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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkDoubleArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkIntArray.h"
#include "vtkObjectFactory.h"
#include "vtkPostgreSQLDatabase.h"
#include "vtkPostgreSQLQuery.h"
#include "vtkSmartPointer.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkStringArray.h"
#include "vtkTable.h"
#include "vtkPostgreSQLToTableReader.h"
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkPostgreSQLToTableReader);
//------------------------------------------------------------------------------
vtkPostgreSQLToTableReader::vtkPostgreSQLToTableReader() = default;
//------------------------------------------------------------------------------
vtkPostgreSQLToTableReader::~vtkPostgreSQLToTableReader() = default;
//------------------------------------------------------------------------------
int vtkPostgreSQLToTableReader::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("vtkPostgreSQLDatabase"))
{
vtkErrorMacro(<< "Wrong type of database for this reader");
return 1;
}
if (this->TableName.empty())
{
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 =
"select column_name, data_type FROM information_schema.columns WHERE table_name = '";
queryStr += this->TableName;
queryStr += "';";
vtkPostgreSQLQuery* query = static_cast<vtkPostgreSQLQuery*>(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) ||
(columnType.find("serial") != std::string::npos) ||
(columnType.find("SERIAL") != std::string::npos))
{
vtkSmartPointer<vtkIntArray> column = vtkSmartPointer<vtkIntArray>::New();
column->SetName(columnName.c_str());
output->AddColumn(column);
columnTypes.emplace_back("int");
}
else if ((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.emplace_back("double");
}
else
{
vtkSmartPointer<vtkStringArray> column = vtkSmartPointer<vtkStringArray>::New();
column->SetName(columnName.c_str());
output->AddColumn(column);
columnTypes.emplace_back("string");
}
}
// do a query to get the contents of the PostgreSQL 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 vtkPostgreSQLToTableReader::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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