public object ExecuteLinqSelect(LinqCommand linqCommand, EntitySession session, DataConnection conn)
{
var translCmd = GetTranslateLinqCommand(linqCommand);
//Locks require ongoing transaction
object result;
var dbCommand = CreateLinqDbCommand(conn, linqCommand, translCmd);
IList resultList = translCmd.ResultListCreator();
ExecuteDbCommand(dbCommand, conn, DbExecutionType.Reader, reader => {
while (reader.Read())
{
var row = translCmd.ObjectMaterializer(reader, session);
//row might be null if authorization filtered it out or if it is empty value set from outer join
if (row != null)
{
resultList.Add(row);
}
}
return(resultList.Count);
});
//Post processor is extra selection op from the query (Fist,Single,Last)
var postProcessor = translCmd.ResultsPostProcessor;
if (postProcessor != null)
{
result = postProcessor.ProcessRows(resultList);
}
else
{
result = resultList;
}
return(result);
}
private EntityCacheQuery GetCacheQuery(LinqCommand command)
{
// Try to lookup in query cache
var cacheQuery = _queryCache.Lookup(command.Info.CacheKey);
if (cacheQuery != null)
{
return(cacheQuery);
}
// Build query and save it in entity cache
//Preprocess query to get all entity types used
LinqCommandPreprocessor.PreprocessCommand(_app.Model, command);
foreach (var ent in command.Info.Entities)
{
if (ent.CacheType != CacheType.FullSet)
{
return(null); //cannot use cache for this query
}
}
//Rewrite query for cache
// string case mode is either case insensitive when query option is set (search queries are case insensitive)
// or set to default value for cache (which is the same as DB-s default case value)
var queryCaseMode = command.Info.Options.IsSet(QueryOptions.ForceIgnoreCase) ? StringCaseMode.CaseInsensitive : _caseMode;
var rewriter = new CacheQueryRewriter(_app.Model, queryCaseMode);
var cacheFunc = rewriter.Rewrite(command.Info.Lambda);
cacheQuery = new EntityCacheQuery(cacheFunc, command.Info.Lambda.ToString());
_queryCache.Add(command.Info.CacheKey, cacheQuery);
return(cacheQuery);
}
public virtual bool CanDeleteRecord(EntityRecord record, out Type[] blockingEntities)
{
Util.Check(record != null, "CanDeleteRecord: record parameter may not be null.");
blockingEntities = null;
var entInfo = record.EntityInfo;
var blockingTypeSet = new HashSet <Type>();
//check all external ref members
foreach (var refMember in entInfo.IncomingReferences)
{
// if it is cascading delete, this member is not a problem
if (refMember.Flags.IsSet(EntityMemberFlags.CascadeDelete))
{
continue;
}
var countCmdInfo = refMember.ReferenceInfo.CountCommand;
var countCmd = new LinqCommand(countCmdInfo, refMember.ReferenceInfo.ToKey.Entity, new object[] { this, record.EntityInstance });
var count = (int)ExecuteLinqCommand(countCmd);
if (count > 0)
{
blockingTypeSet.Add(refMember.Entity.EntityType);
}
}
if (blockingTypeSet.Count == 0)
{
return(true);
}
blockingEntities = blockingTypeSet.ToArray();
return(false);
}
public virtual object ExecuteLinqCommand(LinqCommand command, bool withIncludes = true)
{
try {
var result = _dataSource.ExecuteLinqCommand(this, command);
switch (command.Operation)
{
case LinqOperation.Select:
Context.App.AppEvents.OnExecutedSelect(this, command);
if (withIncludes && (command.Includes?.Count > 0 || Context.HasIncludes()))
{
IncludeProcessor.RunIncludeQueries(command, result);
}
//Util.Throw("Include processor disabled.");
break;
default:
Context.App.AppEvents.OnExecutedNonQuery(this, command);
NextTransactionId = Guid.NewGuid();
break;
}
return(result);
} catch (Exception ex) {
ex.AddValue("entity-command", command + string.Empty);
ex.AddValue("parameters", command.ParamValues);
throw;
}
}
public TranslatedLinqCommand Translate(LinqCommand command)
{
if (command.Info == null)
{
LinqCommandAnalyzer.Analyze(_dbModel.EntityApp.Model, command);
}
try {
switch (command.CommandType)
{
case LinqCommandType.Select:
return(TranslateSelect(command));
case LinqCommandType.Update:
case LinqCommandType.Delete:
case LinqCommandType.Insert:
return(TranslateNonQuery(command));
default:
ThrowTranslationFailed(command, "Unsupported LINQ command type.");
return(null);
}
} catch (LinqTranslationException) {
throw; // if it is alread Linq translation exception, pass it up.
} catch (Exception ex) {
var message = "Linq to SQL translation failed: " + ex.Message +
"\r\nPossibly facilities you are trying to use are not supported. " +
"\r\nTry to reformulate/simplify the query. Hint: do not use c# functions/methods inside query directly. ";
throw new LinqTranslationException(message, command, ex);
}
}
public object ExecuteLinqCommand(EntitySession session, LinqCommand command)
{
object result;
if (command.CommandType == LinqCommandType.Select && Cache != null && Cache.TryExecuteLinqQuery(session, command, out result))
{
return(result);
}
result = Database.ExecuteLinqCommand(session, command);
//If we are returning entities, cache them
if (command.CommandType == LinqCommandType.Select)
{
var recs = result as IList <EntityRecord>;
if (Cache != null && recs != null)
{
Cache.CacheRecords(recs); //adds to sparse cache
}
}
else
{
// Update/Insert/Delete statemetns
if (Cache != null && command.TargetEntity.CacheType != CacheType.None)
{
Cache.Invalidate();
}
}
return(result);
}
internal void OnExecutedNonQuery(EntitySession session, LinqCommand command)
{
if (ExecutedNonQuery != null)
{
ExecutedNonQuery(session, new LinqCommandEventArgs(session, command));
}
}
} //method
private static void ThrowTranslationFailed(LinqCommand command, string message, params object[] args)
{
var msg = StringHelper.SafeFormat(message, args) + "\r\n Query:" + command.ToString();
var exc = new LinqTranslationException(msg, command);
throw exc;
}
public bool TryExecuteDynamicQuery(EntitySession session, LinqCommand command, out object result)
{
result = null;
if (!CheckFullSetCacheCurrent(session))
{
return(false);
}
var cmdInfo = command.Info;
//try getting previously compiled version or compile it
var cacheQuery = GetCacheQuery(command);
if (cacheQuery == null)
{
return(false);
}
var start = _timeService.ElapsedMilliseconds;
result = cacheQuery.CacheFunc(session, this, command.ParameterValues);
var end = _timeService.ElapsedMilliseconds;
var logEntry = new CacheQueryLogEntry(session.Context, cacheQuery.LogString, command.ParameterValues,
_timeService.UtcNow, end - start, GetRowCount(result));
session.AddLogEntry(logEntry);
session.Context.EntityCacheVersion = CurrentVersion;
return(true);
}
private object ExecuteLinqNonQuery(LinqCommand linqCommand, EntitySession session, DataConnection connection)
{
var translCmd = GetTranslateLinqCommand(linqCommand);
var dbCommand = CreateLinqDbCommand(connection, linqCommand, translCmd);
var result = ExecuteDbCommand(dbCommand, connection, DbExecutionType.NonQuery);
return(result);
}
public LinqTranslationException(string message, LinqCommand command, Exception inner = null) : base(message, inner)
{
Command = command;
if (Command != null)
{
this.Data["LinqExpression"] = Command.Lambda?.ToString();
}
}
public ViewDefinition(EntityModule module, Type entityType, EntityQuery query, DbViewOptions options, string name)
{
Module = module;
EntityType = entityType;
Options = options;
Name = name;
Command = new LinqCommand(query, LinqCommandType.Select, LinqCommandKind.View, null);
}
public TranslationContext(TranslationContext source)
{
this.DbModel = source.DbModel;
this.Command = source.Command;
this.ExternalValues = source.ExternalValues;
this.SelectExpressions = source.SelectExpressions;
this.LambdaParameters = source.LambdaParameters;
this._currentScopeIndex = source._currentScopeIndex;
}
public TranslationContext(DbModel dbModel, LinqCommand command)
{
DbModel = dbModel;
Command = command;
SelectExpressions = new List <SelectExpression>();
_currentScopeIndex = SelectExpressions.Count;
SelectExpressions.Add(new SelectExpression(Command));
ExternalValues = new List <ExternalValueExpression>();
LambdaParameters = new Dictionary <string, Expression>();
}
// Helper methods
private SqlStatement GetCachedLinqSql(LinqCommand command)
{
if (command.Options.IsSet(QueryOptions.NoQueryCache))
{
return(null);
}
Util.Check(!string.IsNullOrEmpty(command.SqlCacheKey), "Fatal: SQL cache key is not set for LINQ query: {0}", command);
var sql = _sqlCache.Lookup(command.SqlCacheKey);
return(sql);
}
private object ExecuteLinqNonQuery(EntitySession session, LinqCommand command, DataConnection conn)
{
var sql = SqlFactory.GetLinqSql(command);
var fmtOptions = command.Options.IsSet(QueryOptions.NoParameters) ?
SqlGenMode.NoParameters : SqlGenMode.PreferParam;
var cmdBuilder = new DataCommandBuilder(this._driver);
cmdBuilder.AddLinqStatement(sql, command.ParamValues);
var dataCmd = cmdBuilder.CreateCommand(conn, DbExecutionType.NonQuery, sql.ResultProcessor);
ExecuteDataCommand(dataCmd);
return(dataCmd.ProcessedResult ?? dataCmd.Result);
}
public object ExecuteLinqSelect(EntitySession session, LinqCommand command, DataConnection conn)
{
var sql = SqlFactory.GetLinqSql(command);
var genMode = command.Options.IsSet(QueryOptions.NoParameters) ?
SqlGenMode.NoParameters : SqlGenMode.PreferParam;
var cmdBuilder = new DataCommandBuilder(this._driver, batchMode: false, mode: genMode);
cmdBuilder.AddLinqStatement(sql, command.ParamValues);
var dataCmd = cmdBuilder.CreateCommand(conn, DbExecutionType.Reader, sql.ResultProcessor);
ExecuteDataCommand(dataCmd);
return(dataCmd.ProcessedResult);
}
public bool TryExecuteLinqQuery(EntitySession session, LinqCommand command, out object result)
{
result = null;
if (!Settings.CacheEnabled || session.CacheDisabled || command.Info.Options.IsSet(QueryOptions.NoEntityCache))
{
return(false);
}
if (_fullSetCache.TryExecuteDynamicQuery(session, command, out result))
{
return(true);
}
return(false);
}
/// <summary>Executes non-query operation of specified type based on LINQ query. See concrete methods for specific command types
/// for more information and requirements to base query in each case. </summary>
/// <typeparam name="TEntity">Entity type.</typeparam>
/// <param name="query">Base query.</param>
/// <param name="commandType">Command type (insert, update or delete).</param>
/// <returns></returns>
public static int ExecuteNonQuery <TEntity>(this IQueryable query, LinqCommandType commandType)
{
var entQuery = query as EntityQuery;
var prov = entQuery.Provider as EntityQueryProvider;
var session = prov.Session;
Util.Check(session != null, "Cannot execute query not associated with active entity session.");
var targetEnt = session.Context.App.Model.GetEntityInfo(typeof(TEntity));
var command = new LinqCommand(entQuery, commandType, LinqCommandKind.DynamicSql, targetEnt);
var objResult = session.ExecuteLinqCommand(command);
return((int)objResult);
}
//TODO: test and fix the following:
// Includes - when including child list, the list initialized only if it's not empty;
// if empty, it remains uninitialized, and on touch fwk fires select query with 0 results
// Initially found in some external solution, seemed to be broken, but now maybe working. Needs to be retested!
internal static void RunIncludeQueries(LinqCommand command, object mainQueryResult)
{
// initial checks if there's anything to run
if (mainQueryResult == null)
{
return;
}
var session = command.Session;
var allIncludes = session.Context.GetMergedIncludes(command.Includes);
if (allIncludes == null || allIncludes.Count == 0)
{
return;
}
var resultShape = GetResultShape(session.Context.App.Model, mainQueryResult.GetType());
if (resultShape == QueryResultShape.Object)
{
return;
}
// Get records from query result
var records = new List <EntityRecord>();
switch (resultShape)
{
case QueryResultShape.Entity:
records.Add(EntityHelper.GetRecord(mainQueryResult));
break;
case QueryResultShape.EntityList:
var list = mainQueryResult as IList;
if (list.Count == 0)
{
return;
}
foreach (var ent in list)
{
records.Add(EntityHelper.GetRecord(ent));
}
break;
}//switch;
// actually run the includes
var entityType = records[0].EntityInfo.EntityType;
var helper = new IncludeProcessor(session, allIncludes);
session.LogMessage("------- Running include queries ----------");
helper.RunIncludeQueries(entityType, records);
session.LogMessage("------- Completed include queries ----------");
}
private TranslatedLinqCommand TranslateSelect(LinqCommand command)
{
LinqCommandPreprocessor.PreprocessCommand(_dbModel.EntityApp.Model, command);
var context = new TranslationContext(_dbModel, command);
var cmdInfo = command.Info;
// convert lambda params into an initial set of ExternalValueExpression objects;
foreach (var prm in cmdInfo.Lambda.Parameters)
{
var inpParam = new ExternalValueExpression(prm);
context.ExternalValues.Add(inpParam);
}
//Analyze/transform query expression
var exprChain = ExpressionChain.Build(cmdInfo.Lambda.Body);
var selectExpr = BuildSelectExpression(exprChain, context);
// Analyze external values (parameters?), create DbParameters
var commandParams = BuildParameters(command, context);
// If there's at least one parameter that must be converted to literal (ex: value list), we cannot cache the query
bool canCache = !context.ExternalValues.Any(v => v.SqlUse == ExternalValueSqlUse.Literal);
if (!canCache)
{
command.Info.Flags |= LinqCommandFlags.NoQueryCache;
}
//Build SQL, compile object materializer
var sqlBuilder = new SqlBuilder(_dbModel);
var sqlStatement = sqlBuilder.BuildSelect(selectExpr);
// Parameters are represented as {2}, {3}, etc.
// Braces in string literals are escaped and are represented as '{0}' and '{1}'
var sqlTemplate = sqlStatement.ToString();
var sql = FormatSql(sqlTemplate, commandParams);
var objMaterializer = CompileObjectMaterializer(context);
var outType = context.CurrentSelect.Reader.Body.Type;
var resultListCreator = ReflectionHelper.GetCompiledGenericListCreator(outType);
//check if we need to create implicit result set processor
if (selectExpr.ResultsProcessor == null)
{
var returnsResultSet = typeof(IQueryable).IsAssignableFrom(cmdInfo.Lambda.Body.Type);
if (!returnsResultSet)
{
selectExpr.ResultsProcessor = QueryResultsProcessor.CreateFirstSingleLast("First", outType);
}
}
var sqlQuery = new TranslatedLinqCommand(sqlTemplate, sql, commandParams, command.Info.Flags,
objMaterializer, selectExpr.ResultsProcessor, resultListCreator);
return(sqlQuery);
}
public NonQueryLinqCommandData(LinqCommand baseLinqCommand, SelectExpression baseSelect, TableExpression targetTable) {
BaseLinqCommand = baseLinqCommand;
BaseSelect = baseSelect;
TargetTable = targetTable;
switch(BaseLinqCommand.CommandType) {
case LinqCommandType.Insert: UseSimpleCommand = false; break;
default:
var allTables = BaseSelect.Tables;
var usesSkipTakeOrderBy = BaseSelect.Offset != null || BaseSelect.Limit != null;
UseSimpleCommand = allTables.Count == 1 && allTables[0].TableInfo == targetTable.TableInfo && !usesSkipTakeOrderBy;
break;
}
}
public virtual bool IsSqlTier(Expression expression, LinqCommand command)
{
var sqlExpr = expression as SqlExpression;
if (sqlExpr != null)
{
switch (sqlExpr.SqlNodeType)
{
case SqlExpressionType.Select:
case SqlExpressionType.Column:
case SqlExpressionType.Table:
case SqlExpressionType.ExternalValue:
case SqlExpressionType.SqlFunction:
return(true);
case SqlExpressionType.Group:
case SqlExpressionType.DerivedTable:
return(false);
default:
return(true);
}
}
switch (expression.NodeType)
{
case ExpressionType.ArrayLength:
case ExpressionType.ArrayIndex:
case ExpressionType.Call:
case ExpressionType.Convert:
case ExpressionType.ConvertChecked:
case ExpressionType.Invoke:
case ExpressionType.Lambda:
case ExpressionType.ListInit:
case ExpressionType.MemberAccess:
case ExpressionType.MemberInit:
case ExpressionType.New:
case ExpressionType.NewArrayInit:
case ExpressionType.NewArrayBounds:
case ExpressionType.Parameter:
case ExpressionType.SubtractChecked:
case ExpressionType.TypeAs:
case ExpressionType.TypeIs:
return(false);
default:
return(true);
}
}
public object ExecuteLinqCommand(EntitySession session, LinqCommand command)
{
object result = null;
if (Cache != null && command.Operation == LinqOperation.Select && Cache.TryExecuteSelect(session, command, out result))
{
return(result);
}
result = Database.ExecuteLinqCommand(session, command);
//If we are returning entities, cache them; if updating - invalidate
if (Cache != null)
{
Cache.OnCommandExecuted(session, command, result);
}
return(result);
}
public object ExecuteLinqCommand(EntitySession session, LinqCommand command)
{
var conn = GetLinqCommandConnection(session, command.Info.Flags);
try {
object result = command.CommandType == LinqCommandType.Select ?
ExecuteLinqSelect(command, session, conn) :
ExecuteLinqNonQuery(command, session, conn);
ReleaseConnection(conn);
return(result);
} catch (Exception dex) {
ReleaseConnection(conn, inError: true);
dex.AddValue(DataAccessException.KeyLinqQuery, command.QueryExpression);
throw;
}
}
private IDbCommand CreateLinqDbCommand(DataConnection connection, LinqCommand linqCommand, TranslatedLinqCommand translatedCommand)
{
var cmd = connection.DbConnection.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = translatedCommand.Sql;
foreach (var qParam in translatedCommand.Parameters)
{
var value = qParam.ReadValue(linqCommand.ParameterValues) ?? DBNull.Value;
var dbParam = cmd.CreateParameter(); //DbModel.Driver.AddParameter(cmd, //
dbParam.ParameterName = qParam.Name;
//Value and parameter may need some tweaking, depending on server type
DbModel.LinqSqlProvider.SetDbParameterValue(dbParam, qParam.Type, value);
cmd.Parameters.Add(dbParam);
}
return(cmd);
}
public SqlStatement GetLinqSql(LinqCommand command)
{
// lookup in cache
var stmt = GetCachedLinqSql(command);
if (stmt != null)
{
return(stmt);
}
// not in cache - translate
stmt = _linqEngine.Translate(command);
_driver.SqlDialect.ReviewSqlStatement(stmt, command);
if (!command.Options.IsSet(QueryOptions.NoQueryCache))
{
_sqlCache.Add(command.SqlCacheKey, stmt);
}
return(stmt);
}
// Note: Earlier implementation was doing authorization check in Attach method - but this does not work well, this is too early
// Instead, checking authorization in ExecuteQuery
public override object ExecuteLinqCommand(LinqCommand command)
{
var result = base.ExecuteLinqCommand(command);
if (result == null)
{
return(null);
}
if (command.CommandType != LinqCommandType.Select)
{
return(result);
}
switch (command.Info.ResultShape)
{
case QueryResultShape.Entity:
var rec = EntityHelper.GetRecord(result);
if (!CheckRecordAccess(rec, AccessType.Peek))
{
return(null);
}
return(result);
case QueryResultShape.EntityList:
// Note that result list is a typed List<TEntity>; we need to filter it. To avoid trouble of creating another typed list,
// we filter elements 'in place', iterating it in reverse order
var list = result as System.Collections.IList;
for (int i = list.Count - 1; i >= 0; i--)
{
var ent = list[i];
var rec2 = EntityHelper.GetRecord(ent);
if (rec2 == null || !CheckRecordAccess(rec2, AccessType.Peek))
{
list.RemoveAt(i);
}
}
return(result);
default:
// if it is auto type or list of auto types, we return it as-is. If auto-object has Entities in properties, they will be there,
// even if authorization does not allow the user to access them;
// but as soon as the code tries to access properties of these entities, authorization will throw AccessDenied
return(result);
}
}
public object ExecuteLinqCommand(EntitySession session, LinqCommand command)
{
var conn = GetConnectionWithLock(session, command.LockType);
try {
object result;
if (command.Operation == LinqOperation.Select)
{
result = ExecuteLinqSelect(session, command, conn);
}
else
{
result = ExecuteLinqNonQuery(session, command, conn);
}
ReleaseConnection(conn);
return(result);
} catch (Exception dex) {
ReleaseConnection(conn, inError: true);
dex.AddValue(DataAccessException.KeyLinqQuery, command.ToString());
throw;
}
}
public virtual object ExecuteLinqCommand(LinqCommand command)
{
this.LastLinqCommand = command;
var cmdInfo = LinqCommandAnalyzer.Analyze(Context.App.Model, command);
if (command.Kind == LinqCommandKind.DynamicSql)
{
command.EvaluateLocalValues(this);
}
//account for LinkedApps - get any entity involved in query and get the app it is registered in
EntityApp targetApp = this.Context.App;
if (cmdInfo.EntityTypes.Count > 0)
{
var someType = cmdInfo.EntityTypes[0];
var someEntInfo = GetEntityInfo(someType);
Util.Check(someEntInfo != null, "Type {0} is not a registered entity, cannot execute the query.", someType);
targetApp = someEntInfo.Module.App;
}
var ds = targetApp.DataAccess.GetDataSource(this.Context);
var result = ds.ExecuteLinqCommand(this, command);
//fire events
switch (command.CommandType)
{
case LinqCommandType.Select:
_appEvents.OnExecutedQuery(this, command); break;
default:
_appEvents.OnExecutedNonQuery(this, command);
NextTransactionId = Guid.NewGuid();
break;
}
if (command.Info.Includes.Count > 0 || Context.HasIncludes())
{
IncludeQueryHelper.RunIncludeQueries(this, command, result);
}
return(result);
}
