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[英]java.sql.SQLException: Data truncated for column 'gender' at row 1 for enum
[英]java.sql.SQLException: Data truncated for column
我是Java编程的新手。 我的课程中有一个枚举数据类型:
public class Persons {
private String name;
private String family;
private Date birthDate;
public enum degree {Bsd, Msd, prof};
private degree degree;
...
}
在我的MySQL数据库中,我有一个学位字段为: ENUM('Bsd','Mds','prof')
,我的hibernate映射是这样的:
<class name="Entity.Professor" table="tbl_professor">
<id column="ProfessorId" name="ProfessorId"/>
<property column="name" name="name"/>
<property column="family" name="family"/>
<property column="birthDate" name="birthDate"/>
<property column="degree" name="degree"/>
</class>
当我想在我的表中插入新记录时,我收到此错误:
Hibernate: insert into tbl_professor (name, family, birthDate, degree, ProfessorId) values (?, ?, ?, ?, ?)
Apr 26, 2013 6:15:24 PM org.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 1265, SQLState: 01000
Apr 26, 2013 6:15:24 PM org.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: Data truncated for column 'degree' at row 1
Apr 26, 2013 6:15:24 PM org.hibernate.event.def.AbstractFlushingEventListener performExecutions
SEVERE: Could not synchronize database state with session
org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at DAO.ProfessorDAO.createProfessor(ProfessorDAO.java:21)
at Entity.Test.main(Test.java:39)
Caused by: java.sql.BatchUpdateException: Data truncated for column 'degree' at row 1
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2028)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1451)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
... 9 more
Caused by: java.sql.SQLException: Data truncated for column 'degree' at row 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2427)
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1980)
... 12 more
Exception in thread "main" org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141)
谁能帮我? 我真的很困惑enum
数据类型。
数据截断是当你添加比数据库列的最大列尺寸长(在你的案件记录degree
)。
由于您的MySQL ENUM for DEGREE列有3种类型,您可以使用@Enumerated
对枚举进行@Enumerated
,如下所示:
@Enumerated(EnumType.STRING)
private degree degree;
EnumType
更多信息。 你需要在hibernate中以不同方式映射枚举,Hibernate提供了org.hibernate.type.EnumType来映射枚举类型
<property name="degree">
<type name="org.hibernate.type.EnumType">
<param name="enumClass">pkg.degree</param>
</type>
</property>
如果要存储字符串而不是索引1,2等,则需要使用12
12 - java.sql.Types.VARCHAR
好吧,你得到一个数据截断错误,所以我会检查你的MySQL列的允许长度。 通常,如果该字段中的数据大于Hibernate / JPA映射或允许的db列的长度,则会看到此错误。
一种解决方案是不使用enum类型的mysql。 另一种选择是普通的字符串,甚至更好的是一个id为关系的额外表。
它有几个缺点。 主要是维持它。 您无法轻松更改订单或删除其中的内容
如果你google for mysql这个页面是第3个,原因是: http : //komlenic.com/244/8-reasons-why-mysqls-enum-data-type-is-evil/
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