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package cn.ytu.mybatis.jdbc; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.Collection; public class JdbcTest { public static void main(String[] args){ Connection connection = null ; PreparedStatement preparedStatement = null ; ResultSet resultSet = null ; try { //加载数据库驱动 Class.forName( "com.mysql.jdbc.Driver" ); //通过驱动管理类获取数据连接 connection = DriverManager.getConnection( "jdbc:mysql://localhost:3306/yanda?characterEncodeing=utf-8" , "root" , "123456" ); //定义sql语句?表示占位符 String sql = "select * from user where username = ?" ; //获取预处理的statement preparedStatement = connection.prepareStatement(sql); //设置参数,第一个参数为sql语句中参数的序号(从1开始),第二个参数为设置的参数值 preparedStatement.setString( 1 , "王五" ); //向数据库发出sql执行查询,查询出结果集 resultSet = preparedStatement.executeQuery(); //遍历查询结果集 while (resultSet.next()){ System.out.println(resultSet.getString( "id" )+ " " +resultSet.getString( "username" )); } } catch (Exception e){ e.printStackTrace(); } finally { //释放资源 if (resultSet != null ){ try { resultSet.close(); } catch (SQLException e){ e.printStackTrace(); } } } if (preparedStatement != null ){ try { connection.close(); } catch (SQLException e){ e.printStackTrace(); } } if (connection != null ){ try { connection.close(); } catch (SQLException e){ e.printStackTrace(); } } } } |
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原文地址:http://www.cnblogs.com/litao0505/p/5793711.html