private static string GetParametersToken(EntityCommand entityCommand)
{
if (entityCommand.Parameters == null || entityCommand.Parameters.Count == 0)
{
return("@@0");
}
Dictionary <string, TypeUsage> parameterTypeUsage = entityCommand.GetParameterTypeUsage();
if (1 == parameterTypeUsage.Count)
{
return("@@1:" + entityCommand.Parameters[0].ParameterName + ":" + EntityClientCacheKey.GetTypeUsageToken(parameterTypeUsage[entityCommand.Parameters[0].ParameterName]));
}
StringBuilder stringBuilder = new StringBuilder(entityCommand.Parameters.Count * 20);
stringBuilder.Append("@@");
stringBuilder.Append(entityCommand.Parameters.Count);
stringBuilder.Append(":");
string str = "";
foreach (KeyValuePair <string, TypeUsage> keyValuePair in parameterTypeUsage)
{
stringBuilder.Append(str);
stringBuilder.Append(keyValuePair.Key);
stringBuilder.Append(":");
stringBuilder.Append(EntityClientCacheKey.GetTypeUsageToken(keyValuePair.Value));
str = ";";
}
return(stringBuilder.ToString());
}
internal EntityClientCacheKey(EntityCommand entityCommand)
{
this._commandType = entityCommand.CommandType;
this._eSqlStatement = entityCommand.CommandText;
this._parametersToken = EntityClientCacheKey.GetParametersToken(entityCommand);
this._parameterCount = entityCommand.Parameters.Count;
this._hashCode = this._commandType.GetHashCode() ^ this._eSqlStatement.GetHashCode() ^ this._parametersToken.GetHashCode();
}
public override bool Equals(object otherObject)
{
if (typeof(EntityClientCacheKey) != otherObject.GetType())
{
return(false);
}
EntityClientCacheKey entityClientCacheKey = (EntityClientCacheKey)otherObject;
if (this._commandType == entityClientCacheKey._commandType && this._parameterCount == entityClientCacheKey._parameterCount && this.Equals(entityClientCacheKey._eSqlStatement, this._eSqlStatement))
{
return(this.Equals(entityClientCacheKey._parametersToken, this._parametersToken));
}
return(false);
}
// <summary>
// Gets an entitycommanddefinition from cache if a match is found for the given cache key.
// </summary>
// <param name="entityCommandDefinition"> out param. returns the entitycommanddefinition for a given cache key </param>
// <returns> true if a match is found in cache, false otherwise </returns>
private bool TryGetEntityCommandDefinitionFromQueryCache(out EntityCommandDefinition entityCommandDefinition)
{
Debug.Assert(null != _connection, "Connection must not be null at this point");
entityCommandDefinition = null;
// if EnableQueryCaching is false, then just return to force the CommandDefinition to be created
if (!_enableQueryPlanCaching
|| string.IsNullOrEmpty(_esqlCommandText))
{
return false;
}
// Create cache key
var queryCacheKey = new EntityClientCacheKey(this);
// Try cache lookup
var queryCacheManager = _connection.GetMetadataWorkspace().GetQueryCacheManager();
Debug.Assert(null != queryCacheManager, "QuerycacheManager instance cannot be null");
if (!queryCacheManager.TryCacheLookup(queryCacheKey, out entityCommandDefinition))
{
// if not, construct the command definition using no special options;
entityCommandDefinition = CreateCommandDefinition();
// add to the cache
QueryCacheEntry outQueryCacheEntry = null;
if (queryCacheManager.TryLookupAndAdd(new QueryCacheEntry(queryCacheKey, entityCommandDefinition), out outQueryCacheEntry))
{
entityCommandDefinition = (EntityCommandDefinition)outQueryCacheEntry.GetTarget();
}
}
Debug.Assert(null != entityCommandDefinition, "out entityCommandDefinition must not be null");
return true;
}
