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Microsoft JDBC Driver for SQL Server.
//---------------------------------------------------------------------------------------------------------------------------------
// File: StreamColInfo.java
//
//
// Microsoft JDBC Driver for SQL Server
// Copyright(c) Microsoft Corporation
// All rights reserved.
// MIT License
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files(the ""Software""),
// to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and / or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions :
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//---------------------------------------------------------------------------------------------------------------------------------
package com.microsoft.sqlserver.jdbc;
/**
* StreamColInfo interprets the data stream from a COLINFO TDS token
*/
final class StreamColInfo extends StreamPacket
{
private TDSReader tdsReader;
private TDSReaderMark colInfoMark;
StreamColInfo()
{
super(TDS.TDS_COLINFO);
}
void setFromTDS(TDSReader tdsReader) throws SQLServerException
{
if (TDS.TDS_COLINFO != tdsReader.readUnsignedByte())
assert false : "Not a COLINFO token";
this.tdsReader = tdsReader;
int tokenLength = tdsReader.readUnsignedShort();
colInfoMark = tdsReader.mark();
tdsReader.skip(tokenLength);
}
int applyTo(Column[] columns) throws SQLServerException
{
int numTables = 0;
// Read and apply the column info for each column
TDSReaderMark currentMark = tdsReader.mark();
tdsReader.reset(colInfoMark);
for (int i = 0; i < columns.length; i++)
{
Column col = columns[i];
// Ignore the column number, per TDS spec.
// Column info is returned for each column, ascending by column index,
// so iterating through the column info is sufficient.
tdsReader.readUnsignedByte();
// Set the column's table number, keeping track of the maximum table number
// representing the number of tables encountered.
col.setTableNum(tdsReader.readUnsignedByte());
if (col.getTableNum() > numTables)
numTables = col.getTableNum();
// Set the other column info
col.setInfoStatus(tdsReader.readUnsignedByte());
if (col.hasDifferentName())
col.setBaseColumnName(tdsReader.readUnicodeString(tdsReader.readUnsignedByte()));
}
tdsReader.reset(currentMark);
return numTables;
}
}