public async Task <IEnumerable <MD5Sum> > GetDescendantIds(MD5Sum documentId)
{
var builder = ImmutableArray.CreateBuilder <MD5Sum>();
using (var connection = new NpgsqlConnection(connectionString))
{
await connection.OpenAsync();
using (var cmd = new NpgsqlCommand())
{
cmd.Connection = connection;
cmd.CommandText = "SELECT descendantId FROM relation WHERE antecedentId=@documentId;";
cmd.Parameters.AddWithValue("@documentId", documentId.ToGuid());
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
var figure = reader.GetGuid(0);
builder.Add(new MD5Sum(figure.ToByteArray()));
}
}
}
}
return(builder);
}
public async Task <string> GetDocumentBodyAsync(MD5Sum id, bool ignoreBlock = false)
{
using (var connection = new NpgsqlConnection(connectionString))
{
await connection.OpenAsync();
if (!ignoreBlock)
{
using (var cmd = new NpgsqlCommand())
{
cmd.Connection = connection;
cmd.CommandText = "SELECT isVoluntary FROM documentBlock WHERE id=@id;";
cmd.Parameters.AddWithValue("@id", id.ToGuid());
using (var reader = await cmd.ExecuteReaderAsync())
{
if (await reader.ReadAsync())
{
throw new DocumentBlockedException(reader.GetBoolean(0));
}
}
}
}
using (var cmd = new NpgsqlCommand())
{
cmd.Connection = connection;
cmd.CommandText = "SELECT body FROM documentBody WHERE id=@id;";
cmd.Parameters.AddWithValue("@id", id.ToGuid());
using (var reader = await cmd.ExecuteReaderAsync())
{
if (await reader.ReadAsync())
{
return(reader.GetString(0));
}
throw new FileNotFoundException();
}
}
}
}
public async Task <IEnumerable <Relation> > GetFamilyAsync(MD5Sum familyMemberId)
{
var idBoxedInGuidForDatabase = familyMemberId.ToGuid();
var relationsBuilder = ImmutableHashSet.CreateBuilder <Relation>();
var closedSet = ImmutableHashSet.CreateBuilder <Guid>();
var openSet = ImmutableHashSet.CreateBuilder <Guid>();
openSet.Add(idBoxedInGuidForDatabase);
using (var connection = new NpgsqlConnection(connectionString))
{
await connection.OpenAsync();
while (openSet.Count > 0)
{
var openSetAsArray = openSet.ToArray();
closedSet.UnionWith(openSet);
openSet.Clear();
using (var cmd = new NpgsqlCommand())
{
cmd.Connection = connection;
cmd.CommandText = "SELECT antecedentId, descendantId FROM relation WHERE ARRAY[antecedentId, descendantId] && @openSet;";
cmd.Parameters.AddWithValue("@openSet", openSetAsArray);
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
var alfa = reader.GetGuid(0);
var bravo = reader.GetGuid(1);
openSet.Add(alfa);
openSet.Add(bravo);
relationsBuilder.Add(new Relation(new MD5Sum(alfa.ToByteArray()), new MD5Sum(bravo.ToByteArray())));
}
}
}
openSet.ExceptWith(closedSet);
}
}
return(relationsBuilder);
}
public async Task <DocumentMetadata> GetDocumentMetadataAsync(MD5Sum id)
{
using (var connection = new NpgsqlConnection(connectionString))
{
await connection.OpenAsync();
using (var cmd = new NpgsqlCommand())
{
cmd.Connection = connection;
cmd.CommandText = "SELECT title,authorId,timestamp FROM document WHERE id=@id;";
cmd.Parameters.AddWithValue("@id", id.ToGuid());
using (var reader = await cmd.ExecuteReaderAsync())
{
if (await reader.ReadAsync())
{
return(new DocumentMetadata(id, reader.GetString(0), reader.GetGuid(1), reader.GetDateTime(2)));
}
throw new FileNotFoundException();
}
}
}
}
