SQL命令中的TIMESTAMP和CURRENT_TIMESTAMP问题

我在创建使用CURRENT_TIMESTAMP指定日期的表时遇到了一些问题。我需要这个，因为我使用java jpa实体来按日期检索它们。如果我运行到本地h2数据库，我没有问题。SQL命令中的TIMESTAMP和CURRENT_TIMESTAMP问题

在这个例子中：

INSERT INTO Post (id, title, slug, teaser, body, author_id, posted_on) 
VALUES (1, 'Spring Boot Rocks!', 'spring-boot-rocks', @TEASER, @BODY, 1, CURRENT_TIMESTAMP);

一切都被创建和完美的作品，但是当我尝试在我连接了Azure的SQL数据库一样查询到我的错误

Failed to execute query. Error: Cannot insert an explicit value into a timestamp column. Use INSERT with a column list to exclude the timestamp column, or insert a DEFAULT into the timestamp column.

如果我尝试将CURRENT_TIMESTAMP更改为TIMESTAMP，我会得到;

Failed to execute query. Error: Invalid column name 'TIMESTAMP'. If I change it to DEFAULT as the previous error suggests the tables get created but I can't retrieve them by date of creation since DEFAULT is not a time value.

完整的查询

SET IDENTITY_INSERT author ON 

insert into author(id,first_name,last_name,email) values (1,'Dan','Vega','[email protected]'); 
insert into author(id,first_name,last_name,email) values (2,'John','Smith','[email protected]'); 

SET IDENTITY_INSERT author OFF 
SET IDENTITY_INSERT post ON 

DECLARE @TEASER varchar(4000) = 'text...' 
DECLARE @BODY varchar(4000) = 'text...' 

insert into Post(id,title,slug,teaser,body,author_id,posted_on) values (1,'Spring Boot Rocks!','spring-boot-rocks',@TEASER,@BODY,1,CURRENT_TIMESTAMP); 
insert into Post(id,title,slug,teaser,body,author_id,posted_on) values (2,'Spring Data Rocks!','spring-data-rocks',@TEASER,@BODY,1,CURRENT_TIMESTAMP); 
insert into Post(id,title,slug,teaser,body,author_id,posted_on) values (3,'John Blog Post 1','john-blog-post-1',@TEASER,@BODY,2,CURRENT_TIMESTAMP); 
insert into Post(id,title,slug,teaser,body,author_id,posted_on) values (4,'John Blog Post 2','john-blog-post-2',@TEASER,@BODY,2,CURRENT_TIMESTAMP); 
insert into Post(id,title,slug,teaser,body,author_id,posted_on) values (5,'John Blog Post 3','john-blog-post-3',@TEASER,@BODY,2,CURRENT_TIMESTAMP); 
insert into Post(id,title,slug,teaser,body,author_id,posted_on) values (6,'Refactoring our Spring Data Project','refactoring-spring-data-project',@TEASER,@BODY,1,CURRENT_TIMESTAMP); 

SET IDENTITY_INSERT post OFF

来源

2017-08-16 MrSir

在SQL Server（及SQL Azure）的TIMESTAMP数据类型是不什么ISO/ANSI标准定义（这是SQL原来的Sybase遗产的剩服务器）。

这真的只是乐观并发检查的二进制计数器 - 它有NOTHING做一个日期和/或时间了！

要储存和处理日期和时间，使用的数据类型DATE（只是日期 - 没时间），或DATETIME2(n)日期&时间，而不是

来源

2017-08-16 16:00:50

如果我取代'和'DATE'我有CURRENT_TIMESTAMP' '无法执行查询。错误：无效的列名'DATE'。' – MrSir

@MrSir：您不必用任何东西来替换'CURRENT_TIMESTAMP' - 您需要**更改**表中'posting_on'列的数据类型** ** （从'TIMESTAMP'到例如'DATETIME2（0）'）你将数据插入！ –

我试图改变它与查询'ALTER TABLE后 ALTER COLUMN posted_on DATETIME2（0）; '我有'不能更改列'posted_on'，因为它是时间戳。' – MrSir

通过重新使用application.properties spring.jpa.hibernate.ddl-auto=create-drop数据库和更换

固定

@CreatedDate @Column(columnDefinition = "TIMESTAMP") 
private Date postedOn;

到

@CreatedDate @Column(columnDefinition = "DATETIME2(0)") 
private Date postedOn;

来源

2017-08-18 17:07:09 MrSir

SQL命令中的TIMESTAMP和CURRENT_TIMESTAMP问题

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