Java Experiment 4 JDBC
using SQL Server database or MySQL database each client tools, complete the following tasks:
(1) create a database students;
(2) create a table scores in the data students, including the following fields: Student ID, name, sex, score, field type definitions themselves. Student ID as the primary key.
Then write Java programs using JDBC, complete the following tasks:
(1) insert five records in the table scores, on behalf of five students, three boys and two girls, each custom field content ( "score" field fill custom scores) ;
(2) to display all the information 5 students;
(3) the three boys scores minus 5 points, plus the two girls score 3 points;
(4) number from the keyboard input is not the students, according to student number display all information of the corresponding students.
Made the window, the interface is so
1. Install JDBC, arranged SqlServer
Before you can write the reference blog: Java SQL Server database using JDBC connection
Note The version of Java
2. Write the code
File directory is this
two documents,
SqlCode.java
SqlCode.java store static SQL code
/*
* 这里放的是 静态Sql代码
*/
public class SqlCode {
//在数据students中创建表scores
static String createTable = ""
+ "USE students;"
+ "\n"
+ "CREATE TABLE scores"
+ "("
+ "sno int not null,"
+ "name varchar(20) not null,"
+ "ssex varchar(10) CHECK(ssex IN('boy','girl')),"
+ "score int not null,"
+ "PRIMARY KEY(sno),"
+ ")";
//在表格scores插入5条记录
static String insertValues = ""
+ "USE students"
+ "\n"
+ "INSERT INTO scores(sno,name,ssex,score) VALUES(1,'DaWang','boy','61')"
+ "\n"
+ "INSERT INTO scores(sno,name,ssex,score) VALUES(2,'ErWang','girl','62')"
+ "\n"
+ "INSERT INTO scores(sno,name,ssex,score) VALUES(3,'SanWang','boy','63')"
+ "\n"
+ "INSERT INTO scores(sno,name,ssex,score) VALUES(4,'siWang','girl','65')"
+ "\n"
+ "INSERT INTO scores(sno,name,ssex,score) VALUES(5,'wuWang','girl','66')";
//显示5位学生的所有信息
static String queryString = ""
+ "USE students"
+ "\n"
+ "SELECT TOP 5 * FROM scores";
//将三位男生的得分减去5 tucao:男生真累
static String updateScoreBoy = ""
+ "USE students"
+ "\n"
+ "UPDATE scores "
+ "\n"
+ "SET score = score - 5"
+ "\n"
+ "WHERE ssex = 'boy'"
+ "\n";
//将两位女生的成绩加上3分
static String updateScoreGirl = ""
+ "USE students"
+ "\n"
+ "UPDATE scores "
+ "\n"
+ "SET score = score + 3"
+ "\n"
+ "WHERE ssex = 'girl'"
+ "\n";
//删除某个学号 自己测试数据用的
static String deleteByIdSql = "USE students"
+ "\n"
+ "DELETE FROM scores WHERE sno = ";
}
SqlServerStu.java
SqlServerStu.java file is the master file, use JDBC to operate the database, and finally made the bells and whistles of the window. . A total of 450 lines ( 'ཀ `" ∠)
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.Closeable;
import java.sql.*;
import java.util.Scanner;
import javax.naming.OperationNotSupportedException;
import javax.sound.sampled.Line;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
class sqlServer{
private Connection connection = null; //连接接口实例
private Statement statmment = null; //执行静态sql的接口实例
private PreparedStatement preStatement = null; //执行动态sql的接口实例
private ResultSet resSet = null; //sql查询的返回数据集合
String dbName = "students"; //数据库名
String tbName = "scores"; //数据表名 没必要其实
String url = "jdbc:sqlserver://127.0.0.1:1433"; //sqlserver连接地址url
String userName = "sa"; //sqlserver的账号名 要在SMSS安全性里面设置
String passWord = "root"; //sqlserver的账号的密码 要在SMSS安全性里面设置
//下面就是按课题要求写的一些静态代码(String字符串类型,在SqlCode.java文件中的全局变量)
String createTableSql = SqlCode.createTable;
String insertSql = SqlCode.insertValues;
String queryAllSql = SqlCode.queryString;
String updateBoySql = SqlCode.updateScoreBoy;
String updateGrilSql = SqlCode.updateScoreGirl;
String delByIdSql = SqlCode.deleteByIdSql;
//无参构造函数 初始化建立连接
public sqlServer() {
// TODO Auto-generated constructor stub
try {
//加载数据库驱动
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
//DriverManager接口获取连接
this.connection = DriverManager.getConnection(url,userName,passWord);
//获取 执行数据库静态SQL语法的接口
this.statmment = connection.createStatement();
if(connection != null) {
System.out.println("连接成功!");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//有参构造函数 urlParam初始化建立连接
public sqlServer(String urlParam) {
// TODO Auto-generated constructor stub
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
this.connection = DriverManager.getConnection(urlParam);
this.statmment = connection.createStatement();
if(connection != null) {
System.out.println("连接成功!");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//关闭连接
public void close() throws SQLException {
if(resSet != null) {
resSet.close();
}
if(statmment != null) {
statmment.close();
}
if(preStatement != null) {
preStatement.close();
}
if(connection != null) {
System.out.println("关闭连接!");
connection.close();
}
}
//打印输出 ResultSet集合中的数据
public void rsPrint(ResultSet rS) throws SQLException {
if(rS == null) return;
System.out.println("");
System.out.println("sno"+"| name"+" | ssex"+" | score");
while(rS.next()) {
int sno = rS.getInt("sno");
String name = rS.getString("name");
String ssex = rS.getString("ssex");
int score = rS.getInt("score");
System.out.println(sno+" | "+name+" | "+ssex+" | "+score);
}
}
//返回ResultSet集合
public ResultSet queryBySno(int snoId) throws SQLException {
String queryByIdString = ""
+ "USE students"
+ "\n"
+ "SELECT * FROM scores"
+ "\n"
+ "WHERE scores.sno = ?"
+ "";
this.preStatement = connection.prepareStatement(queryByIdString);
preStatement.setInt(1, snoId);
return preStatement.executeQuery();
}
//查询全部
public ResultSet queryAll(String querySql) throws SQLException {
return statmment.executeQuery(querySql);
}
//创建数据库
public void generalExc(String sql) throws SQLException {
preStatement = connection.prepareStatement(sql);
preStatement.executeUpdate();
}
//创建数据库
public void createDataBase(String dbName) throws SQLException {
String createSql = "CREATE DATABASE "+dbName;
preStatement = connection.prepareStatement(createSql);
// preStatement.setString(1, dbName);
preStatement.executeUpdate();
System.out.println("创建数据库"+dbName+"成功!");
}
//删除数据库
public void delDataBase(String dbName) throws SQLException {
String deleteSql = "DROP DATABASE "+dbName;
preStatement = connection.prepareStatement(deleteSql);
// preStatement.setString(1, dbName);
preStatement.executeUpdate();
System.out.println("删除数据库"+dbName+"成功!");
}
//通过sno学号删除 数据表中的记录
public void delById(int sno) throws SQLException {
preStatement = connection.prepareStatement(delByIdSql + sno);
preStatement.executeUpdate();
System.out.println("删除记录"+"成功!");
}
//创建数据表
public void createTable(String createSql) throws SQLException {
statmment.execute(createSql);
System.out.println("创建数据表"+"成功!");
}
//插入数据到数据表
public void insertValue(String insertSql) throws SQLException {
statmment.execute(insertSql);
System.out.println("删除数据表"+"成功!");
}
//更新数据表中的数据
public void updateValue(String updateSql) throws SQLException {
statmment.execute(updateSql);
System.out.println("更新完成!");
}
//scanner输入指定学号,查询学生信息
public void inputSnoAndQuery() throws SQLException {
Scanner inputScanner = new Scanner(System.in);
int snoId = inputScanner.nextInt();
rsPrint(queryBySno(snoId));
}
//返回值:把ResultSet集合中的数据转换成String类型 (因为后面展示到窗口文本域需要string类型)
public String returnString(ResultSet rS) throws SQLException {
// TODO Auto-generated method stub
StringBuffer myBuffer = new StringBuffer();
int line = 0;
while(rS.next()) {
if(line == 0) {
line++;
myBuffer.append("查询结果如下: "+"\n");
// myBuffer.append("sno"+"| name"+" | ssex"+" | score"+"\n");
}
int sno = rS.getInt("sno");
String name = rS.getString("name");
String ssex = rS.getString("ssex");
int score = rS.getInt("score");
myBuffer.append(sno+" | "+name+" | "+ssex+" | "+score+"\n");
}
if(line == 0) myBuffer.append("");
return myBuffer.toString();
}
}
class window{
//组件
public JFrame sqlWindowFrame;
public JPanel PanelSouth;
public JPanel PanelNorth;
public JTextArea textArea;
public JScrollPane scrollPane;
public JTextField inpuTextField;
//一系列按钮
public JButton customQueryBtn; //执行自定义sql代码的查询按钮
public JButton noResultBtn; //执行没有返回值的sql代码的按钮 比如:create insert delete 这些
public JButton createDBBtn; //创建数据库按钮
public JButton createTBBtn; //创建数据表按钮
public JButton insertBtn; //添加数据按钮
public JButton showBtn; //展示5个学生数据的按钮
public JButton updateBtn; //更新数据的按钮 男-5 女+3
public JButton querySnoBtn; //通过学号查询的按钮
public JLabel labelSouth; //底部标签
public JLabel labelNorth; //顶部标签
public sqlServer myServer; //把sqlServer作为内部类
//窗口构造函数 主要用来初始化组件
public window() {
// TODO Auto-generated constructor stub
this.sqlWindowFrame = new JFrame("by fishers _(´ཀ`」 ∠)_"); //设置窗体 名字为notePad
this.sqlWindowFrame.setLayout(new BorderLayout()); //边界布局方式
this.sqlWindowFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置关闭框
this.sqlWindowFrame.setSize(800,500);
this.textArea = new JTextArea();
this.scrollPane = new JScrollPane(textArea);
this.inpuTextField = new JTextField(30);
this.customQueryBtn = new JButton("执行查询");
this.noResultBtn = new JButton("执行无返回值的sql");
this.createDBBtn = new JButton("创建数据库");
this.createTBBtn = new JButton("创建数据表");
this.insertBtn = new JButton("添加数据");
this.showBtn = new JButton("展示数据");
this.updateBtn = new JButton("更新数据");
this.querySnoBtn = new JButton("查询学号");
this.PanelSouth = new JPanel();
this.PanelNorth = new JPanel();
this.labelSouth = new JLabel("输入sql语法: ");
this.labelNorth = new JLabel("内置功能区: ");
this.myServer = new sqlServer();
textArea.setFont(new Font("宋体",Font.PLAIN,20));
textArea.setEditable(false); //设置文本域组件不可以编辑
itemAdd();
addListen();
}
//添加组件都写在这里
public void itemAdd() {
PanelSouth.add(labelSouth);
PanelSouth.add(inpuTextField);
PanelSouth.add(customQueryBtn);
PanelSouth.add(noResultBtn);
PanelSouth.add(noResultBtn);
PanelNorth.add(labelNorth);
PanelNorth.add(createDBBtn);
PanelNorth.add(createTBBtn);
PanelNorth.add(insertBtn);
PanelNorth.add(showBtn);
PanelNorth.add(updateBtn);
PanelNorth.add(querySnoBtn);
sqlWindowFrame.add(scrollPane,BorderLayout.CENTER);
sqlWindowFrame.add(PanelSouth,BorderLayout.SOUTH);
sqlWindowFrame.add(PanelNorth,BorderLayout.NORTH);
sqlWindowFrame.setVisible(true);
}
//监听方法都写在这里
public void addListen() {
//监听自定义查询按钮
customQueryBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String textString = inpuTextField.getText();
System.out.println(textString);
if(textString != null) {
try {
// myServer.rsPrint(myServer.queryAll(textString));
String queryAns = myServer.returnString(myServer.queryAll(textString));
System.out.println(queryAns);
textArea.setText(queryAns);
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
});
//监听没有返回值的按钮
noResultBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String textString = inpuTextField.getText();
System.out.println(textString);
if(textString != null) {
try {
myServer.generalExc(textString);
textArea.setText("执行完成!");
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
});
//监听创建数据库按钮
createDBBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
try {
myServer.createDataBase("students");
textArea.setText("创建数据库完成!");
} catch (SQLException e1) {
// TODO Auto-generated catch block
textArea.setText("创建数据库失败,请检查语法是否正确!或当前连接已经存在该数据库!");
e1.printStackTrace();
}
}
});
//监听创建数据表的按钮
createTBBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
try {
myServer.createTable(myServer.createTableSql);
textArea.setText("创建数据表完成!");
} catch (SQLException e1) {
textArea.setText("创建数据表失败,请检查语法是否正确!或当前数据库中已经存在该数据表!");
e1.printStackTrace();
}
}
});
//监听插入数据的按钮
insertBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
try {
myServer.insertValue(myServer.insertSql);
textArea.setText("添加数据完成!");
} catch (SQLException e1) {
textArea.setText("添加数据失败,请检查语法是否正确!或当前数据库中已经存在该数据!");
e1.printStackTrace();
}
}
});
//监听展示数据的按钮
showBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
try {
String queryAns = myServer.returnString(myServer.queryAll(myServer.queryAllSql));
System.out.println(queryAns);
textArea.setText(queryAns);
} catch (SQLException e1) {
e1.printStackTrace();
}
}
});
//监听更新数据的按钮
updateBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
try {
myServer.updateValue(myServer.updateBoySql);
myServer.updateValue(myServer.updateGrilSql);
textArea.setText("更新数据完成!");
} catch (SQLException e1) {
// TODO Auto-generated catch block
textArea.setText("更新数据失败,请检查语法是否正确!");
e1.printStackTrace();
}
}
});
//监听通过学号查询数据的按钮
querySnoBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
try {
int sno = Integer.valueOf(inpuTextField.getText());
String queryAns = myServer.returnString(myServer.queryBySno(sno));
// if(queryAns == " " || queryAns == null) queryAns = "未查到该学生信息";
// System.out.println(queryAns);
textArea.setText(queryAns);
} catch (SQLException e1) {
// TODO Auto-generated catch block
textArea.setText("查询失败,请检查语法是否正确");
e1.printStackTrace();
}
}
});
}
}
//主进程启动
public class SqlServerStu {
public static void main(String []args) throws SQLException {
// String urlParam = "jdbc:sqlserver://127.0.0.1:1433?user=sa&password=root"; //这个连接url好像不能用啊
// sqlServer myServer = new sqlServer();
// myServer.createDataBase("students"); //创建数据库
// myServer.createTable(myServer.createTableSql); //创建数据表
// myServer.insertValue(myServer.insertSql); //增
// myServer.rsPrint(myServer.queryAll(myServer.queryAllSql)); //查
// myServer.rsPrint(myServer.queryBySno(2)); //查
// myServer.updateValue(myServer.updateBoySql); //改
// myServer.delById(1); //删
// myServer.rsPrint(myServer.queryAll(myServer.queryAllSql)); //查
// myServer.delDataBase("students"); //删
// myServer.close(); //关闭连接
// myServer.inputSnoAndQuery();
// myServer.updateValue(myServer.updateBoySql);
// myServer.delDataBase("students");
// myServer.createDataBase("qwertest12");
window myWindow = new window(); //最后还是做成了窗口 orz
}
}
//凑够450行Database is also possible to do experiments? ?