spring 中简单的 jdbcTemplate案例 + 切面环绕通知

- 日理万妓 2023-06-13 06:23 11阅读 0赞

# 简单的 jdbcTemplate案例 + 切面 环绕通知 #

案例简介 ：  
使用jdbcTemplate 对 emp表 进行CRUD（增删改查）并且记录每次方法的执行时间并保存

###### 1、切面类 ######

用于记录每次方法的执行时间并保存

public class MyAspect {
        EmpService empService = new EmpService();
        public Object aroundHandler(ProceedingJoinPoint jointPoint) throws Throwable {
            long start = System.currentTimeMillis();
            System.out.println("开始执行"+jointPoint.getSignature().getName()+"方法");
    
                Object name =  jointPoint.proceed();
    
                long end = System.currentTimeMillis()-start;
                System.out.println("执行方法耗时"+end+"毫秒");
    
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            JdbcTemplate jdbcTemplate = applicationContext.getBean(JdbcTemplate.class);
            jdbcTemplate.update("insert into t_data set fm=?, tim=?",jointPoint.getSignature().getName(),end);
    
            return name;
        }
    
    }

###### 2、实体类 ######

emp 的字段 和构造方法

package pojo;
    
    public class T_Emp {
        private Integer id;
        private String name;
        private String content;
        private Integer did;
    
        public T_Emp() {
        }
    
        public T_Emp(String name, String content, Integer did) {
            this.name = name;
            this.content = content;
            this.did = did;
        }
    
        public T_Emp(Integer id, String name, String content, Integer did) {
            this.id = id;
            this.name = name;
            this.content = content;
            this.did = did;
        }
    
        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 String getContent() {
            return content;
        }
    
        public void setContent(String content) {
            this.content = content;
        }
    
        public Integer getDid() {
            return did;
        }
    
        public void setDid(Integer did) {
            this.did = did;
        }
    
        @Override
        public String toString() {
            return "T_Emp{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", content='" + content + '\'' +
                    ", did=" + did +
                    '}';
        }
    }

###### 3、增删改查的方法 ######

public class EmpService implements EmpServiceI {
    
    
    
        //添加
        @Override
        public void ins(T_Emp t_emp) {
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            JdbcTemplate jdbcTemplate = applicationContext.getBean(JdbcTemplate.class);
            jdbcTemplate.update("insert into t_emp set name=?, content=?,did=?", t_emp.getName(), t_emp.getContent(), t_emp.getDid());
        }
    
        //删除
        @Override
        public void del(int id) {
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            JdbcTemplate jdbcTemplate = applicationContext.getBean(JdbcTemplate.class);
            jdbcTemplate.update("delete from t_emp where id =?", id);
    
        }
    	//修改
        @Override
        public void upt(T_Emp t_emp) {
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            JdbcTemplate jdbcTemplate = applicationContext.getBean(JdbcTemplate.class);
            jdbcTemplate.update("update  t_emp set name=?, content=?,did=? where id = ?", t_emp.getName(), t_emp.getContent(), t_emp.getDid(),t_emp.getId());
        }
    	//查询列表
        @Override
        public List<T_Emp> sel() {
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            JdbcTemplate jdbcTemplate = applicationContext.getBean(JdbcTemplate.class);
            List<T_Emp> tEmps = null;
            tEmps = jdbcTemplate.query("select * from t_emp ", new RowMapper<T_Emp>() {
    
                @Override
                public T_Emp mapRow(ResultSet resultSet, int i) throws SQLException {
                    T_Emp t_emp = new T_Emp();
                    t_emp.setId(resultSet.getInt("id"));
                    t_emp.setName(resultSet.getString("name"));
                    t_emp.setContent(resultSet.getString("content"));
                    t_emp.setDid(resultSet.getInt("did"));
                    return t_emp;
                }
            });
            return tEmps;
        }
    
        //查询单条数据
        @Override
        public T_Emp seldan(int i) {
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            JdbcTemplate jdbcTemplate = applicationContext.getBean(JdbcTemplate.class);
            T_Emp tEmp = null;
            tEmp = jdbcTemplate.queryForObject("select * from t_emp where id= ?", new RowMapper<T_Emp>() {
    
                @Override
                public T_Emp mapRow(ResultSet resultSet, int i) throws SQLException {
                    T_Emp t_emp = new T_Emp();
                    t_emp.setId(resultSet.getInt("id"));
                    t_emp.setName(resultSet.getString("name"));
                    t_emp.setContent(resultSet.getString("content"));
                    t_emp.setDid(resultSet.getInt("did"));
                    return t_emp;
                }
            },i);
            return tEmp;
        }
    
    }

###### 4、增删改查方法的接口 ######

public interface EmpServiceI {
    
        void ins(T_Emp t_emp);
    
        void del(int id);
    
        void upt(T_Emp t_emp);
    
        List<T_Emp> sel();
    
        T_Emp seldan(int i);
    }

###### 5、测试类 ######

public class JdbcTemplateTest {
    
        public static void main(String[] args) {
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
            EmpServiceI empServiceI = applicationContext.getBean(EmpServiceI.class);
    
    //        //添加
    //        T_Emp t_emp = new T_Emp("jake","very good",10);
    //        empServiceI.ins(t_emp);
    
    //        //删除
    //        empServiceI.del(53);
    
    //        //修改
    //        T_Emp t_emp2 = new T_Emp(54,"jakelove","very good",100);
    //        empServiceI.upt(t_emp2);
    
    //        查询单条数据
            T_Emp t_emp = empServiceI.seldan(54);
            System.out.println(t_emp.toString());
    
            //查询 列表
    //        List<T_Emp> t_emps = empServiceI.sel();
    //
    //        for (T_Emp t_emp1:t_emps) {
    //            System.out.println(t_emp1.toString());
    //        }
    
        }
    
    }

###### 6、xml配置 ######

<?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"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
    	http://www.springframework.org/schema/beans/spring-beans.xsd
    	http://www.springframework.org/schema/aop
    	http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    
    
        
        <aop:aspectj-autoproxy/>
    
        
        <bean id="deptService" class="service.EmpService"></bean>
    
        
        <bean id="myAspect" class="aspect.MyAspect"></bean>
    
    
        <aop:config>
            <aop:aspect ref="myAspect">
                <aop:pointcut id="poi1" expression="execution(* service.EmpService.*(..))"/>
    
                <aop:around method="aroundHandler" pointcut-ref="poi1"></aop:around>
    
            </aop:aspect>
    
        </aop:config>
    
    
        
        <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    
        <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
            <property name="url" value="${jdbc.url}"></property>
            <property name="password" value="${jdbc.password}"></property>
            <property name="driverClassName" value="${jdbc.driver}"></property>
            <property name="username" value="${jdbc.username}"></property>
        </bean>
    
        <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
    
    
    </beans>

还有一个jdbc.properties文件

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1:3306/yuangong?characterEncoding=UTF-8
    jdbc.username=root
    jdbc.password=root

?characterEncoding=UTF-8 为了防止sql乱码 不加这语句 加入数据库的中文就会成 ???

=========

还有所需jar包就不跟大家发了，看一下图片吧  
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0MDg2MDYw_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191114184735906.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0MDg2MDYw,size_16,color_FFFFFF,t_70