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321 lines
10 KiB
321 lines
10 KiB
#if MYSQL_6_10
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// Copyright © 2009, 2018, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Diagnostics;
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using Externals.MySql.Data.Types;
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namespace Externals.MySql.Data.MySqlClient
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{
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internal class ResultSet
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{
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private Driver _driver;
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private bool[] _uaFieldsUsed;
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private Dictionary<string, int> _fieldHashCi;
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private int _rowIndex;
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private bool _readDone;
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private bool _isSequential;
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private int _seqIndex;
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private readonly int _statementId;
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private bool _cached;
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private List<IMySqlValue[]> _cachedValues;
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public ResultSet(int affectedRows, long insertedId)
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{
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AffectedRows = affectedRows;
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InsertedId = insertedId;
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_readDone = true;
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}
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public ResultSet(Driver d, int statementId, int numCols)
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{
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AffectedRows = -1;
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InsertedId = -1;
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_driver = d;
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_statementId = statementId;
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_rowIndex = -1;
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LoadColumns(numCols);
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IsOutputParameters = IsOutputParameterResultSet();
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HasRows = GetNextRow();
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_readDone = !HasRows;
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}
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#region Properties
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public bool HasRows { get; }
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public int Size => Fields?.Length ?? 0;
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public MySqlField[] Fields { get; private set; }
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public IMySqlValue[] Values { get; private set; }
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public bool IsOutputParameters { get; set; }
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public int AffectedRows { get; private set; }
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public long InsertedId { get; private set; }
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public int TotalRows { get; private set; }
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public int SkippedRows { get; private set; }
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public bool Cached
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{
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get { return _cached; }
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set
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{
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_cached = value;
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if (_cached && _cachedValues == null)
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_cachedValues = new List<IMySqlValue[]>();
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}
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}
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#endregion
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/// <summary>
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/// return the ordinal for the given column name
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/// </summary>
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/// <param name="name"></param>
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/// <returns></returns>
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public int GetOrdinal(string name)
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{
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int ordinal;
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// quick hash lookup using CI hash
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if (_fieldHashCi.TryGetValue(name, out ordinal))
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return ordinal;
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// Throw an exception if the ordinal cannot be found.
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throw new IndexOutOfRangeException(
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String.Format(Resources.CouldNotFindColumnName, name));
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}
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/// <summary>
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/// Retrieve the value as the given column index
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/// </summary>
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/// <param name="index">The column value to retrieve</param>
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/// <returns>The value as the given column</returns>
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public IMySqlValue this[int index]
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{
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get
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{
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if (_rowIndex < 0)
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throw new MySqlException(Resources.AttemptToAccessBeforeRead);
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// keep count of how many columns we have left to access
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_uaFieldsUsed[index] = true;
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if (_isSequential && index != _seqIndex)
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{
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if (index < _seqIndex)
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throw new MySqlException(Resources.ReadingPriorColumnUsingSeqAccess);
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while (_seqIndex < (index - 1))
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_driver.SkipColumnValue(Values[++_seqIndex]);
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Values[index] = _driver.ReadColumnValue(index, Fields[index], Values[index]);
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_seqIndex = index;
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}
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return Values[index];
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}
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}
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private bool GetNextRow()
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{
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bool fetched = _driver.FetchDataRow(_statementId, Size);
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if (fetched)
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TotalRows++;
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return fetched;
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}
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public bool NextRow(CommandBehavior behavior)
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{
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if (_readDone)
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{
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if (Cached) return CachedNextRow(behavior);
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return false;
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}
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if ((behavior & CommandBehavior.SingleRow) != 0 && _rowIndex == 0)
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return false;
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_isSequential = (behavior & CommandBehavior.SequentialAccess) != 0;
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_seqIndex = -1;
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// if we are at row index >= 0 then we need to fetch the data row and load it
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if (_rowIndex >= 0)
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{
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bool fetched = false;
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try
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{
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fetched = GetNextRow();
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}
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catch (MySqlException ex)
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{
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if (ex.IsQueryAborted)
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{
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// avoid hanging on Close()
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_readDone = true;
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}
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throw;
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}
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if (!fetched)
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{
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_readDone = true;
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return false;
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}
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}
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if (!_isSequential) ReadColumnData(false);
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_rowIndex++;
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return true;
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}
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private bool CachedNextRow(CommandBehavior behavior)
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{
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if ((behavior & CommandBehavior.SingleRow) != 0 && _rowIndex == 0)
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return false;
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if (_rowIndex == (TotalRows - 1)) return false;
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_rowIndex++;
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Values = _cachedValues[_rowIndex];
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return true;
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}
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/// <summary>
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/// Closes the current resultset, dumping any data still on the wire
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/// </summary>
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public void Close()
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{
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if (!_readDone)
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{
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// if we have rows but the user didn't read the first one then mark it as skipped
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if (HasRows && _rowIndex == -1)
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SkippedRows++;
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try
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{
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while (_driver.IsOpen && _driver.SkipDataRow())
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{
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TotalRows++;
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SkippedRows++;
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}
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}
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catch (System.IO.IOException)
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{
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// it is ok to eat IO exceptions here, we just want to
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// close the result set
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}
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_readDone = true;
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}
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else if (_driver == null)
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CacheClose();
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_driver = null;
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if (Cached) CacheReset();
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}
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private void CacheClose()
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{
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SkippedRows = TotalRows - _rowIndex - 1;
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}
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private void CacheReset()
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{
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if (!Cached) return;
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_rowIndex = -1;
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AffectedRows = -1;
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InsertedId = -1;
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SkippedRows = 0;
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}
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public bool FieldRead(int index)
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{
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Debug.Assert(Size > index);
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return _uaFieldsUsed[index];
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}
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public void SetValueObject(int i, IMySqlValue valueObject)
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{
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Debug.Assert(Values != null);
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Debug.Assert(i < Values.Length);
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Values[i] = valueObject;
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}
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private bool IsOutputParameterResultSet()
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{
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if (_driver.HasStatus(ServerStatusFlags.OutputParameters)) return true;
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if (Fields.Length == 0) return false;
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for (int x = 0; x < Fields.Length; x++)
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if (!Fields[x].ColumnName.StartsWith("@" + StoredProcedure.ParameterPrefix, StringComparison.OrdinalIgnoreCase)) return false;
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return true;
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}
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/// <summary>
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/// Loads the column metadata for the current resultset
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/// </summary>
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private void LoadColumns(int numCols)
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{
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Fields = _driver.GetColumns(numCols);
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Values = new IMySqlValue[numCols];
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_uaFieldsUsed = new bool[numCols];
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_fieldHashCi = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
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for (int i = 0; i < Fields.Length; i++)
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{
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string columnName = Fields[i].ColumnName;
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if (!_fieldHashCi.ContainsKey(columnName))
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_fieldHashCi.Add(columnName, i);
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Values[i] = Fields[i].GetValueObject();
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}
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}
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private void ReadColumnData(bool outputParms)
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{
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for (int i = 0; i < Size; i++)
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Values[i] = _driver.ReadColumnValue(i, Fields[i], Values[i]);
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// if we are caching then we need to save a copy of this row of data values
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if (Cached)
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_cachedValues.Add((IMySqlValue[])Values.Clone());
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// we don't need to worry about caching the following since you won't have output
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// params with TableDirect commands
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if (!outputParms) return;
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bool rowExists = _driver.FetchDataRow(_statementId, Fields.Length);
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_rowIndex = 0;
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if (rowExists)
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throw new MySqlException(Resources.MoreThanOneOPRow);
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}
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}
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}
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#endif
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