From d40d4905434d5abfab8d29584adc850797897769 Mon Sep 17 00:00:00 2001
From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Date: Mon, 28 Aug 2017 18:58:02 +0900
Subject: [PATCH] fixes #458

---
 sqlite3.go           |  1 +
 sqlite3_go18_test.go | 92 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+)

diff --git a/sqlite3.go b/sqlite3.go
index bff6b7c6..076c9bd4 100644
--- a/sqlite3.go
+++ b/sqlite3.go
@@ -811,6 +811,7 @@ func (s *SQLiteStmt) Close() error {
 		return errors.New("sqlite statement with already closed database connection")
 	}
 	rv := C.sqlite3_finalize(s.s)
+	s.s = nil
 	if rv != C.SQLITE_OK {
 		return s.c.lastError()
 	}
diff --git a/sqlite3_go18_test.go b/sqlite3_go18_test.go
index f076b81e..a5f4aaef 100644
--- a/sqlite3_go18_test.go
+++ b/sqlite3_go18_test.go
@@ -8,9 +8,13 @@
 package sqlite3
 
 import (
+	"context"
 	"database/sql"
+	"fmt"
+	"math/rand"
 	"os"
 	"testing"
+	"time"
 )
 
 func TestNamedParams(t *testing.T) {
@@ -48,3 +52,91 @@ func TestNamedParams(t *testing.T) {
 		t.Error("Failed to db.QueryRow: not matched results")
 	}
 }
+
+var (
+	testTableStatements = []string{
+		`DROP TABLE IF EXISTS test_table`,
+		`
+CREATE TABLE IF NOT EXISTS test_table (
+	key1      VARCHAR(64) PRIMARY KEY,
+	key_id    VARCHAR(64) NOT NULL,
+	key2      VARCHAR(64) NOT NULL,
+	key3      VARCHAR(64) NOT NULL,
+	key4      VARCHAR(64) NOT NULL,
+	key5      VARCHAR(64) NOT NULL,
+	key6      VARCHAR(64) NOT NULL,
+	data      BLOB        NOT NULL
+);`,
+	}
+	letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+)
+
+func randStringBytes(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}
+
+func initDatabase(t *testing.T, db *sql.DB, rowCount int64) {
+	t.Logf("Executing db initializing statements")
+	for _, query := range testTableStatements {
+		_, err := db.Exec(query)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	for i := int64(0); i < rowCount; i++ {
+		query := `INSERT INTO test_table
+			(key1, key_id, key2, key3, key4, key5, key6, data)
+			VALUES
+			(?, ?, ?, ?, ?, ?, ?, ?);`
+		args := []interface{}{
+			randStringBytes(50),
+			fmt.Sprint(i),
+			randStringBytes(50),
+			randStringBytes(50),
+			randStringBytes(50),
+			randStringBytes(50),
+			randStringBytes(50),
+			randStringBytes(50),
+			randStringBytes(2048),
+		}
+		_, err := db.Exec(query, args...)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+func TestShortTimeout(t *testing.T) {
+	db, err := sql.Open("sqlite3", "file::memory:?mode=memory&cache=shared")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	initDatabase(t, db, 10000)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Microsecond)
+	defer cancel()
+	query := `SELECT key1, key_id, key2, key3, key4, key5, key6, data
+		FROM test_table
+		ORDER BY key2 ASC`
+	rows, err := db.QueryContext(ctx, query)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var key1, keyid, key2, key3, key4, key5, key6 string
+		var data []byte
+		err = rows.Scan(&key1, &keyid, &key2, &key3, &key4, &key5, &key6, &data)
+		if err != nil {
+			break
+		}
+	}
+	if context.DeadlineExceeded != ctx.Err() {
+		t.Fatal(ctx.Err())
+	}
+}