//DBUtils 工具类,简化了JDBC的操作 //QueryRunner 实现增加、删除、修改操作 import day02.JdbcUtils3; import day03.Student; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanHandler; import org.apache.commons.dbutils.handlers.BeanListHandler; import java.sql.Connection; import java.sql.SQLException; import java.util.List; public class CRUD { //创建一个全局的QueryRunner对象 private static QueryRunner qr=new QueryRunner(); //学员信息添加的方法 public static void insert(){ //获取Connection对象 try(Connection con= JdbcUtils3.getConnection();){ //准备执行的SQL语句 String sql="insert into student(name,age,Gender,birthday)values(?,?,?,?)"; Object[]prams={"桑凤娇",22,"女","2000-09-20"}; int i=qr.update(con,sql,prams); if(i>0){ System.out.println("学员信息添加成功"); }else{ System.out.println("学员信息添加失败"); } }catch(SQLException ce){ ce.printStackTrace(); } } //学员信息删除的方法 public static void delete(){ //获取Connection对象 try(Connection con=JdbcUtils3.getConnection()){ //准备SQL语句 String sql="delete from student where id=?"; Object[]prams={4}; int i=qr.update(con,sql,prams); if(i>0){ System.out.println("删除成功"); }else{ System.out.println("删除失败"); } }catch(SQLException ce){ ce.printStackTrace(); } } //学员信息修改的方法 public static void update(){ //获取Connection对象 try(Connection con=JdbcUtils3.getConnection()){ //SQl语句 String sql="update student set name=?,age=?,Gender=?,birthday=? where id=?"; Object[]prams={"王智雅",20,"女","1998-01-04",7}; int i=qr.update(con,sql,prams); if(i>0){ System.out.println("修改成功"); }else{ System.out.println("修改失败"); } }catch(SQLException ce){ ce.printStackTrace(); } } //查询表中所有的信息(new BeanListHandler) public static void findAll(){ //获取Connection对象 try(Connection con=JdbcUtils3.getConnection()){ //查询的SQL语句 String sql="select * from student"; List<Student>list=qr.query(con,sql,new BeanListHandler<Student>(Student.class)); for(Student ss:list){ System.out.println(ss); } }catch(SQLException ce){ ce.printStackTrace(); } } //只查询表中的一条记录那么就使用:new BeanHandler public static void findFidy(int id){ //获取Connection对象 try(Connection con=JdbcUtils3.getConnection()){ //准备SQl语句,根据id去查询 String sql="select * from student where id=?"; Object[]prams={1}; //beanHandler返回的是Student对象 Student student=qr.query(con,sql,new BeanHandler<Student>(Student.class),prams); System.out.println(student); }catch (SQLException ce){ ce.printStackTrace(); } } public static void main(String[] args) { CRUD.findFidy(1); } }