private object ParseCommand()
{
if (Connection.State != ConnectionState.Open)
{
throw new Exception("Cmd001: Connection must be open before calling a command");
}
foreach (FakeParameter param in _parameterCollection)
{
CommandText = CommandText.Replace(param.ParameterName, param.Value.ToString());
}
FakeQuery operations = JsonConvert.DeserializeObject <FakeQuery>(CommandText);
object result = null;
{
{
if (operations.Create != null)
{
if (operations.Create.Table == null)
{
throw new FakeException("Create:Table is not specified");
}
{
FakeDatabase db = JsonConvert.DeserializeObject <FakeDatabase>(File.ReadAllText(Connection.Database));
if (db == null)
{
db = new FakeDatabase()
{
Name = Connection.Database
}
}
;
if (db.Tables.Find(x => x.Name == operations.Create.Table.Name) != null)
{
throw new FakeException("Create:Table is already exists");
}
db.Tables.Add(operations.Create.Table);
File.WriteAllText(Connection.Database, JsonConvert.SerializeObject(db));
}
result = 1;
}
else if (operations.Insert != null)
{
int rowsAffected = 0;
{
FakeDatabase db = JsonConvert.DeserializeObject <FakeDatabase>(File.ReadAllText(Connection.Database));
var table = db.Tables.Find(x => x.Name == operations.Insert.Into);
if (table == null)
{
throw new FakeException("Insert:Table is not exists");
}
List <object> rows = new List <object>();
for (int i = 0; i < table.Headers.Count; i++)
{
rows.Add(new object());
}
for (int i = 0; i < operations.Insert.Values.Count; i++)
{
int index = i % operations.Insert.Headers.Count;
var header = table.Headers.Find(x => x.Name == operations.Insert.Headers[index]);
if (header.Attributes.Contains(FakeDbAttribute.NotNull) && operations.Insert.Values[i] == null)
{
throw new FakeException($"Insert: Field {operations.Insert.Headers[index]} has NotNull attribute, but passed value is null");
}
rows[i] = operations.Insert.Values[i];
if (i % operations.Insert.Headers.Count == operations.Insert.Headers.Count - 1)
{
table.Rows.Add(rows);
rows = new List <object>(table.Headers.Count);
rowsAffected++;
}
}
File.WriteAllText(Connection.Database, JsonConvert.SerializeObject(db));
}
result = rowsAffected;
}
else if (operations.Update != null)
{
int rowsAffected = 0;
{
FakeDatabase db = JsonConvert.DeserializeObject <FakeDatabase>(File.ReadAllText(Connection.Database));
var table = db.Tables.Find(x => x.Name == operations.Update.Table);
// Parse where
string[] words = operations.Update.Where.Split('=');
int index = table.Headers.FindIndex(u => u.Name == words[0]);
foreach (var row in table.Rows.Where(u => u[index].ToString() == words[1].Trim()))
{
for (int i = 0; i < operations.Update.To.Count; i++)
{
int idx = table.Headers.FindIndex(x => x.Name.ToLower() == operations.Update.To[i].Field.Trim().ToLower());
row[idx] = operations.Update.To[i].Value;
}
rowsAffected++;
}
File.WriteAllText(Connection.Database, JsonConvert.SerializeObject(db));
}
result = rowsAffected;
}
else if (operations.Delete != null)
{
int rowsAffected = 0;
{
FakeDatabase db = JsonConvert.DeserializeObject <FakeDatabase>(File.ReadAllText(Connection.Database));
var table = db.Tables.Find(x => x.Name == operations.Delete.From);
// Parse where
string[] words = operations.Delete.Where.Split('=');
int index = table.Headers.FindIndex(u => u.Name == words[0]);
var rowsToDelete = table.Rows.Where(u => u[index].ToString() == words[1].Trim()).ToList();
for (int i = 0; i < rowsToDelete.Count; i++)
{
table.Rows.Remove(rowsToDelete[i]);
rowsAffected++;
}
File.WriteAllText(Connection.Database, JsonConvert.SerializeObject(db));
}
result = rowsAffected;
}
else if (operations.Select != null)
{
{
FakeDatabase db = JsonConvert.DeserializeObject <FakeDatabase>(File.ReadAllText(Connection.Database));
var table = db.Tables.Find(x => x.Name == operations.Select.From);
List <List <object> > rowsToSelect;
if (operations.Select.Where != null)
{
// Where filter
string[] words = operations.Select.Where.Split('=');
int index = table.Headers.FindIndex(u => u.Name == words[0]);
rowsToSelect = table.Rows.Where(u => u[index].ToString() == words[1].Trim()).ToList();
}
else
{
// Without where
rowsToSelect = table.Rows;
}
List <List <object> > tableResults = new List <List <object> >();
List <object> headers = new List <object>();
List <int> indices = new List <int>();
if (operations.Select.Fields != null && operations.Select.Fields.Count > 0)
{
// Fields filter
for (int i = 0; i < operations.Select.Fields.Count; i++)
{
int indexOfHeader = table.Headers.FindIndex(u => u.Name == operations.Select.Fields[i]);
if (indexOfHeader == -1)
{
throw new FakeException($"Select: Field {operations.Select.Fields[i]} is not exists");
}
headers.Add(operations.Select.Fields[i]);
indices.Add(indexOfHeader);
}
}
else
{
// All fields
for (int i = 0; i < table.Headers.Count; i++)
{
headers.Add(table.Headers[i].Name);
indices.Add(i);
}
}
tableResults.Add(headers);
foreach (List <object> row in rowsToSelect)
{
List <object> fieldRow = new List <object>();
for (int i = 0; i < indices.Count; i++)
{
fieldRow.Add(row[indices[i]]);
}
tableResults.Add(fieldRow);
}
result = tableResults;
}
}
}
}
return(result);
}
