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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/storage/query_stream_info.ex
defmodule EventStore.Storage.QueryStreamInfo do
@moduledoc false
alias EventStore.Sql.Statements
def execute(conn, stream_uuid, opts) do
{schema, opts} = Keyword.pop(opts, :schema)
query = Statements.query_stream_info(schema)
case Postgrex.query(conn, query, [stream_uuid], opts) do
{:ok, %Postgrex.Result{num_rows: 0}} ->
{:ok, nil, 0, nil}
{:ok, %Postgrex.Result{rows: [[stream_id, nil, deleted_at]]}} ->
{:ok, stream_id, 0, deleted_at}
{:ok, %Postgrex.Result{rows: [[stream_id, stream_version, deleted_at]]}} ->
{:ok, stream_id, stream_version, deleted_at}
{:error, _error} = reply ->
reply
end
end
end