解决（springboot项目）mysql表名大写，造成jpa Table doesn't exist问题

这个问题有2种解决方法：

我的报错是：

 java.sql.SQLSyntaxErrorException: Table 'gaei_ms.gaei_work_task' doesn't exist

方法一：

转自：https://confluence.atlassian.com/fishkb/table-xxx-doesn-t-exist-error-with-mysql-server-302810019.html

2012-09-05 10:12:30,728 ERROR [btpool0-472 ] fisheye.app TotalityFilter-logExceptionDetails - Exception "com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'fecru.AO_B434B9_WEB_HOOK' doesn't exist" (net.java.ao.sql.ActiveObjectSqlException) while processing "/plugins/servlet/webhooks/list" (Referer:"https://fisheye.bln.native-instruments.de/admin/viewServerSettings.do")
net.java.ao.sql.ActiveObjectSqlException: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'fecru.AO_B434B9_WEB_HOOK' doesn't exist
	at com.atlassian.activeobjects.internal.EntityManagedActiveObjects.find(EntityManagedActiveObjects.java:114)
	at com.atlassian.activeobjects.osgi.DelegatingActiveObjects.find(DelegatingActiveObjects.java:71)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
...
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'fecru.AO_B434B9_WEB_HOOK' doesn't exist

原因：

MySQL对lower_case_table_names使用区分大小写的表名比较设置  （可能值为'0'）。但是，FishEye在表名  FE-4276中不一致-数据库表OPEN的大小写不一致。您可以使用以下查询确认设置： 

show variables like 'lower_case_table_names'; 

解决：

1.  在MySQL中设置  lower_case_table_names的值为'0'
2. 重新启动MySQL和FishEye / Crucible。

方法二：

我的情况是springboot项目，配置文件的改法略有不同：

我的改法是在配置文件中加上这一行：

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

以下转自：https://blog.csdn.net/Halleycomett/article/details/78638639

报错信息

org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet


Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table XXX doesn't exist

报错原因调查

mysql里实际表名都是大写

尝试在entity上标记表名大写，实际测试无效，仍然找不到表

@Entity
@Data
@Table(name = "T_BASE_ORDER_PRINT_CLIENT")
public class MerchantPrinter {

    @Id
    @Column(name = "print_client_id")
    private String id;

    @Column(name = "merchant_id")
    private String merchantId;

    private String imei;

}

最终的解决方案

在spring jpa配置中增加physical-strategy配置解决问题

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://XXX:3306/dbname
    username: root
    password: *******
    schema:
  jpa:
    hibernate:
      ddl-auto: none
      naming:
        physical-strategy:  org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
    show-sql: true

physical naming strategy ：used to convert a “logical name” (either implicit or explicit) name of a table or column into a physical name (e.g. following corporate naming guidelines) 
physical naming strategy：物理命名策略，用于转换“逻辑名称”(隐式或显式)的表或列成一个物理名称