SQL查询中的内存错误（coredump）

Question

我正在尝试从数据库中读取一行：

此声明工作正常

stmt = conn->createStatement("SELECT * from Customer");
rs = stmt->executeQuery();

虽然显示Memory fault(coredump)

 stmt->setSQL("SELECT * from :1");
 stmt->setString(1,"Customer");
 rs = stmt->executeQuery();