lua - luasql nil值

我尝试按照http://www.keplerproject.org/luasql/examples.html的示例进行操作

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 ?
>

我想念什么？

最佳答案

你可以试试

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