Sqel easy to use

sping cache

spEL（Spring Expression Language） Cache definition key And all kinds of condition .

spring Cache utilize AOP The agent ends to implement
spring Provides CacheManage , You can configure the redis cache .

annotation	effect	Parameter description
@Cacheable	Configure the method , Cache method results	value: Cache name stay spring Defined in the configuration file key: The cache key , Can be empty or specify SpEL. By default, all parameters of the method are combined condition： Cache conditions , Can be null .SpEL Write back true、fasle ,true Cache when
@CachePut	Method configuration , Cache the results after calling the method	The parameters are the same as @Cacheable equally
@CacheEvict	Method configuration , Delete cache conditionally	Parametric pain @CAcheable equally allEntries: Whether to empty all cache contents , Default fasle beforeInvocation: Whether to clean up the method before it executes , Default fasle （ Method will not be cleared if it is abnormal ）

SpEL Introduce

@Cacheable(value = "users" , key = "#user.userName" , condition = "#user.age < 35")
User getUserList();

name	Location	describe	Example
methodName	root object	Name of the currently called method	#root.methodnaame
method	root object	Currently called method	#root.method.name
target	root object	Currently called target object instance	#root.target
targetClass	root object	The class of the target object being called	#root.targetClass
args	root object	The parameter list of the currently called method	#root.args[0]
caches	root object	The cache list used by the current method call	#root.caches[0].name
Argument	Execution context	The currently called method parameter , method( User u ) adopt #u.name obtain	#u.name
result	Execution context	Method returns a value after execution ( After the method is executed, it is judged to be valid ) @CacheVict (beforeInvocation = false)	#result

// Add cache on interface 
public interface CacheService {
    

    @Cacheable(value = "userList" , key = "methodName")
    List<User> list();

    @Cacheable(value = "user",key = "'user'.concat(#id.toString())")
    User findUserById(Long id);

    // Here only modify  3  Number 
    //@CachePut(value="user",key="'user'.concat(#user.name.toString())")
    @CachePut(value="user",key="'user'.concat(3)")
    User update(User user);

    @CacheEvict(value = "user", key = "'user'.concat(#id.toString())")
    void remove(Long id);
}

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