fix trace callback.

Close #352

sqlite3_go18_test.go

@@ -9,6 +9,7 @@ package sqlite3
 
 import (
 	"database/sql"
+	"fmt"
 	"os"
 	"testing"
 )
@@ -48,3 +49,58 @@ func TestNamedParams(t *testing.T) {
 		t.Error("Failed to db.QueryRow: not matched results")
 	}
 }
+
+func TestMultipleResultSet(t *testing.T) {
+	tempFilename := TempFilename(t)
+	defer os.Remove(tempFilename)
+	db, err := sql.Open("sqlite3", tempFilename)
+	if err != nil {
+		t.Fatal("Failed to open database:", err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec(`
+	create table foo (id integer, name text);
+	`)
+	if err != nil {
+		t.Error("Failed to call db.Query:", err)
+	}
+
+	for i := 0; i < 100; i++ {
+		_, err = db.Exec(`insert into foo(id, name) values(?, ?)`, i+1, fmt.Sprintf("foo%03d", i+1))
+		if err != nil {
+			t.Error("Failed to call db.Exec:", err)
+		}
+	}
+
+	rows, err := db.Query(`
+	select id, name from foo where id < :id1;
+	select id, name from foo where id = :id2;
+	select id, name from foo where id > :id3;
+	`,
+		sql.Param(":id1", 3),
+		sql.Param(":id2", 50),
+		sql.Param(":id3", 98),
+	)
+	if err != nil {
+		t.Error("Failed to call db.Query:", err)
+	}
+
+	var id int
+	var extra string
+
+	for {
+		for rows.Next() {
+			err = rows.Scan(&id, &extra)
+			if err != nil {
+				t.Error("Failed to db.Scan:", err)
+			}
+			if id != 1 || extra != "foo" {
+				t.Error("Failed to db.QueryRow: not matched results")
+			}
+		}
+		if !rows.NextResultSet() {
+			break
+		}
+	}
+}