What is this?

A minimal extension of Laravel default behaviour to minimize interactions after connection towards a MySql Server. Compatible with Laravel 5.7+, 6.x and 7.x .

Why?

• set names ... statement affects only the server, causing possible differences on operations that involve charsets, especially while enabling prepared statement emulation.
  Setting connection charset via PDO DSN, instead, affect both client and server.
• Declaring the connection database into PDO DSN, allow to automatically select the db, without execute more statements.
  Also, some Connections Proxies do not allow execution of use ${dbname} statement.
• set names ... statement could be necessary if you need to specify a collation different from the server default for the specified charset. If you can stick with the default (ie. for utf8mb4, is utf8mb4_general_ci on MySQL 5.7 and utf8mb4_0900_ai_ci on MySQL 8.0), you should unset database.connections.mysql.collation.
• Such configuration statements, can cause connection pinning on Proxies.
• When using Cluster with read-only Replicas, any script execution that also writes to the DB, handles 2 connections. If using stickiness, the read-only handle is unused and unnecessary occupying a MySQL thread.

MySQL general log output with default driver and config:

2020-07-24T12:55:15.580117Z	    3 Connect	db_user@127.0.0.1 on db_schema using TCP/IP
2020-07-24T12:55:15.581060Z	    3 Query	use `db_schema`
2020-07-24T12:55:15.582896Z	    3 Prepare	set names 'utf8mb4'
2020-07-24T12:55:15.583003Z	    3 Execute	set names 'utf8mb4'
2020-07-24T12:55:15.583159Z	    3 Close stmt	
2020-07-24T12:55:15.583256Z	    3 Prepare	set session sql_mode='NO_ENGINE_SUBSTITUTION'
2020-07-24T12:55:15.583331Z	    3 Execute	set session sql_mode='NO_ENGINE_SUBSTITUTION'
2020-07-24T12:55:15.583448Z	    3 Close stmt	
2020-07-24T12:55:15.583531Z	    3 Query	select true

MySQL general log output with micro driver:

2020-07-24T12:51:18.507740Z	    2 Connect	db_user@127.0.0.1 on db_schema using TCP/IP
2020-07-24T12:51:18.509693Z	    2 Query	select true

This result can be obtained with all database.connections.mysql.collation, database.connections.mysql.strict and database.connections.mysql.timezone set to NULL.

What are the differences?

• Set charset into PDO DSN.
• Do not execute the use ${dbname} statement, read from PDO DSN.
• Do not execute set names ... unless you provide an explicit database.connections.mysql.collation.
• When using Cluster with read-only Replicas, and database.connections.mysql.sticky is true, close immediately the read-only connection after the switch to the read-write instance.

How to use

• Run composer require coppolafab/micro-laravel-mysql-driver
• Add database config options to the mysql section:

  'microOverrideDriver' => env('DB_MICROMYSQL_OVERRIDE_DRIVER', false),
  'microCloseReadConnectionAfterWrite' => env('DB_MICROMYSQL_CLOSE_READ_CONNECTION_AFTER_WRITE', false),
  

• Enable new config options via .env file:

  DB_MICROMYSQL_OVERRIDE_DRIVER=true
  DB_MICROMYSQL_CLOSE_READ_CONNECTION_AFTER_WRITE=true