4
當前的代碼:的EclipseLink延長JOIN子句
CriteriaQuery criteriaQuery = cb.createQuery(MinutisPreke.class);
Root<MinutisPreke> from = criteriaQuery.from(MinutisPreke.class);
Join<LankomumasDiena, MinutisPreke> ld = from.join("lankomumasDiena", JoinType.LEFT);
cb.and(cb.equal(ld.get("intervalas"), 7));
生成以下查詢:
SELECT COUNT(t0.pr_id) FROM preke AS t0
LEFT OUTER JOIN lankomumas AS t1
ON (t1.pr_id = t0.pr_id)
WHERE (t1.intervalas = 7)
如何添加語句中LEFT OUTER JOIN 使用條件查詢所以我條款代碼將生成此查詢:
SELECT COUNT(t0.pr_id) FROM preke AS t0
LEFT OUTER JOIN lankomumas AS t1
ON (t1.pr_id = t0.pr_id) AND (t1.intervalas = 7)
編輯1: 如果你沒有看到在第一和第二querys任何差異,請閱讀此線程: SQL join: where clause vs. on clause
是可以安全使用的每日構建? – Minutis