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/*=========================================================================
Program: Visualization Toolkit
Module: vtkMySQLToTableReader.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkDoubleArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkIntArray.h"
#include "vtkObjectFactory.h"
#include "vtkMySQLDatabase.h"
#include "vtkMySQLQuery.h"
#include "vtkSmartPointer.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkStringArray.h"
#include "vtkTable.h"
#include "vtkMySQLToTableReader.h"
//----------------------------------------------------------------------------
vtkStandardNewMacro(vtkMySQLToTableReader);
//----------------------------------------------------------------------------
vtkMySQLToTableReader::vtkMySQLToTableReader()
{
}
//----------------------------------------------------------------------------
vtkMySQLToTableReader::~vtkMySQLToTableReader()
{
}
//----------------------------------------------------------------------------
int vtkMySQLToTableReader::RequestData(vtkInformation *,
vtkInformationVector **,
vtkInformationVector *outputVector)
{
//Make sure we have all the information we need to provide a vtkTable
if(!this->Database)
{
vtkErrorMacro(<<"No open database connection");
return 1;
}
if(!this->Database->IsA("vtkMySQLDatabase"))
{
vtkErrorMacro(<<"Wrong type of database for this reader");
return 1;
}
if(this->TableName == "")
{
vtkErrorMacro(<<"No table selected");
return 1;
}
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// Return all data in the first piece ...
if(outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER()) > 0)
{
return 1;
}
vtkTable* const output = vtkTable::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
//perform a query to get the names and types of the columns
std::string queryStr = "SHOW COLUMNS FROM ";
queryStr += this->TableName;
vtkMySQLQuery *query =
static_cast<vtkMySQLQuery*>(this->Database->GetQueryInstance());
query->SetQuery(queryStr.c_str());
if(!query->Execute())
{
vtkErrorMacro(<<"Error performing 'show columns' query");
}
//use the results of the query to create columns of the proper name & type
std::vector<std::string> columnTypes;
while(query->NextRow())
{
std::string columnName = query->DataValue(0).ToString();
std::string columnType = query->DataValue(1).ToString();
if( (columnType.find("int") != std::string::npos) ||
(columnType.find("INT") != std::string::npos) )
{
vtkSmartPointer<vtkIntArray> column =
vtkSmartPointer<vtkIntArray>::New();
column->SetName(columnName.c_str());
output->AddColumn(column);
columnTypes.push_back("int");
}
else if( (columnType.find("float") != std::string::npos) ||
(columnType.find("FLOAT") != std::string::npos) ||
(columnType.find("double") != std::string::npos) ||
(columnType.find("DOUBLE") != std::string::npos) ||
(columnType.find("real") != std::string::npos) ||
(columnType.find("REAL") != std::string::npos) ||
(columnType.find("decimal") != std::string::npos) ||
(columnType.find("DECIMAL") != std::string::npos) ||
(columnType.find("numeric") != std::string::npos) ||
(columnType.find("NUMERIC") != std::string::npos) )
{
vtkSmartPointer<vtkDoubleArray> column =
vtkSmartPointer<vtkDoubleArray>::New();
column->SetName(columnName.c_str());
output->AddColumn(column);
columnTypes.push_back("double");
}
else
{
vtkSmartPointer<vtkStringArray> column =
vtkSmartPointer<vtkStringArray>::New();
column->SetName(columnName.c_str());
output->AddColumn(column);
columnTypes.push_back("string");
}
}
//do a query to get the contents of the MySQL table
queryStr = "SELECT * FROM ";
queryStr += this->TableName;
query->SetQuery(queryStr.c_str());
if(!query->Execute())
{
vtkErrorMacro(<<"Error performing 'select all' query");
}
//use the results of the query to populate the columns
while(query->NextRow())
{
for(int col = 0; col < query->GetNumberOfFields(); ++ col)
{
if(columnTypes[col] == "int")
{
vtkIntArray *column =
static_cast<vtkIntArray*>(output->GetColumn(col));
column->InsertNextValue(query->DataValue(col).ToInt());
}
else if(columnTypes[col] == "double")
{
vtkDoubleArray *column =
static_cast<vtkDoubleArray*>(output->GetColumn(col));
column->InsertNextValue(query->DataValue(col).ToDouble());
}
else
{
vtkStringArray *column =
static_cast<vtkStringArray*>(output->GetColumn(col));
column->InsertNextValue(query->DataValue(col).ToString());
}
}
}
query->Delete();
return 1;
}
//----------------------------------------------------------------------------
void vtkMySQLToTableReader::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
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