• Redis实战之征服 Redis + Jedis + Spring (二)


    不得不说,用哈希操作来存对象,有点自讨苦吃!

    不过,既然吃了苦,也做个记录,也许以后API升级后,能好用些呢?!

    或许,是我的理解不对,没有真正的理解哈希表。

    相关链接:

    Redis实战

    Redis实战之Redis + Jedis

    Redis实战之征服 Redis + Jedis + Spring (一)

    Redis实战之征服 Redis + Jedis + Spring (二)

    Redis实战之征服 Redis + Jedis + Spring (三)

    一、预期

    接上一篇,扩充User属性:

     

    Java代码  
    1. public class User implements Serializable {  
    2.     private static final long serialVersionUID = -1267719235225203410L;  
    3.   
    4.     private String uid;  
    5.   
    6.     private String address;  
    7.   
    8.     private String mobile;  
    9.   
    10.     private String postCode;  
    11. }  
    public class User implements Serializable {
    	private static final long serialVersionUID = -1267719235225203410L;
    
    	private String uid;
    
    	private String address;
    
    	private String mobile;
    
    	private String postCode;
    }

     我期望的是: 

     

    redis 127.0.0.1:6379> hmget uc.user.info.uid.u123456 address mobile postCode
    1) "xe4xb8x8axe6xb5xb7"
    2) "13800138000"
    3) "100859"

     

    几乎就是一个对象了! 

    但是,接下来的代码实现,让我彻底崩溃了!

     

    二、代码实现

    1.保存——HMSET

     

    Java代码  
    1. @Override  
    2. public void save(final User user) {  
    3.     redisTemplate.execute(new RedisCallback<Object>() {  
    4.         @Override  
    5.         public Object doInRedis(RedisConnection connection)  
    6.                 throws DataAccessException {  
    7.             byte[] key = redisTemplate.getStringSerializer().serialize(  
    8.                     "uc.user.info.uid." + user.getUid());  
    9.             BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate  
    10.                     .boundHashOps(key);  
    11.             boundHashOperations.put(redisTemplate.getStringSerializer()  
    12.                     .serialize("mobile"), redisTemplate  
    13.                     .getStringSerializer().serialize(user.getMobile()));  
    14.             boundHashOperations.put(redisTemplate.getStringSerializer()  
    15.                     .serialize("address"), redisTemplate  
    16.                     .getStringSerializer().serialize(user.getAddress()));  
    17.             boundHashOperations.put(redisTemplate.getStringSerializer()  
    18.                     .serialize("postCode"), redisTemplate  
    19.                     .getStringSerializer().serialize(user.getPostCode()));  
    20.             connection.hMSet(key, boundHashOperations.entries());  
    21.             return null;  
    22.         }  
    23.     });  
    24. }  
    	@Override
    	public void save(final User user) {
    		redisTemplate.execute(new RedisCallback<Object>() {
    			@Override
    			public Object doInRedis(RedisConnection connection)
    					throws DataAccessException {
    				byte[] key = redisTemplate.getStringSerializer().serialize(
    						"uc.user.info.uid." + user.getUid());
    				BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate
    						.boundHashOps(key);
    				boundHashOperations.put(redisTemplate.getStringSerializer()
    						.serialize("mobile"), redisTemplate
    						.getStringSerializer().serialize(user.getMobile()));
    				boundHashOperations.put(redisTemplate.getStringSerializer()
    						.serialize("address"), redisTemplate
    						.getStringSerializer().serialize(user.getAddress()));
    				boundHashOperations.put(redisTemplate.getStringSerializer()
    						.serialize("postCode"), redisTemplate
    						.getStringSerializer().serialize(user.getPostCode()));
    				connection.hMSet(key, boundHashOperations.entries());
    				return null;
    			}
    		});
    	}
    

    这里用到:

     

    Java代码  
    1. BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate.boundHashOps(key);  
    2. boundHashOperations.put(redisTemplate.getStringSerializer().serialize("mobile"), redisTemplate.getStringSerializer().serialize(user.getMobile()));  
    BoundHashOperations<Serializable, byte[], byte[]> boundHashOperations = redisTemplate.boundHashOps(key);
    boundHashOperations.put(redisTemplate.getStringSerializer().serialize("mobile"), redisTemplate.getStringSerializer().serialize(user.getMobile()));

     看着就有点肿。。。Map封装完以后,用HMSET命令:

     

    Java代码  
    1. connection.hMSet(key, boundHashOperations.entries());  
    connection.hMSet(key, boundHashOperations.entries());

     这时候就完成了哈希表的保存操作,可以在控制台看到相应的数据了。

     

    redis 127.0.0.1:6379> hmget uc.user.info.uid.u123456 address mobile postCode
    1) "xe4xb8x8axe6xb5xb7"
    2) "13800138000"
    3) "100859"

     

    2.获取——HMGET

    这一刻,我彻底崩溃了!取出来的值是个List,还得根据取得顺序,逐个反序列化,得到内容。

     

    Java代码  
    1. @Override  
    2. public User read(final String uid) {  
    3.     return redisTemplate.execute(new RedisCallback<User>() {  
    4.         @Override  
    5.         public User doInRedis(RedisConnection connection)  
    6.                 throws DataAccessException {  
    7.             byte[] key = redisTemplate.getStringSerializer().serialize(  
    8.                     "uc.user.info.uid." + uid);  
    9.             if (connection.exists(key)) {  
    10.                 List<byte[]> value = connection.hMGet(  
    11.                         key,  
    12.                         redisTemplate.getStringSerializer().serialize(  
    13.                                 "address"),  
    14.                         redisTemplate.getStringSerializer().serialize(  
    15.                                 "mobile"), redisTemplate  
    16.                                 .getStringSerializer()  
    17.                                 .serialize("postCode"));  
    18.                 User user = new User();  
    19.                 String address = redisTemplate.getStringSerializer()  
    20.                         .deserialize(value.get(0));  
    21.                 user.setAddress(address);  
    22.                 String mobile = redisTemplate.getStringSerializer()  
    23.                         .deserialize(value.get(1));  
    24.                 user.setMobile(mobile);  
    25.                 String postCode = redisTemplate.getStringSerializer()  
    26.                         .deserialize(value.get(2));  
    27.                 user.setPostCode(postCode);  
    28.                 user.setUid(uid);  
    29.   
    30.                 return user;  
    31.             }  
    32.             return null;  
    33.         }  
    34.     });  
    35. }  
    	@Override
    	public User read(final String uid) {
    		return redisTemplate.execute(new RedisCallback<User>() {
    			@Override
    			public User doInRedis(RedisConnection connection)
    					throws DataAccessException {
    				byte[] key = redisTemplate.getStringSerializer().serialize(
    						"uc.user.info.uid." + uid);
    				if (connection.exists(key)) {
    					List<byte[]> value = connection.hMGet(
    							key,
    							redisTemplate.getStringSerializer().serialize(
    									"address"),
    							redisTemplate.getStringSerializer().serialize(
    									"mobile"), redisTemplate
    									.getStringSerializer()
    									.serialize("postCode"));
    					User user = new User();
    					String address = redisTemplate.getStringSerializer()
    							.deserialize(value.get(0));
    					user.setAddress(address);
    					String mobile = redisTemplate.getStringSerializer()
    							.deserialize(value.get(1));
    					user.setMobile(mobile);
    					String postCode = redisTemplate.getStringSerializer()
    							.deserialize(value.get(2));
    					user.setPostCode(postCode);
    					user.setUid(uid);
    
    					return user;
    				}
    				return null;
    			}
    		});
    	}
    

     这个实现,跟Redis的命令几乎一模一样,指定Key,指定field,获取其值。

     

    Java代码  
    1. List<byte[]> value = connection.hMGet(key,redisTemplate.getStringSerializer().serialize("address"),  
    2. redisTemplate.getStringSerializer().serialize("mobile"),   
    3. redisTemplate.getStringSerializer().serialize("postCode"));  
    List<byte[]> value = connection.hMGet(key,redisTemplate.getStringSerializer().serialize("address"),
    redisTemplate.getStringSerializer().serialize("mobile"), 
    redisTemplate.getStringSerializer().serialize("postCode"));
    

     我绝对相信,要么是我用的过于肤浅,低估了Spring的封装能力。或者,我该直接Json!等等,这不是MongoDB干的事情吗?!

    PS:这两篇博客里操作的数据类型,只能是String类型,还没搞定除此以外任何类型。吾将上下而求索~~~

    上述操作也许你吐了,接下来的代码,就再吐一次吧!

    封装对象的时候,一定要记得次序。。。。这绝对不是一个优质代码的实现风格!

     

    Java代码  
    1. User user = new User();  
    2. String address = redisTemplate.getStringSerializer().deserialize(value.get(0));  
    3. user.setAddress(address);  
    4. String mobile = redisTemplate.getStringSerializer().deserialize(value.get(1));  
    5. user.setMobile(mobile);  
    6. String postCode = redisTemplate.getStringSerializer().deserialize(value.get(2));  
    7. user.setPostCode(postCode);  
    User user = new User();
    String address = redisTemplate.getStringSerializer().deserialize(value.get(0));
    user.setAddress(address);
    String mobile = redisTemplate.getStringSerializer().deserialize(value.get(1));
    user.setMobile(mobile);
    String postCode = redisTemplate.getStringSerializer().deserialize(value.get(2));
    user.setPostCode(postCode);

     好吧!苦逼的事情,就此结束。目标Json支持!

    相关链接:

    Redis实战

    Redis实战之Redis + Jedis

    Redis实战之征服 Redis + Jedis + Spring (一)

    Redis实战之征服 Redis + Jedis + Spring (二)

    Redis实战之征服 Redis + Jedis + Spring (三)

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  • 原文地址:https://www.cnblogs.com/javawebsoa/p/3235519.html
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