LJSQLite3: SQlite3 Interface

Pure LuaJIT binding for SQLite3 databases.

Features

• all SQLite3 types are supported and mapped to LuaJIT types
• efficient implementation via value-binding methods and prepared statements
• ability to extend SQLite3 via scalar and aggregate (Lua) callback functions
• command-line shell feature
• results by row or by whole table

local sql = require "ljsqlite3"
local conn = sql.open("") -- Open a temporary in-memory database.
  
-- Execute SQL commands separated by the ';' character:
conn:exec[[
CREATE TABLE t(id TEXT, num REAL);
INSERT INTO t VALUES('myid1', 200);
]]
  
-- Prepared statements are supported:
local stmt = conn:prepare("INSERT INTO t VALUES(?, ?)")
for i=2,4 do
  stmt:reset():bind('myid'..i, 200*i):step()
end
  
-- Command-line shell feature which here prints all records:
conn "SELECT * FROM t"
--> id    num
--> myid1 200
--> myid2 400
--> myid3 600
--> myid4 800
  
local t = conn:exec("SELECT * FROM t") -- Records are by column.
-- Access to columns via column numbers or names:
assert(t[1] == t.id)
-- Nested indexing corresponds to the record number:
assert(t[1][3] == 'myid3')
  
-- Convenience function returns multiple values for one record:
local id, num = conn:rowexec("SELECT * FROM t WHERE id=='myid3'")
print(id, num) --> myid3 600
 
-- Custom scalar function definition, aggregates supported as well.
conn:setscalar("MYFUN", function(x) return x/100 end)
conn "SELECT MYFUN(num) FROM t"
--> MYFUN(num)
--> 2
--> 4
--> 6
--> 8
 
conn:close() -- Close stmt as well.

Install

This module is included in the ULua distribution, to install it use:

upkg add ljsqlite3

Alternatively, manually install this module making sure that all dependencies listed in the require section of __meta.lua are installed as well (dependencies starting with clib_ are standard C dynamic libraries).

Documentation

Refer to the official documentation.