multiple tries

backend/v3/storage/database/database.go

@@ -0,0 +1,60 @@
+package database
+
+import (
+	"context"
+)
+
+var (
+	db *database
+)
+
+type database struct {
+	connector Connector
+	pool      Pool
+}
+
+type Pool interface {
+	Beginner
+	QueryExecutor
+
+	Acquire(ctx context.Context) (Client, error)
+	Close(ctx context.Context) error
+}
+
+type Client interface {
+	Beginner
+	QueryExecutor
+
+	Release(ctx context.Context) error
+}
+
+type Querier interface {
+	Query(ctx context.Context, stmt string, args ...any) (Rows, error)
+	QueryRow(ctx context.Context, stmt string, args ...any) Row
+}
+
+type Executor interface {
+	Exec(ctx context.Context, stmt string, args ...any) error
+}
+
+type QueryExecutor interface {
+	Querier
+	Executor
+}
+
+type Scanner interface {
+	Scan(dest ...any) error
+}
+
+type Row interface {
+	Scanner
+}
+
+type Rows interface {
+	Row
+	Next() bool
+	Close() error
+	Err() error
+}
+
+type Query[T any] func(querier Querier) (result T, err error)