jdbc增删改查

1.从学生表中查询所有信息，并在控制台显示。

import java.sql.*;

public class Query1 {

public static void main(String[] args) {

//指定驱动，得到数据库连接

try{

String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

//创建执行语句对象

Statement stmt=conn.createStatement();

//执行SQL语句，得到结果

String sql="select * from stuInfo";

ResultSet rs=stmt.executeQuery(sql);

//处理结果集}

while(rs.next()){

String stuNo=rs.getString("stuNo");

String stuName=rs.getString("stuName");

int stuAge=rs.getInt("stuAge");

String stuSex=rs.getString("stuSex");

String stuClass=rs.getString("stuClass");

System.out.println(stuNo+""+stuName+""+stuAge+""+stuSex+""+stuClass);

} //关闭连接

rs.close();

stmt.close();

conn.close();

}catch(Exception ex){

System.out.println(ex);

}

}

}

2.插入行：

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

public class Insert1 {

public static void main(String[] args) {

try{

String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

Statement stmt=conn.createStatement();

String sql="insert into stuInfo values('2009007','李四','18','男','09会计')";

int i=stmt.executeUpdate(sql);

if(i==1)System.out.println("插入成功");

stmt.close();

conn.close();

}catch(Exception ex){

System.out.println(ex);

}

}

}

3.修改：

package chap1;

import java.sql.*;

public class Update2 {

public static void main(String[] args) {

try{

String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

Statement stmt=conn.createStatement();

String sql="update stuInfo set stuSex='女' where stuName='李四'";

int i=stmt.executeUpdate(sql);

System.out.println("修改了"+i+"行");

stmt.close();

conn.close();

}catch(Exception ex){

System.out.println(ex);

}

}

}

4.删除行：

package chap1;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.Statement;

public class delete3 {

public static void main(String[] args) {

try{

String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

Statement stmt=conn.createStatement();

String sql="delete from stuInfo where stuName='李四'";

int i=stmt.executeUpdate(sql);

System.out.println("删除了"+i+"行");

stmt.close();

conn.close();

}catch(Exception ex){

System.out.println(ex);

}

}

}

5. java中的数据库：

package chap1;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

public class insert2 {

public static void main(String[] args) {

try{

String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

Statement stmt=conn.createStatement();

String s1="00000002";

String sql="insert into stuInfo values('"+s1+"','李四','18','男','09会计')";

int i=stmt.executeUpdate(sql);

System.out.println("插入"+i+"行");

stmt.close();

conn.close();

}catch(Exception ex){

System.out.println(ex);

}

}

}

二、实现学生注册界面的“注册”按钮的事件处理，添加学生信息到数据库中。

1.注册：

package yin;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.sql.*;

public class Register{

JFrame f;

Container con;

JPanel p1;

JLabel lab1,lab2,lab3,lab4,lab5;

JTextField t1,t2,t3;

JRadioButton rb1,rb2;

JComboBox cbo;

JButton b1,b2;

public Register(){

 f=new JFrame("学生注册窗口");

 con=f.getContentPane();

  

 p1=new JPanel();

 p1.setLayout(new FlowLayout());

         lab1=new JLabel("学号");

         lab2=new JLabel("姓名");

         lab3=new JLabel("年龄");

         lab4=new JLabel("性别           ");

         lab5=new JLabel("班级         ");

         t1=new JTextField("",12);

         t2=new JTextField("",12);

         t3=new JTextField("",12);

 rb1=new JRadioButton("男    ",true);

         rb2=new JRadioButton("女    ");

 ButtonGroup bg=new ButtonGroup( );

 bg.add(rb1);

 bg.add(rb2);

         String[] banji={"08电商一班","08电商二班","08计算机一班","08计算机二班"};

 cbo=new JComboBox(banji);

     

     b1=new JButton("注册");

 b1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

{

             String sno=t1.getText();

             String sname=t2.getText();

             int age=Integer.parseInt(t3.getText());

             String sex;

             if(rb1.isSelected()){

             sex="男";

             }else{

             sex="女";

             }

            String edu=""+cbo.getSelectedItem();

            try{

            String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

                 Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

                 Statement stmt=conn.createStatement();

                 String sql="insert into stuInfo values('"+sno+"','"+sname+"','"+age+"','"+sex+"','"+edu+"')";

                 int i=stmt.executeUpdate(sql);

                 if(i==1)

                 JOptionPane.showMessageDialog(null, "注册成功");

                 stmt.close();

                 conn.close();

                 }catch(Exception ex){

                 System.out.println(ex);

                 }

}

 });

     b2=new JButton("取消");

 b2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

{

System.exit(0);

             

}

 });

     p1.add(lab1);

 p1.add(t1);

     p1.add(lab2);

     p1.add(t2);

     p1.add(lab3);

 p1.add(t3);

     p1.add(lab4);

     p1.add(rb1);

 p1.add(rb2);

 p1.add(lab5);

 p1.add(cbo);     

 p1.add(b1);

 p1.add(b2);

  con.add(p1);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        f.setSize(200,250);

    f.setResizable(false);

f.setVisible(true);

 }

     public static void main(String[] args){

    

  

new Register();     

   }

}

2.查询：

package yin;

import java.sql.*;

public class Query {

public static void main(String[] args) {

try{

String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

Statement stmt=conn.createStatement();

            String sql="select * from stuInfo";

            ResultSet rs=stmt.executeQuery(sql);

            while(rs.next()){

            String stuNo=rs.getString("stuNo");

            String stuName=rs.getString("stuName");

            String stuSex=rs.getString("stuSex");

            int stuAge=rs.getInt("stuAge");

            String stuClass=rs.getString("stuClass");

            System.out.println(stuNo+" "+stuName+" "+stuAge+" "+stuSex+" "+stuClass);

            } rs.close();

            stmt.close();

            conn.close();

}catch(Exception ex){

        System.out.println(ex);

        }

}

}

3.清空：

package yin;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.sql.*;

public class Register{

JFrame f;

Container con;

JPanel p1;

JLabel lab1,lab2,lab3,lab4,lab5;

JTextField t1,t2,t3;

JRadioButton rb1,rb2;

JComboBox cbo;

JButton b1,b2;

public Register(){

 f=new JFrame("学生注册窗口");

 con=f.getContentPane();

  

 p1=new JPanel();

 p1.setLayout(new FlowLayout());

         lab1=new JLabel("学号");

         lab2=new JLabel("姓名");

         lab3=new JLabel("年龄");

         lab4=new JLabel("性别           ");

         lab5=new JLabel("班级         ");

         t1=new JTextField("",12);

         t2=new JTextField("",12);

         t3=new JTextField("",12);

 rb1=new JRadioButton("男    ",true);

         rb2=new JRadioButton("女    ");

 ButtonGroup bg=new ButtonGroup( );

 bg.add(rb1);

 bg.add(rb2);

         String[] banji={"08电商一班","08电商二班","08计算机一班","08计算机二班"};

 cbo=new JComboBox(banji);

     

     b1=new JButton("注册");

 b1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

{

             String sno=t1.getText();

             String sname=t2.getText();

             int age=Integer.parseInt(t3.getText());

             String sex;

             if(rb1.isSelected()){

             sex="男";

             }else{

             sex="女";

             }

            String edu=""+cbo.getSelectedItem();

            try{

            String DBURL = "jdbc:sqlserver://localhost:1433;DataBaseName=student";

                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

                 Connection conn = DriverManager.getConnection(DBURL,"sa","sa");

                 Statement stmt=conn.createStatement();

                 String sql="insert into stuInfo values('"+sno+"','"+sname+"','"+age+"','"+sex+"','"+edu+"')";

                 int i=stmt.executeUpdate(sql);

                 if(i==1){

                 JOptionPane.showMessageDialog(null, "注册成功");

                 }

                 conn.close();

                 t1.setText("");

                 t2.setText("");

                 t3.setText("");

                 rb1.setSelected(true);

                 cbo.setSelectedIndex(0);

                 }catch(Exception ex){

                 ex.printStackTrace();

                 }

}

 });

     b2=new JButton("取消");

 b2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e)

{

System.exit(0);

             

}

 });

     p1.add(lab1);

 p1.add(t1);

     p1.add(lab2);

     p1.add(t2);

     p1.add(lab3);

 p1.add(t3);

     p1.add(lab4);

     p1.add(rb1);

 p1.add(rb2);

 p1.add(lab5);

 p1.add(cbo);     

 p1.add(b1);

 p1.add(b2);

  con.add(p1);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        f.setSize(200,250);

    f.setResizable(false);

f.setVisible(true);

 }

     public static void main(String[] args){

    

  

new Register();     

   }

}

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