MemoryTable

$key = 'a'; // 主键
$value = [
    'name'      =>  'abc',
    'quantity'  =>  123,
];
MemoryTableManager::set($tableName, $key, $value);

读取

// 获取一行
$field = 'quantity';
$value = MemoryTableManager::get($tableName, $key, $field);

数据行是否存在

MemoryTableManager::exist($tableName, $key);

MemoryTableManager::incr($tableName, $key, $field); // +1
MemoryTableManager::incr($tableName, $key, $field, 123); // +123

原子自减

加锁执行

MemoryTableManager::lock($tableName, function(){
    // 方法体内部都在锁中执行，执行完自动释放锁
    $row = MemoryTableManager::get($tableName, $key);
    $row['quantity'] = 456;
});