How do I create an Sqlite3 database using luasql? - database

Question

I am trying to create a Sqlite3 database with luasql. After I require luasql.sqlite3, how do I create the database on a file?
Also, I can't seem to find the manual for luasql. Is it available anywhere?

Answer 1

SQLLite will create the db automatically if it does not exist.
Here is a set of Sample functions for using it in Lua (ignore the fh functions they are just internal to the program I use).
require 'luasql.sqlite3'
function opendb(dbname)
-- Check for Settings Database and create if needed
local db = fhGetPluginDataFileName()
local dbenv = assert (luasql.sqlite3())
-- connect to data source, if the file does not exist it will be created
dbcon = assert (dbenv:connect(db))
-- check table for page list
checkTable(dbcon,'pagelist',
[[CREATE TABLE pagelist(filename varchar(500), md5hash varchar(32),UNIQUE (filename))
]])
-- create table for settings
checkTable(dbcon,'settings',
[[CREATE TABLE settings(key varchar(20), directory varchar(500),
host varchar(500), folder varchar(50), userid varchar(50), password varchar(50), UNIQUE (key))
]])
return dbenv,dbcon
end
function checkTable(dbcon,table,createString)
local sql = string.format([[SELECT count(name) as count FROM sqlite_master WHERE type='table' AND name='%s']],table)
local cur = assert(dbcon:execute(sql))
local rowcount = cur:fetch (row, "a")
cur:close()
if tonumber(rowcount) == 0 then
-- Table not found create it
res,err = assert(dbcon:execute(createString))
end
end
function closedb(dbenv,dbcon)
dbcon:close()
dbenv:close()
end
function loadSettings(dbcon)
local sql = [[SELECT * FROM settings]]
local cur,err = assert(dbcon:execute(sql))
local row = cur:fetch({},'a')
cur:close()
if row then
return row
else
-- return default values
return {
directory = fhGetContextInfo('CI_PROJECT_PUBLIC_FOLDER')..'\\FH Website',
host = 'websitehost',
folder = '/',
userid = 'user',
password = 'password',
new = 'yes'
}
end
end
function saveSettings(dbcon,settings)
-- Check for Settings
if settings.new == 'yes' then
-- Create
sql = string.format([[insert into settings (directory, host, folder, userid, password) Values('%s','%s','%s','%s','%s')]],settings.directory,settings.host,settings.folder,settings.userid,settings.password)
else
-- Update
sql = string.format([[update settings set directory = '%s', host = '%s',folder = '%s',userid = '%s', password = '%s']],settings.directory,settings.host,settings.folder,settings.userid,settings.password)
end
local res = assert(dbcon:execute(sql))
end