015-go Database Operational considerations

1. Query, Exec
(1) Exec (update, INSERT, delete, etc. no result set returned operation) will automatically release the connection after the call is finished;
(2) Query (return to SQL.) Rows) does not release the connection, and still holds the connection after it has been called, transferring ownership of the connection to SQL. Rows, so you need to manually call close to return the connection.

2, SQL. Open () is to take out the corresponding DB, when the database has not yet established a connection, just initialized a SQL. DB structure. Open when the database connection is not established, only when the use of the actual connection will be established.

015-go Database Operational considerations