4.31. Lua database access

This article mainly introduces the Lua database operation library: LuaSQL . He is open-source and supports databases such as ODBC, ADO , Oracle , MySQL , SQLite , and PostgreSQL.

This article introduces to you MySQL the database connection.

LuaSQL use LuaRocks to install the databasedriver you need to install as needed.

LuaRocks installation method:

$ 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"

Install LuaRocks: keplerproject/luarocks under Window

Install different database drivers:

luarocks install luasql-sqlite3
luarocks install luasql-postgres
luarocks install luasql-mysql
luarocks install luasql-sqlite
luarocks install luasql-odbc

You can also use the source code installation method, Lua Github source address: keplerproject/luasql

Lua connection MySql database:

4.31.1. Example #

require "luasql.mysql"
--Creating Environment Objects
env = luasql.mysql()
--Connect to database
conn = env:connect("Database name, username, password, IP address, port)
--Set the encoding format for the database
conn:execute"SET NAMES UTF8"
--Perform database operations
cur = conn:execute("select * from role")
row = cur:fetch({},"a")
--Creating File Objects
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()  --Close File Object
conn:close()  --Close database connection
env:close()   --Shutdown Database Environment