/// <summary>
///
/// </summary>
/// <param name="queryString"></param>
/// <param name="session"></param>
public AbstractQueryImpl( string queryString, ISessionImplementor session )
{
this.session = session;
this.queryString = queryString;
selection = new RowSelection();
InitParameterBookKeeping();
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues,
IDictionary<string, LockMode> lockModes, RowSelection rowSelection, bool cacheable,
string cacheRegion, string comment, bool isLookupByNaturalKey, IResultTransformer transformer)
: this(
positionalParameterTypes, positionalParameterValues, null, lockModes, rowSelection, false, cacheable, cacheRegion,
comment, null, transformer)
{
NaturalKeyLookup = isLookupByNaturalKey;
}
public QueryParameters(IDictionary<string, TypedValue> namedParameters, IDictionary<string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized,
bool readOnly, bool cacheable, string cacheRegion, string comment, bool isLookupByNaturalKey, IResultTransformer transformer)
: this(
ArrayHelper.EmptyTypeArray, ArrayHelper.EmptyObjectArray, namedParameters, lockModes, rowSelection, isReadOnlyInitialized, readOnly, cacheable, cacheRegion, comment, null,
transformer)
{
// used by CriteriaTranslator
NaturalKeyLookup = isLookupByNaturalKey;
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary<string, TypedValue> namedParameters,
IDictionary<string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized, bool readOnly, bool cacheable, string cacheRegion,
string comment, object[] collectionKeys, object optionalObject, string optionalEntityName, object optionalId, IResultTransformer transformer)
: this(
positionalParameterTypes, positionalParameterValues, namedParameters, lockModes, rowSelection, isReadOnlyInitialized, readOnly, cacheable, cacheRegion, comment, collectionKeys,
transformer)
{
OptionalEntityName = optionalEntityName;
OptionalId = optionalId;
OptionalObject = optionalObject;
}
/// <summary>
/// Create an <see cref="IEnumerable"/> wrapper over an <see cref="IDataReader"/>.
/// </summary>
/// <param name="reader">The <see cref="IDataReader"/> to enumerate over.</param>
/// <param name="cmd">The <see cref="IDbCommand"/> used to create the <see cref="IDataReader"/>.</param>
/// <param name="sess">The <see cref="ISession"/> to use to load objects.</param>
/// <param name="types">The <see cref="IType"/>s contained in the <see cref="IDataReader"/>.</param>
/// <param name="columnNames">The names of the columns in the <see cref="IDataReader"/>.</param>
/// <param name="selection">The <see cref="RowSelection"/> that should be applied to the <see cref="IDataReader"/>.</param>
/// <param name="holderInstantiator">Instantiator of the result holder (used for "select new SomeClass(...)" queries).</param>
/// <remarks>
/// The <see cref="IDataReader"/> should already be positioned on the first record in <see cref="RowSelection"/>.
/// </remarks>
public EnumerableImpl(IDataReader reader, IDbCommand cmd, ISessionImplementor sess, IType[] types,
string[][] columnNames, RowSelection selection,
HolderInstantiator holderInstantiator)
{
_reader = reader;
_cmd = cmd;
_sess = sess;
_types = types;
_names = columnNames;
_selection = selection;
_holderInstantiator = holderInstantiator;
_single = _types.Length == 1;
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary<string, TypedValue> namedParameters, IDictionary<string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized, bool readOnly, bool cacheable, string cacheRegion, string comment, object[] collectionKeys, IResultTransformer transformer)
{
_positionalParameterTypes = positionalParameterTypes;
_positionalParameterValues = positionalParameterValues;
_namedParameters = namedParameters;
_lockModes = lockModes;
_rowSelection = rowSelection;
_cacheable = cacheable;
_cacheRegion = cacheRegion;
_comment = comment;
_collectionKeys = collectionKeys;
_isReadOnlyInitialized = isReadOnlyInitialized;
_readOnly = readOnly;
_resultTransformer = transformer;
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary<string, TypedValue> namedParameters,
IDictionary<string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized, bool readOnly, bool cacheable, string cacheRegion,
string comment, object[] collectionKeys, IResultTransformer transformer)
{
PositionalParameterTypes = positionalParameterTypes ?? new IType[0];
PositionalParameterValues = positionalParameterValues ?? new IType[0];
NamedParameters = namedParameters ?? new Dictionary<string, TypedValue>(1);
LockModes = lockModes;
RowSelection = rowSelection;
Cacheable = cacheable;
CacheRegion = cacheRegion;
Comment = comment;
CollectionKeys = collectionKeys;
IsReadOnlyInitialized = isReadOnlyInitialized;
this.readOnly = readOnly;
ResultTransformer = transformer;
}
/// <summary>
/// Create an <see cref="IEnumerable"/> wrapper over an <see cref="IDataReader"/>.
/// </summary>
/// <param name="reader">The <see cref="IDataReader"/> to enumerate over.</param>
/// <param name="cmd">The <see cref="IDbCommand"/> used to create the <see cref="IDataReader"/>.</param>
/// <param name="sess">The <see cref="ISession"/> to use to load objects.</param>
/// <param name="types">The <see cref="IType"/>s contained in the <see cref="IDataReader"/>.</param>
/// <param name="columnNames">The names of the columns in the <see cref="IDataReader"/>.</param>
/// <param name="selection">The <see cref="RowSelection"/> that should be applied to the <see cref="IDataReader"/>.</param>
/// <param name="holderType">Optional type of the result holder (used for "select new SomeClass(...)" queries).</param>
/// <remarks>
/// The <see cref="IDataReader"/> should already be positioned on the first record in <see cref="RowSelection"/>.
/// </remarks>
public EnumerableImpl( IDataReader reader, IDbCommand cmd, ISessionImplementor sess, IType[ ] types, string[ ][ ] columnNames, RowSelection selection,
System.Type holderType )
{
_reader = reader;
_cmd = cmd;
_sess = sess;
_types = types;
_names = columnNames;
_selection = selection;
if( holderType != null )
{
_holderConstructor = NHibernate.Util.ReflectHelper.GetConstructor(
holderType, types );
}
_single = _types.Length == 1;
}
/// <summary>
/// Initializes an instance of the <see cref="QueryParameters"/> class.
/// </summary>
/// <param name="positionalParameterTypes">An array of <see cref="IType"/> objects for the parameters.</param>
/// <param name="positionalParameterValues">An array of <see cref="object"/> objects for the parameters.</param>
/// <param name="namedParameters">An <see cref="IDictionary"/> that is <c>parameter name</c> keyed to a <see cref="TypedValue"/> value.</param>
/// <param name="lockModes">An <see cref="IDictionary"/> that is <c>hql alias</c> keyed to a LockMode value.</param>
/// <param name="rowSelection"></param>
public QueryParameters(
IType[ ] positionalParameterTypes,
object[ ] positionalParameterValues,
IDictionary namedParameters,
IDictionary lockModes,
RowSelection rowSelection,
bool cacheable,
string cacheRegion,
bool forceCacheRefresh )
{
_positionalParameterTypes = positionalParameterTypes;
_positionalParameterValues = positionalParameterValues;
_namedParameters = namedParameters;
_lockModes = lockModes;
_rowSelection = rowSelection;
_cacheable = cacheable;
_cacheRegion = cacheRegion;
_forceCacheRefresh = forceCacheRefresh;
}
protected SqlString GetSubSelectWithLimits(SqlString subquery, ICollection<IParameterSpecification> parameterSpecs, RowSelection processedRowSelection, IDictionary<string, TypedValue> parameters)
{
ISessionFactoryImplementor sessionFactory = Factory;
Dialect.Dialect dialect = sessionFactory.Dialect;
RowSelection selection = processedRowSelection;
bool useLimit = UseLimit(selection, dialect);
if (useLimit)
{
bool hasFirstRow = GetFirstRow(selection) > 0;
bool useOffset = hasFirstRow && dialect.SupportsLimitOffset;
int max = GetMaxOrLimit(dialect, selection);
int? skip = useOffset ? (int?)dialect.GetOffsetValue(GetFirstRow(selection)) : null;
int? take = max != int.MaxValue ? (int?)max : null;
Parameter skipSqlParameter = null;
Parameter takeSqlParameter = null;
if (skip.HasValue)
{
string skipParameterName = "nhsubselectskip";
var skipParameter = new NamedParameterSpecification(1, 0, skipParameterName) { ExpectedType = NHibernateUtil.Int32 };
skipSqlParameter = Parameter.Placeholder;
skipSqlParameter.BackTrack = skipParameter.GetIdsForBackTrack(sessionFactory).First();
parameters.Add(skipParameterName, new TypedValue(skipParameter.ExpectedType, skip.Value, EntityMode.Poco));
parameterSpecs.Add(skipParameter);
}
if (take.HasValue)
{
string takeParameterName = "nhsubselecttake";
var takeParameter = new NamedParameterSpecification(1, 0, takeParameterName) { ExpectedType = NHibernateUtil.Int32 };
takeSqlParameter = Parameter.Placeholder;
takeSqlParameter.BackTrack = takeParameter.GetIdsForBackTrack(sessionFactory).First();
parameters.Add(takeParameterName, new TypedValue(takeParameter.ExpectedType, take.Value, EntityMode.Poco));
parameterSpecs.Add(takeParameter);
}
// The dialect can move the given parameters where he need, what it can't do is generates new parameters loosing the BackTrack.
SqlString result;
if (TryGetLimitString(dialect, subquery, skip, take, skipSqlParameter, takeSqlParameter, out result)) return result;
}
return subquery;
}
/// <summary>
/// Create an <see cref="IEnumerable"/> wrapper over an <see cref="IDataReader"/>.
/// </summary>
/// <param name="reader">The <see cref="IDataReader"/> to enumerate over.</param>
/// <param name="cmd">The <see cref="IDbCommand"/> used to create the <see cref="IDataReader"/>.</param>
/// <param name="session">The <see cref="ISession"/> to use to load objects.</param>
/// <param name="readOnly"></param>
/// <param name="types">The <see cref="IType"/>s contained in the <see cref="IDataReader"/>.</param>
/// <param name="columnNames">The names of the columns in the <see cref="IDataReader"/>.</param>
/// <param name="selection">The <see cref="RowSelection"/> that should be applied to the <see cref="IDataReader"/>.</param>
/// <param name="holderInstantiator">Instantiator of the result holder (used for "select new SomeClass(...)" queries).</param>
/// <remarks>
/// The <see cref="IDataReader"/> should already be positioned on the first record in <see cref="RowSelection"/>.
/// </remarks>
public EnumerableImpl(IDataReader reader,
IDbCommand cmd,
IEventSource session,
bool readOnly,
IType[] types,
string[][] columnNames,
RowSelection selection,
HolderInstantiator holderInstantiator)
{
_reader = reader;
_cmd = cmd;
_session = session;
_readOnly = readOnly;
_types = types;
_names = columnNames;
_selection = selection;
_holderInstantiator = holderInstantiator;
_single = _types.Length == 1;
}
/// <summary>
/// Fetch a <c>IDbCommand</c>, call <c>SetMaxRows</c> and then execute it,
/// advance to the first result and return an SQL <c>IDataReader</c>
/// </summary>
/// <param name="st">The <see cref="IDbCommand" /> to execute.</param>
/// <param name="selection">The <see cref="RowSelection"/> to apply to the <see cref="IDbCommand"/> and <see cref="IDataReader"/>.</param>
/// <param name="autoDiscoverTypes">true if result types need to be auto-discovered by the loader; false otherwise.</param>
/// <param name="session">The <see cref="ISession" /> to load in.</param>
/// <param name="callable"></param>
/// <returns>An IDataReader advanced to the first record in RowSelection.</returns>
protected IDataReader GetResultSet(IDbCommand st, bool autoDiscoverTypes, bool callable, RowSelection selection,
ISessionImplementor session)
{
IDataReader rs = null;
try
{
log.Info(st.CommandText);
// TODO NH: Callable
rs = session.Batcher.ExecuteReader(st);
//NH: this is checked outside the WrapResultSet because we
// want to avoid the syncronization overhead in the vast majority
// of cases where IsWrapResultSetsEnabled is set to false
if (session.Factory.Settings.IsWrapResultSetsEnabled)
rs = WrapResultSet(rs);
Dialect.Dialect dialect = session.Factory.Dialect;
if (!dialect.SupportsLimitOffset || !UseLimit(selection, dialect))
{
Advance(rs, selection);
}
if (autoDiscoverTypes)
{
AutoDiscoverTypes(rs);
}
return rs;
}
catch (Exception sqle)
{
ADOExceptionReporter.LogExceptions(sqle);
session.Batcher.CloseCommand(st, rs);
throw;
}
}
/// <summary>
/// Performs dialect-specific manipulations on the limit value before returning it.
/// This method is applicable for use in limit statements only.
/// </summary>
internal static int? GetLimitUsingDialect(RowSelection selection, Dialect.Dialect dialect)
{
if (selection == null || selection.MaxRows == RowSelection.NoValue)
return null;
return dialect.GetLimitValue(GetFirstRow(selection), selection.MaxRows);
}
/// <summary>
/// Should we pre-process the SQL string, adding a dialect-specific
/// LIMIT clause.
/// </summary>
/// <param name="selection"></param>
/// <param name="dialect"></param>
/// <returns></returns>
internal bool UseLimit(RowSelection selection, Dialect.Dialect dialect)
{
return dialect.SupportsLimit && (HasMaxRows(selection) || HasOffset(selection));
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary <string, TypedValue> namedParameters, IDictionary <string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized, bool readOnly, bool cacheable, string cacheRegion, string comment, object[] collectionKeys, IResultTransformer transformer)
{
_positionalParameterTypes = positionalParameterTypes;
_positionalParameterValues = positionalParameterValues;
_namedParameters = namedParameters;
_lockModes = lockModes;
_rowSelection = rowSelection;
_cacheable = cacheable;
_cacheRegion = cacheRegion;
_comment = comment;
_collectionKeys = collectionKeys;
_isReadOnlyInitialized = isReadOnlyInitialized;
_readOnly = readOnly;
_resultTransformer = transformer;
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary <string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized, bool readOnly, bool cacheable, string cacheRegion, string comment, bool isLookupByNaturalKey, IResultTransformer transformer, IDictionary <int, int> tempPagingParameterIndexes)
: this(positionalParameterTypes, positionalParameterValues, null, lockModes, rowSelection, isReadOnlyInitialized, readOnly, cacheable, cacheRegion, comment, null, transformer)
{
NaturalKeyLookup = isLookupByNaturalKey;
_tempPagingParameterIndexes = tempPagingParameterIndexes;
}
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary <string, TypedValue> namedParameters, IDictionary <string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized, bool readOnly, bool cacheable, string cacheRegion, string comment, object[] collectionKeys, object optionalObject, string optionalEntityName, object optionalId, IResultTransformer transformer)
: this(positionalParameterTypes, positionalParameterValues, namedParameters, lockModes, rowSelection, isReadOnlyInitialized, readOnly, cacheable, cacheRegion, comment, collectionKeys, transformer)
{
_optionalEntityName = optionalEntityName;
_optionalId = optionalId;
_optionalObject = optionalObject;
}
public QueryParameters(IDictionary <string, TypedValue> namedParameters, IDictionary <string, LockMode> lockModes, RowSelection rowSelection, bool isReadOnlyInitialized,
bool readOnly, bool cacheable, string cacheRegion, string comment, bool isLookupByNaturalKey, IResultTransformer transformer)
: this(
ArrayHelper.EmptyTypeArray, ArrayHelper.EmptyObjectArray, namedParameters, lockModes, rowSelection, isReadOnlyInitialized, readOnly, cacheable, cacheRegion, comment, null,
transformer)
{
// used by CriteriaTranslator
NaturalKeyLookup = isLookupByNaturalKey;
}
public QueryParameters GetQueryParameters()
{
ArrayList values = new ArrayList(usedTypedValues.Count);
List<IType> types = new List<IType>(usedTypedValues.Count);
foreach (TypedValue value in usedTypedValues)
{
values.Add(value.Value);
types.Add(value.Type);
}
object[] valueArray = values.ToArray();
IType[] typeArray = types.ToArray();
RowSelection selection = new RowSelection();
selection.FirstRow = rootCriteria.FirstResult;
selection.MaxRows = rootCriteria.MaxResults;
selection.Timeout = rootCriteria.Timeout;
selection.FetchSize = rootCriteria.FetchSize;
Dictionary<string, LockMode> lockModes = new Dictionary<string, LockMode>();
foreach (KeyValuePair<string, LockMode> me in rootCriteria.LockModes)
{
ICriteria subcriteria = GetAliasedCriteria(me.Key);
lockModes[GetSQLAlias(subcriteria)] = me.Value;
}
foreach (CriteriaImpl.Subcriteria subcriteria in rootCriteria.IterateSubcriteria())
{
LockMode lm = subcriteria.LockMode;
if (lm != null)
{
lockModes[GetSQLAlias(subcriteria)] = lm;
}
}
return
new QueryParameters(typeArray, valueArray, lockModes, selection, rootCriteria.Cacheable, rootCriteria.CacheRegion,
rootCriteria.Comment, rootCriteria.LookupByNaturalKey, rootCriteria.ResultTransformer);
}
private static bool HasOffset(RowSelection selection)
{
return selection != null && selection.MaxRows != RowSelection.NoValue;
}
public QueryParameters GetQueryParameters()
{
ArrayList values = new ArrayList();
ArrayList types = new ArrayList();
foreach (CriteriaImpl.CriterionEntry ce in rootCriteria.IterateExpressionEntries())
{
TypedValue[] tv = ce.Criterion.GetTypedValues(ce.Criteria, this);
for (int i = 0; i < tv.Length; i++)
{
values.Add(tv[i].Value);
types.Add(tv[i].Type);
}
}
if (rootCriteria.Projection != null)
{
TypedValue[] tv = rootCriteria.Projection.GetTypedValues(rootCriteria.ProjectionCriteria, this);
for (int i = 0; i < tv.Length; i++)
{
values.Add(tv[i].Value);
types.Add(tv[i].Type);
}
}
object[] valueArray = values.ToArray();
IType[] typeArray = (IType[])types.ToArray(typeof(IType));
RowSelection selection = new RowSelection();
selection.FirstRow = rootCriteria.FirstResult;
selection.MaxRows = rootCriteria.MaxResults;
selection.Timeout = rootCriteria.Timeout;
selection.FetchSize = rootCriteria.FetchSize;
IDictionary lockModes = new Hashtable();
foreach (DictionaryEntry me in rootCriteria.LockModes)
{
ICriteria subcriteria = GetAliasedCriteria((string)me.Key);
lockModes[GetSQLAlias(subcriteria)] = me.Value;
}
foreach (CriteriaImpl.Subcriteria subcriteria in rootCriteria.IterateSubcriteria())
{
LockMode lm = subcriteria.LockMode;
if (lm != null)
{
lockModes[GetSQLAlias(subcriteria)] = lm;
}
}
return new QueryParameters(
typeArray,
valueArray,
lockModes,
selection,
rootCriteria.Cacheable,
rootCriteria.CacheRegion,
string.Empty, // TODO H3: rootCriteria.Comment,
rootCriteria.IsLookupByNaturalKey(),
null
);
}
/// <summary>
/// Performs dialect-specific manipulations on the offset value before returning it.
/// This method is applicable for use in limit statements only.
/// </summary>
internal static int? GetOffsetUsingDialect(RowSelection selection, Dialect.Dialect dialect)
{
int firstRow = GetFirstRow(selection);
if (firstRow == 0)
return null;
return dialect.GetOffsetValue(firstRow);
}
internal static bool HasMaxRows(RowSelection selection)
{
// it used to be selection.MaxRows != null -> since an Int32 will always
// have a value I'll compare it to the static field NoValue used to initialize
// max rows to nothing
return selection != null && selection.MaxRows != RowSelection.NoValue;
}
/// <summary>
/// Some dialect-specific LIMIT clauses require the maximium last row number
/// (aka, first_row_number + total_row_count), while others require the maximum
/// returned row count (the total maximum number of rows to return).
/// </summary>
/// <param name="selection">The selection criteria </param>
/// <param name="dialect">The dialect </param>
/// <returns> The appropriate value to bind into the limit clause. </returns>
internal static int GetMaxOrLimit(Dialect.Dialect dialect, RowSelection selection)
{
int firstRow = GetFirstRow(selection);
int rowCount = selection.MaxRows;
if (rowCount == RowSelection.NoValue)
return int.MaxValue;
return dialect.GetLimitValue(firstRow, rowCount);
}
/// <summary>
/// Should we pre-process the SQL string, adding a dialect-specific
/// LIMIT clause.
/// </summary>
/// <param name="selection"></param>
/// <param name="dialect"></param>
/// <returns></returns>
internal static bool UseLimit(RowSelection selection, Dialect.Dialect dialect)
{
return dialect.SupportsLimit && HasMaxRows(selection);
}
/// <summary>
/// Advance the cursor to the first required row of the <c>IDataReader</c>
/// </summary>
internal static void Advance(IDataReader rs, RowSelection selection)
{
int firstRow = GetFirstRow(selection);
if (firstRow != 0)
{
// DataReaders are forward-only, readonly, so we have to step through
for (int i = 0; i < firstRow; i++)
{
rs.Read();
}
}
}
/// <summary>
/// Bind parameters needed by the dialect-specific LIMIT clause
/// </summary>
/// <returns>The number of parameters bound</returns>
internal static int BindLimitParameters(IDbCommand st, int index, RowSelection selection, ISessionImplementor session)
{
Dialect.Dialect dialect = session.Factory.Dialect;
if (!dialect.SupportsVariableLimit)
{
return 0;
}
if (!HasMaxRows(selection))
{
throw new AssertionFailure("max results not set");
}
int firstRow = GetFirstRow(selection);
int lastRow = GetMaxOrLimit(dialect, selection);
bool hasFirstRow = firstRow > 0 && dialect.SupportsLimitOffset;
bool reverse = dialect.BindLimitParametersInReverseOrder;
if (hasFirstRow)
{
((IDataParameter) st.Parameters[index + (reverse ? 1 : 0)]).Value = firstRow;
}
((IDataParameter) st.Parameters[index + ((reverse || !hasFirstRow) ? 0 : 1)]).Value = lastRow;
return hasFirstRow ? 2 : 1;
}
internal static int GetFirstRow(RowSelection selection)
{
if (selection == null || !selection.DefinesLimits)
{
return 0;
}
else
{
return selection.FirstRow > 0 ? selection.FirstRow : 0;
}
}
public QueryParameters CreateCopyUsing(RowSelection selection)
{
var copy = new QueryParameters(_positionalParameterTypes, _positionalParameterValues, _namedParameters, _lockModes,
selection, _readOnly, _cacheable, _cacheRegion, _comment, _collectionKeys,
_optionalObject, _optionalEntityName, _optionalId, _resultTransformer);
copy._positionalParameterLocations = _positionalParameterLocations;
copy.processedSQL = processedSQL;
copy.filteredParameterTypes = filteredParameterTypes;
copy.filteredParameterValues = filteredParameterValues;
copy.filteredParameterLocations = filteredParameterLocations;
return copy;
}
/// <summary>
/// Some dialect-specific LIMIT clauses require the maximium last row number
/// (aka, first_row_number + total_row_count), while others require the maximum
/// returned row count (the total maximum number of rows to return).
/// </summary>
/// <param name="selection">The selection criteria </param>
/// <param name="dialect">The dialect </param>
/// <returns> The appropriate value to bind into the limit clause. </returns>
internal static int GetMaxOrLimit(Dialect.Dialect dialect, RowSelection selection)
{
int firstRow = GetFirstRow(selection);
int lastRow = selection.MaxRows;
if (dialect.UseMaxForLimit)
{
return lastRow + firstRow;
}
else
{
return lastRow;
}
}
public QueryParameters GetQueryParameters()
{
RowSelection selection = new RowSelection();
selection.FirstRow = rootCriteria.FirstResult;
selection.MaxRows = rootCriteria.MaxResults;
selection.Timeout = rootCriteria.Timeout;
selection.FetchSize = rootCriteria.FetchSize;
var lockModes = new Dictionary<string, LockMode>();
foreach (KeyValuePair<string, LockMode> me in rootCriteria.LockModes)
{
ICriteria subcriteria = GetAliasedCriteria(me.Key);
lockModes[GetSQLAlias(subcriteria)] = me.Value;
}
foreach (CriteriaImpl.Subcriteria subcriteria in rootCriteria.IterateSubcriteria())
{
LockMode lm = subcriteria.LockMode;
if (lm != null)
{
lockModes[GetSQLAlias(subcriteria)] = lm;
}
}
IDictionary<string, TypedValue> queryNamedParameters = CollectedParameters.ToDictionary(np => np.Name, np => new TypedValue(np.Type, np.Value, EntityMode.Poco));
return
new QueryParameters(
queryNamedParameters,
lockModes,
selection,
rootCriteria.IsReadOnlyInitialized,
rootCriteria.IsReadOnlyInitialized ? rootCriteria.IsReadOnly : false,
rootCriteria.Cacheable,
rootCriteria.CacheRegion,
rootCriteria.Comment,
rootCriteria.LookupByNaturalKey,
rootCriteria.ResultTransformer);
}
/// <summary>
/// Limits the number of rows returned by the Sql query if necessary.
/// </summary>
/// <param name="st">The IDbCommand to limit.</param>
/// <param name="selection">The RowSelection that contains the MaxResults info.</param>
/// <remarks>TODO: This does not apply to ADO.NET at all</remarks>
protected void SetMaxRows(IDbCommand st, RowSelection selection)
{
//TODO: H2.0.3 - do we need this method??
//if (HasMaxRows(selection))
//{
// // there is nothing in ADO.NET to do anything similar
// // to Java's PreparedStatement.setMaxRows(int)
//}
}
public QueryParameters CreateCopyUsing(RowSelection selection)
{
var copy = new QueryParameters(PositionalParameterTypes, PositionalParameterValues, NamedParameters, LockModes,
selection, IsReadOnlyInitialized, readOnly, Cacheable, CacheRegion, Comment, CollectionKeys,
OptionalObject, OptionalEntityName, OptionalId, ResultTransformer)
{
ProcessedSql = ProcessedSql,
ProcessedSqlParameters = ProcessedSqlParameters.ToList()
};
return copy;
}
public IList List(ISessionImplementor session, QueryParameters queryParameters)
{
// Delegate to the QueryLoader...
ErrorIfDML();
var query = ( QueryNode ) _sqlAst;
bool hasLimit = queryParameters.RowSelection != null && queryParameters.RowSelection.DefinesLimits;
bool needsDistincting = ( query.GetSelectClause().IsDistinct || hasLimit ) && ContainsCollectionFetches;
QueryParameters queryParametersToUse;
if ( hasLimit && ContainsCollectionFetches )
{
log.Warn( "firstResult/maxResults specified with collection fetch; applying in memory!" );
var selection = new RowSelection
{
FetchSize = queryParameters.RowSelection.FetchSize,
Timeout = queryParameters.RowSelection.Timeout
};
queryParametersToUse = queryParameters.CreateCopyUsing( selection );
}
else
{
queryParametersToUse = queryParameters;
}
IList results = _queryLoader.List(session, queryParametersToUse);
if ( needsDistincting )
{
int includedCount = -1;
// NOTE : firstRow is zero-based
int first = !hasLimit || queryParameters.RowSelection.FirstRow == RowSelection.NoValue
? 0
: queryParameters.RowSelection.FirstRow;
int max = !hasLimit || queryParameters.RowSelection.MaxRows == RowSelection.NoValue
? -1
: queryParameters.RowSelection.MaxRows;
int size = results.Count;
var tmp = new List<object>();
var distinction = new IdentitySet();
for ( int i = 0; i < size; i++ )
{
object result = results[i];
if ( !distinction.Add(result ) )
{
continue;
}
includedCount++;
if ( includedCount < first )
{
continue;
}
tmp.Add( result );
// NOTE : ( max - 1 ) because first is zero-based while max is not...
if ( max >= 0 && ( includedCount - first ) >= ( max - 1 ) )
{
break;
}
}
results = tmp;
}
return results;
}
/// <summary>
/// Initializes an instance of the <see cref="QueryParameters"/> class.
/// </summary>
/// <param name="positionalParameterTypes">An array of <see cref="IType"/> objects for the parameters.</param>
/// <param name="positionalParameterValues">An array of <see cref="object"/> objects for the parameters.</param>
/// <param name="lockModes">An <see cref="IDictionary"/> that is hql alias keyed to a LockMode value.</param>
/// <param name="rowSelection"></param>
public QueryParameters(IType[] positionalParameterTypes, object[] positionalParameterValues, IDictionary lockModes, RowSelection rowSelection)
: this(positionalParameterTypes, positionalParameterValues, null, lockModes, rowSelection, false, null, false)
{
}
