springboot 自定义Repository-优快云博客

本文链接：https://blog.youkuaiyun.com/HH_KELE/article/details/90004497

本文介绍如何在 SpringBoot 中自定义 Repository 接口及其实现类，并通过示例展示具体的配置方法。

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springboot 自定义Repository

启用 JpaRepositories

package cn.xiaojf;

import cn.xiaojf.today.data.rdb.repository.RdbCommonRepositoryImpl;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.vendor.HibernateJpaSessionFactoryBean;

@SpringBootApplication
@EnableJpaRepositories(repositoryBaseClass = RdbCommonRepositoryImpl.class)
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

自定义 repository 接口

package cn.xiaojf.today.data.rdb.repository;

import cn.xiaojf.today.base.model.PageInfo;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.NoRepositoryBean;
import org.springframework.data.repository.PagingAndSortingRepository;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * 自定义 repository 接口
 * @author xiaojf 2016/12/8 19:31.
 */
@NoRepositoryBean
public interface RdbCommonRepository<T, ID extends Serializable> extends CrudRepository<T, ID> {
   
}

自定义 repository 接口实现类

package cn.xiaojf.today.data.rdb.repository;

import cn.xiaojf.today.base.exception.BusinessException;
import cn.xiaojf.today.base.model.PageInfo;
import cn.xiaojf.today.base.util.BeanToMapUtil;
import cn.xiaojf.today.base.util.CamelCaseUtil;
import cn.xiaojf.today.base.util.SpringBeanUtil;
import cn.xiaojf.today.data.rdb.util.EntityUtil;
import cn.xiaojf.today.data.rdb.util.QueryDynamicLoader;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.transform.Transformers;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.data.jpa.repository.support.JpaEntityInformation;
import org.springframework.data.jpa.repository.support.SimpleJpaRepository;
import org.springframework.util.Assert;

import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.validation.constraints.NotNull;
import java.io.Serializable;
import java.io.StringWriter;
import java.math.BigInteger;
import java.util.*;

/**
 * 自定义关系数据库repository
 * @author xiaojf 2016/12/8 19:35
 */
public class RdbCommonRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T,ID> implements RdbCommonRepository<T,ID> {
    private final EntityManager entityManager;
    private final JpaEntityInformation entityInformation;
    private final Class<T> clazz;

    public RdbCommonRepositoryImpl(JpaEntityInformation<T, ?> entityInformation, EntityManager entityManager) {
        super(entityInformation, entityManager);
        this.entityManager = entityManager;
        this.entityInformation = entityInformation;
        this.clazz = entityInformation.getJavaType();
    }
}

在继承了 RdbCommonRepository 接口后， springboot会自动的在相同目录寻找他的实现类，规则是RdbCommonRepository+Impl 类命名规则，也可以手动指定，此处不做多解释，可以自行百度，一般不需要自行指定，使用方式如下

package cn.xiaojf.today.sys.repository;

import cn.xiaojf.today.data.rdb.repository.RdbCommonRepository;
import cn.xiaojf.today.sys.entity.SysUser;

/**
 * 用户 repository
 * @author xiaojf 2016/12/8 19:46.
 */
public interface SysUserRepository extends RdbCommonRepository<SysUser,String> {
    SysUser findFirstByUsername(String username);
}