- Configuration
- Cache Usage
- Cache Tags
- Atomic Locks
- Adding Custom Cache Drivers
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Introduction
Some of the data retrieval or processing tasks performed by your application could be CPU intensive or take several seconds to complete. When this is the case, it is common to cache the retrieved data for a time so it can be retrieved quickly on subsequent requests for the same data. The cached data is usually stored in a very fast data store such as Memcached or Redis.
Hi people, I'm having a problem with the sqlsrv driver, i use Ubuntu16.04 and i've been searching about that but i couldn't find an answer. Interestingly, our application could not handle any of the edge cases we conceived - even though we initially had 100% code coverage. Update Application to Pass Tests. Before updating the code, let’s see what’s going on. Start your server and either using your browser or Postman, navigate to http: / / localhost: 8000 / api / user / 0.
Thankfully, Laravel provides an expressive, unified API for various cache backends, allowing you to take advantage of their blazing fast data retrieval and speed up your web application.
Configuration
The level’s not the only factor that determines if Laravel will eventually write a specific message to the channel. The channel as a destination is another factor as well. Bear in mind when you use the Log facade to write log messages, Laravel will send these to the default channel stated in your config/logging.php. Contact your hosting provider & install extension for pdomysql. Hopefully it will work. Before contacting with them check your current configuration using phpinfo , you will not find that driver. All Languages SQL could not find driver (SQL: select. from informationschema.tables where tableschema = laravel and tablename = migrations and tabletype = 'BASE TABLE').
Your application's cache configuration file is located at
config/cache.php
. In this file, you may specify which cache driver you would like to be used by default throughout your application. Laravel supports popular caching backends like Memcached, Redis, DynamoDB, and relational databases out of the box. In addition, a file based cache driver is available, while array
and 'null' cache drivers provide convenient cache backends for your automated tests.The cache configuration file also contains various other options, which are documented within the file, so make sure to read over these options. By default, Laravel is configured to use the
file
cache driver, which stores the serialized, cached objects on the server's filesystem. For larger applications, it is recommended that you use a more robust driver such as Memcached or Redis. You may even configure multiple cache configurations for the same driver.Driver Prerequisites
Database
When using the
database
cache driver, you will need to setup a table to contain the cache items. You'll find an example Schema
declaration for the table below:{tip} You may also use the
php artisan cache:table
Artisan command to generate a migration with the proper schema.Memcached
Using the Memcached driver requires the Memcached PECL package to be installed. You may list all of your Memcached servers in the
config/cache.php
configuration file. This file already contains a memcached.servers
entry to get you started:If needed, you may set the
host
option to a UNIX socket path. If you do this, the port
option should be set to 0
:Redis
Farming simulator 2029. Before using a Redis cache with Laravel, you will need to either install the PhpRedis PHP extension via PECL or install the
predis/predis
package (~1.0) via Composer. Laravel Sail already includes this extension. In addition, official Laravel deployment platforms such as Laravel Forge and Laravel Vapor have the PhpRedis extension installed by default.For more information on configuring Redis, consult its Laravel documentation page.
DynamoDB
Before using the DynamoDB cache driver, you must create a DynamoDB table to store all of the cached data. Typically, this table should be named
cache
. However, you should name the table based on the value of the stores.dynamodb.table
configuration value within your application's cache
configuration file.This table should also have a string partition key with a name that corresponds to the value of the
stores.dynamodb.key
configuration item within your application's cache
configuration file. By default, the partition key should be named key
.Cache Usage
Obtaining A Cache Instance
To obtain a cache store instance, you may use the
Cache
facade, which is what we will use throughout this documentation. The Cache
facade provides convenient, terse access to the underlying implementations of the Laravel cache contracts:Accessing Multiple Cache Stores
Using the
Cache
facade, you may access various cache stores via the store
method. The key passed to the store
method should correspond to one of the stores listed in the stores
configuration array in your cache
configuration file:Retrieving Items From The Cache
The
Cache
facade's get
method is used to retrieve items from the cache. If the item does not exist in the cache, null
will be returned. If you wish, you may pass a second argument to the get
method specifying the default value you wish to be returned if the item doesn't exist:You may even pass a closure as the default value. The result of the closure will be returned if the specified item does not exist in the cache. Passing a closure allows you to defer the retrieval of default values from a database or other external service:
Checking For Item Existence
The
has
method may be used to determine if an item exists in the cache. This method will also return false
if the item exists but its value is null
:Incrementing / Decrementing Values
The
increment
and decrement
methods may be used to adjust the value of integer items in the cache. Both of these methods accept an optional second argument indicating the amount by which to increment or decrement the item's value:Retrieve & Store
Sometimes you may wish to retrieve an item from the cache, but also store a default value if the requested item doesn't exist. For example, you may wish to retrieve all users from the cache or, if they don't exist, retrieve them from the database and add them to the cache. You may do this using the
Cache::remember
method:If the item does not exist in the cache, the closure passed to the
remember
method will be executed and its result will be placed in the cache.You may use the
rememberForever
method to retrieve an item from the cache or store it forever if it does not exist:Retrieve & Delete
If you need to retrieve an item from the cache and then delete the item, you may use the
pull
method. Like the get
method, null
will be returned if the item does not exist in the cache:![Could Not Find Driver Laravel Could Not Find Driver Laravel](/uploads/1/3/7/4/137402788/891551088.jpg)
Storing Items In The Cache
You may use the
put
method on the Cache
facade to store items in the cache:If the storage time is not passed to the
put
method, the item will be stored indefinitely:Instead of passing the number of seconds as an integer, you may also pass a
DateTime
instance representing the desired expiration time of the cached item:Store If Not Present
The
add
method will only add the item to the cache if it does not already exist in the cache store. The method will return true
if the item is actually added to the cache. Otherwise, the method will return false
. The add
method is an atomic operation:Storing Items Forever
The
forever
method may be used to store an item in the cache permanently. Since these items will not expire, they must be manually removed from the cache using the forget
method:{tip} If you are using the Memcached driver, items that are stored 'forever' may be removed when the cache reaches its size limit.
Removing Items From The Cache
You may remove items from the cache using the
forget
method:You may also remove items by providing a zero or negative number of expiration seconds:
You may clear the entire cache using the
flush
method:{note} Flushing the cache does not respect your configured cache 'prefix' and will remove all entries from the cache. Consider this carefully when clearing a cache which is shared by other applications.
The Cache Helper
In addition to using the
Cache
facade, you may also use the global cache
function to retrieve and store data via the cache. When the cache
function is called with a single, string argument, it will return the value of the given key:If you provide an array of key / value pairs and an expiration time to the function, it will store values in the cache for the specified duration:
When the
cache
function is called without any arguments, it returns an instance of the IlluminateContractsCacheFactory
implementation, allowing you to call other caching methods:{tip} When testing call to the global
cache
function, you may use the Cache::shouldReceive
method just as if you were testing the facade.Cache Tags
{note} Cache tags are not supported when using the
file
, dynamodb
, or database
cache drivers. Furthermore, when using multiple tags with caches that are stored 'forever', performance will be best with a driver such as memcached
, which automatically purges stale records.Storing Tagged Cache Items
Cache tags allow you to tag related items in the cache and then flush all cached values that have been assigned a given tag. You may access a tagged cache by passing in an ordered array of tag names. For example, let's access a tagged cache and
put
a value into the cache:Accessing Tagged Cache Items
To retrieve a tagged cache item, pass the same ordered list of tags to the
tags
method and then call the get
method with the key you wish to retrieve:Removing Tagged Cache Items
You may flush all items that are assigned a tag or list of tags. For example, this statement would remove all caches tagged with either
people
, authors
, or both. So, both Anne
and John
would be removed from the cache:In contrast, this statement would remove only cached values tagged with
authors
, so Anne
would be removed, but not John
:Atomic Locks
{note} To utilize this feature, your application must be using the
memcached
, redis
, dynamodb
, database
, file
, or array
cache driver as your application's default cache driver. In addition, all servers must be communicating with the same central cache server.Driver Prerequisites
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Database
When using the
database
Phps. cache driver, you will need to setup a table to contain your application's cache locks. You'll find an example Schema
declaration for the table below:Managing Locks
Atomic locks allow for the manipulation of distributed locks without worrying about race conditions. For example, Laravel Forge uses atomic locks to ensure that only one remote task is being executed on a server at a time. You may create and manage locks using the
Cache::lock
method:The
get
method also accepts a closure. After the closure is executed, Laravel will automatically release the lock:If the lock is not available at the moment you request it, you may instruct Laravel to wait for a specified number of seconds. If the lock can not be acquired within the specified time limit, an
IlluminateContractsCacheLockTimeoutException
will be thrown:The example above may be simplified by passing a closure to the
block
method. When a closure is passed to this method, Laravel will attempt to acquire the lock for the specified number of seconds and will automatically release the lock once the closure has been executed:Managing Locks Across Processes
Sometimes, you may wish to acquire a lock in one process and release it in another process. For example, you may acquire a lock during a web request and wish to release the lock at the end of a queued job that is triggered by that request. In this scenario, you should pass the lock's scoped 'owner token' to the queued job so that the job can re-instantiate the lock using the given token.
In the example below, we will dispatch a queued job if a lock is successfully acquired. In addition, we will pass the lock's owner token to the queued job via the lock's
owner
method:Within our application's
ProcessPodcast
job, we can restore and release the lock using the owner token:If you would like to release a lock without respecting its current owner, you may use the
forceRelease
method:Laravel Could Not Find Driver Sqlsrv
Adding Custom Cache Drivers
Writing The Driver
To create our custom cache driver, we first need to implement the
IlluminateContractsCacheStore
contract. So, a MongoDB cache implementation might look something like this:We just need to implement each of these methods using a MongoDB connection. For an example of how to implement each of these methods, take a look at the
IlluminateCacheMemcachedStore
in the Laravel framework source code. Once our implementation is complete, we can finish our custom driver registration by calling the Cache
facade's extend
method:{tip} If you're wondering where to put your custom cache driver code, you could create an
Extensions
namespace within your app
directory. However, keep in mind that Laravel does not have a rigid application structure and you are free to organize your application according to your preferences.Registering The Driver
To register the custom cache driver with Laravel, we will use the
extend
method on the Cache
facade. Since other service providers may attempt to read cached values within their boot
method, we will register our custom driver within a booting
callback. By using the booting
callback, we can ensure that the custom driver is registered just before the boot
method is called on our application's service providers but after the register
method is called on all of the service providers. We will register our booting
callback within the register
method of our application's AppProvidersAppServiceProvider
class:The first argument passed to the
extend
method is the name of the driver. This will correspond to your driver
option in the config/cache.php
configuration file. The second argument is a closure that should return an IlluminateCacheRepository
instance. The closure will be passed an $app
instance, which is an instance of the service container.Once your extension is registered, update your
config/cache.php
configuration file's driver
option to the name of your extension.Events
To execute code on every cache operation, you may listen for the events fired by the cache. Typically, you should place these event listeners within your application's
AppProvidersEventServiceProvider
class: