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 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);
}
public static void ScheduleNonQuery <TEntity>(this IEntitySession session,
IQueryable query, LinqCommandType commandType,
CommandSchedule schedule = CommandSchedule.TransactionEnd)
{
var entQuery = query as EntityQuery;
var model = session.Context.App.Model;
Util.Check(entQuery != null, "query parameter should an EntityQuery.");
var prov = entQuery.Provider as EntityQueryProvider;
var targetEnt = model.GetEntityInfo(typeof(TEntity));
Util.Check(targetEnt != null, "Generic parameter {0} is not an entity registered in the Model.", typeof(TEntity));
var command = new LinqCommand(entQuery, commandType, LinqCommandKind.DynamicSql, targetEnt);
LinqCommandAnalyzer.Analyze(model, command);
command.EvaluateLocalValues((EntitySession)session);
var scheduledCommand = new ScheduledLinqCommand()
{
Command = command, Schedule = schedule
};
var entSession = (EntitySession)session;
entSession.ScheduledCommands.Add(scheduledCommand);
}
private void AddScheduledCommands(IList <ScheduledLinqCommand> commands)
{
if (commands.Count == 0)
{
return;
}
var entModel = _db.DbModel.EntityApp.Model;
var engine = new Vita.Data.Linq.Translation.LinqEngine(_db.DbModel);
object[] fmtArgs = new object[100];
//specifics of formatting stored proc call - the first 2 args are always two braces
// Braces in string literals are escaped and are represented as '{0}' and '{1}'
fmtArgs[0] = "{";
fmtArgs[1] = "}";
foreach (var schCmd in commands)
{
CheckCurrentCommand();
var dbCmd = _currentCommand.DbCommand;
var linqCmd = schCmd.Command;
LinqCommandAnalyzer.Analyze(entModel, linqCmd);
var transCmd = engine.Translate(linqCmd);
for (int prmIndex = 0; prmIndex < transCmd.Parameters.Count; prmIndex++)
{
var linqParam = transCmd.Parameters[prmIndex];
var value = linqParam.ReadValue(linqCmd.ParameterValues) ?? DBNull.Value;
var dbParam = dbCmd.CreateParameter();
_db.DbModel.LinqSqlProvider.SetDbParameterValue(dbParam, linqParam.Type, value);
var globalParamIndex = dbCmd.Parameters.Count;
dbParam.ParameterName = _driver.DynamicSqlParameterPrefix + "P" + globalParamIndex;
fmtArgs[prmIndex + 2] = dbParam.ParameterName;
dbCmd.Parameters.Add(dbParam);
}
var sql = string.Format(transCmd.BatchSqlTemplate, fmtArgs);
_sqlBuilder.AppendLine(sql);
}//foreach schCmd
}
