improved Delete func

db.go

@@ -15,6 +15,10 @@ type Database struct {
 func InitDatabase(database *Database, conn *sql.DB) {
 	panicOnNil(database)
 
+	if database.db != nil {
+		panic("database is initialized already")
+	}
+
 	*database = Database{
 		db:    conn,
 		stmts: map[string]*sql.Stmt{},

delete.go

@@ -0,0 +1,11 @@
+package advsql
+
+func Delete(db *Database, query string) DeleteFunc {
+	prepareGlobal(db, query)
+
+	return func(args ...interface{}) error {
+		s := db.stmt(query)
+		_, err := s.Exec(args...)
+		return err
+	}
+}

func_types.go

@@ -11,4 +11,6 @@ type QueryOneContextFunc[T any] func(ctx context.Context, args ...interface{}) *
 type InsertFunc[T any] func(v *T) error
 type UpdateFunc[T any] func(v *T) error
 
+type DeleteFunc func(args ...interface{}) error
+
 type ScanFunc = func(args ...interface{}) error

stmt.go

@@ -1,59 +0,0 @@
-package advsql
-
-// import (
-// 	"database/sql"
-// )
-
-// type Stmt[M any] struct {
-// 	stmt *sql.Stmt
-// 	scan func(Scanner) (*M, error)
-// }
-
-// func NewStmt[M any](db *Database, query string, scan func(s Scanner) (*M, error)) (*Stmt[M], error) {
-// 	s, err := db.db.Prepare(query)
-// 	if err != nil {
-// 		return nil, err
-// 	}
-
-// 	stmt := Stmt[M]{
-// 		stmt: s,
-// 		scan: scan,
-// 	}
-// 	db.closefuncs = append(db.closefuncs, stmt.Close)
-// 	return &stmt, err
-// }
-
-// func (stmt *Stmt[M]) Close() error {
-// 	return stmt.stmt.Close()
-// }
-
-// func (stmt *Stmt[M]) Many(args ...interface{}) (<-chan *M, error) {
-// 	rows, err := stmt.stmt.Query(args...)
-// 	if err != nil {
-// 		return nil, err
-// 	}
-
-// 	out := make(chan *M, 10)
-
-// 	go func() {
-// 		defer rows.Close()
-// 		defer close(out)
-
-// 		for rows.Next() {
-// 			if v, err := stmt.scan(rows); err == nil {
-// 				out <- v
-// 			}
-// 		}
-// 	}()
-
-// 	return out, nil
-// }
-
-// func (stmt *Stmt[M]) Single(args ...interface{}) (*M, error) {
-// 	rows, err := stmt.stmt.Query(args...)
-// 	if err != nil {
-// 		return nil, err
-// 	}
-// 	defer rows.Close()
-// 	return stmt.scan(rows)
-// }