abstract class DB::Connection
- DB::Connection
- Reference
- Object
Overview
Database driver implementors must subclass Connection.
Represents one active connection to a database.
Users should never instantiate a Connection manually. Use DB#open or Database#connection.
Refer to QueryMethods for documentation about querying the database through this connection.
Note to implementors
The connection must be initialized in #initialize and closed in #do_close.
Override #build_statement method in order to return a prepared Statement to allow querying.
See also Statement to define how the statements are executed.
If at any give moment the connection is lost a DB::ConnectionLost should be raised. This will allow the connection pool to try to reconnect or use another connection if available.
Included Modules
Defined in:
db/connection.crClass Method Summary
Instance Method Summary
Instance methods inherited from module DB::QueryMethods
exec(query, *args)
exec,
query(query, *args)query(query, *args, &block) query, query_all(query, *args, &block : ResultSet -> U) : Array(U)
query_all(query, *args, as types : Tuple)
query_all(query, *args, as type : Class) query_all, query_one(query, *args, &block : ResultSet -> U) : U
query_one(query, *args, as types : Tuple)
query_one(query, *args, as type : Class) query_one, query_one?(query, *args, &block : ResultSet -> U) : U?
query_one?(query, *args, as types : Tuple)
query_one?(query, *args, as type : Class) query_one?, scalar(query, *args) scalar