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工具類
工程目錄：
運行截圖：
這個是java連接mysql數據庫的一個簡單學生系統，通過jdbc連接數據庫。
JDBCuntils.
package Student;
import java.io.IOException;
import java.sql.*;
import java.util.Properties;
//數據庫的工具類
public class JDBCuntils {
private static String driver = "";
private static String url = "";
private static String user = "";
private static String password = "";
static {
Properties p = new Properties();
try {
p.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties"));
} catch (IOException e) {
e.printStackTrace();
}
driver = p.getProperty("driver");
url = p.getProperty("url");
user = p.getProperty("user");
password = p.getProperty("password");
/*try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}*/
}
public static Connection getConnection() {
try {
return DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
//釋放的時候要從小到大釋放
//Connection -> Statement --> Resultset
public static void release(ResultSet rs, Statement stmt, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}數據庫配置文件(這個是連接你自己的數據庫的信息，在包里創建就好)
db.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/db3 user=root password=1767737316. #<!-- \u914D\u7F6E\u521D\u59CB\u5316\u5927\u5C0F --> initialSize=6 #<!-- \u914D\u7F6E\u521D\u59CB\u5316\u6700\u5927\u8FDE\u63A5\u6570 --> maxActive=20 #<!-- \u914D\u7F6E\u521D\u59CB\u5316\u6700\u5C0F\u8FDE\u63A5\u6570 --> minIdle=3 #<!-- \u914D\u7F6E\u83B7\u53D6\u8FDE\u63A5\u7B49\u5F85\u8D85\u65F6\u7684\u65F6\u95F4,1\u5206\u949F\u5355\u4F4D\u6BEB\u79D2 --> maxWait=60000
Student.java
package Student;
import java.util.Date;
public class Student {
private int id;
private String name;
private int score;
public Student(int id, String name,int score) {
this.id = id;
this.name = name;
this.score = score;
}
public Student() {
}
public String toString() {
return "Student{" +
"name='" + id + '\'' +
", age=" + name +
", sex='" + score + '\'' +
'}';
}
public int getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getScore() {
return score;
}
public void setScore(Integer score) {
this.score = score;
}
}Studentmannger.java
package Student;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;
/**
* @author fanxf
* @since 2018/4/27 17:06
*/
public class Studentmannger {
private static Connection conn = null;
private static PreparedStatement ps = null;
private static ResultSet rs = null;
/**
* 添加學生數據
*
* @param student
* @return
* @throws SQLException
*/
public static int addStudent(Student student) {
conn = JDBCuntils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("INSERT INTO student (id,`name`,score) VALUES (?, ?, ?)");
ps.setInt(1, student.getId()); //設置第一個參數
ps.setString(2, student.getName()); //設置第二個參數
ps.setInt(3, student.getScore()); //設置第三個參數
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCuntils.release(null, ps, conn); //關閉連接
}
return result;
}
public void add() {
Scanner scan = new Scanner(System.in);
System.out.println("請輸入學生學號");
int id = scan.nextInt();
System.out.println("請輸入學生姓名");
String name = scan.next();
System.out.println("請輸入學生成績");
int score = scan.nextInt();
Student s = new Student(id, name, score);
int flag = addStudent(s);
if (flag > 0) {
System.out.println("添加成功");
} else {
System.out.println("添加失敗");
}
}
/**1
*
* 修改
*
* @param student
* @return
*/
public static int updateStudent(Student student) {
conn = JDBCuntils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("UPDATE student SET id = ?, `name` = ?, score = ? WHERE id = ?");
ps.setInt(1, student.getId()); //設置第一個參數
ps.setString(2, student.getName()); //設置第二個參數
ps.setInt(3, student.getScore()); //設置第三個參數
ps.setInt(4, student.getId());
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCuntils.release(null, ps, conn); //關閉連接
}
return result;
}
public void update() {
Scanner scan = new Scanner(System.in);
System.out.println("請輸入學生id");
int id = scan.nextInt();
System.out.println("請輸入學生姓名");
scan.nextLine();
String name = scan.nextLine();
System.out.println("請輸入學生成績");
int score = scan.nextInt();
Student s = new Student(id, name, score );
int flag = updateStudent(s);
if (flag > 0) {
System.out.println("更新成功");
} else {
System.out.println("更新失敗");
}
}
/**
* 刪除
*
* @param id
* @return
* @throws SQLException
*/
public static void select() throws SQLException {
Scanner scan = new Scanner(System.in);
conn = JDBCuntils.getConnection();
int n;
String sql = "select * from student where id=?";
PreparedStatement ps = conn.prepareStatement(sql);
System.out.println("請輸入要查詢的學號");
n = scan.nextInt();
ps.setInt(1, n);
ResultSet rs = ps.executeQuery();
//將sql語句傳至數據庫，返回的值為一個字符集用一個變量接收
while(rs.next()){ //next（）獲取里面的內容
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getInt(3));
//getString（n）獲取第n列的內容
//數據庫中的列數是從1開始的
}
}
public static int deleteStudent(int id) {
conn = JDBCuntils.getConnection();
int result = 0;
try {
ps = conn.prepareStatement("DELETE FROM student WHERE id = ?");
ps.setInt(1, id); //設置第一個參數
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
JDBCuntils.release(null, ps, conn); //關閉連接
}
return result;
}
public void delete() {
Scanner scan = new Scanner(System.in);
System.out.println("請輸入學生id");
int id = scan.nextInt();
int flag = deleteStudent(id);
if (flag > 0) {
System.out.println("刪除成功");
} else {
System.out.println("刪除失敗");
}
}
public static void main(String[] args) throws SQLException {
System.out.println("************ 歡迎進入學生管理系統 *************");
Studentmannger ms = new Studentmannger();
boolean b = true;
while (b) {
System.out.println("你想進行以下哪項操作");
System.out.println("1、添加學生 2、更新學生數據 3、學生信息查詢 4、刪除學生 0、退出");
Scanner scan = new Scanner(System.in);
int i = scan.nextInt();
switch (i) {
case 1:
ms.add();
break;
case 2:
ms.update();
break;
case 3:
ms.select();
break;
case 4:
ms.delete();
break;
default:
System.out.println("沒有該操作選項,請重新來過！");
main(args);
break;
}
}
}
}
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