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This article focuses on "weed3-2.3.3. What is the cache control of the query?" interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "weed3-2.3.3. What is the cache control of the query?"

Weed3 a mini ORM framework (only 0.1Mb)

Source code: https://github.com/noear/weed3 source code: https://gitee.com/noear/weed3

Cache control is the focus of query.

The framework provides control services. It is important to understand that it is not the caching service itself.

Cache control requires two important interface definitions:

1. Cache service adaptation interface ICacheService (its enhanced version of ICacheServiceEx is commonly used)

/ / it can be used to wrap various cache services public interface ICacheService {void store (String key, Object obj, int seconds); Object get (String key); void remove (String key); int getDefalutSeconds (); String getCacheKeyHead ();} / * * weed3 has three built-in implementation classes: * EmptyCache, empty cache * LocalCache, local cache * SecondCache, second-level cache container (can put two ICacheService together into a second-level cache service A little more nesting is a three-level cache service) * /

two。 Interface for manipulation on caching service: ICacheController

Public interface ICacheController {/ / which cache service T caching (ICacheService service) to use; / / whether to use cache T usingCache (boolean isCache); / / use cache and set time T usingCache (int seconds); / / tag T cacheTag (String tag) to cache;} with the above foundation, start using cache control now.

1. Let's get a service example first.

ICacheService cache = new LocalCache ()

two。 Use it.

With caching, the time is the default (a stable cache key is automatically generated)

Db.table ("test") .select ("*") .caching (cache) .getMapList ()

Use caching and cache for 30s

Db.table ("test") .caching (cache) .usingCache (30) / can also be placed between table () and select () .select ("*"). GetMapList ()

Add a tag to the cache (tag is equivalent to a virtual folder for caching key)

Db.table ("test") .caching (cache) .usingCache (30). CacheTag ('test_all') / / this is tag, not key .limit (10pm 20) .select ("*"). GetMapList ()

, 3. Fine control

Control the cache time according to the query results

Db.table ("test") .where ("id=?", 10) .caching (cache) .select ("*") .getItem (UserModel.class, (cu,m)-> {if (m.hot > 2) {uc.usingCache (60 * 5); / / popular user cache 5 minutes} else {uc.usingCache (30);}})

4. Cache cleanup

Take a paged query as an example

Db.table ("test") .limit (20Magne10) .caching (cache) .cacheTag ("test_all") .select ("*"). GetMapList (); db.table ("test"). Limit (30pm 10) .caching (cache) .cacheTag ("test_all") .select ("*") .getMapList (); / / No matter how many pages you have, a tag clears it cache.clear ("test_all")

5. Cache update

This is rarely used (cache that requires individual updates, redis is recommended)

Db.table ("test") .where ("id=?", 10) .caching (cache) .cacheTag ("test_" + 10) .select ("*") .getItem (UserModel.class); cache.update ("test_" + 10, (UserModel m)-> {m.sex = 10; return m;})

The cache control of the framework is also extremely free. It should be, isn't it? Ha ha.

Availability of caching services

1. Built-in caching service

Org.noear.weed.cache.EmptyCache / / empty cache

Org.noear.weed.cache.LocalCache / / lightweight local cache (based on Map implementation)

Org.noear.weed.cache.SecondCache / / second-level cache (assemble two ICacheServiceEx implementations)

two。 Extended caching service

Org.noear.weed.cache.ehcache.EhCache / / based on ehcache encapsulation

Org.noear weed3.cache.ehcache 3.2.1.1

Org.noear.weed.cache.j2cache.J2Cache / / based on J2Cache package developed by Chinese people

Org.noear weed3.cache.j2cache 3.2.1.1

Org.noear.weed.cache.memcached.MemCache / / based on memcached encapsulation

Org.noear weed3.cache.memcached 3.2.1.1

Org.noear.weed.cache.redis.RedisCache / / based on redis encapsulation

Org.noear weed3.cache.redis 3.2.1.1

You can also package your own ICacheServiceEx.

Do you want to package it yourself?

At this point, I believe you have a deeper understanding of "weed3-2.3.3. What is the cache control of the query?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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