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src/Hinzufügen.java

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+import javax.swing.*;
+import javax.swing.table.DefaultTableModel;
+import java.awt.event.*;
+import java.sql.*;
+
+public class Hinzufügen extends JFrame implements ActionListener {
+    JButton a = null;
+    ResultSetMetaData rm = null;
+
+
+    JButton einf = null;
+
+    JTable table = null;
+    DefaultTableModel t = null;
+
+    String url = "jdbc:mariadb://127.0.0.1:3306/bundesliga";
+
+    String spalten = "";
+    String sname = "";
+
+    public Hinzufügen(ResultSet r, String tab) {
+        this.setSize(500, 600);
+        this.setLayout(null);
+
+
+        String[][] temp = {{""}};
+        t = new DefaultTableModel();
+        table = new JTable(t);
+
+        a = new JButton("Zurück");
+        a.setBounds(50, 30, 80, 50);
+        a.addActionListener(e -> {
+            this.dispose();
+        });
+        this.add(a);
+
+        try {
+            rm = r.getMetaData();
+            int x = 10;
+            int y = 100;
+            JTextField[] b = new JTextField[rm.getColumnCount()];
+            int z = rm.getColumnCount();
+            for (int i = 2; i <= z; i++) {
+                int w = 90;
+                JLabel a = new JLabel(rm.getColumnName(i));
+                a.setBounds(x, y, w, 60);
+                b[i - 1] = new JTextField();
+                b[i - 1].setBounds(x, y + 70, w, 70);
+                this.add(b[i - 1]);
+                this.add(a);
+                x = x + w;
+                if (x >= 400) {
+                    x = 10;
+                    y = 300;
+                }
+            }
+            einf = new JButton("Einfügen");
+            einf.setBounds(50, 480, 100, 50);
+            einf.addActionListener(e -> {
+                for (int i = 1; i < z; i++) {
+                    try {
+                        System.out.println(b[i].getText());
+                        if (b[i].getText().length() == 0) {
+                            int response = JOptionPane.showConfirmDialog(null, "Soll der Wert für " + rm.getColumnName(i + 1) + " 'NULL' übernommen werden?", "Bestätigen", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
+                            System.out.println(response);
+                            if (response == 0) {
+                                //null
+                            } else {
+                                break;
+                            }
+                        }
+
+                        if (i == z -1) {
+                            spalten = spalten + "'" + b[i].getText() + "'";
+                            sname =sname+rm.getColumnName(i+1);
+                        } else {
+                            spalten = spalten + "'" + b[i].getText() + "',";
+                            sname =sname+rm.getColumnName(i+1)+",";
+                        }
+
+
+                    } catch (Exception ex) {
+                        throw new RuntimeException(ex);
+                    }
+                }
+                System.out.println(sname);
+                System.out.println(spalten);
+                String sql = "Insert into " + tab + "("+sname+") Values (" + spalten + ")";
+                Connection conn = null;
+                try {
+                    conn = DriverManager.getConnection(url, "root", "");
+                    Statement s = conn.createStatement();
+                    ResultSet a = s.executeQuery(sql);
+                    this.dispose();
+                   // Tabellen.this.remove(table);
+                    Tabellen.einfügen(tab);
+                    Tabellen.table.repaint();
+                } catch (SQLException ex) {
+                    throw new RuntimeException(ex);
+                }
+
+
+
+            });
+            this.add(einf);
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+
+    }
+}