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A Utilitary package functionalities modules for improve a secure performatic development.
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Files
lib/krug/ecto/resultset.handler.ex
defmodule Krug.ResultSetHandler do
@moduledoc """
Module to handle the resultset returned by ```Krug.BaseEctoDAO``` (extended modules) load function.
"""
@moduledoc since: "0.2.0"
alias Krug.StringUtil
@doc """
Concat the value of column ```col``` of all rows of resultset.
Return a string with values delimited with comma char.
- Supose that was load a result as follow:
```elixir
%MyXQL.Result{
columns: ["id", "name", "email", "age", "address"],
connection_id: 1515,
last_insert_id: 0,
num_rows: 1,
num_warnings: 0,
rows: [
[1,"Johannes Backend","johannes@backend.com",54,"404 street"],
[2,"Peter Druggking","peter@thedrugger.com",23,"404 street"],
[3,"Josephine Frontfull","josephine@staline.com",34,"404 street"]
]
}
```
```elixir
iex > Krug.ResultSetHandler.concat_cols_of_result_rows(resultset,0)
"1,2,3"
```
```elixir
iex > Krug.ResultSetHandler.concat_cols_of_result_rows(resultset,1)
"Johannes Backend,Peter Druggking,Josephine Frontfull"
```
```elixir
iex > Krug.ResultSetHandler.concat_cols_of_result_rows(resultset,2)
"johannes@backend.com,peter@thedrugger.com,josephine@staline.com"
```
```elixir
iex > Krug.ResultSetHandler.concat_cols_of_result_rows(resultset,3)
"54,23,34"
```
"""
def concat_cols_of_result_rows(resultset,col \\ 0) do
get_column_values_concat("",resultset,0,col)
end
@doc """
Obtain the value of a column ```col``` of a row ```row``` of resultset.
Return a empty string if value is nil.
- Supose that was load a result as follow:
```elixir
%MyXQL.Result{
columns: ["id", "name", "email", "age", "popularitypercent", "address"],
connection_id: 1515,
last_insert_id: 0,
num_rows: 1,
num_warnings: 0,
rows: [
[1,"Johannes Backend","johannes@backend.com",54,95.7,"404 street"],
[2,"Peter Druggking","peter@thedrugger.com",23,66.6,"404 street"],
[3,"Josephine Frontfull","josephine@staline.com",34,17.3,"404 street"]
]
}
```
And you want transform it to a pretty map array as [%{},%{},%{}], then
you could iterate recursively the resultset, making some as this for each row:
```elixir
%{
id: Krug.ResultSetHandler.get_column_value(resultset,row,0) |> Krug.NumberUtil.to_integer(),
name: Krug.ResultSetHandler.get_column_value(resultset,row,1),
email: Krug.ResultSetHandler.get_column_value(resultset,row,2),
age: Krug.ResultSetHandler.get_column_value(resultset,row,3) |> Krug.NumberUtil.to_integer(),
popularitypercent: Krug.ResultSetHandler.get_column_value(resultset,row,4) |> Krug.NumberUtil.to_float(),
address: Krug.ResultSetHandler.get_column_value(resultset,row,5)
}
```
"""
def get_column_value(resultset,row,col \\ 0) do
array_data = get_row_as_array(resultset,row)
value = cond do
(Enum.empty?(array_data)) -> ""
(!(col >= 0)) -> ""
true -> array_data |> Enum.at(col)
end
"#{value}"
end
defp get_row_as_array(resultset,row) do
cond do
(nil == resultset or nil == resultset.rows or resultset.rows == 0) -> []
(nil == row or !(row >= 0)) -> []
(nil == resultset.rows or Enum.empty?(resultset.rows)) -> []
true -> resultset.rows |> Enum.at(row,[])
end
end
defp get_column_values_concat(string,resultset,row,col) do
value = get_column_value_use_nil(resultset,row,col)
cond do
(nil == value) -> string |> get_column_values_concat(resultset,row + 1,col)
true -> string |> StringUtil.concat(value,",") |> get_column_values_concat(resultset,row + 1,col)
end
end
defp get_column_value_use_nil(resultset,row,col) do
array_data = get_row_as_array(resultset,row)
cond do
(Enum.empty?(array_data)) -> nil
(!(col >= 0)) -> nil
true -> array_data |> Enum.at(col)
end
end
end