基于spring完成JDBC连接xampp中的phpmyadmin数据库

╰+哭是因爲堅強的太久メ 2022-04-21 23:34 191阅读 0赞

1.导包，导包的操作和导什么包就不说了。  
2.创建Dao接口，把要执行的方法封装起来：

package Jdbc;
    
    public interface UserDao {
        void save(User u);
        void delete(Integer id);
        Jdbc.User find(Integer id);
    
    }

3.创建一个类把接口的方法实现增，删，查

package Jdbc;
    
    
    import org.springframework.jdbc.core.JdbcTemplate;
    import org.springframework.jdbc.core.RowMapper;
    
    import java.sql.ResultSet;
    import java.sql.SQLException;
    
    public class UserMethod implements UserDao{
        private JdbcTemplate jt;
    
        public void setJt(JdbcTemplate jt) {
            this.jt = jt;
        }
    
        @Override
        public void  save(User u){
            String sql = "insert into t_user values(null,?,?)";
    
            jt.update(sql,u.getName(),u.getMoney());
        }
    
        @Override
        public void  delete(Integer id){
            String sql = "delete from t_user where id = ?";
            jt.update(sql,id);
    
        }
    
        @Override
        public User  find(Integer id) {
            String sql = "select * from t_user where id = ?";
    
            return jt.queryForObject(sql, new RowMapper<User>() {
                @Override
                public User mapRow(ResultSet resultSet, int i) throws SQLException {
                    User u = new User();
                    u.setId(resultSet.getInt("id"));
                    u.setName(resultSet.getString("name"));
                    u.setMoney(resultSet.getDouble("money"));
                    return u;
                }
            }, id);
    
        }
    }

4.再定义一个与数据库的数据相匹配的类。

package Jdbc;
    
    public class User {
        public void setId(Integer id) {
            this.id = id;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public void setMoney(Double money) {
            this.money = money;
        }
    
        public Integer getId() {
            return id;
        }
    
        public String getName() {
            return name;
        }
    
        public Double getMoney() {
            return this.money;
        }
    
        private Integer id;
        private String name;
        private Double money;
    
        public void show(){
            System.out.println(this.id);
            System.out.println(this.name);
            System.out.println(this.money);
        }
    }

5.配置xml文件，把这些类都放进容器里且调用spring自带的Jdbc模板，名字为applicationContext。  
我的数据库端口虽然做了修改，但配置中不需要端口号，之前写了端口号一直报错。。。

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
            <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
                    <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1/exchange"></property>
                    <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
                    <property name="user" value="root"></property>
                    <property name="password" value="123"></property>
            </bean>
    
            <bean name="user" class="Jdbc.User"></bean>
    
            <bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
                    <property name="dataSource" ref="dataSource"></property>
            </bean>
    
            <bean name="userMethod" class="Jdbc.UserMethod">
                    <property name="jt" ref="jdbcTemplate"></property>
            </bean>
    </beans>

6.最后新建一个实现方法的demo：

package Jdbc;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Demo {
        public static void main(String args[]) {
            ApplicationContext ac = new ClassPathXmlApplicationContext("Jdbc/applicationContext.xml");
            UserMethod u = (UserMethod) ac.getBean("userMethod");
            User us = (User) ac.getBean("user");
    //        us.setName("rose");
    //        us.setMoney(1000d);
    //        u.save(us);
    //        u.delete(1);
            us = u.find(4);
            us.show();
    
        }
    }