src/edu/school/dao/impl/InstructorDaoImpl.java

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package edu.school.dao.impl;

import edu.school.dao.InstructorDao;
import edu.school.dao.TeacherDao;
import edu.school.entity.Instructor;
import edu.school.entity.PageTool;
import edu.school.entity.Student;
import edu.school.entity.Teacher;
import edu.school.utils.C3p0Utils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

//辅导员
public class InstructorDaoImpl implements InstructorDao {
    private QueryRunner runner=new QueryRunner(C3p0Utils.getDs());

    @Override
    public int addInstructor(Instructor instructor) {
        try {
            //执行插入sql
            runner.update("insert into instructor(ino,realname,pwd,createDate) values (?,?,?,?)",
                    instructor.getIno(),instructor.getRealname(),instructor.getPwd(),instructor.getCreateDate());
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return 1;
    }

    @Override
    public Instructor queryByIno(String ino) {
        try {//返回查询的信息
            return runner.query("select * from instructor where ino=?", new BeanHandler<Instructor>(Instructor.class),ino);
        } catch (SQLException e) {
            throw new RuntimeException(e);//抛出运行异常
        }
    }

    //统计数量
    @Override
    public int queryCount() {
        String sql="select count(*) from instructor";
        try {
            Long count =  (Long) runner.query(sql, new ScalarHandler());
            //将long的类型转成int类型
            return count.intValue();
        } catch (SQLException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    @Override
    public List<Instructor> findAllByPage(PageTool pageTool) {
        String sql="select * from instructor limit ?,?";