pdo database operation class

1. Parameter Description
2. int $debug Whether to enable debugging, if enabled, the sql statement will be output
3. int $mode 0 Return array
4. 1 Return a single record
5. 2 Return the number of rows
6. string $table database table
7. string $fields The database fields that need to be queried. It is allowed to be empty. The default is to find all
8. string $sqlwhere Query conditions, empty is allowed
9. string $orderby Sorting, allowed to be empty, defaults to id reverse order

Another piece of code is based on the transaction instance of my database operation class. Note that the database operation table type must be InnoDB, and other types do not support transactions.

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