package javacrud;

import java.math.BigDecimal;

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JOptionPane;

/**
 *
 * @author SEEDAGX
 */
public class JavaCRUD extends javax.swing.JFrame {
    
    //変数定義
    Connection conn = null;
    PreparedStatement ps = null;
    ResultSet rs = null;

    //DB接続情報を設定する
    String path = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";  // 接続パス
    String id = "scott"; //ログインID
    String pw = "tiger"; //ログインパスワード

    /** Creates new form JavaCRUD */
    public JavaCRUD() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    private void initComponents() {//GEN-BEGIN:initComponents

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("EmpId");

        jLabel2.setText("EmpName");

        jLabel3.setText("EmpDesgn");

        jLabel4.setText("EmpSalary");

        jButton1.setText("SELECT");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });

        jButton2.setText("INSERT");
        jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton2MouseClicked(evt);
            }
        });

        jButton3.setText("UPDATE");
        jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton3MouseClicked(evt);
            }
        });

        jButton4.setText("DELETE");
        jButton4.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton4MouseClicked(evt);
            }
        });

        jButton5.setText("RESET");
        jButton5.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton5MouseClicked(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(66, 66, 66)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jButton1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jButton2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jButton3)
                        .addGap(18, 18, 18)
                        .addComponent(jButton4)
                        .addGap(18, 18, 18)
                        .addComponent(jButton5))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel4)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                .addComponent(jLabel1)
                                .addComponent(jLabel2)))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addComponent(jTextField2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 262, Short.MAX_VALUE)
                            .addComponent(jTextField1, javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jTextField4)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, 261, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(115, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(44, 44, 44)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(20, 20, 20)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(39, 39, 39)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3)
                    .addComponent(jButton4)
                    .addComponent(jButton5))
                .addContainerGap(36, Short.MAX_VALUE))
        );

        pack();
    }//GEN-END:initComponents

    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton1MouseClicked
        // TODO add your handling code here:
        //SQL文を定義する
        String sql = "SELECT * FROM EmployeeDetails WHERE EmpId = ?";
        
        try {
            //JDBCドライバをロードする
            Class.forName("oracle.jdbc.driver.OracleDriver");

            //DBへのコネクションを作成する
            conn = DriverManager.getConnection(path, id, pw);            
            
            //実行するSQL文とパラメータを指定する
            ps = conn.prepareStatement(sql);
            
            // idに対して値を代入する。この「1」というのは、1番目のバインド変数idを指す。
            int iempid = Integer.parseInt(jTextField1.getText());
            ps.setInt(1, iempid);

            //SELECTを実行する
            rs = ps.executeQuery();

            //取得した結果を全件出力する
            while(rs.next()) {
                jTextField1.setText(String.valueOf(rs.getInt("EmpId")));
                jTextField2.setText(rs.getString("EmpName"));
                jTextField3.setText(rs.getString("EmpDesgn"));
                jTextField4.setText(String.valueOf(rs.getFloat("EmpSalary")));
            }
            
        } catch(Exception ex) {
            //例外発生時の処理
            ex.printStackTrace();  //エラー内容をコンソールに出力する
        } finally {
            //クローズ処理
            if(rs != null) {
                try {
                    rs.close();
                    if(ps != null) ps.close();
                    if(conn != null) conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }//GEN-LAST:event_jButton1MouseClicked

    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton2MouseClicked
        // TODO add your handling code here:
        //SQL文を定義する
        String sql = "INSERT INTO EmployeeDetails VALUES(?, ?, ?, ?)";
        
        try {
            //JDBCドライバをロードする
            Class.forName("oracle.jdbc.driver.OracleDriver");

            //DBへのコネクションを作成する
            conn = DriverManager.getConnection(path, id, pw);            
            
            //実行するSQL文とパラメータを指定する
            ps = conn.prepareStatement(sql);
            
            // idに対して値を代入する。この「1」というのは、1番目のバインド変数idを指す。
            int iempid = Integer.parseInt(jTextField1.getText());
            ps.setInt(1, iempid);
            ps.setString(2, jTextField2.getText());
            ps.setString(3, jTextField3.getText());
            BigDecimal dempsal = new BigDecimal(jTextField4.getText());
            ps.setBigDecimal(4, dempsal);

            //SELECTを実行する
            rs = ps.executeQuery();
            
        } catch(Exception ex) {
            //例外発生時の処理
            ex.printStackTrace();  //エラー内容をコンソールに出力する
        } finally {
            //クローズ処理
            if(rs != null) {
                try {
                    rs.close();
                    if(ps != null) ps.close();
                    if(conn != null) conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        
        JOptionPane.showMessageDialog(this, "データの挿入が完了しました。", "確認", JOptionPane.INFORMATION_MESSAGE);
        
    }//GEN-LAST:event_jButton2MouseClicked

    private void jButton3MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton3MouseClicked
        // TODO add your handling code here:
        //SQL文を定義する
        String sql = "UPDATE EmployeeDetails SET EmpName = ?, EmpDesgn = ?, EmpSalary = ? WHERE EmpId = ?";
        
        try {
            //JDBCドライバをロードする
            Class.forName("oracle.jdbc.driver.OracleDriver");

            //DBへのコネクションを作成する
            conn = DriverManager.getConnection(path, id, pw);            
            
            //実行するSQL文とパラメータを指定する
            ps = conn.prepareStatement(sql);
            
            // idに対して値を代入する。この「1」というのは、1番目のバインド変数idを指す。            
            ps.setString(1, jTextField2.getText());
            ps.setString(2, jTextField3.getText());
            BigDecimal dempsal = new BigDecimal(jTextField4.getText());
            ps.setBigDecimal(3, dempsal);
            int iempid = Integer.parseInt(jTextField1.getText());
            ps.setInt(4, iempid);

            //SELECTを実行する
            rs = ps.executeQuery();
            
        } catch(Exception ex) {
            //例外発生時の処理
            ex.printStackTrace();  //エラー内容をコンソールに出力する
        } finally {
            //クローズ処理
            if(rs != null) {
                try {
                    rs.close();
                    if(ps != null) ps.close();
                    if(conn != null) conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        
        JOptionPane.showMessageDialog(this, "データの更新が完了しました。", "確認", JOptionPane.INFORMATION_MESSAGE);
        
    }//GEN-LAST:event_jButton3MouseClicked

    private void jButton4MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton4MouseClicked
        // TODO add your handling code here:
        //SQL文を定義する
        String sql = "DELETE EmployeeDetails WHERE EmpId = ?";
        
        try {
            //JDBCドライバをロードする
            Class.forName("oracle.jdbc.driver.OracleDriver");

            //DBへのコネクションを作成する
            conn = DriverManager.getConnection(path, id, pw);            
            
            //実行するSQL文とパラメータを指定する
            ps = conn.prepareStatement(sql);
            
            // idに対して値を代入する。この「1」というのは、1番目のバインド変数idを指す。            
            int iempid = Integer.parseInt(jTextField1.getText());
            ps.setInt(1, iempid);

            //SELECTを実行する
            rs = ps.executeQuery();
            
        } catch(Exception ex) {
            //例外発生時の処理
            ex.printStackTrace();  //エラー内容をコンソールに出力する
        } finally {
            //クローズ処理
            if(rs != null) {
                try {
                    rs.close();
                    if(ps != null) ps.close();
                    if(conn != null) conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        
        JOptionPane.showMessageDialog(this, "データの削除が完了しました。", "確認", JOptionPane.INFORMATION_MESSAGE);
    }//GEN-LAST:event_jButton4MouseClicked

    private void jButton5MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton5MouseClicked
        // TODO add your handling code here:
        jTextField1.setText("");
        jTextField2.setText("");
        jTextField3.setText("");
        jTextField4.setText("");
        
    }//GEN-LAST:event_jButton5MouseClicked

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing
                                                                   .UIManager
                                                                   .getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing
                         .UIManager
                         .setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util
                .logging
                .Logger
                .getLogger(JavaCRUD.class.getName())
                .log(java.util
                         .logging
                         .Level
                         .SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util
                .logging
                .Logger
                .getLogger(JavaCRUD.class.getName())
                .log(java.util
                         .logging
                         .Level
                         .SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util
                .logging
                .Logger
                .getLogger(JavaCRUD.class.getName())
                .log(java.util
                         .logging
                         .Level
                         .SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util
                .logging
                .Logger
                .getLogger(JavaCRUD.class.getName())
                .log(java.util
                         .logging
                         .Level
                         .SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt
            .EventQueue
            .invokeLater(new Runnable() {
                public void run() {
                    new JavaCRUD().setVisible(true);
                }
            });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    // End of variables declaration//GEN-END:variables

}