Redis数据库之数据查询与同步

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数据的查询:

先将数据库中的数据存储到Redis中

球队表的数据:

球队表的存储:

球队表的测试代码:

@Test
    public void testqueryRedis() {
        Jedis jedis = new Jedis("192.168.100.132", 6379);
        //查询部门的id集合
        List<String> list = jedis.lrange("team:team_id", 0, -1);
        List<Dept> dList = new ArrayList<Dept>();
        for(String teamId : list){
            //获得team_id
            String tname = jedis.hget("team:"+teamId, "t_name");
            String loc = jedis.hget("team:"+teamId, "loc");
            Dept dept = new Dept();
            dept.setDeptId(new Integer(teamId));
            dept.setDname(tname);
            dept.setLoc(loc);
            dList.add(dept);
        }
        System.out.println(dList);
        jedis.close();
    }

人员表的数据:

人员表的存储:

人员表的测试代码:

@Test
    public void testqueryRedis1() {
        Jedis jedis = new Jedis("192.168.100.132", 6379);
        String empId = jedis.hget("emp:1", "emp_id");
        String name = jedis.hget("emp:1", "ename");
        String gender = jedis.hget("emp:1", "gender");
        String teamId = jedis.hget("emp:1", "team_id");
        Emp emp = new Emp();
        emp.setEmpId(new Integer(empId));
        emp.setEname(name);
        emp.setGender(new Integer(gender));
        //获得部门信息
        String tname = jedis.hget("team:"+teamId, "t_name");
        String loc = jedis.hget("team:"+teamId, "loc");
        Dept dept = new Dept();
        dept.setDeptId(new Integer(teamId));
        dept.setDname(tname);
        dept.setLoc(loc);
        emp.setDept(dept);
        jedis.close();
    }

球队跟员工是一对多的关系, 以上的是从多对一的方向来看的, 下面介绍从一对多的方向来看

@Test
    public void testqueryRedis2() {
        Jedis jedis = new Jedis("192.168.100.132", 6379);
        //获得部门信息
        String tname = jedis.hget("team:1", "t_name");
        String loc = jedis.hget("team:1", "loc");
        Dept dept = new Dept();
        dept.setDeptId(new Integer(1));
        dept.setDname(tname);
        dept.setLoc(loc);
        List<String> list = jedis.lrange("team:1:emp", 0, -1);
        Set<Emp> set = new HashSet<Emp>();
        for(String empId : list){
            String name = jedis.hget("emp:"+empId, "ename");
            String gender = jedis.hget("emp:"+empId, "gender");
            String teamId = jedis.hget("emp:"+empId, "team_id");
            Emp emp = new Emp();
            emp.setEmpId(new Integer(empId));
            emp.setEname(name);
            emp.setGender(new Integer(gender));
            set.add(emp);
        }
        dept.setEmpSet(set);
        jedis.close();
    }

数据的同步:

关系型数据库中的数据:

同步代码:

@Test
	public void importRedis(){
		SessionFactory factory = HiberUtils.getSessionFactory();
		Session session = factory.openSession();
		Jedis jedis = new Jedis("192.168.100.132", 6379);
		try {
			//查询时不但会查询出自己的数据，还会查询出关联的数据
			Dept dept = (Dept) session.get(Dept.class, 1);
			//dept:dept_id
			jedis.hset("dept:"+dept.getDeptId(), "dept_id", dept.getDeptId()+"");
			jedis.hset("dept:"+dept.getDeptId(), "dname", dept.getDname()+"");
			jedis.hset("dept:"+dept.getDeptId(), "loc", dept.getLoc()+"");
			
			Set<Emp> empSet = dept.getEmpSet();
			for(Emp emp : empSet){
				jedis.hset("emp:"+emp.getEmpId(), "emp_id", emp.getEmpId()+"");
				jedis.hset("emp:"+emp.getEmpId(), "ename", emp.getEname()+"");
				jedis.hset("emp:"+emp.getEmpId(), "gender", emp.getGender()+"");
				jedis.hset("emp:"+emp.getEmpId(), "birthday", new SimpleDateFormat("yyyy-MM-dd").format(emp.getBirthday())+"");
				jedis.hset("emp:"+emp.getEmpId(), "dept_id", emp.getDept().getDeptId()+"");
				jedis.lpush("dept:"+dept.getDeptId()+":emp", emp.getEmpId()+"");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			session.close();
		}
	}