dbutils的环境搭建以及使用

本是古典何须时尚 2021-11-01 10:52 385阅读 0赞

## DBUtils的简单实现方式 ##

#### 第一步、创建Java工程【此处使用的是maven工程】并导入jar包 ####

<dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.46</version>
            </dependency>
            
            <dependency>
                <groupId>commons‐dbutils</groupId>
                <artifactId>commons‐dbutils</artifactId>
                <version>1.6</version>
            </dependency>
            
            <dependency>
                <groupId>c3p0</groupId>
                <artifactId>c3p0</artifactId>
                <version>0.9.1.2</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.1.5.RELEASE</version>
            </dependency>
            
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>

#### 第二步、创建数据库 ####

CREATE TABLE `account` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `name` varchar(40) DEFAULT NULL,
      `money` float DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8

#### 第三步、创建JavaBean(又称Pojo对象) ####

public class Account {
       private Integer id;
       private String name;
       private Double money;
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Double getMoney() {
            return money;
        }
    
        public void setMoney(Double money) {
            this.money = money;
        }
    
        @Override
        public String toString() {
            return "Account{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", money=" + money +
                    '}';
        }
    }

#### 第四步、创建Dao接口 ####

import java.util.List;
    
    public interface AccountDao {
    
        public Account findById(Integer id);
    
        public List<Account> findAll();
    
        public void save(Account account);
    
        public void update(Account account);
    
        public void deleteById(Integer id);
    
    }

#### 第五步、编写实现类 ####

public class AccountDaoImp implements AccountDao{
    
    
        private QueryRunner queryRunner;
    
        //依赖注入
        public void setQueryRunner(QueryRunner queryRunner){
            this.queryRunner=queryRunner;
        }
    
        @Override
        public Account findById(Integer id) {
            Account account=new Account();
            //此处要求如下
            //第二个 参数是顶级接口ResultSetHandler的实现类
            // 如果返回一个对象用BeanResultSetHandler
            //如果返回多个对象使用BeanListHandler
            //要求数据库字段和实体类字段要要一致
            //如果不一致需要实现ResultSetHandler接口
            try{
            account=queryRunner.query("select * from account where id= ?",new BeanHandler<Account>(Account.class),id);
            }        catch (Exception e){
                e.printStackTrace();
            }
            return account;
        }
    
        @Override
        public List<Account> findAll() {
            List<Account> list=new ArrayList<>();
            try{
                list=queryRunner.query("select * from account where id= ?",new BeanListHandler<Account>(Account.class));
            }        catch (Exception e){
                e.printStackTrace();
            }
            return list;
        }
    
        @Override
        public void save(Account account) {
    
        }
    
        @Override
        public void update(Account account) {
    
        }
    
        @Override
        public void deleteById(Integer id) {
    
        }
    }

#### 第六步、测试 ####

使用Junit调用实现类进行测试！

## DBUtils的Spring下的使用 ##

前四步相同，下面从第五步开始

#### 第五步、编写Spring配置文件 ####

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
              http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
              http://www.springframework.org/schema/aop
              http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
              http://www.springframework.org/schema/context
              http://www.springframework.org/schema/context/spring-context-4.3.xsd
              http://www.springframework.org/schema/mvc
              http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
              http://www.springframework.org/schema/tx
              http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
    
        
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="com.mysql.jdbc.Driver"/>
            <property name="jdbcUrl" value="jdbc:mysql:///mybatis"/>
            <property name="user" value="root"/>
            <property name="password" value="root"/>
        </bean>
    
        
        <bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner">
            <constructor-arg name="ds" ref="dataSource"/>
        </bean>
    
        
        <bean id="accountDao" class="AccountDaoImp">
            <property name="queryRunner" ref="queryRunner"/>
        </bean>

<bean id="" class=""> <constructor-arg name="ds" ref="dataSource"/> </bean>

</beans>

#### 第六步、编写实现类 ####

在实现类中通过从IOC容器获取对象就可以

#### 第七步、测试 ####

转载于:https://www.cnblogs.com/kitor/p/10996355.html