pdo's mysql database operation class

The dbconfig class is responsible for configuring database access information, including: server address, port, database instance name, user name, user password, character set, etc.

The dbtemplate class collects access operations to the database, mainly including the following operations:

1. queryrows: returns multiple rows of records

2. queryrow: returns a single record

3. queryforint: Query a single field and return an integer

4. queryforfloat: Query a single field and return a floating point number (float)

5. queryfordouble: Query a single field and return a floating point number (double)

6. queryforobject: Query a single field and return the object. The actual type is determined by the database.

7. update: execute an update statement. insert / upadate / delete

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