Preface

MongoDB mass data query is fast without data model 
   Suitable for log database
   Or the intermediate database reads and stores some business data to be read from the MySQL database 
 MongoDB is not suitable for multi table transaction function, and there is not a good determination mechanism for write operation. It is not suitable for being a database of business data

Reading and writing business data transactions stored in MySQl 

Implementation process

Configure database

<?php

return [
    // Database type
    'type'            => '\think\mongo\Connection',
    // server address
    'hostname'        => 'localhost',
    // Database name
    'database'        => 'tuzi',
    // user name
    'username'        => '',
    // Password
    'password'        => '',
    // port
    'hostport'        => '27017',
    // Connect dsn
    'dsn'             => '',
    // Database connection parameters
    'params'          => [],
    // utf8 is used by default for database coding
    'charset'         => 'utf8',
    // Database table prefix
    'prefix'          => '',
];

Configure config

'mysql_db'  => [
        // Database type
        'type'            => 'mysql',
        // server address
        'hostname'        => 'localhost',
        // Database name
        'database'        => 'tuzi',
        // user name
        'username'        => 'root',
        // Password
        'password'        => '111',
        // port
        'hostport'        => '',
        // Connect dsn
        'dsn'             => '',
        // Database connection parameters
        'params'          => [],
        // utf8 is adopted by default for database coding
        'charset'         => 'utf8',
        // Database table prefix
        'prefix'          => '',
        // Database debugging mode
        'debug'           => true,
        // Database deployment mode: 0 centralized (single server), 1 distributed (master-slave server)
        'deploy'          => 0,
        // Whether the master-slave mode of database read-write separation is effective
        'rw_separate'     => false,
        // Number of primary servers after read-write separation
        'master_num'      => 1,
        // Specify the serial number of the slave server
        'slave_no'        => '',
        // Strictly check whether the field exists
        'fields_strict'   => true,
        // Dataset return type
        'resultset_type'  => 'array',
        // Auto write timestamp field
        'auto_timestamp'  => false,
        // Default time format after time field extraction
        'datetime_format' => 'Y-m-d H:i:s',
        // Whether SQL performance analysis is required
        'sql_explain'     => false,
    ]

code implementation

<?php
namespace app\index\controller;
use think\Db;
class Index
{
    public function index()
    {
        echo "--------I passed mongodb Queried data----------<br/>";
        $data = array('a'=>'Element 1','b'=>'Element 2');
        // Db::table('document')->insert($data);
        $res = Db::table('document')->select();
        dump($res);
        echo "--------I passed mysql Queried data----------<br/>";
        $res1 = Db::connect(Config('mysql_db'))->table('admin')->select();
        dump($res1);
        return "Completed successfully";
    }
}

Operation results

--------I passed mongodb Queried data----------
array(3) {
  [0] => array(3) {
    ["_id"] => object(MongoDB\BSON\ObjectId)#12 (1) {
      ["oid"] => string(24) "5a51bf6583869e4b62321af3"
    }
    ["a"] => string(7) "Element 1"
    ["b"] => string(7) "Element 2"
  }
  [1] => array(3) {
    ["_id"] => object(MongoDB\BSON\ObjectId)#13 (1) {
      ["oid"] => string(24) "5a51bfa083869e4b647a61c6"
    }
    ["a"] => string(7) "Element 1"
    ["b"] => string(7) "Element 2"
  }
  [2] => array(3) {
    ["_id"] => object(MongoDB\BSON\ObjectId)#14 (1) {
      ["oid"] => string(24) "5a51c30383869e4b674156f6"
    }
    ["a"] => string(7) "Element 1"
    ["b"] => string(7) "Element 2"
  }
}
--------I passed mysql Queried data----------
array(1) {
  [0] => array(3) {
    ["admin_id"] => int(1)
    ["user_name"] => string(5) "admin"
    ["password"] => string(3) "888"
  }
}
//Completed successfully 0.030056s ShowPageTrace