Hibernate 命名规范从4.3.11.Final到5.0.2.Final时 ImprovedNamingStrategy问题

升级hibernate版本时, 原有数据库的表字段名都是带有下划线的如:employee_id,first_name等

但升级hibernate后数据库映射出错,经过查找原来是Hibernate5.1相关配置变了.

解决的方法: 建新一个类实现PhysicalNamingStrategy方法,重写自已的命名规则

以下是我的xml文件配置 

关键代码行:

<!--建表的命名规则Hibernate5.0.2支持 自定义类的数据库字段名带有下划线分隔-->
<prop key="hibernate.physical_naming_strategy">com.imooc.util.ImprovedNamingStrategy</prop>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
  <!--1 配置数据源-->
  <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/spring_data?useUnicode=true&characterEncoding=UTF-8&useOldAliasMetadataBehavior=true"/>
    <property name="username" value="root"/>
    <property name="password" value="root"/>
  </bean>
  <!--2 配置EntityManagerFactory
  基本对象的构建:通过CriteriaBuilder对象获得CriteriaBuilder对象获得CriteriaQuery实例的from方法可以获得Root实例
  -->
  <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
    <property name="packagesToScan" value="com.imooc"/>
    <property name="jpaProperties">
      <props>
        <!--建表的命名规则Hibernate4.3.11支持 生成的数据库字段名带有下划线分隔-->
        <!--<prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>-->
        <!--建表的命名规则Hibernate5.0.2支持 自定义类实现数据库字段名带有下划线分隔-->
        <prop key="hibernate.physical_naming_strategy">com.imooc.util.ImprovedNamingStrategy</prop>
        <!--数据库方言-->
        <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
        <!--<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>-->
        <prop key="hibernate.show_sql">true</prop>
        <!--hibernate sql语句格式化-->
        <prop key="hibernate.format_sql">true</prop>
        <!--自动根据实体创建表-->
        <prop key="hibernate.hbm2ddl.auto">create</prop>
      </props>
    </property>
  </bean>

  <!--3 配置事务管理器-->
  <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
  </bean>
  <!--4 配置支持注释的事务-->
  <tx:annotation-driven transaction-manager="transactionManager"/>
  <!--5 配置spring data-->
  <jpa:repositories base-package="com.imooc" entity-manager-factory-ref="entityManagerFactory"/>
  <!--6 配置spring 注释扫描-->
  <context:component-scan base-package="com.imooc"/>
</beans>

以下是我的实现类

package com.imooc.util;

import org.apache.commons.lang.StringUtils;
import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.boot.model.naming.PhysicalNamingStrategy;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;

/**
 * @author 向亚林
 * 2018/2/9 16:53
 */
public class ImprovedNamingStrategy implements PhysicalNamingStrategy {

	@Override
	public Identifier toPhysicalCatalogName(Identifier identifier, JdbcEnvironment jdbcEnvironment) {
		return convert(identifier);
	}
	@Override
	public Identifier toPhysicalSchemaName(Identifier identifier, JdbcEnvironment jdbcEnvironment) {
		return convert(identifier);
	}
	@Override
	public Identifier toPhysicalTableName(Identifier identifier, JdbcEnvironment jdbcEnvironment) {
		return convert(identifier);
	}
	@Override
	public Identifier toPhysicalSequenceName(Identifier identifier, JdbcEnvironment jdbcEnvironment) {
		return convert(identifier);
	}
	@Override
	public Identifier toPhysicalColumnName(Identifier identifier, JdbcEnvironment jdbcEnvironment) {
		return convert(identifier);
	}

	private Identifier convert(Identifier identifier) {
		if (identifier == null || StringUtils.isBlank(identifier.getText())) {
			return identifier;
		}
		String regex = "([a-z])([A-Z])";
		String replacement = "$1_$2";
		String newName = identifier.getText().replaceAll(regex, replacement).toLowerCase();
		return Identifier.toIdentifier(newName);
	}
}