Online backup.

tests/backup_test.go

@@ -0,0 +1,94 @@
+package tests
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func TestBackup(t *testing.T) {
+	t.Parallel()
+
+	backupName := filepath.Join(t.TempDir(), "backup.db")
+
+	func() { // Create backup.
+		db, err := sqlite3.Open(":memory:")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer db.Close()
+
+		err = db.Exec(`CREATE TABLE IF NOT EXISTS users (id INT, name VARCHAR(10))`)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		err = db.Exec(`INSERT INTO users (id, name) VALUES (0, 'go'), (1, 'zig'), (2, 'whatever')`)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		err = db.Backup("main", backupName)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		err = db.Close()
+		if err != nil {
+			t.Fatal(err)
+		}
+	}()
+
+	func() { // Restore backup.
+		db, err := sqlite3.Open(":memory:")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer db.Close()
+
+		err = db.Restore("main", backupName)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		stmt, _, err := db.Prepare(`SELECT id, name FROM users`)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer stmt.Close()
+
+		row := 0
+		ids := []int{0, 1, 2}
+		names := []string{"go", "zig", "whatever"}
+		for ; stmt.Step(); row++ {
+			id := stmt.ColumnInt(0)
+			name := stmt.ColumnText(1)
+
+			if id != ids[row] {
+				t.Errorf("got %d, want %d", id, ids[row])
+			}
+			if name != names[row] {
+				t.Errorf("got %q, want %q", name, names[row])
+			}
+		}
+		if row != 3 {
+			t.Errorf("got %d, want %d", row, len(ids))
+		}
+
+		if err := stmt.Err(); err != nil {
+			t.Fatal(err)
+		}
+
+		err = stmt.Close()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		err = db.Close()
+		if err != nil {
+			t.Fatal(err)
+		}
+	}()
+}