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69 changes: 69 additions & 0 deletions Connect-with-Exasol/openresty-odbc-connection.md
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# Openresty Exasol ODBC connection
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# Openresty Exasol ODBC connection
# OpenResty Exasol ODBC connection

Below are steps to connect to Exasol from Openresty.

* Install openresty [Openresty Installation manual](https://openresty.org/en/linux-packages.html#ubuntu)
* install Luarocks

```markup
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```markup
```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
```

* install ODBC package in luarocks
```markup
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```markup
```shell

luarocks install odbc
```

* install Exasol ODBC driver, create DSN for Exasol DB [ODBC Drivers for Linux/FreeBSD | Exasol Documentation](https://docs.exasol.com/db/latest/connect_exasol/drivers/odbc/odbc_linux.htm)

* Execute connection test scripts

**odbctest.sh**
```markup
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```markup
```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 $?"
```
**odbctest.lua**
```markup
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```markup
```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
```