简单的Lua 连接操作mysql数据库的方法
投稿：hebedich
lua连接数据库不只luasql这个库，但目前更新最快的的貌似是这个luasql，他是开源的，下面我们就来看看如何来具体操作吧
win 需要先安装luaforwindows
linux 需要安装 luarocks 并 luarocks install luasql-mysql
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 GB2312"
--执行数据库操作
cur=conn:execute("select * from role")
row=cur:fetch({},"a")
while row do
var=string.format("%d%s\n",row.id,row.name)
print(var)
row=cur:fetch(row,"a")
end
conn:close()--关闭数据库连接
env:close()--关闭数据库环境
上面是个简单的，我们再来看个稍微复杂些的例子
-- load driver
require "luasql.mysql"
-- create environment object
env = assert (luasql.mysql())
-- connect to data source
con = assert (env:connect("database", "usr", "password", "192.168.xx.xxx", 3306))
-- reset our table
res = con:execute"DROP TABLE people" --建立新表people
res = assert (con:execute[[
CREATE TABLE people(
name varchar(50),
email varchar(50)
)
]])
-- add a few elements
list = {
{ name="Jose das Couves", email="jose@couves.com", },
{ name="Manoel Joaquim", email="manoel.joaquim@cafundo.com", },
{ name="Maria das Dores", email="maria@dores.com", },
}
for i, p in pairs (list) do --加入数据到people表
res = assert (con:execute(string.format([[
INSERT INTO people
VALUES ('%s', '%s')]], p.name, p.email)
))
end
-- retrieve a cursor
cur = assert (con:execute"SELECT name, email from people") --获取数据
-- print all rows
row = cur:fetch ({}, "a") -- the rows will be indexed by field names --显示出来
while row do
print(string.format("Name: %s, E-mail: %s", row.name, row.email))
row = cur:fetch (row, "a") -- reusing the table of results
end
-- close everything
cur:close()
con:close()
env:close()