first commit

jdbc/.vscode/settings.json

+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

jdbc/README.md

+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

jdbc/src/App.java

+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.sql.SQLException;
+
+public class App {
+   public static void main(String args[]) {
+      Connection c = null;
+      try {
+         Class.forName("org.postgresql.Driver");
+         c = DriverManager
+               .getConnection("jdbc:postgresql://localhost:5432/bootcamp_market",
+                     "postgres", "postgres");
+      } catch (Exception e) {
+         e.printStackTrace();
+         System.err.println(e.getClass().getName() + ": " + e.getMessage());
+         System.exit(0);
+      }
+
+      System.out.println("Opened database successfully");
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt
+               .executeQuery("select a.nombre, apellido, count(b.cliente_id) Cantidad_factura from cliente a " +
+                     "inner join factura b " +
+                     "on a.id=b.cliente_id " +
+                     "group by a.nombre, a.apellido " +
+                     "order by Cantidad_factura desc;");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String apellido = rs.getString("apellido");
+            int cantidad = rs.getInt("Cantidad_factura");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("APELLIDO = " + apellido);
+            System.out.println("CANTIDAD FACTURA = " + cantidad);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+      } catch (Exception e) {
+         System.err.println(e.getClass().getName() + ": " + e.getMessage());
+      }
+
+      try {
+
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt.executeQuery("select b.nombre, count(moneda_id) Cantidad  from factura a\n" +
+               "inner join moneda b\n" +
+               "on b.id=a.moneda_id\n" +
+               "group by b.nombre, a.moneda_id\n" +
+               "order by cantidad desc");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            int cantidad = rs.getInt("Cantidad");
+            System.out.println("MONEDA = " + nombre);
+            System.out.println("CANTIDAD = " + cantidad);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt
+               .executeQuery("select f.nombre, f.apellido, cast(sum(c.cantidad*d.precio) as integer)  as Gasto\n" +
+                     "from factura_detalle c\n" +
+                     "inner join producto d \n" +
+                     "\ton d.id=producto_id\n" +
+                     "inner join factura e \n" +
+                     "\ton c.id=e.id\n" +
+                     "inner join Cliente f \n" +
+                     "\ton f.id=e.cliente_id\n" +
+                     "group by f.nombre, f.apellido\n" +
+                     "order by Gasto desc;");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String apellido = rs.getString("apellido");
+            int cantidad = rs.getInt("Gasto");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("APELLIDO = " + apellido);
+            System.out.println("MAYOR GASTO = " + cantidad);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt.executeQuery("select b.nombre, count(proveedor_id) Cantidad  from producto a\n" +
+               "inner join proveedor b\n" +
+               "on b.id=a.proveedor_id\n" +
+               "group by b.nombre, a.proveedor_id\n" +
+               "order by cantidad desc;");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            int cantidad = rs.getInt("Cantidad");
+            System.out.println("PROVEEDOR = " + nombre);
+            System.out.println("MAS VECES = " + cantidad);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      // ///////////////////////////////////////
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt.executeQuery(
+               "select b.nombre, a.producto_id, sum(cantidad) as cantidad_Total from factura_detalle a\n" +
+                     "inner join producto b\n" +
+                     "on b.id=a.producto_id\n" +
+                     "group by producto_id,b.nombre\n" +
+                     "ORDER BY cantidad_Total desc limit 10;");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String id = rs.getString("producto_id");
+            int cantidad = rs.getInt("cantidad_Total");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("ID = " + id);
+            System.out.println("CANTIDAD TOTAL = " + cantidad);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt.executeQuery(
+               "select b.nombre, a.producto_id, sum(cantidad) as cantidad_Total from factura_detalle a\n" +
+                     "inner join producto b\n" +
+                     "on b.id=a.producto_id\n" +
+                     "group by producto_id,b.nombre\n" +
+                     "ORDER BY cantidad_Total asc limit 10;");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String id = rs.getString("producto_id");
+            int cantidad = rs.getInt("cantidad_Total");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("ID = " + id);
+            System.out.println("CANTIDAD TOTAL = " + cantidad);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt.executeQuery(
+               "select a.nombre, a.apellido, b.fecha_emision, d.nombre as Producto, c.cantidad, e.nombre as Tipo_factura from cliente a\n"
+                     +
+                     "inner join factura b on a.id=b.cliente_id\n" +
+                     "inner join factura_detalle c on c.factura_id = b.id\n" +
+                     "inner join producto d on d.id=c.producto_id\n" +
+                     "inner join factura_tipo e on e.id=b.factura_tipo_id\n" +
+                     "order by b.id");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String apellido = rs.getString("apellido");
+            String fecha = rs.getString("fecha_emision");
+            String producto = rs.getString("producto");
+            String cantidad = rs.getString("cantidad");
+            String factura = rs.getString("Tipo_factura");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("APELLIDO = " + apellido);
+            System.out.println("FECHA FACTURA = " + fecha);
+            System.out.println("PRODUCTO = " + producto);
+            System.out.println("CANTIDAD = " + cantidad);
+            System.out.println("TIPO FACTURA = " + factura);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt
+               .executeQuery("select e.nombre, f.nombre as Tipo_Factura, sum(cantidad*precio) as Monto \n" +
+                     "from factura a\n" +
+                     "inner join Cliente e on e.id=a.cliente_id\n" +
+                     "inner join factura_detalle b on a.id=b.factura_id\n" +
+                     "inner join producto c on c.id=b.producto_id\n" +
+                     "inner join factura_tipo f on f.id=a.factura_tipo_id\n" +
+                     "group by a.id, e.nombre, Tipo_Factura\n" +
+                     "order by Monto desc");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String tipoFactura = rs.getString("Tipo_Factura");
+            String monto = rs.getString("Monto");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("TIPO FACTURA = " + tipoFactura);
+            System.out.println("MONTO = " + monto);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+      try {
+         Statement stmt = c.createStatement();
+         ResultSet rs = stmt
+               .executeQuery("select e.nombre, f.nombre as Tipo_Factura, sum(cantidad*precio)*0.1 as Monto \n" +
+                     "from factura a\n" +
+                     "inner join Cliente e on e.id=a.cliente_id\n" +
+                     "inner join factura_detalle b on a.id=b.factura_id\n" +
+                     "inner join producto c on c.id=b.producto_id\n" +
+                     "inner join factura_tipo f on f.id=a.factura_tipo_id\n" +
+                     "group by a.id, e.nombre, Tipo_Factura\n" +
+                     "order by Monto desc");
+         while (rs.next()) {
+            String nombre = rs.getString("nombre");
+            String tipoFactura = rs.getString("Tipo_Factura");
+            String monto = rs.getString("Monto");
+            System.out.println("NOMBRE = " + nombre);
+            System.out.println("TIPO FACTURA = " + tipoFactura);
+            System.out.println("Monto = " + monto);
+            System.out.println();
+         }
+         rs.close();
+         stmt.close();
+         c.close();
+      } catch (SQLException e) {
+         System.out.println("SQL exception occured" + e);
+      }
+
+   }
+}
\ No newline at end of file