add lib for sqlite3 database

SQLiteDB/build/debug/api/api.lua

@@ -0,0 +1,76 @@
+-- collecting arguments
+local args=...
+
+-- require libs
+local vfs = require("vfs")
+local sqlite = modules.sqlite()
+
+-- helper functions
+local result = function(data)
+    return { error = false, result = data }
+end
+
+local error = function(msg)
+    return {error = msg, result = false}
+end
+
+-- handler object
+local handle = {}
+
+-- Handle functions defined here
+
+handle.init = function(data)
+    local os_path = vfs.ospath(data.db_source)
+    local db = sqlite._getdb(os_path)
+    if not db then
+        return error("Unable to open sqlite db file")
+    end
+    sqlite.dbclose(db)
+    return result(true)
+end
+
+handle.query = function(data)
+    local os_path = vfs.ospath(data.db_source)
+    local db = sqlite._getdb(os_path)
+    if not db then
+        return error("Unable to open sqlite db file")
+    end
+    local ret = sqlite.query(db, data.query)
+    sqlite.dbclose(db)
+    if ret ~= 1 then
+        return error("error executing query")
+    end
+    return result(true)
+end
+
+handle.select = function(data)
+    local os_path = vfs.ospath(data.db_source)
+    local db = sqlite._getdb(os_path)
+    if not db then
+        return error("Unable to open sqlite db file")
+    end
+    local ret = sqlite.select(db, data.table, data.fields, data.cond);
+    sqlite.dbclose(db)
+    if not ret then
+        return error("error executing select statement")
+    end
+    return result(ret)
+end
+
+handle.last_insert_id = function(data)
+    local os_path = vfs.ospath(data.db_source)
+    local db = sqlite._getdb(os_path)
+    if not db then
+        return error("Unable to open sqlite db file")
+    end
+    local ret = sqlite.lastInsertID(db)
+    sqlite.dbclose(db)
+    return result(ret)
+end
+
+-- dispatching action
+if args.action and handle[args.action] then
+    return handle[args.action](args.args)
+else
+    return error("Invalid action parameter")
+end