我尝试通过休眠在 Mysql DB 中插入值
Hibernate: insert into EMPLOYEEM (FIRSTNAME, LASTNAME) values (?, ?)
Hibernate: insert into MEETING (MEETING_DATE, SUBJECT) values (?, ?)
Hibernate: insert into MEETING (MEETING_DATE, SUBJECT) values (?, ?)
Hibernate: insert into EMPLOYEEM (FIRSTNAME, LASTNAME) values (?, ?)
Hibernate: insert into EMPLOYEE_MEETING (EMPLOYEE_ID, MEETING_ID) values (?, ?)
Hibernate: insert into EMPLOYEE_MEETING (EMPLOYEE_ID, MEETING_ID) values (?, ?)
Hibernate: insert into EMPLOYEE_MEETING (EMPLOYEE_ID, MEETING_ID) values (?, ?)
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:69)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:202)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:230)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:144)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1007)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:354)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at com.atom.javah3M2M.Main.main(Main.java:34)
Caused by: java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key constraint fails (`test`.`employee_meeting`, CONSTRAINT `FK_EMPLOYEE` FOREIGN KEY (`employee_id`) REFERENCES `employee` (`employee_id`))
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2054)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1467)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195)
... 8 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`test`.`employee_meeting`, CONSTRAINT `FK_EMPLOYEE` FOREIGN KEY (`employee_id`) REFERENCES `employee` (`employee_id`))
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4187)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4119)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2006)
... 11 more
表结构如下
表员工m
================
员工 ID、名字、姓氏
employee_id bigint(10) PK
名字 varchar(50)
姓氏 varchar(50)
餐桌会议
==============
meeting_id、主题、会议日期
meeting_id bigint(20) PK
主题 varchar(50)
会议日期日期
表employee_meeting
=======================
id、employee_id、meeting_id
id int(11) PK
员工 ID 大整数（20）
meeting_id bigint(20)
员工.hbm
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.atom.javah3M2M">
<class name="com.atom.javah3M2M.Employeem" table="EMPLOYEEM">
<id name="empid" column="EMPLOYEE_ID">
<generator class="native" />
</id>
<property name="fname" column ="FIRSTNAME"/>
<property name="lname" column="LASTNAME" />
<set name="meetings" table="EMPLOYEE_MEETING"
inverse="false" lazy="true" fetch="select" cascade="save-update">
<key column="EMPLOYEE_ID" not-null="true" />
<many-to-many entity-name="com.atom.javah3M2M.Meeting">
<column name="MEETING_ID" not-null="true" />
</many-to-many>
</set>
</class>
</hibernate-mapping>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.atom.javah3M2M">
<class name="com.atom.javah3M2M.Meeting" table="MEETING">
<id name="meetingId" type="java.lang.Long" column="MEETING_ID">
<generator class="native" />
</id>
<property name="meetingDate" type="date" column="MEETING_DATE"/>
<property name="subject" column="SUBJECT" />
<set name="employees" table="EMPLOYEE_MEETING"
inverse="true" lazy="true" fetch="select">
<key column="MEETING_ID" />
<many-to-many entity-name="com.atom.javah3M2M.Employeem">
<column name="EMPLOYEE_ID" not-null="true" />
</many-to-many>
</set>
</class>
</hibernate-mapping>
package com.atom.javah3M2M;
import java.sql.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
public class Main {
public static void main(String[] args) {
SessionFactory sf = HibernateUtil.getSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
Meeting meeting1 = new Meeting("Quaterly Sales meeting",new Date(System.currentTimeMillis()));
Meeting meeting2 = new Meeting("Weekly Status meeting",new Date(System.currentTimeMillis()));
Employeem employee1 = new Employeem("Sergey", "Brin");
Employeem employee2 = new Employeem("Larry", "Page");
employee1.getMeetings().add(meeting1);
employee1.getMeetings().add(meeting2);
employee2.getMeetings().add(meeting1);
session.save(employee1);
session.save(employee2);
session.getTransaction().commit();
session.close();
}
}