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Overview
| Comment: | Move retrieval of existing messageIDs to FolderMessages repository. |
|---|---|
| Timelines: | family | ancestors | descendants | both | dotnet |
| Files: | files | file ages | folders |
| SHA1: |
b5185ef288b790633ce29ebf42edea8a |
| User & Date: | tinus 2019-09-13 18:54:26 |
| Wiki: | dotnet |
Context
|
2019-09-13
| ||
| 18:56 | More logical population of message-related things. check-in: 94dd79783d user: tinus tags: dotnet | |
| 18:54 | Move retrieval of existing messageIDs to FolderMessages repository. check-in: b5185ef288 user: tinus tags: dotnet | |
|
2019-09-10
| ||
| 19:32 | Added repository for MessageReferences. check-in: e1327afe6c user: tinus tags: dotnet | |
Changes
Changes to MailSynchronizer.cs.
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Con.WriteLineErr("\t!!! No access to folder!", ConsoleColor.Red);
return;
}
try
{
// Get the entire list of UIDs for this folder
Con.WriteLine("\tFetching list of message UIDs...", TraceLevel.Verbose);
Dictionary<ulong, (long? folderMsgID, long? messageID)> messageIDs;
var summaries = await mailFolder.FetchAsync(0, -1, MessageSummaryItems.UniqueId
| MessageSummaryItems.Flags
| MessageSummaryItems.InternalDate
| MessageSummaryItems.Size
| MessageSummaryItems.GMailMessageId
| MessageSummaryItems.GMailLabels,
_cancellationToken);
using (var work = new UnitOfWork(_cancellationToken))
{
IQueryable<FolderMessage> folderMessages = work.DB.FolderMessages
.Where(folderMsg => folderMsg.FolderID == dbFolder.ID);
// Check for deleted messages, and delete them from the database
Con.WriteLine("\tChecking for deleted messages...", TraceLevel.Verbose);
var uidsOnServer = summaries.Select(item => item.UniqueId.Id);
var deletedMessageIDs = await folderMessages
.Where(fm => !uidsOnServer.Contains(fm.UID))
.Select(fm => fm.ID)
.ToListAsync(_cancellationToken);
if (deletedMessageIDs.Any())
{
Con.WriteLine($"\tDeleting {deletedMessageIDs.Count} messages.", TraceLevel.Verbose);
work.FolderMessages.DeleteByIDs(deletedMessageIDs);
_haveDeleted = true;
}
................................................................................
// Skip the messages we downloaded before...
uint maxUID = await work.FolderMessages.GetMaxUIDAsync(dbFolder);
int oldCount = summaries.Count;
summaries = summaries.Where(s => s.UniqueId.Id > maxUID).ToList();
_totalCountAllFolders -= (oldCount - summaries.Count);
Con.WriteLine("\tMatching up with existing messages...", TraceLevel.Verbose);
var globalIDs = summaries.Select(s => s.GMailMessageId.Value);
var idSets = from dbMessage in work.DB.Messages
where globalIDs.Contains(dbMessage.GlobalID.Value)
join folderMsg in folderMessages
on dbMessage.ID equals folderMsg.MessageID
into folderMsgs
from folderMsg in folderMsgs.DefaultIfEmpty()
select new
{
globalID = dbMessage.GlobalID.Value,
folderMsgID = folderMsg == null ? 0 : folderMsg.ID,
messageID = dbMessage == null ? 0 : dbMessage.ID,
};
messageIDs = await idSets.ToDictionaryAsync(idSet => idSet.globalID,
idSet => (idSet.folderMsgID == 0 ? (long?)null : idSet.folderMsgID,
idSet.messageID == 0 ? (long?)null : idSet.messageID),
_cancellationToken);
}
int totalCount = summaries.Count, counter = 0;
Con.WriteLine($"\tFetching {totalCount} new and/or updated messages...", TraceLevel.Verbose);
DateTime start = DateTime.UtcNow;
DateTime lastProgressUpdate = DateTime.MinValue;
foreach (var summary in summaries)
................................................................................
// Otherwise, check out the existing message
Message dbMessage = null;
if (messageID != null)
{
dbMessage = await work.Messages.GetByIdAsync(messageID.Value);
}
if (folderMsgID == null
&& dbMessage != null
&& summary.Flags == dbMessage.Flags
&& summary.InternalDate == dbMessage.DateReceived
&& string.Join(", ", summary.Keywords) == dbMessage.Keywords)
{
var folderMessage = new FolderMessage
{
FolderID = folderID,
UniqueId = summary.UniqueId,
Message = dbMessage,
};
await work.FolderMessages.AddAsync(folderMessage);
}
else if (dbMessage == null
|| folderMsgID == null
|| summary.Flags != dbMessage.Flags
|| summary.InternalDate != dbMessage.DateReceived
|| string.Join(", ", summary.Keywords) != dbMessage.Keywords)
{
MimeMessage mailMessage;
try
{
mailMessage = await mailFolder.GetMessageAsync(summary.UniqueId, _cancellationToken);
}
catch (FormatException)
{
var mailEncoding = Encoding.GetEncoding("ISO-8859-1");
// Upon failure to parse the message, try to download the entire message stream
using (Stream mailStream = await mailFolder.GetStreamAsync(summary.UniqueId, 0, (int)summary.Size.Value, _cancellationToken))
using (StreamReader reader = new StreamReader(mailStream, mailEncoding, true))
{
using (var fs = new FileStream($"{summary.GMailMessageId}.eml", FileMode.Create, FileAccess.ReadWrite, FileShare.Read))
{
await mailStream.CopyToAsync(fs, _cancellationToken);
mailStream.Position = 0;
}
// Now, attempt to fix the mail message, by skipping lines until one doesn't start with a spacing character
var sbSource = new StringBuilder((int)mailStream.Length);
while (!reader.EndOfStream)
{
string line = await reader.ReadLineAsync();
if (line.Length > 0 && !line.StartsWith(' ') && !line.StartsWith('\t'))
{
sbSource.Append(line);
sbSource.Append("\r\n");
sbSource.Append(await reader.ReadToEndAsync());
}
}
using (var fixedStream = new MemoryStream((int)mailStream.Length))
{
await fixedStream.WriteAsync(reader.CurrentEncoding.GetBytes(sbSource.ToString()), _cancellationToken);
fixedStream.Position = 0;
var options = new ParserOptions
{
AddressParserComplianceMode = RfcComplianceMode.Loose,
AllowAddressesWithoutDomain = true,
AllowUnquotedCommasInAddresses = false,
CharsetEncoding = mailEncoding,
MaxAddressGroupDepth = 3,
ParameterComplianceMode = RfcComplianceMode.Loose,
RespectContentLength = true,
Rfc2047ComplianceMode = RfcComplianceMode.Loose,
};
mailMessage = await MimeMessage.LoadAsync(options, fixedStream, _cancellationToken);
}
}
}
// save message to database
var folderMessage = await work.DB.FolderMessages
.Where(fm => fm.ID == folderMsgID)
.Include(fm => fm.Message)
.ThenInclude(m => m.Participants)
.SingleOrDefaultAsync(_cancellationToken);
if (folderMessage == null)
{
folderMessage = new FolderMessage
{
FolderID = folderID,
UniqueId = summary.UniqueId,
Message = dbMessage ?? new Message
................................................................................
throw; // those need to fall through
}
await Con.WriteLineAsync();
await Con.WriteLineAsync(ex);
}
}
}
public async Task ClearUnunsedObjectsAsync(bool vacuumDatabase = false)
{
using (var work = new UnitOfWork(_cancellationToken))
{
await Con.WriteLineAsync("Cleaning up database...", TraceLevel.Verbose);
................................................................................
}
}
}
private async Task PopulateMessageAsync(UnitOfWork work, Message targetMsg, MimeMessage sourceMsg,
IEnumerable<string> keywords, IEnumerable<string> labels)
{
targetMsg.RfcMessageID = sourceMsg.ResentMessageId ?? sourceMsg.MessageId;
targetMsg.Subject = sourceMsg.Subject;
targetMsg.Date = sourceMsg.Date;
targetMsg.From = new InternetAddressList(sourceMsg.From.Concat(sourceMsg.ResentFrom)).ToString();
targetMsg.To = new InternetAddressList(sourceMsg.To.Concat(sourceMsg.ResentTo)).ToString();
targetMsg.Cc = new InternetAddressList(sourceMsg.Cc.Concat(sourceMsg.ResentCc)).ToString();
targetMsg.Bcc = new InternetAddressList(sourceMsg.Bcc.Concat(sourceMsg.ResentBcc)).ToString();
targetMsg.Keywords = string.Join(", ", keywords);
................................................................................
GatherParticipants(ref participantList, sourceMsg.ResentSender, ParticipantField.ResentSender);
int order = 0;
foreach (var (field, mailAddress, mailName) in participantList)
{
string address = mailAddress == "" ? null : mailAddress;
string name = mailName == "" ? null : mailName;
if (name.Trim(' ', '\'', '"', '<', '>', '(', ')') == address)
name = null;
var msgParticipant = new MessageParticipant
{
Message = targetMsg,
Field = field,
Order = ++order,
................................................................................
}
else
{
var participant = new Participant
{
Address = address,
Name = name,
Messages = new List<MessageParticipant>(),
};
await work.Participants.AddAsync(participant);
// We only know the IDs after saving the entities
await work.SaveChangesAsync();
_participants.TryAdd(key, participant.ID);
msgParticipant.Participant = participant;
}
await work.DB.MessageParticipants.AddAsync(msgParticipant, _cancellationToken);
}
await work.SaveChangesAsync();
} // PopulateParticipantsAsync
private async Task PopulateKeywordsAsync(UnitOfWork work, Message targetMsg,
IEnumerable<string> keywords, IEnumerable<string> labels)
{
// Store the keywords separately, and link them to this message
var allKeywords = keywords.Select(k => (Name: k, IsLabel: false))
.Concat(labels.Select(l => (Name: l, IsLabel: true)));
var pairs = allKeywords.Select(mailKeyword => (mailKeyword: mailKeyword,
keywordID: _keywords.GetValueOrDefault(mailKeyword, 0)));
var keywordSets = from pair in pairs
join dbMsgKeyword in work.DB.MessageKeywords.Where(mk => mk.Message == targetMsg)
on pair.keywordID equals dbMsgKeyword.KeywordID
into msgKeywordSet
from dbMsgKeyword in msgKeywordSet.DefaultIfEmpty()
select (pair.mailKeyword.Name,
pair.mailKeyword.IsLabel,
msgKeywordID: dbMsgKeyword == null ? (long?)null : dbMsgKeyword.ID,
keywordID: pair.keywordID == 0 ? (long?)null : pair.keywordID);
int index = 0;
foreach ((string mailKeyword, bool isLabel, long? msgKeywordID, long? keywordID) in keywordSets)
{
index++;
if (msgKeywordID == null)
{
long kwID = keywordID ?? 0;
if (kwID == 0)
{
var keyword = new Keyword
{
Name = mailKeyword,
IsLabel = isLabel
};
await work.Keywords.AddAsync(keyword);
await work.SaveChangesAsync();
kwID = keyword.ID;
_keywords.Add((mailKeyword, isLabel), kwID);
}
await work.DB.MessageKeywords.AddAsync(new MessageKeyword
{
Message = targetMsg,
Order = index,
KeywordID = kwID,
}, _cancellationToken);
}
}
}
/// <summary>
/// Store any references between messages.
................................................................................
var dbMessageRefs = await work.MessageReferences
.GetDictionaryAsync(mr => mr.Message == targetMsg,
mr => mr.ReferencedRfcMessageID,
mr => mr);
var dbReferencedMessageIDs = work.Messages
.GetLookup(m => sourceReferences.Contains(m.RfcMessageID),
m => m.RfcMessageID,
m => m?.ID);
int index = 0;
foreach (string mailRef in sourceReferences)
{
index++;
MessageReference dbReference = dbMessageRefs.GetValueOrDefault(mailRef, null);
long? dbMessageID = null;
if (dbReferencedMessageIDs.Contains(mailRef))
|
< < > < < | | | | | | < < < < < < < < < < < < < < < > | < | | > < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | | | | | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | < | | > | | | < > | < > | | | | | | | |
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Con.WriteLineErr("\t!!! No access to folder!", ConsoleColor.Red);
return;
}
try
{
// Get the entire list of UIDs for this folder
Con.WriteLine("\tFetching list of message UIDs...", TraceLevel.Verbose);
var summaries = await mailFolder.FetchAsync(0, -1, MessageSummaryItems.UniqueId
| MessageSummaryItems.Flags
| MessageSummaryItems.InternalDate
| MessageSummaryItems.Size
| MessageSummaryItems.GMailMessageId
| MessageSummaryItems.GMailLabels,
_cancellationToken);
Dictionary<ulong, (long? folderMsgID, long? messageID)> messageIDs;
using (var work = new UnitOfWork(_cancellationToken))
{
// Check for deleted messages, and delete them from the database
Con.WriteLine("\tChecking for deleted messages...", TraceLevel.Verbose);
var uidsOnServer = summaries.Select(item => item.UniqueId.Id);
var deletedMessageIDs = work.FolderMessages
.Select(fm => fm.FolderID == dbFolder.ID && !uidsOnServer.Contains(fm.UID),
fm => fm.ID)
.ToList();
if (deletedMessageIDs.Any())
{
Con.WriteLine($"\tDeleting {deletedMessageIDs.Count} messages.", TraceLevel.Verbose);
work.FolderMessages.DeleteByIDs(deletedMessageIDs);
_haveDeleted = true;
}
................................................................................
// Skip the messages we downloaded before...
uint maxUID = await work.FolderMessages.GetMaxUIDAsync(dbFolder);
int oldCount = summaries.Count;
summaries = summaries.Where(s => s.UniqueId.Id > maxUID).ToList();
_totalCountAllFolders -= (oldCount - summaries.Count);
Con.WriteLine("\tMatching up with existing messages...", TraceLevel.Verbose);
IEnumerable<ulong> globalIDs = summaries.Select(s => s.GMailMessageId.Value);
messageIDs = await work.FolderMessages.GetIDsByGlobalIDAsync(dbFolder.ID, globalIDs);
}
int totalCount = summaries.Count, counter = 0;
Con.WriteLine($"\tFetching {totalCount} new and/or updated messages...", TraceLevel.Verbose);
DateTime start = DateTime.UtcNow;
DateTime lastProgressUpdate = DateTime.MinValue;
foreach (var summary in summaries)
................................................................................
// Otherwise, check out the existing message
Message dbMessage = null;
if (messageID != null)
{
dbMessage = await work.Messages.GetByIdAsync(messageID.Value);
}
FolderMessage folderMessage = null;
if (folderMsgID == null
&& dbMessage != null
&& summary.Flags == dbMessage.Flags
&& summary.InternalDate == dbMessage.DateReceived
&& string.Join(", ", summary.Keywords) == dbMessage.Keywords)
{
folderMessage = new FolderMessage
{
FolderID = folderID,
UniqueId = summary.UniqueId,
Message = dbMessage,
};
await work.FolderMessages.AddAsync(folderMessage);
}
else if (dbMessage == null
|| summary.Flags != dbMessage.Flags
|| summary.InternalDate != dbMessage.DateReceived
|| string.Join(", ", summary.Keywords) != dbMessage.Keywords)
{
MimeMessage mailMessage = await GetMailMessageAsync(summary, mailFolder);
// save message to database
if (folderMsgID != null)
{
folderMessage = await work.DB.FolderMessages
.Where(fm => fm.ID == folderMsgID)
.Include(fm => fm.Message)
.ThenInclude(m => m.Participants)
.SingleOrDefaultAsync(_cancellationToken);
}
if (folderMessage == null)
{
folderMessage = new FolderMessage
{
FolderID = folderID,
UniqueId = summary.UniqueId,
Message = dbMessage ?? new Message
................................................................................
throw; // those need to fall through
}
await Con.WriteLineAsync();
await Con.WriteLineAsync(ex);
}
}
}
private async Task<MimeMessage> GetMailMessageAsync(IMessageSummary summary, IMailFolder mailFolder)
{
MimeMessage mailMessage;
try
{
mailMessage = await mailFolder.GetMessageAsync(summary.UniqueId, _cancellationToken);
}
catch (FormatException)
{
var mailEncoding = Encoding.GetEncoding("ISO-8859-1");
// Upon failure to parse the message, try to download the entire message stream
using (Stream mailStream = await mailFolder.GetStreamAsync(summary.UniqueId, 0, (int)summary.Size.Value, _cancellationToken))
using (StreamReader reader = new StreamReader(mailStream, mailEncoding, true))
{
using (var fs = new FileStream($"{summary.GMailMessageId}.eml", FileMode.Create, FileAccess.ReadWrite, FileShare.Read))
{
await mailStream.CopyToAsync(fs, _cancellationToken);
mailStream.Position = 0;
}
// Now, attempt to fix the mail message, by skipping lines until one doesn't start with a spacing character
var sbSource = new StringBuilder((int)mailStream.Length);
while (!reader.EndOfStream)
{
string line = await reader.ReadLineAsync();
if (line.Length == 0 || !char.IsWhiteSpace(line[0]))
{
sbSource.Append(line);
sbSource.Append("\r\n");
sbSource.Append(await reader.ReadToEndAsync());
}
}
using (var fixedStream = new MemoryStream((int)mailStream.Length))
{
await fixedStream.WriteAsync(reader.CurrentEncoding.GetBytes(sbSource.ToString()), _cancellationToken);
fixedStream.Position = 0;
var options = new ParserOptions
{
AddressParserComplianceMode = RfcComplianceMode.Loose,
AllowAddressesWithoutDomain = true,
AllowUnquotedCommasInAddresses = false,
CharsetEncoding = mailEncoding,
MaxAddressGroupDepth = 3,
ParameterComplianceMode = RfcComplianceMode.Loose,
RespectContentLength = true,
Rfc2047ComplianceMode = RfcComplianceMode.Loose,
};
mailMessage = await MimeMessage.LoadAsync(options, fixedStream, _cancellationToken);
}
}
}
return mailMessage;
}
public async Task ClearUnunsedObjectsAsync(bool vacuumDatabase = false)
{
using (var work = new UnitOfWork(_cancellationToken))
{
await Con.WriteLineAsync("Cleaning up database...", TraceLevel.Verbose);
................................................................................
}
}
}
private async Task PopulateMessageAsync(UnitOfWork work, Message targetMsg, MimeMessage sourceMsg,
IEnumerable<string> keywords, IEnumerable<string> labels)
{
targetMsg.RfcMessageID = sourceMsg.ResentMessageId ?? sourceMsg.MessageId; // TODO: reverse these?
targetMsg.Subject = sourceMsg.Subject;
targetMsg.Date = sourceMsg.Date;
targetMsg.From = new InternetAddressList(sourceMsg.From.Concat(sourceMsg.ResentFrom)).ToString();
targetMsg.To = new InternetAddressList(sourceMsg.To.Concat(sourceMsg.ResentTo)).ToString();
targetMsg.Cc = new InternetAddressList(sourceMsg.Cc.Concat(sourceMsg.ResentCc)).ToString();
targetMsg.Bcc = new InternetAddressList(sourceMsg.Bcc.Concat(sourceMsg.ResentBcc)).ToString();
targetMsg.Keywords = string.Join(", ", keywords);
................................................................................
GatherParticipants(ref participantList, sourceMsg.ResentSender, ParticipantField.ResentSender);
int order = 0;
foreach (var (field, mailAddress, mailName) in participantList)
{
string address = mailAddress == "" ? null : mailAddress;
string name = mailName == "" ? null : mailName;
if (name != null && name.Trim(' ', '\'', '"', '<', '>', '(', ')') == address)
name = null;
var msgParticipant = new MessageParticipant
{
Message = targetMsg,
Field = field,
Order = ++order,
................................................................................
}
else
{
var participant = new Participant
{
Address = address,
Name = name,
};
await work.Participants.AddAsync(participant);
// We only know the IDs after saving the entities
await work.SaveChangesAsync();
_participants.TryAdd(key, participant.ID);
msgParticipant.ParticipantID = participant.ID;
}
await work.DB.MessageParticipants.AddAsync(msgParticipant, _cancellationToken);
}
await work.SaveChangesAsync();
} // PopulateParticipantsAsync
private async Task PopulateKeywordsAsync(UnitOfWork work, Message targetMsg,
IEnumerable<string> keywords, IEnumerable<string> labels)
{
// Store the keywords separately, and link them to this message
var allKeywords = keywords.Select(k => (Name: k, IsLabel: false))
.Concat(labels.Select(l => (Name: l, IsLabel: true)));
var triplets = allKeywords.Select(mailKeyword => (Name: mailKeyword.Name,
IsLabel: mailKeyword.IsLabel,
ID: _keywords.GetValueOrDefault(mailKeyword, 0)));
var keywordSets = from triplet in triplets
join dbMsgKeyword in work.DB.MessageKeywords.Where(mk => mk.Message == targetMsg)
on triplet.ID equals dbMsgKeyword.KeywordID
into msgKeywordSet
from dbMsgKeyword in msgKeywordSet.DefaultIfEmpty()
select (triplet.Name,
triplet.IsLabel,
msgKeywordID: dbMsgKeyword == null ? (long?)null : dbMsgKeyword.ID,
keywordID: triplet.ID);
int index = 0;
foreach ((string mailKeyword, bool isLabel, long? msgKeywordID, long kwID) in keywordSets)
{
index++;
if (msgKeywordID == null)
{
long keywordID = kwID;
if (keywordID == 0)
{
var keyword = new Keyword
{
Name = mailKeyword,
IsLabel = isLabel
};
await work.Keywords.AddAsync(keyword);
await work.SaveChangesAsync();
keywordID = keyword.ID;
_keywords.Add((mailKeyword, isLabel), keywordID);
}
await work.DB.MessageKeywords.AddAsync(new MessageKeyword
{
Message = targetMsg,
Order = index,
KeywordID = keywordID,
}, _cancellationToken);
}
}
}
/// <summary>
/// Store any references between messages.
................................................................................
var dbMessageRefs = await work.MessageReferences
.GetDictionaryAsync(mr => mr.Message == targetMsg,
mr => mr.ReferencedRfcMessageID,
mr => mr);
var dbReferencedMessageIDs = work.Messages
.GetLookup(m => sourceReferences.Contains(m.RfcMessageID),
m => m.RfcMessageID,
m => m?.ID); // make this a nullable long, so FirstOrDefault will return a null.
int index = 0;
foreach (string mailRef in sourceReferences)
{
index++;
MessageReference dbReference = dbMessageRefs.GetValueOrDefault(mailRef, null);
long? dbMessageID = null;
if (dbReferencedMessageIDs.Contains(mailRef))
|
Changes to Repositories/FolderMessagesRepository.cs.
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using System.Linq; using System.Threading; using System.Threading.Tasks; using MailJanitor.Models; using Microsoft.EntityFrameworkCore; namespace MailJanitor.Repositories ................................................................................ public Task<uint> GetMaxUIDAsync(Folder folder) { return _db.FolderMessages .Where(fm => fm.Folder == folder) .DefaultIfEmpty() .MaxAsync(fm => fm == null ? 0 : fm.UID, _cancellationToken); } } } |
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using System.Collections.Generic; using System.Linq; using System.Threading; using System.Threading.Tasks; using MailJanitor.Models; using Microsoft.EntityFrameworkCore; namespace MailJanitor.Repositories ................................................................................ public Task<uint> GetMaxUIDAsync(Folder folder) { return _db.FolderMessages .Where(fm => fm.Folder == folder) .DefaultIfEmpty() .MaxAsync(fm => fm == null ? 0 : fm.UID, _cancellationToken); } public async Task<Dictionary<ulong, (long? folderMsgID, long? messageID)>> GetIDsByGlobalIDAsync(long dbFolderID, IEnumerable<ulong> globalIDs) { return await(from dbMessage in _db.Messages where globalIDs.Contains(dbMessage.GlobalID.Value) join folderMsg in _set.Where(folderMsg => folderMsg.FolderID == dbFolderID) on dbMessage.ID equals folderMsg.MessageID into folderMsgs from folderMsg in folderMsgs.DefaultIfEmpty() select new { globalID = dbMessage.GlobalID.Value, folderMsgID = folderMsg == null ? null : (long?)folderMsg.ID, messageID = dbMessage == null ? null : (long?)dbMessage.ID, }) .ToDictionaryAsync(idSet => idSet.globalID, idSet => (idSet.folderMsgID, idSet.messageID), _cancellationToken); } } } |
Changes to Repositories/Repository.cs.
190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 |
{
if (typeof(long).IsAssignableFrom(typeof(TKey)))
{
IEntityType entityType = _db.Model.FindEntityType(typeof(T));
IReadOnlyList<IProperty> keyProperties = entityType.FindPrimaryKey().Properties;
if (keyProperties.Count == 1)
{
IProperty key = keyProperties.First();
if (typeof(long).IsAssignableFrom(key.ClrType))
{
// Ensure we've got Int64s, and nothing else
var numericIDs = ids.Select(id => Convert.ToInt64(id));
// Prepare the SQL statement
string tableName = entityType.Relational().TableName;
string keyColumn = key.Relational().ColumnName;
string sql = "DELETE FROM [" + tableName + "] WHERE [" + keyColumn + "] IN (" + string.Join(", ", numericIDs) + ")";
#pragma warning disable EF1000 // SQL command has been checked for SQL injection vectors, and found safe.
int numDeleted = _db.Database.ExecuteSqlCommand(sql);
#pragma warning restore EF1000
// Detach all corresponding entries
var entries = _db.ChangeTracker.Entries()
.Where(e => e.Metadata == entityType)
.Where(e => numericIDs.Contains((long)e.Property(key.Name).CurrentValue));
foreach (var entry in entries)
{
entry.State = EntityState.Detached;
}
return numDeleted;
}
}
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{
if (typeof(long).IsAssignableFrom(typeof(TKey)))
{
IEntityType entityType = _db.Model.FindEntityType(typeof(T));
IReadOnlyList<IProperty> keyProperties = entityType.FindPrimaryKey().Properties;
if (keyProperties.Count == 1)
{
IProperty key = keyProperties[0];
if (typeof(long).IsAssignableFrom(key.ClrType))
{
// Ensure we've got Int64s, and nothing else
var numericIDs = ids.Select(id => Convert.ToInt64(id));
// Prepare the SQL statement
string tableName = entityType.Relational().TableName;
string keyColumn = key.Relational().ColumnName;
string sql = $"DELETE FROM [{tableName}] WHERE [{keyColumn}] IN ({string.Join(", ", numericIDs)})";
#pragma warning disable EF1000 // SQL command has been checked for SQL injection vectors, and found safe.
int numDeleted = _db.Database.ExecuteSqlCommand(sql);
#pragma warning restore EF1000
// Detach all corresponding entries
var entries = _db.ChangeTracker.Entries()
.Where(e => e.Metadata == entityType)
.Where(e => ids.Contains((TKey)e.Property(key.Name).CurrentValue));
foreach (var entry in entries)
{
entry.State = EntityState.Detached;
}
return numDeleted;
}
}
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