JPA-hibernate @Table(name =“动态表名” ）

记录一下hibernate动态设置表名的一些坑

首先maven引入等不贴了，到这一步，一般来说，maven肯定引入了

首先需要自定义一个类，主要用来解析表达式

import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl;
import org.hibernate.engine.jdbc.env.spi.JdbcEnvironment;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.expression.BeanFactoryAccessor;
import org.springframework.context.expression.BeanFactoryResolver;
import org.springframework.expression.Expression;
import org.springframework.expression.ParserContext;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.stereotype.Component;
 
/**
 * 自定义命名策略(实现支持解析#{javaConfig.property}获取表名功能 )
 *
 * @author  Java大笨笨
 * @since 2019-03-26
 */
@Component
public class MySpringPhysicalNamingStrategy extends PhysicalNamingStrategyStandardImpl
        implements ApplicationContextAware {
 
    private final StandardEvaluationContext context = new StandardEvaluationContext();
 
    private final SpelExpressionParser parser = new SpelExpressionParser();
 
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.context.addPropertyAccessor(new BeanFactoryAccessor());
        this.context.setBeanResolver(new BeanFactoryResolver(applicationContext));
        this.context.setRootObject(applicationContext);
    }
 
    @Override
    public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment jdbcEnvironment) {
        String nameStr = name.getText();
        if(nameStr.contains(ParserContext.TEMPLATE_EXPRESSION.getExpressionPrefix())){
            //参考SimpleElasticsearchPersistentEntity 实现思想,将tableName参数的值支持表达式获取
            Expression expression = this.parser.parseExpression(nameStr, ParserContext.TEMPLATE_EXPRESSION);
            return Identifier.toIdentifier((String)expression.getValue(this.context, String.class));
        }else {
            //默认方式不变
            return super.toPhysicalTableName(name, jdbcEnvironment);
        }
    }
 
}

　　注意，这个类要继承一个PhysicalNamingStrategyStandardImpl，这个取决于你目前项目中的naming.physical-strategy，我之前用的是PhysicalNamingStrategyStandardImpl，所以这里继承并重新toPhysicalTableName方法。

yml配置

spring:
    jpa:
        database: mysql
        show-sql: true
        hibernate:
            ddl-auto: none
        database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
        properties:
            hibernate.format_sql: false
            hibernate.naming.physical-strategy: xxxxx你的包名.MySpringPhysicalNamingStrategy
            hibernate.cache.use_second_level_cache: false
            hibernate.search.default.directory_provider: filesystem
            hibernate.search.default.indexBase: c:\\xxxx

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
 
/**
 * @author java大笨笨
 * @create 2021-02-23 16:07
 */
@Component("optionsConfig")
public class OptionsConfig {
 
    @Value("${site.options.table_name}")
    private String optionsTableName;
 
 
    public String getOptionsTableName() {
        return optionsTableName;
    }
 
    public void setOptionsTableName(String optionsTableName) {
        this.optionsTableName = optionsTableName;
    }
}

　　注意@Component("optionsConfig")，给个名字，否则会在表达式解析时候找不到这个类

*/
@Entity
@Table(name = "#{optionsConfig.optionsTableName}")
public class Options {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
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