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#if MYSQL_6_9
// Copyright © 2009, 2013, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Collections;
using System.Data;
using Externals.MySql.Data.MySqlClient.Properties;
using Externals.MySql.Data.Types;
using System.Diagnostics;
using System.Collections.Generic;
namespace Externals.MySql.Data.MySqlClient
{
internal class ResultSet
{
private Driver driver;
private bool hasRows;
private bool[] uaFieldsUsed;
private MySqlField[] fields;
private IMySqlValue[] values;
private Dictionary<string, int> fieldHashCS;
private Dictionary<string, int> fieldHashCI;
private int rowIndex;
private bool readDone;
private bool isSequential;
private int seqIndex;
private bool isOutputParameters;
private int affectedRows;
private long insertedId;
private int statementId;
private int totalRows;
private int skippedRows;
private bool cached;
private List<IMySqlValue[]> cachedValues;
public ResultSet(int affectedRows, long insertedId)
{
this.affectedRows = affectedRows;
this.insertedId = insertedId;
readDone = true;
}
public ResultSet(Driver d, int statementId, int numCols)
{
affectedRows = -1;
insertedId = -1;
driver = d;
this.statementId = statementId;
rowIndex = -1;
LoadColumns(numCols);
isOutputParameters = IsOutputParameterResultSet();
hasRows = GetNextRow();
readDone = !hasRows;
}
#region Properties
public bool HasRows
{
get { return hasRows; }
}
public int Size
{
get { return fields == null ? 0 : fields.Length; }
}
public MySqlField[] Fields
{
get { return fields; }
}
public IMySqlValue[] Values
{
get { return values; }
}
public bool IsOutputParameters
{
get { return isOutputParameters; }
set { isOutputParameters = value; }
}
public int AffectedRows
{
get { return affectedRows; }
}
public long InsertedId
{
get { return insertedId; }
}
public int TotalRows
{
get { return totalRows; }
}
public int SkippedRows
{
get { return skippedRows; }
}
public bool Cached
{
get { return cached; }
set
{
cached = value;
if (cached && cachedValues == null)
cachedValues = new List<IMySqlValue[]>();
}
}
#endregion
/// <summary>
/// return the ordinal for the given column name
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public int GetOrdinal(string name)
{
// first we try a quick hash lookup
int ordinal;
if (fieldHashCS.TryGetValue(name, out ordinal))
return ordinal;
// ok that failed so we use our CI hash
if (fieldHashCI.TryGetValue( name, out ordinal ))
return ordinal;
// Throw an exception if the ordinal cannot be found.
throw new IndexOutOfRangeException(
String.Format(Resources.CouldNotFindColumnName, name));
}
/// <summary>
/// Retrieve the value as the given column index
/// </summary>
/// <param name="index">The column value to retrieve</param>
/// <returns>The value as the given column</returns>
public IMySqlValue this[int index]
{
get
{
if (rowIndex < 0)
throw new MySqlException(Resources.AttemptToAccessBeforeRead);
// keep count of how many columns we have left to access
uaFieldsUsed[index] = true;
if (isSequential && index != seqIndex)
{
if (index < seqIndex)
throw new MySqlException(Resources.ReadingPriorColumnUsingSeqAccess);
while (seqIndex < (index - 1))
driver.SkipColumnValue(values[++seqIndex]);
values[index] = driver.ReadColumnValue(index, fields[index], values[index]);
seqIndex = index;
}
return values[index];
}
}
private bool GetNextRow()
{
bool fetched = driver.FetchDataRow(statementId, Size);
if (fetched)
totalRows++;
return fetched;
}
public bool NextRow(CommandBehavior behavior)
{
if (readDone)
{
if (Cached) return CachedNextRow(behavior);
return false;
}
if ((behavior & CommandBehavior.SingleRow) != 0 && rowIndex == 0)
return false;
isSequential = (behavior & CommandBehavior.SequentialAccess) != 0;
seqIndex = -1;
// if we are at row index >= 0 then we need to fetch the data row and load it
if (rowIndex >= 0)
{
bool fetched = false;
try
{
fetched = GetNextRow();
}
catch (MySqlException ex)
{
if (ex.IsQueryAborted)
{
// avoid hanging on Close()
readDone = true;
}
throw;
}
if (!fetched)
{
readDone = true;
return false;
}
}
if (!isSequential) ReadColumnData(false);
rowIndex++;
return true;
}
private bool CachedNextRow(CommandBehavior behavior)
{
if ((behavior & CommandBehavior.SingleRow) != 0 && rowIndex == 0)
return false;
if (rowIndex == (totalRows - 1)) return false;
rowIndex++;
values = cachedValues[rowIndex];
return true;
}
/// <summary>
/// Closes the current resultset, dumping any data still on the wire
/// </summary>
public void Close()
{
if (!readDone)
{
// if we have rows but the user didn't read the first one then mark it as skipped
if (HasRows && rowIndex == -1)
skippedRows++;
try
{
while (driver.IsOpen && driver.SkipDataRow())
{
totalRows++;
skippedRows++;
}
}
catch (System.IO.IOException)
{
// it is ok to eat IO exceptions here, we just want to
// close the result set
}
readDone = true;
}
else if (driver == null)
CacheClose();
driver = null;
if (Cached) CacheReset();
}
private void CacheClose()
{
skippedRows = totalRows - rowIndex - 1;
}
private void CacheReset()
{
if (!Cached) return;
rowIndex = -1;
affectedRows = -1;
insertedId = -1;
skippedRows = 0;
}
public bool FieldRead(int index)
{
Debug.Assert(Size > index);
return uaFieldsUsed[index];
}
public void SetValueObject(int i, IMySqlValue valueObject)
{
Debug.Assert(values != null);
Debug.Assert(i < values.Length);
values[i] = valueObject;
}
private bool IsOutputParameterResultSet()
{
if (driver.HasStatus(ServerStatusFlags.OutputParameters)) return true;
if (fields.Length == 0) return false;
for (int x = 0; x < fields.Length; x++)
if (!fields[x].ColumnName.StartsWith("@" + StoredProcedure.ParameterPrefix, StringComparison.OrdinalIgnoreCase)) return false;
return true;
}
/// <summary>
/// Loads the column metadata for the current resultset
/// </summary>
private void LoadColumns(int numCols)
{
fields = driver.GetColumns(numCols);
values = new IMySqlValue[numCols];
uaFieldsUsed = new bool[numCols];
fieldHashCS = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
fieldHashCI = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
for (int i = 0; i < fields.Length; i++)
{
string columnName = fields[i].ColumnName;
if (!fieldHashCS.ContainsKey(columnName))
fieldHashCS.Add(columnName, i);
if (!fieldHashCI.ContainsKey(columnName))
fieldHashCI.Add(columnName, i);
values[i] = fields[i].GetValueObject();
}
}
private void ReadColumnData(bool outputParms)
{
for (int i = 0; i < Size; i++)
values[i] = driver.ReadColumnValue(i, fields[i], values[i]);
// if we are caching then we need to save a copy of this row of data values
if (Cached)
cachedValues.Add((IMySqlValue[])values.Clone());
// we don't need to worry about caching the following since you won't have output
// params with TableDirect commands
if (outputParms)
{
bool rowExists = driver.FetchDataRow(statementId, fields.Length);
rowIndex = 0;
if (rowExists)
throw new MySqlException(Resources.MoreThanOneOPRow);
}
}
}
}
#endif