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【Java】 JAVA连接数据库

作者:红桃L / 发布于2014/5/20/ 478


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

	
	public class DB {
	public static void main(String[] args) {
	 String url = "jdbc:mysql://localhost:3306/test";
	 String user = "root";
	 String passwd = "123456";
	 String sql1 = "SELECT * FROM score";
	 String sql2 = "INSERT INTO score VALUES(25,905,'ENGLISH',84);";
	 String sql3 = "UPDATE score SET grade=80 WHERE id=25";
	 try {
	 Class.forName("com.mysql.jdbc.Driver");
	 Connection con = DriverManager.getConnection(url, user, passwd);
	 System.out.println("数据库连接成功！");
	 Statement stat = con.createStatement();
	 ResultSet rs = stat.executeQuery(sql1);
	 while(rs.next()){
	 int id = rs.getInt("id");
	 int stu_id = rs.getInt("stu_id");
	 String course = rs.getString("c_name");
	 int grade = rs.getInt("grade");
	 System.out.println(id + " " + stu_id + " " + course + " " + grade);
	 }
	 int i = stat.executeUpdate(sql2);
	 if(i != 0){
	 System.out.println("INSERT语句执行成功!");
	 }
	 int j = stat.executeUpdate(sql3);
	 if(j != 0){
	 System.out.println("UPDATE语句执行成功!");
	 }
	 if(rs != null){
	 rs.close();
	 rs = null;
	 }
	 if(stat != null){
	 stat.close();
	 stat = null;
	 }
	 if(con != null){
	 con.close();
	 con = null;
	 }
	 } catch (ClassNotFoundException e) {
	 // TODO Auto-generated catch block
	 System.out.println("没有找到数据库驱动！");
	 } catch (SQLException e) {
	 // TODO Auto-generated catch block
	 System.out.println("连接数据库服务器失败！");
	 }
	}
	}

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