JavaWeb网上图书商城完整项目-数据库操作工具类

1、首先安装数据库，在windows上安装和在unix上面安装环境不一样，我在自己的本地电脑上安装，安装成功之后，如果使用navicat远程工具访问，需要允许mysql远程能被访问

方法二、直接授权(推荐)

　　从任何主机上使用root用户，密码：youpassword（你的root密码）连接到mysql服务器：

# mysql -u root -proot 
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'youpassword' WITH GRANT OPTION;

操作完后切记执行以下命令刷新权限

FLUSH PRIVILEGES

工程中需要添加下面的jar包

数据库表：

我们来看程序的代码：

package com.weiyuan.test;

public class Person {
    private String pid;
    private String pname;
    private int age;
    private String sex;
    public String getPid() {
        return pid;
    }
    public void setPid(String pid) {
        this.pid = pid;
    }
    public String getPname() {
        return pname;
    }
    public void setPname(String pname) {
        this.pname = pname;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + age;
        result = prime * result + ((pid == null) ? 0 : pid.hashCode());
        result = prime * result + ((pname == null) ? 0 : pname.hashCode());
        result = prime * result + ((sex == null) ? 0 : sex.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Person other = (Person) obj;
        if (age != other.age)
            return false;
        if (pid == null) {
            if (other.pid != null)
                return false;
        } else if (!pid.equals(other.pid))
            return false;
        if (pname == null) {
            if (other.pname != null)
                return false;
        } else if (!pname.equals(other.pname))
            return false;
        if (sex == null) {
            if (other.sex != null)
                return false;
        } else if (!sex.equals(other.sex))
            return false;
        return true;
    }
    public Person(String pid, String pname, int age, String sex) {
        super();
        this.pid = pid;
        this.pname = pname;
        this.age = age;
        this.sex = sex;
    }
    public Person(){

    }
    @Override
    public String toString() {
        return "Person [pid=" + pid + ", pname=" + pname + ", age=" + age
                + ", sex=" + sex + "]";
    }

}

package com.weiyuan.test;

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

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.MapHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import org.junit.Test;
import org.junit.runner.RunWith;

import cn.itcast.jdbc.JdbcUtils;
import cn.itcast.jdbc.TxQueryRunner;

/**
 * 对数据库操作类的测试
 * */
public class TxRunnerTest {

    @Test
    public void testUpdate() throws SQLException{
        QueryRunner run = new TxQueryRunner();
        String sql = "insert into person(pid,pname,age,sex)values(?,?,?,?)";
        Object[] params = {"2","张三",20,"男"};
        run.update(sql,params);
        System.out.println("ok");

    }

    /*
     * 测试批处理的方法
     * */

    @Test
    public void testUpdate2() throws SQLException{
        try{
            //开启事物
            JdbcUtils.beginTransaction();
            QueryRunner run = new TxQueryRunner();
            String sql = "insert into person(pid,pname,age,sex)values(?,?,?,?)";
            Object[] params = {"2","张三",20,"男"};
            run.update(sql,params);

            Object[] params2 = {"20","张三",20,"男"};
            run.update(sql,params2);

            //提交事物
            JdbcUtils.commitTransaction();
        }catch(Exception e){
            //如果存在异常回滚事物
            JdbcUtils.rollbackTransaction();
        }
    }

    /**测试查询方法
     * @throws SQLException
     * 注意事项：1 person类中的字段必须和数据库中表的字段名称一模一样
     * 2 person存在public Person(){

    }的构造函数
     * */
    @Test
    public void testQuery() throws SQLException{

        QueryRunner run = new TxQueryRunner();
        String sql = "select * from person where pid=?";
        Person p = run.query(sql, new BeanHandler<Person>(Person.class),"20");
        System.out.println(p);

    }

    @Test
    public void testQuery2() throws SQLException{

        QueryRunner run = new TxQueryRunner();
        String sql = "select * from person";
        List<Person> lists = run.query(sql, new BeanListHandler<Person>(Person.class));
        System.out.println(lists);

    }

    @Test
    public void testQuery3() throws SQLException{
        /*
         * {sex=男, age=20, pname=张三, pid=20}
         * */
        QueryRunner run = new TxQueryRunner();
        String sql = "select * from person where pid=?";
        Map<String,Object> map= run.query(sql,
                new MapHandler(),"20");
        System.out.println(map);

    }

    @Test
    public void testQuery4() throws SQLException{
        /*
         * [{sex=男, age=1, pname=l;l;sl;, pid=1}, {sex=男, age=20, pname=张三, pid=2},
         * {sex=男, age=20, pname=张三, pid=2}, {sex=男, age=20, pname=张三, pid=2},
         * {sex=男, age=20, pname=张三, pid=2}, {sex=男, age=20, pname=张三, pid=2},
         *  {sex=男, age=20, pname=张三, pid=20}, {sex=男, age=20, pname=张三, pid=2}, {sex=男, age=20, pname=张三, pid=20},
         * {sex=男, age=20, pname=张三, pid=2}]
         * */
        QueryRunner run = new TxQueryRunner();
        String sql = "select * from person";
        List<Map<String,Object>> maps= run.query(sql,
                new MapListHandler());
        System.out.println(maps);

    }

    @Test
    public void testQuery5() throws SQLException{
        /*
         * 统计表的总共有多少条记录
         * ScalarHandler将单行单列的结果封装成Object对象
         * 直接如果直接将obj转成Int对象不同的驱动可能存在不一样的问题，
         * 所以先转换成Number对象，在转化成int类型
         * */
        QueryRunner run = new TxQueryRunner();
        String sql = "select count(*) from person";
        Object obj = run.query(sql, new ScalarHandler());
        Number number = (Number) obj;
        int count = number.intValue();
        System.out.println(count);

    }
}