114 lines
4.4 KiB
C++
114 lines
4.4 KiB
C++
/**
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* This example was grabbed from here https://www.tutorialspoint.com/sqlite/sqlite_unions_clause.htm
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*/
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#include <sqlite_orm/sqlite_orm.h>
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#include <string>
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#include <cassert>
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#include <algorithm>
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#include <iostream>
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using std::cout;
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using std::endl;
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int main() {
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struct Employee {
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int id;
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std::string name;
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int age;
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std::string address;
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double salary;
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};
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struct Department {
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int id;
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std::string dept;
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int employeeId;
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};
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using namespace sqlite_orm;
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auto storage = make_storage("union.sqlite",
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make_table("COMPANY",
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make_column("ID", &Employee::id, primary_key()),
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make_column("NAME", &Employee::name),
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make_column("AGE", &Employee::age),
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make_column("ADDRESS", &Employee::address),
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make_column("SALARY", &Employee::salary)),
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make_table("DEPARTMENT",
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make_column("ID", &Department::id, primary_key()),
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make_column("DEPT", &Department::dept),
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make_column("EMP_ID", &Department::employeeId),
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foreign_key(&Department::employeeId).references(&Employee::id)));
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storage.sync_schema();
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// order matters
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storage.remove_all<Department>();
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storage.remove_all<Employee>();
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storage.replace(Employee{1, "Paul", 32, "California", 20000.0});
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storage.replace(Employee{2, "Allen", 25, "Texas", 15000.0});
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storage.replace(Employee{3, "Teddy", 23, "Norway", 20000.0});
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storage.replace(Employee{4, "Mark", 25, "Rich-Mond", 65000.0});
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storage.replace(Employee{5, "David", 27, "Texas", 85000.0});
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storage.replace(Employee{6, "Kim", 22, "South-Hall", 45000.0});
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storage.replace(Employee{7, "James", 24, "Houston", 10000.0});
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storage.replace(Department{1, "IT Billing", 1});
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storage.replace(Department{2, "Engineering", 2});
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storage.replace(Department{3, "Finance", 7});
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storage.replace(Department{4, "Engineering", 3});
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storage.replace(Department{5, "Finance", 4});
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storage.replace(Department{6, "Engineering", 5});
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storage.replace(Department{7, "Finance", 6});
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{
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// SELECT EMP_ID, NAME, DEPT
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// FROM COMPANY
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// INNER JOIN DEPARTMENT
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// ON COMPANY.ID = DEPARTMENT.EMP_ID
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// UNION
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// SELECT EMP_ID, NAME, DEPT
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// FROM COMPANY
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// LEFT OUTER JOIN DEPARTMENT
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// ON COMPANY.ID = DEPARTMENT.EMP_ID;
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auto rows = storage.select(
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union_(select(columns(&Department::employeeId, &Employee::name, &Department::dept),
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inner_join<Department>(on(is_equal(&Employee::id, &Department::employeeId)))),
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select(columns(&Department::employeeId, &Employee::name, &Department::dept),
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left_outer_join<Department>(on(is_equal(&Employee::id, &Department::employeeId))))));
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assert(rows.size() == 7);
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std::sort(rows.begin(), rows.end(), [](auto& lhs, auto& rhs) {
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return std::get<0>(lhs) < std::get<0>(rhs);
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});
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for(auto& row: rows) {
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cout << std::get<0>(row) << '\t' << std::get<1>(row) << '\t' << std::get<2>(row) << endl;
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}
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cout << endl;
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}
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{
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// SELECT EMP_ID, NAME, DEPT
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// FROM COMPANY
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// INNER JOIN DEPARTMENT
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// ON COMPANY.ID = DEPARTMENT.EMP_ID
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// UNION ALL
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// SELECT EMP_ID, NAME, DEPT
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// FROM COMPANY
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// LEFT OUTER JOIN DEPARTMENT
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// ON COMPANY.ID = DEPARTMENT.EMP_ID;
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auto rows = storage.select(
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union_all(select(columns(&Department::employeeId, &Employee::name, &Department::dept),
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inner_join<Department>(on(is_equal(&Employee::id, &Department::employeeId)))),
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select(columns(&Department::employeeId, &Employee::name, &Department::dept),
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left_outer_join<Department>(on(is_equal(&Employee::id, &Department::employeeId))))));
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for(auto& row: rows) {
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cout << std::get<0>(row) << '\t' << std::get<1>(row) << '\t' << std::get<2>(row) << endl;
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}
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cout << endl;
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}
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return 0;
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}
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