我有一个实体,其ID是在SQL Server数据库中生成的GUID(它是我无法更改模式的第三方数据库),因此字段被定义;尝试检索插入的行时插入失败
@Id
@GenericGenerator(name="generator", strategy="guid", parameters = {})
@GeneratedValue(generator ="generator")
@Column(name="FarmID")
public String getId() {
return id;
}
当我创建一个新的实体,并保存它时,ID首先正确地GUIDGenerator调用NEWID()产生,则该行被使用所生成的ID作为参数值插入。然而,在插入之后,Hibernate尝试检索新插入的行,但失败,结果发现它使用了空白的id值 - 这里是跟踪日志;
[main] AbstractBatcher DEBUG about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
[main] SQL DEBUG
select
newid()
[main] AbstractBatcher TRACE preparing statement
[main] GUIDGenerator DEBUG GUID identifier generated: 5B5495B4-FFE3-4112-B079-4FB799320BA7
[main] AbstractBatcher DEBUG about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
[main] AbstractBatcher TRACE closing statement
[main] ConnectionManager TRACE registering flush begin
[main] AbstractBatcher DEBUG about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
[main] SQL DEBUG
insert
into
Farm
(FarmBusinessID, FarmName, PortalFarm, FarmID)
values
(?, ?, ?, ?)
[main] AbstractBatcher TRACE preparing statement
[main] BasicBinder TRACE binding parameter [1] as [VARCHAR] - F2542B84-82E4-4DF6-BDBB-E830BFE5DDC1
[main] BasicBinder TRACE binding parameter [2] as [VARCHAR] - XXXXXX XXXXX (XXX)
[main] BasicBinder TRACE binding parameter [3] as [BIT] - true
[main] BasicBinder TRACE binding parameter [4] as [VARCHAR] - 5B5495B4-FFE3-4112-B079-4FB799320BA7
[main] AbstractBatcher DEBUG about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
[main] AbstractBatcher TRACE closing statement
[main] ConnectionManager TRACE registering flush end
[main] HQLQueryPlan TRACE find: select id from agronomy.model.hub.Farm where id = :id
[main] AbstractBatcher DEBUG about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
[main] SQL DEBUG
select
farm0_.FarmID as col_0_0_
from
Farm farm0_
where
farm0_.FarmID=?
[main] AbstractBatcher TRACE preparing statement
[main] BasicBinder TRACE binding parameter [1] as [VARCHAR] -
[main] AbstractBatcher DEBUG about to open ResultSet (open ResultSets: 0, globally: 0)
[main] AbstractBatcher DEBUG about to close ResultSet (open ResultSets: 1, globally: 1)
[main] AbstractBatcher DEBUG about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
[main] AbstractBatcher TRACE closing statement
[main] JDBCExceptionReporter WARN SQL Error: 8169, SQLState: S0002
[main] JDBCExceptionReporter ERROR Conversion failed when converting from a character string to uniqueidentifier.
我不知道,我明确地调用,去年SELECT(失败),所以我不知道在哪里可以看明白为什么它的失败。 SQL错误粗略地翻译为“你不能使用空字符串作为uniqueidentifier值”,这很有意义。