne @JoinColumn(name = „pk_column_name_in_main_table“, referencedColumnName = „column_name_in_depeding_table“, insertable = false, updatable = false) public Description getDescription() { return this.description; } Depending.class @Id @Column(name = “ column_name_in_depeding_table“, nullable = true) public int getDescriptionId() { return descriptionId; } @Column(name =“language) Public String getLanguage(){return language;} Now if I want something like Select * … <\/p>\n

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