aula11tRESTApi

Aula11tRestApiApplication.java

package pd.aula11tRESTApi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Aula11tRestApiApplication {

	public static void main(String[] args) {
		SpringApplication.run(Aula11tRestApiApplication.class, args);
	}

}

Country.java

package pd.aula11tRESTApi;

public class Country {
    private String nome;
    private int population;

    public Country(String nome, int population) {
        this.nome = nome;
        this.population = population;
    }

    public String getNome() {
        return nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public int getPopulation() {
        return population;
    }

    public void setPopulation(int population) {
        this.population = population;
    }
}

HelloWorld.java

package pd.aula11tRESTApi;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("hello-world")
public class HelloWorld {
//http://localhost:8080/hello-world?name=pedro
//curl -i http://localhost:8080/hello-world?name=pedro
    /*
    //v1
    @GetMapping("")
    public String get1(@RequestParam(value="name", required = false)String req_name){
        if(req_name != null){
            return "Hello " + req_name + "!";
        }else{
            return "Hello world";
        }
    }

    @GetMapping("{name}")
    public String get2(@PathVariable("name") String provided_name){
        return "Hello " + provided_name + "!";
    }
*/
    /*
    //v2
    @GetMapping(value = {"","{name}"})
    public String get1(@RequestParam(value="name", required = false)String req_name, @PathVariable(value = "name", required = false) String path_name){
        if(path_name != null){
            return  "Hello " + path_name + "!";
        }else if(req_name != null){
            return "Hello " + req_name + "!";
        }else{
            return "Hello world";
        }
    }
    */
}

HelloWorldDB.java

package pd.aula11tRESTApi;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;


public class HelloWorldDB {

    @GetMapping("world/countries")
    public List<String> getCountries(@RequestParam(value="name", required=false) String name,
                                     @RequestParam(value="min-pop", required=false) String min_population) throws SQLException {

        List<String> countries = new ArrayList<>();

        try( Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/world", "root", "");
             Statement st = conn.createStatement()){

            String query = "select name, population from country";

            if(name!=null){
                query += " where name like '%" + name +"%'";

                if (min_population!=null){
                    query += " and population>=" + min_population;
                }
            }else if(min_population!=null){
                query += " where population>=" + min_population;
            }

            ResultSet rs = st.executeQuery(query);

            while(rs.next()){
                countries.add(rs.getString("name"));
            }

        }catch(SQLException ex){
            System.out.println(ex);
            throw ex;
        }

        return countries;

    }

    @GetMapping("world/countries/{name}")
    public ResponseEntity getCountries(@PathVariable("name") String name){

        Country result;

        try( Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/world", "root", "");
             Statement st = conn.createStatement()){

            String query = "select name, population from country where name='"+name+"'";

            ResultSet rs = st.executeQuery(query);

            if(rs.next()){
                result = new Country(rs.getString("name"), rs.getInt("population"));
            }else{
                return ResponseEntity.status(HttpStatus.NOT_FOUND).body("Country " + name + " not found!");
            }

        }catch(SQLException ex){
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(ex.toString());
        }

        return ResponseEntity.status(HttpStatus.OK).body(result);

    }
}
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