Create openresty-odbc-connection.md

[vshilin]

No description provided.

[allipatev]

Maybe you can look at suggestions, add "Background" and "Additional References" sections, and footer, as per "Tutorial" template, so that we could finally merge this one? :)

[allipatev]

Looks good!

I added a couple more cosmetic suggestions.

You can decide if you want to incorporate them, then merge.

[allipatev]

Suggested change

	* install Luarocks
	* Install LuaRocks

[allipatev]

Suggested change

	* install ODBC package in luarocks
	* Install ODBC package in LuaRocks

[allipatev]

Suggested change

	```shell
	wget https://github.com/luarocks/luarocks/archive/v3.0.0.tar.gz
	tar zxvf v3.0.0.tar.gz
	./configure --prefix=/usr/local/openresty/luajit/ --with-lua=/usr/local/openresty/luajit/ --lua-suffix=jit --with-lua-include=/usr/local/openresty/luajit/include/luajit-2.1
	sudo make build
	sudo make install
	```
	```shell
	wget https://github.com/luarocks/luarocks/archive/v3.0.0.tar.gz
	tar zxvf v3.0.0.tar.gz
	./configure --prefix=/usr/local/openresty/luajit/ --with-lua=/usr/local/openresty/luajit/ --lua-suffix=jit --with-lua-include=/usr/local/openresty/luajit/include/luajit-2.1
	sudo make build
	sudo make install
	```

[allipatev]

Suggested change

	```shell
	luarocks install odbc
	```
	```shell
	luarocks install odbc
	```

[allipatev]

Suggested change

	```shell
	# set -x
	# ORHOME is the path to the OpenResty install
	export ORHOME="/usr/local/openresty"
	export ODBCINI="${ORHOME}/odbc/.odbc.ini"
	export LD_LIBRARY_PATH="${ORHOME}/luajit/lib"
	export PATH="$PATH:${ORHOME}/bin/"
	resty odbctest.lua $1
	echo "Retun code from resty $?"
	```
	```shell
	# set -x
	# ORHOME is the path to the OpenResty install
	export ORHOME="/usr/local/openresty"
	export ODBCINI="${ORHOME}/odbc/.odbc.ini"
	export LD_LIBRARY_PATH="${ORHOME}/luajit/lib"
	export PATH="$PATH:${ORHOME}/bin/"
	resty odbctest.lua $1
	echo "Retun code from resty $?"
	```

[allipatev]

Suggested change

	```lua
	local odbc = require("odbc")
	local call = [[select * from sys.exa_all_tables]]
	print("Using dsn " .. arg[1])
	local DSN = arg[1]
	print("About to connect")
	local cnn,err = odbc.connect(DSN)
	if cnn == nil then
	print("Failed to connect" .. err.message)
	else
	print("Connected")
	end
	local stmt,err = cnn:statement()
	if stmt == nil then
	print("Failed to prepare Statement" ..err.message)
	else
	print("Prepared statement" )
	end
	local ret,err = stmt:execute(call)
	if ret == nil then
	print("Failed to execute statement" .. err.message)
	else
	print("Executed satement")
	end
	local cols = ret:colnames()
	if string.upper(cols[1]) == [[ERR]] then
	-- There has been some sort of error
	print("Some sort of error was raised " .. ret:fetch())
	end
	```
	```lua
	local odbc = require("odbc")
	local call = [[select * from sys.exa_all_tables]]
	print("Using dsn " .. arg[1])
	local DSN = arg[1]
	print("About to connect")
	local cnn,err = odbc.connect(DSN)
	if cnn == nil then
	print("Failed to connect" .. err.message)
	else
	print("Connected")
	end
	local stmt,err = cnn:statement()
	if stmt == nil then
	print("Failed to prepare Statement" ..err.message)
	else
	print("Prepared statement" )
	end
	local ret,err = stmt:execute(call)
	if ret == nil then
	print("Failed to execute statement" .. err.message)
	else
	print("Executed satement")
	end
	local cols = ret:colnames()
	if string.upper(cols[1]) == [[ERR]] then
	-- There has been some sort of error
	print("Some sort of error was raised " .. ret:fetch())
	end
	```