private string GetColumnImage(string imageID, string column, string fileName)
{
string retImageFullName = "";
if (_odbcConnection == null)
{
return(retImageFullName);
}
//ODBC Access
System.Data.Odbc.OdbcCommand odbcCommand = null;
System.Data.Odbc.OdbcDataReader odbcRead = null;
try
{
odbcCommand = new System.Data.Odbc.OdbcCommand();
odbcCommand.CommandText = "SELECT " + column + " FROM DBSDESX.CHVT34A0_IMAGENS WHERE CREFARQ = '" + imageID + "'";
odbcCommand.Connection = _odbcConnection;
odbcRead = odbcCommand.ExecuteReader(); //System.Data.CommandBehavior.SequentialAccess
//byte[] _buf = (byte[]) odbcCommand.ExecuteScalar();
//if (!odbcRead.Read())
// return retImageFullName; //not found
}
catch (System.Exception ex)
{
throw ex;
}
//Read BLOB
System.Text.StringBuilder sb = new System.Text.StringBuilder();
int bufferSize = 100;
byte[] outByte = new byte[bufferSize];
long retval;
long startIndex = 0;
try
{
// Read bytes into outByte[] and retain the number of bytes returned.
retval = odbcRead.GetBytes(0, startIndex, outByte, 0, bufferSize);
// Continue while there are bytes beyond the size of the buffer.
while (retval == bufferSize)
{
//Write the buffer. (convert byte to char)
for (int i = 0; i < retval; i++)
{
sb.Append(System.Convert.ToChar(outByte[i]));
}
// Reposition start index to end of last buffer and fill buffer.
startIndex += bufferSize;
retval = odbcRead.GetBytes(0, startIndex, outByte, 0, bufferSize);
}
// Write the remaining buffer. (convert byte to char)
for (int i = 0; i < retval; i++)
{
sb.Append(System.Convert.ToChar(outByte[i]));
}
}
catch
{
}
//Close DB2 reader
try
{
odbcRead.Close();
odbcCommand.Dispose();
}
catch (System.Exception ex)
{
throw ex;
}
//Create file
try
{
if (sb.Length > 0)
{
string myDocFolder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.CommonPictures) + "\\";
string text = sb.ToString();
byte[] base64EncodedBytes = System.Convert.FromBase64String(text);
System.IO.File.WriteAllBytes(myDocFolder + fileName, base64EncodedBytes);
retImageFullName = myDocFolder + fileName;
}
}
catch (System.Exception ex)
{
throw ex;
}
return(retImageFullName);
}
// <summary>
/// recompute indexes for selected table
/// to speed up queries
/// </summary>
/// <returns></returns>
public static void UpdateIndexes(string tableType, DbConnect dbConnect)
{
ProtCidSettings.progressInfo.ResetCurrentProgressInfo();
DbQuery dbQuery = new DbQuery();
try
{
System.Data.Odbc.OdbcCommand updateIndexCommand = dbConnect.CreateCommand();
// retrieve user-defined indexes
string showIndexStr = @"select RDB$INDEX_NAME, RDB$RELATION_NAME from RDB$INDICES WHERE RDB$SYSTEM_FLAG = 0;";
//string showIndexStr = @"select RDB$INDEX_NAME from RDB$INDICES;";
updateIndexCommand.CommandText = showIndexStr;
System.Data.Odbc.OdbcDataReader indexReader = updateIndexCommand.ExecuteReader();
// ArrayList indexList = new ArrayList ();
Dictionary <string, List <string> > relationIndexHash = new Dictionary <string, List <string> > ();
string indexName = "";
string relationName = "";
if (indexReader.HasRows)
{
while (indexReader.Read())
{
relationName = indexReader.GetString(1).Trim().ToUpper();
if (relationName.IndexOf(tableType.ToUpper()) > -1)
{
indexName = indexReader.GetString(0).Trim().ToUpper();
if (relationIndexHash.ContainsKey(relationName))
{
relationIndexHash[relationName].Add(indexName);
}
else
{
List <string> relationIndexList = new List <string> ();
relationIndexList.Add(indexName);
relationIndexHash.Add(relationName, relationIndexList);
}
}
}
indexReader.Close();
}
foreach (string relationTable in relationIndexHash.Keys)
{
foreach (string index in relationIndexHash[relationTable])
{
// rebuild this index for cryst and interface
if (indexName.ToString().ToUpper().IndexOf("RDB$PRIMARY") == -1)
{
string inactiveIndexStr = string.Format("ALTER INDEX {0} INACTIVE;", index);
updateIndexCommand.CommandText = inactiveIndexStr;
updateIndexCommand.ExecuteNonQuery();
string activeIndexStr = string.Format("ALTER INDEX {0} ACTIVE;", index);
updateIndexCommand.CommandText = activeIndexStr;
updateIndexCommand.ExecuteNonQuery();
}
// recompute selectivity of this index
string updateSelectivityStr = string.Format("SET STATISTICS INDEX {0};", index);
updateIndexCommand.CommandText = updateSelectivityStr;
updateIndexCommand.ExecuteNonQuery();
}
}
}
catch (Exception ex)
{
// Displays the Error Message in the progress label.
ProtCidSettings.progressInfo.progStrQueue.Enqueue("Update Indexes Errors: " + ex.Message);
}
}