first commit

connection_factory.go

@@ -0,0 +1,45 @@
+package db
+
+import (
+	"errors"
+	"fmt"
+)
+
+const (
+	DriverMysql   = "mysql"
+	DriverSqlite3 = "sqlite3"
+)
+
+type ConnectionFactory struct {
+}
+
+type Connector interface {
+	connect(config *DBConfig) *Connection
+}
+
+func (f ConnectionFactory) Make(config *DBConfig) *Connection {
+	return f.MakeConnection(config)
+}
+
+func (f ConnectionFactory) MakeConnection(config *DBConfig) *Connection {
+	return f.CreateConnection(config)
+}
+
+func (f ConnectionFactory) CreateConnection(config *DBConfig) *Connection {
+	switch config.Driver {
+	case DriverMysql:
+		connector := MysqlConnector{}
+		conn := connector.connect(config)
+		return conn
+	case DriverSqlite3:
+		connector := SqliteConnector{}
+		conn := connector.connect(config)
+		return conn
+	case "":
+		panic(errors.New("a driver must be specified"))
+	default:
+		panic(errors.New(fmt.Sprintf("unsupported driver:%s", config.Driver)))
+	}
+
+	return nil
+}