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spring jdbcTemplate

时间:2014-08-29 22:39:48      阅读:421      评论:0      收藏:0      [点我收藏+]

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一、JdbcTemplate主要提供以下五类方法:

  • execute方法:可以用于执行任何SQL语句,一般用于执行DDL语句;
  • update方法及batchUpdate方法:update方法用于执行新增、修改、删除等语句;batchUpdate方法用于执行批处理相关语句;
  • query方法及queryForXXX方法:用于执行查询相关语句;
  • call方法:用于执行存储过程、函数相关语句。

 

JdbcTemplate类支持的回调类:

  • 预编译语句及存储过程创建回调:用于根据JdbcTemplate提供的连接创建相应的语句;

         PreparedStatementCreator:通过回调获取JdbcTemplate提供的Connection,由用户使用该Conncetion创建相关的PreparedStatement;

         CallableStatementCreator:通过回调获取JdbcTemplate提供的Connection,由用户使用该Conncetion创建相关的CallableStatement;

  • 预编译语句设值回调:用于给预编译语句相应参数设值;

         PreparedStatementSetter:通过回调获取JdbcTemplate提供的PreparedStatement,由用户来对相应的预编译语句相应参数设值;

         BatchPreparedStatementSetter:;类似于PreparedStatementSetter,但用于批处理,需要指定批处理大小;

  • 自定义功能回调:提供给用户一个扩展点,用户可以在指定类型的扩展点执行任何数量需要的操作;

         ConnectionCallback:通过回调获取JdbcTemplate提供的Connection,用户可在该Connection执行任何数量的操作;

         StatementCallback:通过回调获取JdbcTemplate提供的Statement,用户可以在该Statement执行任何数量的操作;

         PreparedStatementCallback:通过回调获取JdbcTemplate提供的PreparedStatement,用户可以在该PreparedStatement执行任何数量的操作;

         CallableStatementCallback:通过回调获取JdbcTemplate提供的CallableStatement,用户可以在该CallableStatement执行任何数量的操作;

  • 结果集处理回调:通过回调处理ResultSet或将ResultSet转换为需要的形式;

         RowMapper:用于将结果集每行数据转换为需要的类型,用户需实现方法mapRow(ResultSet rs, int rowNum)来完成将每行数据转换为相应的类型。

         RowCallbackHandler:用于处理ResultSet的每一行结果,用户需实现方法processRow(ResultSet rs)来完成处理,在该回调方法中无需执行rs.next(),该操作由JdbcTemplate来执行,用户只需按行获取数据然后处理即可。

         ResultSetExtractor:用于结果集数据提取,用户需实现方法extractData(ResultSet rs)来处理结果集,用户必须处理整个结果集;

 

二、接下来,看个小Demo吧

 (1)小Demo整体架构

 bubuko.com,布布扣

(2)jar包

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(3)建立数据库

create database spring

 

建立user表

create table user(id int primary key auto_increment, name varchar(16), age int);

 

(4)具体代码

model层

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 1 package com.xpw.model;
 2 
 3 public class User {
 4     private int id;
 5     private String name;
 6     private int age;
 7 
 8     public User() {
 9 
10     }
11 
12     public User(String name, int age) {
13         this.name = name;
14         this.age = age;
15     }
16 
17     public User(int id, String name, int age) {
18         this.id = id;
19         this.name = name;
20         this.age = age;
21     }
22 
23     public int getId() {
24         return id;
25     }
26 
27     public void setId(int id) {
28         this.id = id;
29     }
30 
31     public String getName() {
32         return name;
33     }
34 
35     public void setName(String name) {
36         this.name = name;
37     }
38 
39     public int getAge() {
40         return age;
41     }
42 
43     public void setAge(int age) {
44         this.age = age;
45     }
46 
47 }
View Code

 

dao接口层

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 1 package com.xpw.dao;
 2 
 3 import java.util.List;
 4 
 5 import com.xpw.model.User;
 6 
 7 public interface UserDao {
 8     public void add(User user);
 9     
10     public void update(User user);
11     
12     public void delete(int id);
13     
14     public List<User> queryAll();
15 }
View Code

 

dao实现层

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 1 package com.xpw.dao.impl;
 2 
 3 import java.sql.ResultSet;
 4 import java.sql.SQLException;
 5 import java.util.ArrayList;
 6 import java.util.List;
 7 
 8 import org.springframework.jdbc.core.JdbcTemplate;
 9 import org.springframework.jdbc.core.RowCallbackHandler;
10 
11 import com.xpw.dao.UserDao;
12 import com.xpw.model.User;
13 
14 public class UserDaoImpl implements UserDao {
15 
16     private JdbcTemplate jdbcTemplate;
17 
18     public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
19         this.jdbcTemplate = jdbcTemplate;
20     }
21 
22     @Override
23     public void add(User user) {
24         String sql = "insert into user(name, age) values(?,?)";
25         Object[] args = { user.getName(), user.getAge() };
26         int res = jdbcTemplate.update(sql, args);
27         if (res == 1)
28             System.out.println("add success");
29     }
30 
31     @Override
32     public void update(User user) {
33         String sql = "update user set name = ?, age = ? where id = ?";
34         Object[] args = { user.getName(), user.getAge(), user.getId() };
35         int res = jdbcTemplate.update(sql, args);
36         if (res == 1)
37             System.out.println("update success");
38     }
39 
40     @Override
41     public void delete(int id) {
42         String sql = "delete from user where id = ?";
43         int res = jdbcTemplate.update(sql, id);
44         if (res == 1)
45             System.out.println("delete success");
46     }
47 
48     @Override
49     public List<User> queryAll() {
50         String sql = "select * from user";
51         
52         final List<User> list = new ArrayList<User>();
53         
54         jdbcTemplate.query(sql, new RowCallbackHandler() {
55             @Override
56             public void processRow(ResultSet rs) throws SQLException {
57                 User u = new User();
58                 u.setId(rs.getInt("id"));
59                 u.setName(rs.getString("name"));
60                 u.setAge(rs.getInt("age"));
61                 list.add(u);
62             }
63         });
64         return list;
65     }
66 }
View Code

 

service实现层

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 1 package com.xpw.service;
 2 
 3 import java.util.List;
 4 
 5 import com.xpw.model.User;
 6 
 7 public interface UserService {
 8     public void add(User user);
 9 
10     public void update(User user);
11 
12     public void delete(int id);
13 
14     public List<User> queryAll();
15 }
View Code

 

service实现层.

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 1 package com.xpw.service.impl;
 2 
 3 import java.util.List;
 4 
 5 import com.xpw.dao.UserDao;
 6 import com.xpw.model.User;
 7 import com.xpw.service.UserService;
 8 
 9 public class UserServiceImpl implements UserService {
10     
11     private UserDao userDao;
12     
13     public void setUserDao(UserDao userDao) {
14         this.userDao = userDao;
15     }
16 
17     @Override
18     public void add(User user) {
19         this.userDao.add(user);
20     }
21     
22     @Override
23     public void update(User user) {
24         this.userDao.update(user);
25     }
26     
27     @Override
28     public void delete(int id) {
29         this.userDao.delete(id);
30     }
31     
32     @Override
33     public List<User> queryAll() {
34         return this.userDao.queryAll();
35     }
36 }
View Code

 

(3)文件配置

beans.xml

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 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans
 6         http://www.springframework.org/schema/beans/spring-beans.xsd
 7         http://www.springframework.org/schema/context
 8         http://www.springframework.org/schema/context/spring-context.xsd">    
 9     
10     <context:component-scan base-package="org.springframework.docs.test" />
11     <context:property-placeholder location="jdbc.properties"/>    
12     
13     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
14         <property name="driverClassName" value="${jdbc.driverClassName}"/>
15         <property name="url" value="${jdbc.url}"/>
16         <property name="username" value="${jdbc.username}"/>
17         <property name="password" value="${jdbc.password}"/>
18     </bean>
19     
20     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
21            <property name="dataSource" ref="dataSource"/> 
22     </bean>
23 
24     <bean id="userDao" class="com.xpw.dao.impl.UserDaoImpl">
25         <property name="jdbcTemplate" ref="jdbcTemplate"/>
26     </bean>
27 
28     <bean id="userService" class="com.xpw.service.impl.UserServiceImpl">
29         <property name="userDao" ref="userDao"></property>
30     </bean>
31 </beans>
View Code

 

jdbc.properties

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jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring
jdbc.username=root
jdbc.password=root
View Code

 

(4)测试

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 1 package com.xpw.test;
 2 
 3 import java.util.List;
 4 
 5 import org.junit.Test;
 6 import org.springframework.context.ApplicationContext;
 7 import org.springframework.context.support.ClassPathXmlApplicationContext;
 8 
 9 import com.xpw.model.User;
10 import com.xpw.service.UserService;
11 
12 public class JdbcTemplateTest {
13 
14     private static ApplicationContext ac;
15 
16     static {
17         ac = new ClassPathXmlApplicationContext("beans.xml");
18     }
19 
20     @Test
21     public void testAdd() {
22         UserService us = (UserService) ac.getBean("userService");
23         us.add(new User("2b", 10));
24     }
25 
26     @Test
27     public void testUpdate() {
28         UserService us = (UserService) ac.getBean("userService");
29         us.update(new User(1, "2b", 11));
30     }
31 
32     @Test
33     public void testDelete() {
34         UserService us = (UserService) ac.getBean("userService");
35         us.delete(1);
36     }
37 
38     @Test
39     public void testQuery() {
40         UserService us = (UserService) ac.getBean("userService");
41         List<User> list = us.queryAll();
42         for (User u : list) {
43             System.out
44                     .println(u.getId() + " " + u.getName() + " " + u.getAge());
45         }
46     }
47 }
View Code

结果就不直接给出来了。。

是不是,觉得很简单O(∩_∩)O哈哈~

 

spring jdbcTemplate

标签:des   style   blog   http   color   os   使用   java   io   

原文地址:http://www.cnblogs.com/chenmo-xpw/p/3945813.html

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