change DBConfig.Path to URI and add ConnectionString method

config.go

@@ -1,14 +1,31 @@
 package dbx
 
+import "fmt"
+
 // DBConfig provides a template for database connection configuration compatible
 // with go-toolkit/config. If used as a field in a struct, remember to include
 // the `validate:"dive"` tag to ensure that the validator checks sub-fields.
 type DBConfig struct {
 	User        string `validate:"required"`
 	Password    string `validate:"required"`
-	Path        string `validate:"hostname_port,required"`
+	URI         string `validate:"hostname_port,required"`
 	Name        string `validate:"required"`
 	MaxConn     int    `validate:"min=1,max=1000"`
 	AutoMigrate bool
 	DebugLog    bool
 }
+
+// ConnectionString returns a connection string compatible with the given
+// SQL dialect.
+func (cfg *DBConfig) ConnectionString(dialect Dialect) string {
+	switch dialect {
+	case DialectPostgres:
+		return fmt.Sprintf("postgres://%s:%s@%s/%s?sslmode=disable",
+			cfg.User, cfg.Password, cfg.URI, cfg.Name)
+	case DialectMySQL:
+		return fmt.Sprintf("%s:%s@tcp(%s)/%s?parseTime=true&loc=Local",
+			cfg.User, cfg.Password, cfg.URI, cfg.Name)
+	default:
+		panic("unsupported dialect: " + string(dialect))
+	}
+}