Add savepoint helper methods.

sqlite.go

@@ -443,6 +443,21 @@ func (c *Conn) Rollback() error {
 	return c.exec("ROLLBACK")
 }
 
+// (See http://sqlite.org/lang_savepoint.html)
+func (c *Conn) Savepoint(name string) error {
+	return c.exec(Mprintf("SAVEPOINT %Q", name))
+}
+
+// (See http://sqlite.org/lang_savepoint.html)
+func (c *Conn) ReleaseSavepoint(name string) error {
+	return c.exec(Mprintf("RELEASE %Q", name))
+}
+
+// (See http://sqlite.org/lang_savepoint.html)
+func (c *Conn) RollbackSavepoint(name string) error {
+	return c.exec(Mprintf("ROLLBACK TO SAVEPOINT %Q", name))
+}
+
 func (c *Conn) exec(cmd string) error {
 	s, err := c.prepare(cmd)
 	if err != nil {

sqlite_test.go

@@ -76,6 +76,15 @@ func TestTransaction(t *testing.T) {
 	checkNoError(t, db.Commit(), "Error while commiting transaction: %s")
 }
 
+func TestSavepoint(t *testing.T) {
+	db := open(t)
+	defer db.Close()
+	checkNoError(t, db.Savepoint("1"), "Error while creating savepoint: %s")
+	checkNoError(t, db.Savepoint("2"), "Error while creating savepoint: %s")
+	checkNoError(t, db.RollbackSavepoint("2"), "Error while creating savepoint: %s")
+	checkNoError(t, db.ReleaseSavepoint("1"), "Error while creating savepoint: %s")
+}
+
 func TestExists(t *testing.T) {
 	db := open(t)
 	defer db.Close()