JDBC学习日记

导入MYSQLjar包，配置环境
连接数据库：
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class DBUitl {
//建三个常量来存放地址用户名还有密码。
private static final String URL="jdbc:mysql://127.0.0.1:3306/imooc?useUnicode=true&characterEncoding=utf-8";
private static final String USER="root";
private static final String PASSWORD="root";
public static void main(String[] args) throws Exception {
//1.加载驱动程序
Class.forName("com.mysql.jdbc.Driver");//通过一个类名反向的加载到我们环境中
//2.获得数据库的连接
Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
//通过数据库连接操作数据库，实现增删改查
Statement stmt = conn.createStatement();
ResultSet rs = (ResultSet) stmt.executeQuery("select user_name,age from imooc_goddess");
while(rs.next()){
System.out.println(rs.getString("user_name")+","+rs.getInt("age"));
}
}