JDBC应用实例

package cjx913;

public class Student {

private int id;
private String name;

public Student() {
super();
}

public Student(int id, String name) {
super();
this.id = id;
this.name = name;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + "]";
}

}

package cjx913;

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.ArrayList;
import java.util.List;

public class test {
/**
* 使用SQLite数据库
*/
private static String sqlDriver = "org.sqlite.JDBC" ;
private static Connection conn = null;
private static String url = "jdbc:sqlite:E:/SQLite3/StudentManageSystem.db";

/**
* 使用Oracle数据库
* String sqlDriver = "oracle.jdbc.driver.OracleDriver" ;// 加载Oracle驱动程序
* String url = "jdbc:oracle:thin:@" + "host:port:databaseName"; // 连接使用的url
* String user = "your database userName"; // 数据库用户名
* String password = "your database password"; // 密码
* conn = DriverManager.getConnection(url, user, password);// 获取连接
*
*/

/**
* 使用MySQL数据库
* String sqlDriver = "com.mysql.jdbc.Driver" ;
* String url = "jdbc:mysql://host:port:databaseName";
* String username = "your database userName";
* String password = "your database password";
*/

public static void main(String[] args) {

List<Student> list = fetchData();
for(Student e:list){
System.out.println(e);
}

Student stu = login(2,"b");
if(stu!=null){
System.out.println("logined succeed"+"\n当前登录的用户是："+stu.getName());
}else{
System.out.println("logined failed");
}
//System.out.println(stu);

//register(6, "f");
//register(7, "g");
}

public static void register(int id,String name){
try {
Class.forName(sqlDriver);
conn = DriverManager.getConnection(url);//用Oracle数据库和MySQL数据库有用户和密码要输入
PreparedStatement ps = conn.prepareStatement("INSERT INTO Student VALUES(?,?)");
ps.setInt(1, id);
ps.setString(2, name);
ps.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

}
public static Student login(int id,String name){
Student student = null;
try {
Class.forName(sqlDriver);
conn = DriverManager.getConnection(url);
PreparedStatement ps = conn.prepareStatement("SELECT * FROM Student WHERE id=? AND name=?");
ps.setInt(1, id);
ps.setString(2, name);
ResultSet rs = ps.executeQuery();
if(rs.next()){
student = new Student(rs.getInt(1), rs.getString(2));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

return student;
}

public static List<Student> fetchData() {
List<Student> list = new ArrayList<Student>();
Student student = null;
try {
Class.forName(sqlDriver);
conn = DriverManager.getConnection(url);
Statement sm = conn.createStatement();
String sel = "SELECT * FROM Student";
ResultSet rs = sm.executeQuery(sel);
while (rs.next()) {
student = new Student(rs.getInt(1), rs.getString(2));
list.add(student);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return list;
}
}