Hyper API for C++ 0.0.19484
Hyper client library for C++ applications
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delete_data_in_existing_hyper_file.cpp

An example of how to delete data in an existing Hyper file.

An example of how to delete data in an existing Hyper file.

#include <fstream>
#include <iostream>
#include <string>
static void copy(const std::string& sourcePath, const std::string& destinationPath) {
std::ifstream source(sourcePath, std::ios::binary);
std::ofstream destination(destinationPath, std::ios::binary);
destination << source.rdbuf();
source.close();
destination.close();
}
static void runDeleteDataInExistingHyperFile() {
std::cout << "EXAMPLE - Delete data from an existing Hyper file" << std::endl;
// Path to a Hyper file containing all data inserted into Customer, Product, Orders and LineItems table
// See "insert_data_into_multiple_tables.cpp" for an example that works with the complete schema.
const std::string pathToSourceDatabase = "data/superstore_sample.hyper";
// Make a copy of the superstore example Hyper file.
const std::string pathToDatabase = "data/superstore_sample_delete.hyper";
copy(pathToSourceDatabase, pathToDatabase);
// Starts the Hyper Process with telemetry enabled to send data to Tableau.
// To opt out, simply set telemetry=hyperapi::Telemetry::DoNotSendUsageDataToTableau.
{
// Connect to existing Hyper file "superstore_sample_delete.hyper".
{
hyperapi::Connection connection(hyper.getEndpoint(), pathToDatabase);
std::cout << "Delete all rows from customer with the name 'Dennis Kane' from table " << hyperapi::escapeName("Orders") << "." << std::endl;
// `executeCommand` executes a SQL statement and returns the impacted row count.
int64_t rowCount = connection.executeCommand(
"DELETE FROM " + hyperapi::escapeName("Orders") + " WHERE " + hyperapi::escapeName("Customer ID") + " = ANY(SELECT " +
hyperapi::escapeName("Customer ID") + " FROM " + hyperapi::escapeName("Customer") + " WHERE " + hyperapi::escapeName("Customer Name") + " = " +
hyperapi::escapeStringLiteral("Dennis Kane") + ")");
std::cout << "The number of deleted rows in table " << hyperapi::escapeName("Orders") << " is " << rowCount << "." << std::endl
<< std::endl;
std::cout << "Delete all rows from customer with the name 'Dennis Kane' from table " << hyperapi::escapeName("Customer") << "." << std::endl;
rowCount = connection.executeCommand(
"DELETE FROM " + hyperapi::escapeName("Customer") + " WHERE " + hyperapi::escapeName("Customer Name") + " =" +
std::cout << "The number of deleted rows in table Customer is " << rowCount << "." << std::endl;
}
std::cout << "The connection to the Hyper file has been closed." << std::endl;
}
std::cout << "The Hyper Process has been shut down." << std::endl;
}
int main() {
try {
runDeleteDataInExistingHyperFile();
} catch (const hyperapi::HyperException& e) {
std::cout << e.toString() << std::endl;
return 1;
}
return 0;
}
Defines a Hyper connection.
Defines an exception object that is thrown on failure by the functions in the Hyper API C++ library.
std::string toString() const
Returns a formatted string containing the message and hint of the error and all causes.
Defines a Hyper process.
The main header of the Hyper API for C++.
@ SendUsageDataToTableau
Telemetry data will be sent to tableau to help improve the Hyper API.
std::string escapeName(string_view input)
Escapes the given string for safe usage in SQL query or command strings as an identifier.
std::string escapeStringLiteral(string_view input)
Escapes the given string for safe usage in SQL query or command strings as a string literal.