71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
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/**
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* Ths example is implemented from here https://www.tutorialspoint.com/sqlite/sqlite_having_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 <iostream>
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using std::cout;
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using std::endl;
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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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float salary;
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};
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int main() {
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using namespace sqlite_orm;
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auto storage = make_storage("having.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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storage.sync_schema();
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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(Employee{8, "Paul", 24, "Houston", 20000.0});
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storage.replace(Employee{9, "James", 44, "Norway", 5000.0});
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storage.replace(Employee{10, "James", 45, "Texas", 5000.0});
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{
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// SELECT *
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// FROM COMPANY
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// GROUP BY name
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// HAVING count(name) < 2;
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auto rows = storage.get_all<Employee>(group_by(&Employee::name).having(lesser_than(count(&Employee::name), 2)));
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for(auto& employee: rows) {
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cout << storage.dump(employee) << endl;
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}
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cout << endl;
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}
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{
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// SELECT *
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// FROM COMPANY
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// GROUP BY name
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// HAVING count(name) > 2;
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auto rows =
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storage.get_all<Employee>(group_by(&Employee::name).having(greater_than(count(&Employee::name), 2)));
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for(auto& employee: rows) {
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cout << storage.dump(employee) << 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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