From 18d812e1a2bfcd80c3009eda82a789589ae873f3 Mon Sep 17 00:00:00 2001
From: pbs2h21ash <Malte.Schulze_Hobeling@edu.bib.de>
Date: Mon, 12 Dec 2022 14:03:49 +0100
Subject: [PATCH] moved dbconnection to own class

---
 .../essensbestellungsverwaltung/Database.java | 87 +++++++++++++++++++
 .../HelloApplication.java                     | 36 +-------
 2 files changed, 91 insertions(+), 32 deletions(-)
 create mode 100644 src/main/java/com/bib/essensbestellungsverwaltung/Database.java

diff --git a/src/main/java/com/bib/essensbestellungsverwaltung/Database.java b/src/main/java/com/bib/essensbestellungsverwaltung/Database.java
new file mode 100644
index 0000000..19e3951
--- /dev/null
+++ b/src/main/java/com/bib/essensbestellungsverwaltung/Database.java
@@ -0,0 +1,87 @@
+package com.bib.essensbestellungsverwaltung;
+
+import java.sql.*;
+
+public class Database {
+    private static final String dbLocation = "jdbc:sqlite:"+Database.class.getResource("database/database.db");
+    protected static Connection connect(){
+        Connection conn = null;
+        try{
+            conn = DriverManager.getConnection(dbLocation);
+        }catch (SQLException e){
+            e.printStackTrace();
+        }
+        return conn;
+    }
+
+    protected static void createDb(){
+        String sql = """
+                CREATE TABLE IF NOT EXISTS user (
+                id integer PRIMARY KEY,
+                name text);""";
+        try(Connection conn = connect(); Statement stmt = conn.createStatement()){
+            stmt.execute(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    protected static void fillSampleDb(){
+        String sql = """
+                INSERT INTO user (id,name)
+                VALUES (1,'test1');""";
+        try(Connection conn = connect(); Statement stmt = conn.createStatement()){
+            stmt.execute(sql);
+        }catch (SQLException e){
+            e.printStackTrace();
+        }
+    }
+
+    protected static void printSampleQuery(){
+        String sql = """
+                SELECT * FROM user WHERE id > ?;""";
+        try(Connection conn = connect()){
+            PreparedStatement pstmt = conn.prepareStatement(sql);
+            pstmt.setInt(1,0);
+            ResultSet rs = pstmt.executeQuery();
+            while (rs.next()){
+                System.out.println(rs.getInt("id"));
+                System.out.println(rs.getString("name"));
+            }
+        }catch (SQLException e){
+            e.printStackTrace();
+        }
+    }
+
+    protected static void deleteSample(){
+        String sql = """
+                DELETE FROM user WHERE id = ?;""";
+        try(Connection conn = connect();PreparedStatement pstmt = conn.prepareStatement(sql)){
+            pstmt.setInt(1,1);
+            pstmt.executeUpdate();
+        }catch (SQLException e){
+            e.printStackTrace();
+        }
+    }
+
+    /*        String sql = """
+                CREATE TABLE IF NOT EXISTS user (
+                id integer PRIMARY KEY,
+                name text);""";
+        String sql2 = "SELECT * FROM user WHERE id > ?";
+        String sql3 = "INSERT INTO user (id,name) VALUES (1,'test1')";
+        try(Connection conn = connect();
+            Statement stmt = conn.createStatement()){
+            stmt.execute(sql);
+            stmt.execute(sql3);
+            PreparedStatement pstmt = conn.prepareStatement(sql2);
+            pstmt.setInt(1,0);
+            ResultSet rs = pstmt.executeQuery();
+            while (rs.next()){
+                System.out.println(rs.getInt("id"));
+            }
+        }catch (SQLException e){
+            e.printStackTrace();
+            return;
+        }   */
+}
diff --git a/src/main/java/com/bib/essensbestellungsverwaltung/HelloApplication.java b/src/main/java/com/bib/essensbestellungsverwaltung/HelloApplication.java
index 163a374..dcab265 100644
--- a/src/main/java/com/bib/essensbestellungsverwaltung/HelloApplication.java
+++ b/src/main/java/com/bib/essensbestellungsverwaltung/HelloApplication.java
@@ -6,10 +6,8 @@ import javafx.scene.Scene;
 import javafx.stage.Stage;
 
 import java.io.IOException;
-import java.sql.*;
 
 public class HelloApplication extends Application {
-    private static final String dbLocation = "jdbc:sqlite:"+HelloApplication.class.getResource("database/database.db");
     @Override
     public void start(Stage stage) throws IOException {
         FXMLLoader fxmlLoader = new FXMLLoader(HelloApplication.class.getResource("hello-view.fxml"));
@@ -20,36 +18,10 @@ public class HelloApplication extends Application {
     }
 
     public static void main(String[] args) {
-/*        String sql = """
-                CREATE TABLE IF NOT EXISTS user (
-                id integer PRIMARY KEY,
-                name text);""";
-        String sql2 = "SELECT * FROM user WHERE id > ?";
-        String sql3 = "INSERT INTO user (id,name) VALUES (1,'test1')";
-        try(Connection conn = connect();
-            Statement stmt = conn.createStatement()){
-            stmt.execute(sql);
-            stmt.execute(sql3);
-            PreparedStatement pstmt = conn.prepareStatement(sql2);
-            pstmt.setInt(1,0);
-            ResultSet rs = pstmt.executeQuery();
-            while (rs.next()){
-                System.out.println(rs.getInt("id"));
-            }
-        }catch (SQLException e){
-            e.printStackTrace();
-            return;
-        }   */
+        Database.createDb();
+        Database.fillSampleDb();
+        Database.printSampleQuery();
+        Database.deleteSample();
         launch();
     }
-
-    private static Connection connect(){
-        Connection conn = null;
-        try{
-            conn = DriverManager.getConnection(dbLocation);
-        }catch (SQLException e){
-            e.printStackTrace();
-        }
-        return conn;
-    }
 }
\ No newline at end of file