SpringBoot 官方文档示例（90）：整合jpa时，自定义名称映射

在Spring Boot整合jpa时默认将实体类的名称的驼峰映射成下划线的表名。也就是使用CamelCaseToUnderscoresNamingStrategy。
可以通过自定义的方式来指定上述的映射规则，可以定义一个bean,返回PhysicalNamingStrategy的实例。

@Bean
    PhysicalNamingStrategy f(){
        return new PhysicalNamingStrategy() {
            @Override
            public Identifier toPhysicalCatalogName(Identifier name, JdbcEnvironment jdbcEnvironment) {
                return name;
            }

            @Override
            public Identifier toPhysicalSchemaName(Identifier name, JdbcEnvironment jdbcEnvironment) {
                return name;
            }

            @Override
            public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment jdbcEnvironment) {
                String columnName = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, name.getText());
                Identifier identifier = new Identifier(columnName+"_test", false);
                return identifier;
            }

            @Override
            public Identifier toPhysicalSequenceName(Identifier name, JdbcEnvironment jdbcEnvironment) {
                return name;
            }

            @Override
            public Identifier toPhysicalColumnName(Identifier name, JdbcEnvironment jdbcEnvironment) {
                return name;
            }


        };
    }

其中表名的映射规则为：驼峰转下划线再加_test

#######################################################
定义如下的bean,可以将StudentInfo对应到表名Student_Info

@Bean
    public CamelCaseToUnderscoresNamingStrategy caseSensitivePhysicalNamingStrategy()
    {
        return new CamelCaseToUnderscoresNamingStrategy() {
            @Override
            protected boolean isCaseInsensitive(JdbcEnvironment jdbcEnvironment) {
                return false;
            }
        };
    }

定义如下的bean,可以将StudentInfo对应到表名StudentInfo(也就是直接映射）

@Bean
    PhysicalNamingStrategyStandardImpl myPhysicalNamingStrategy() {
        return new PhysicalNamingStrategyStandardImpl();
    }

也可以通过spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl 这种方式来指定映射类