luasql nil值

Question

我试着在http://www.keplerproject.org/luasql/examples.html学习这个例子。

Lua 5.2.0  Copyright (C) 1994-2011 Lua.org, PUC-Rio
> require "luasql.postgres"
> env = assert (luasql.postgres())
stdin:1: attempt to index global 'luasql' (a nil value)
stack traceback:
    stdin:1: in main chunk
    [C]: in ?
> 

我遗漏了什么？

Answer 1

你可以试一试

luasql = require "luasql.postgres"
env = assert (luasql.postgres())