JDBC连接mysql 数据库

package cn.edu.njupt.dbconnection;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;


public class DatabaseConnection {

private static final String DBDRIVER = "org.gjt.mm.mysql.Driver";
private static final String DBURL = "jdbc:mysql://localhost:3306/jdbcdemo";
private static final String DBUSER = "root";
private static final String DBPASSWORD = "mysqladmin";
private Connection conn;

public DatabaseConnection(){
try {
Class.forName(DBDRIVER);
this.conn = DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}

public Connection getConnection(){
return this.conn;
}

public void close(){
if(this.conn != null){
try {
this.conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
String sql = "create table student(id varchar(5),name varchar(20),primary key(id));";
try {
PreparedStatement pstmt = new DatabaseConnection().getConnection().prepareStatement(sql);
int result = pstmt.executeUpdate();
if(result != -1){//创建成功
System.out.println("数据库 创建 成功");
String sql1 = "insert into student(id,name) values(1,'张三')";
int r1 = pstmt.executeUpdate(sql1);
System.out.println("数据插入 r1 成功");
String sql2 = "insert into student(id,name) values(2,'李四')";
int r2 = pstmt.executeUpdate(sql2);
System.out.println("数据插入 r2 成功");
String sql3 = "select * from student";
ResultSet rs = pstmt.executeQuery(sql3);
System.out.println("学号\t姓名");
while(rs.next()){
System.out.println(rs.getString(1)+"\t"+rs.getString(2));
}
}
new DatabaseConnection().close();
} catch (SQLException e) {
e.printStackTrace();
}
}

}