Eclipsehibernate使用外键一对一映射中出现错误ERROR: 不能将值 NULL 插入列 'DEPT_ID'，表 'test.dbo.DEPARTMENTS'；列不允许有 Null 值。INSERT 失败。
目录结构：
配置文件：hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 配置连接数据库的基本信息 -->
<property name="connection.username">sa</property>
<property name="connection.password">131420</property>
<property name="connection.url">jdbc:sqlserver://localhost:1433;databaseName=test;SelectMethod=cursor;</property>
<property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<property name="dialect">org.hibernate.dialect.SQLServerDialect</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- 设置hibernate的事务隔离级别 -->
<property name="connection.isolation">2</property>
<!-- 删除对象后，使其OID置为null -->
<property name="use_identifier_rollback">true</property>
<!-- 指定自动生成数据表的策略,即当我们运行程序时hibernate帮助我们在数据库中自动生成数据表 -->
<property name="hbm2ddl.auto">update</property>
<!-- 配置c3p0数据源 -->
<property name="hibernate.c3p0.max_size">10</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="c3p0.acquire_increment">2</property>
<property name="c3p0.idle_test_period">2000</property>
<property name="c3p0.timeout">2000</property>
<property name="c3p0.max_statements">10</property>
<property name="hibernate.jdbc.fetch_size">100</property>
<property name="hibernate.jdbc.batch_size">30</property>
<mapping resource="com/liufuchen/hibernate/one2one/foreign/Manager.hbm.xml"/>
<mapping resource="com/liufuchen/hibernate/one2one/foreign/Department.hbm.xml"/>
实体类：
Manager.java
package com.liufuchen.hibernate.one2one.foreign;
public class Manager {
private Integer mgrId;
private String mgrName;
private Department dept;
public Integer getMgrId() {
return mgrId;
}
public void setMgrId(Integer mgrId) {
this.mgrId = mgrId;
}
public String getMgrName() {
return mgrName;
}
public void setMgrName(String mgrName) {
this.mgrName = mgrName;
}
public Department getDept() {
return dept;
}
public void setDept(Department dept) {
this.dept = dept;
}
}
Departmen.java
package com.liufuchen.hibernate.one2one.foreign;
public class Department {
private Integer deptId;
private String deptName;
private Manager mgr;
public Integer getDeptId() {
return deptId;
}
public void setDeptId(Integer deptId) {
this.deptId = deptId;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
public Manager getMgr() {
return mgr;
}
public void setMgr(Manager mgr) {
this.mgr = mgr;
}
}
映射文件：
Manager.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2016-1-8 19:59:21 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping package="com.liufuchen.hibernate.one2one.foreign">
<class name="Manager" table="MANAGERS">
<id name="mgrId" type="java.lang.Integer">
<column name="MGR_ID" />
<generator class="native" />
</id>
<property name="mgrName" type="java.lang.String">
<column name="MGR_NAME" />
</property>
<one-to-one name="dept" class="Department" property-ref="mgr"></one-to-one>
</class>
</hibernate-mapping>
Department.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2016-1-8 19:59:21 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping package="com.liufuchen.hibernate.one2one.foreign">
<class name="Department" table="DEPARTMENTS">
<id name="deptId" type="java.lang.Integer">
<column name="DEPT_ID" />
<generator class="native" />
</id>
<property name="deptName" type="java.lang.String">
<column name="DEPT_NAME" />
</property>
<many-to-one name="mgr" class="Manager" column="MGR_ID" unique="true"></many-to-one>
</class>
</hibernate-mapping>
