CREATE TABLE merchant_purchase_stat_time ( id bigint unsigned NOT NULL AUTO_INCREMENT, stat_time datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '统计时间', PRIMARY KEY (id) USING BTREE ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci ROW_FORMAT=DYNAMIC COMMENT='店铺采购统计时间';根据表结构生成java的实体类，持久层，业务层

好的，根据表结构，以下是对应的Java实体类、持久层、业务层代码：

1. Java实体类代码：

import java.util.Date;

public class MerchantPurchaseStatTime {
    private Long id;
    private Date statTime;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Date getStatTime() {
        return statTime;
    }

    public void setStatTime(Date statTime) {
        this.statTime = statTime;
    }
}

2. 持久层代码：

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface MerchantPurchaseStatTimeMapper {
    @Insert("INSERT INTO merchant_purchase_stat_time (stat_time) VALUES (#{statTime})")
    int insert(MerchantPurchaseStatTime merchantPurchaseStatTime);
}

3. 业务层代码：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class MerchantPurchaseStatTimeService {
    @Autowired
    private MerchantPurchaseStatTimeMapper merchantPurchaseStatTimeMapper;

    public void save(MerchantPurchaseStatTime merchantPurchaseStatTime) {
        merchantPurchaseStatTimeMapper.insert(merchantPurchaseStatTime);
    }
}