今天主要首次练习JDBC连接,作为新手,真的是花了不少时间,为了然后来着不花费太多时间,走弯路,
首先写上自己的代码,
-
import java.sql.*; -
public class Main { -
public static void main(String[] args) { -
// 1.注册驱动 -
Connection conn = null; -
Statement statement = null; -
ResultSet res = null; -
try { -
Driver driver = new com.mysql.jdbc.Driver(); -
DriverManager.registerDriver(driver); -
// 2.获取数据库连接 -
String url = "jdbc:mysql://localhost:3306/bjnode?characterEncoding=utf8&useSSL=false"; -
// String url = "url=jdbc:mysql://localhost:3306/bjnode/framework?characterEncoding=utf8&useSSL=false"; -
String user = "root"; -
String password = "zmd365236"; -
conn = DriverManager.getConnection(url, user, password); -
// 3.获取数据操作的对象 -
statement = conn.createStatement(); -
// 4.执行SQL语句,DML语句 -
String sql = "select e.ename as name,e.sal as sal ,s.grade " + -
"as grade from emp e join salgrade s on e.sal between " + -
"s.losal and s.hisal"; -
res = statement.executeQuery(sql); -
// 5.处理查询结果集 -
while (res.next()) { -
String enmae = res.getString("name"); -
double sal = res.getDouble("sal"); -
int grade = res.getInt("grade"); -
System.out.println(enmae+" "+sal+" "+grade); -
} -
} catch (SQLException e) { -
e.printStackTrace(); -
} finally { -
if (res != null) { -
try { -
res.close(); -
} catch (SQLException e) { -
e.printStackTrace(); -
} -
} -
} -
} -
}
问题主要有两个,一个是JDBC不被识别,首先要在工程中加载MySQL的jar文件,具体解决方式可以参看http://blog.csdn.net/a153375250/article/details/50851049,基本上市这样的,也可以从Globallib里面添加jar文件,其次就是下面的代码,最后的useSSL=false一定要有,问号前面的内容就是你要访问的数据库的名字,这里特别说明,看很多都知道但是没有说明,容易误解。否侧就有警告,虽然可以出结果,
bjnode?characterEncoding=utf8&useSSL=false