Lua语法--20数据库访问

黄振国

#LuaRocks 安装方法：https://www.runoob.com/lua/lua-database-access.html
$ wget http://luarocks.org/releases/luarocks-2.2.1.tar.gz
$ tar zxpf luarocks-2.2.1.tar.gz
$ cd luarocks-2.2.1
$ ./configure; sudo make bootstrap
$ sudo luarocks install luasocket
$ lua
Lua 5.3.0 Copyright (C) 1994-2015 Lua.org, PUC-Rio
> require "socket"

#Lua 连接MySql 数据库
===============================================
#!/usr/local/bin/lua

require "luasql.mysql"

--创建环境对象
env = luasql.mysql()

--连接数据库
conn = env:connect("数据库名","用户名","密码","IP地址",端口)

--设置数据库的编码格式
conn:execute"SET NAMES UTF8"

--执行数据库操作
cur = conn:execute("select * from role")

row = cur:fetch({},"a")

--文件对象的创建
file = io.open("role.txt","w+");

while row do
    var = string.format("%d %s\n", row.id, row.name)

    print(var)

    file:write(var)

    row = cur:fetch(row,"a")
end


file:close()  --关闭文件对象
conn:close()  --关闭数据库连接
env:close()   --关闭数据库环境
===============================================