用Java连接SQL SERVER数据库 GUI实现查询

数据库是提前建立好的SCT数据库；
分成Frame.java 和Main.java,SCT.java
开工！

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Frame.java

import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
 * 
 */
/** 

* @author 作者:拔牙不打麻药 

* @version 创建时间：2020年4月28日 下午10:51:44 

*/

/**
 * @author 拔牙不打麻药
 *
 * @time 2020年4月28日
 */

public class Frame extends JFrame{
	String s;
	Connection conn;
	final String URL="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=SCT";
	final String USER="sa";
	final String PASSWORD="123456";
	Statement st;
	ResultSet rs;
	
	//提示框
	JLabel jl1=new JLabel("请输入要查询的学生姓名和成绩：                                      ");
	JLabel jl2=new JLabel("请输入要查询的教师姓名并显示工资：                              ");
	JLabel jl3=new JLabel("请输入要查询的部门并显示部门的所有老师：                 ");
	JLabel jl4=new JLabel("请输入要删除的部门信息：                                                   ");
	JLabel jl5=new JLabel("请输入要插入的部门信息：                                                   ");
	JLabel jl6=new JLabel("请输入要更新的学生信息：                                                   ");
	
	//文本框
	JTextField jt1=new JTextField(20);
	JTextField jt2=new JTextField(20);
	JTextField jt3=new JTextField(20);
	JTextField jt4=new JTextField(20);
	JTextField jt5=new JTextField(20);
	JTextField jt6=new JTextField(20);
//	JTextField jt7=new JTextField(20);
	
	//按钮
	JButton jb1=new JButton("查询");
	JButton jb2=new JButton("查询");
	JButton jb3=new JButton("查询");
	JButton jb4=new JButton("删除");
	JButton jb5=new JButton("插入");
	JButton jb6=new JButton("更新");
	
	//显示框
	JTextArea jt=new JTextArea("jt");
	
	
	public void createframe() {
		this.setTitle("教务信息管理模块");
		this.setLayout(null);
		this.setLocation(300,100);
		this.setSize(800, 700);
		this.setLayout(null);
		
		//容器
		JPanel jp1=new JPanel();
		JPanel jp2=new JPanel();
		JPanel jp3=new JPanel();
		JPanel jp4=new JPanel();
		JPanel jp5=new JPanel();
		JPanel jp6=new JPanel();
		JPanel jp7=new JPanel();
		//设置容器大小
		jp1.setBounds(10, 10, 700, 60);
		jp2.setBounds(10, 80, 700, 60);
		jp3.setBounds(10, 150, 700, 60);
		jp4.setBounds(10, 220, 700, 60);
		jp5.setBounds(10, 290, 700, 60);
		jp6.setBounds(10, 360, 700, 60);
		jp7.setBounds(10, 400, 700, 160);
		
		//左对齐
		jp1.setLayout(new FlowLayout(FlowLayout.LEFT));
		jp2.setLayout(new FlowLayout(FlowLayout.LEFT));
		jp3.setLayout(new FlowLayout(FlowLayout.LEFT));
		jp4.setLayout(new FlowLayout(FlowLayout.LEFT));
		jp5.setLayout(new FlowLayout(FlowLayout.LEFT));
		jp6.setLayout(new FlowLayout(FlowLayout.LEFT));
		jp7.setLayout(new FlowLayout(FlowLayout.LEFT));
		//加入面板中
		this.add(jp1);
		this.add(jp2);
		this.add(jp3);
		this.add(jp4);
		this.add(jp5);
		this.add(jp6);
		this.add(jp7);
		
		jp1.add(jl1);
		jp1.add(jt1);
		jp1.add(jb1);
		jp2.add(jl2);
		jp2.add(jt2);
		jp2.add(jb2);
		jp3.add(jl3);
		jp3.add(jt3);
		jp3.add(jb3);
		jp4.add(jl4);
		jp4.add(jt4);
		jp4.add(jb4);
		jp5.add(jl5);
		jp5.add(jt5);
		jp5.add(jb5);
		jp6.add(jl6);
		jp6.add(jt6);
		jp6.add(jb6);
		jp7.add(jt);
		this.setVisible(true);
		
		//设置textarea的字体格式
		jt.setFont(new Font("黑体",Font.BOLD,10));
		
		//添加监听事件
		jb1.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
//				Method m=new Method();
//				m.actionPerformed(e);
				if(e.getSource()==jb1) {
					if(jt1.getText().equals("")) {
						JOptionPane.showMessageDialog(null, "Big胆！居然不输入内容！","狗狗提醒您:",JOptionPane.ERROR_MESSAGE);
						jt1.grabFocus();
					}
					else {
						JOptionPane.showMessageDialog(null, "查询成功！建议北大青鸟录取！","古德！",JOptionPane.INFORMATION_MESSAGE);
						s=jt1.getText();
						try {
							Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
							conn=DriverManager.getConnection(URL,USER,PASSWORD);
							String sql="select S1.Sno,S2.Cno,S2.Score From Student S1,SC S2 Where S1.Sno=S2.Sno and S1.Sname='"+s+"'"+"\n";
							st=conn.createStatement();
							rs=st.executeQuery(sql);
							if(rs.next()) {
								jt.setText("该同学的学号为"+rs.getString("Sno")+"，课程:"+rs.getString("Cno")+"，这科成绩为："+rs.getString("Score")+"\n");
							}
						}
						catch(Exception e1) {
							JOptionPane.showMessageDialog(null, "数据库连接失败"+e1.getMessage());
						}
						
					}
				}
				jt1.setText("");
			}
		});
		
		jb2.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(e.getSource()==jb2) {
					if(jt2.getText().equals("")) {
						JOptionPane.showMessageDialog(null, "Big胆！居然不输入内容！","狗狗提醒您:",JOptionPane.ERROR_MESSAGE);
						jt2.grabFocus();
					}
					else {
						JOptionPane.showMessageDialog(null, "查询成功！建议北大录取！","古德！",JOptionPane.INFORMATION_MESSAGE);
						s=jt2.getText();
						try {
							Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
							conn=DriverManager.getConnection(URL,USER,PASSWORD);
							String sql="select t.Tname,c.Cname,c.Cno,t.Salary from Teacher t,Course c where t.Tname='"+s+"' and t.Tno=c.Tno";
							st=conn.createStatement();
							rs=st.executeQuery(sql);
							if(rs.next()) {
								jt.setText("老师的姓名为"+rs.getString("Tname")+"，教授的课程为："+rs.getString("Cname")+"，课程代码为："+rs.getString("Cno")+"，工资为:"+rs.getString("Salary")+'\n');
							}
						}
						catch(Exception e1) {
							JOptionPane.showMessageDialog(null, "数据库连接失败"+e1.getMessage());
						}
						jt2.setText("");
					}
				}
			}
		});
		
		jb3.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(e.getSource()==jb3) {
					if(jt3.getText().equals("")) {
						JOptionPane.showMessageDialog(null, "Big胆！居然不输入内容！","狗狗提醒您:",JOptionPane.ERROR_MESSAGE);
						jt3.grabFocus();
					}
					else {
						JOptionPane.showMessageDialog(null, "查询成功！建议北大录取！","古德！",JOptionPane.INFORMATION_MESSAGE);
						s=jt3.getText();
						try {
							Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
							conn=DriverManager.getConnection(URL,USER,PASSWORD);
							String sql="select d.Dname, t.Tname from Dept d,Teacher t where d.Dname='"+s+"' and d.Dno=t.Dno;";
							st=conn.createStatement();
							rs=st.executeQuery(sql);
							if(rs.next()) {
								jt.setText("该部门为"+rs.getString("Dname")+"，老师名为:"+rs.getString("Tname")+'\n');
							}
						}
						catch(Exception e1) {
							JOptionPane.showMessageDialog(null, "数据库连接失败"+e1.getMessage());
						}
						jt3.setText("");
					}
				}
			}
		});
		
		jb4.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(e.getSource()==jb4) {
					if(jt4.getText().equals("")) {
						JOptionPane.showMessageDialog(null, "Big胆！居然不输入内容！","狗狗提醒您:",JOptionPane.ERROR_MESSAGE);
						jt4.grabFocus();
					}
					else {
						JOptionPane.showMessageDialog(null, "查询成功！建议北大录取！","古德！",JOptionPane.INFORMATION_MESSAGE);
						s=jt4.getText();
						try {
							Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
							conn=DriverManager.getConnection(URL,USER,PASSWORD);
							//String sql="delete from Dept where Dept.Dname='"+s+"';";
							String sql="select * from Dept where Dname='"+s+"'";
							st=conn.createStatement();
							rs=st.executeQuery(sql);
							if(rs.next()) {
								jt.setText("成功删除"+rs.getString("Dname")+"部门,部门编号为" +rs.getString("Dno")+"部门负责人为 "+rs.getString("Dean")+"\n");
							}
							 sql="delete from Dept where Dept.Dname='"+s+"';";
							 rs=st.executeQuery(sql);
						}
						catch(Exception e1) {
							//JOptionPane.showMessageDialog(null, "数据库连接失败"+e1.getMessage());
						}
						jt4.setText("");
					}
				}
			}
		});
		
		jb5.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(e.getSource()==jb5) {
					if(jt5.getText().equals("")) {
						JOptionPane.showMessageDialog(null, "Big胆！居然不输入内容！","狗狗提醒您:",JOptionPane.ERROR_MESSAGE);
						jt5.grabFocus();
					}
					else {
						JOptionPane.showMessageDialog(null, "查询成功！建议北大录取！","古德！",JOptionPane.INFORMATION_MESSAGE);
						s=jt5.getText();
						try {
							Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
							conn=DriverManager.getConnection(URL,USER,PASSWORD);
							String sql="insert into Dept values('01','"+s+"','周志光');";
							jt.setText("成功插入"+s+"部门！\n");
							String sql1="select * from Dept where Dname='"+s+"'";
							st=conn.createStatement();
							rs=st.executeQuery(sql);
							Statement st1=conn.createStatement();
							ResultSet rs1=st1.executeQuery(sql1);
							
							if(rs1.next()) {
								//jt.setText("成功插入"+rs.getString("Dname")+"部门,部门编号为" +rs.getString("Dno")+"部门负责人为 "+rs.getString("Dean")+"\n");
							
							}
						}
						catch(SQLException e1) {
							//JOptionPane.showMessageDialog(null, "数据库连接失败"+e1.getMessage());
						}
						catch (ClassNotFoundException e1) {
							// TODO Auto-generated catch block
							e1.printStackTrace();
						}
						jt5.setText("");
					}
				}
			}
		});
		
		jb6.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if(e.getSource()==jb6) {
					if(jt6.getText().equals("")) {
						JOptionPane.showMessageDialog(null, "Big胆！居然不输入内容！","狗狗提醒您:",JOptionPane.ERROR_MESSAGE);
						jt6.grabFocus();
					}
					else {
						JOptionPane.showMessageDialog(null, "查询成功！建议北大录取！","古德！",JOptionPane.INFORMATION_MESSAGE);
						s=jt6.getText();
						try {
							Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
							conn=DriverManager.getConnection(URL,USER,PASSWORD);
							String sql="update SC  set SC.Score=SC.Score*0.9 where SC.Sno=(select s.Sno from Student s where s.Sname='"+s+"')";
							jt.setText("更新"+s+"同学的成绩成功！"+'\n');
							st=conn.createStatement();
							rs=st.executeQuery(sql);
						}
						catch(Exception e1) {
							JOptionPane.showMessageDialog(null, "数据库连接失败"+e1.getMessage());
						}
						jt6.setText("");
					}
				}
			}
		});
	}
	
}

Main.java

/**
 * 
 */
/** 

* @author 作者:拔牙不打麻药 

* @version 创建时间：2020年4月29日 下午9:45:23 

*/

/**
 * @author 拔牙不打麻药
 *
 * @time 2020年4月29日
 */

public class main {

	/**
	 * @param args
	 */

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SCT sct=new SCT();
		Frame f=new Frame();
		sct.getConn();
		f.createframe();
		
	}

}

SCT.java

import java.sql.*;

import javax.swing.JApplet;
import javax.swing.JOptionPane;
import javafx.application.Application;
/** 

* @author 作者:拔牙不打麻药 

* @version 创建时间：2020年4月26日 下午4:55:55 

*/
public class SCT {
	private static SCT sct=new SCT();
	public SCT() {
		try {
			//加载驱动程序
			String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
			DriverManager.registerDriver(new com.microsoft.sqlserver.jdbc.SQLServerDriver());
			System.out.println("驱动程序已加载");
		}
		catch(Exception e){
			JOptionPane.showMessageDialog(null, "数据库加载失败"+e.getMessage());
		}
	}
	public static Connection getConn() {
		try{
			final String URL="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=SCT";
			final String USER="sa";
			final String PASSWORD="123456";
			Connection conn=null;
			//获得数据库的连接
			conn=DriverManager.getConnection(URL,USER,PASSWORD);
			System.out.println("已成功连接到数据库");
			return conn;
		}
		catch(Exception e) {
			JOptionPane.showMessageDialog(null, "数据库连接失败"+e.getMessage());
			return null;
		}
	}

}

放一张查询图

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好像还有几个bug，但是能用嘻嘻
竣工！