add ctx/db to all query types

select.go

@@ -1,12 +1,17 @@
 package sqimple
 
 import (
+	"context"
+	"database/sql"
 	"fmt"
 	"strings"
 )
 
 // https://www.sqlite.org/lang_select.html
 type SelectQuery struct {
+	Ctx context.Context
+	DB  *sql.DB
+
 	distinct bool
 
 	columns []Column
@@ -106,6 +111,30 @@ func (q *SelectQuery) OrderBy(defs ...string) *SelectQuery {
 	return q
 }
 
+func (q *SelectQuery) Query() (*sql.Rows, error) {
+	if q.DB != nil {
+		if q.Ctx != nil {
+			return q.DB.QueryContext(q.Ctx, q.String(), q.Args()...)
+		}
+
+		return q.DB.Query(q.String(), q.Args()...)
+	}
+
+	return nil, ErrNoDatabase
+}
+
+func (q *SelectQuery) QueryRow() *sql.Row {
+	if q.DB != nil {
+		if q.Ctx != nil {
+			return q.DB.QueryRowContext(q.Ctx, q.String(), q.Args()...)
+		}
+
+		return q.DB.QueryRow(q.String(), q.Args()...)
+	}
+
+	return nil
+}
+
 func (q *SelectQuery) String() string {
 	strs := []string{"select"}