package com.ru.dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class MySqlHelper { public Connection ct = null; public Statement st = null; private ResultSet rs = null; //数据操作返回rs public ResultSet executeQuery(String sql) { // 创建数据库变量 try { // 加载驱动 Class.forName("com.mysql.jdbc.Driver"); // 连接数据库 ct = DriverManager.getConnection("jdbc:mysql://localhost:3306/ru", "root", "123456"); // 创建表达式 st = ct.createStatement(); // 执行sql语句 rs = st.executeQuery(sql); } catch (Exception e) { e.printStackTrace(); } return rs; } //关闭资源 public void close(ResultSet rs,Statement st,Connection ct){ if (rs != null) { try { rs.close(); } catch (Exception e) { // TODO: handle exception } } else if (st != null) { try { st.close(); } catch (Exception e) { // TODO: handle exception } } else if (ct != null) { try { ct.close(); } catch (Exception e) { // TODO: handle exception } } } }
使用java连接mysql数据库
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