我有一个日本邮政局实体,在该处设有一个博览场。 我想写一下JPQL的问询,以 f清实体的花).时间(我不想把镜子放在记忆中)。
例如,在Oracle,我可以使用以下卡片:
SELECT length(blob_field) FROM my_table WHERE id = ?
How can I fetch the blob s length with JPQL?
我们不能。 JPQL 长期运行的字体数量和树脂中的 by数量与这一定义相符。
但是,你可以用长的时间处理作为CLOB(Cchar/Characters阵列或Sting as Java型)持续存在的特性。
//can use length function for CLOBs:
@Lob char[] a;
@Lob Character b;
@Lob String c;
//can not use length function for BLOBs:
@Lob byte[] d;
@Lob Byte e;
@Lob Serializable f;
如果使用EclipseLink,你可以利用JPQL的“FUNC”功能确定数据库的功能。
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