本文总结了两种使用JDBCTemplate进行数据库CRUD操作的例子,我用的是pg,废话不说,直接开始吧。
先贴一张目录结果图吧:
上图中最主要的是配置文件和所需的各种jar包。
一、通过属性文件的.properties的方式
这种方法很简单,也是最基本的,主要是从配置文件读取数据库连接信息,然后设置到数据源中,再将数据源设置到JdbcTemplate中,通过这个对象进行数据库的CRUD操作。
1、配置文件config.properties
用来配置数据库连接信息,我配置的都是一下基本信息
#数据库地址
db.driverClassName = org.postgresql.Driver
db.url = jdbc:postgresql://127.0.0.1:5432/hcs
db.username = postgres
db.password =postgres
db.initialSize=5
db.maxActive=1000
db.maxIdle=200
db.minIdle=100
db.maxWait=100
db.validationQuery = select version()
2、获取属性文件config.properties
/**
* 获取属性配置文件
* @return
*/
public Properties getProp(){
InputStream is = this.getClass().getClassLoader().getResourceAsStream("config.properties");
Properties prop = new Properties();
try {
prop.load(is);
} catch (IOException e) {
e.printStackTrace();
}
return prop;
}
3、创建数据源并获取JdbcTemplate对象
/**
* 创建数据源并获取JdbcTemplate
* @return
*/
BasicDataSource basicDataSource = null;
public JdbcTemplate getTemplate(){
basicDataSource = new BasicDataSource();
Properties pro = getProp();
basicDataSource.setDriverClassName(pro.getProperty("db.driverClassName"));
basicDataSource.setUrl(pro.getProperty("db.url"));
basicDataSource.setUsername(pro.getProperty("db.username"));
basicDataSource.setPassword(pro.getProperty("db.password"));
basicDataSource.setValidationQuery(pro.getProperty("db.validationQuery"));
basicDataSource.setInitialSize(50);
basicDataSource.setMaxActive(100);
basicDataSource.setMaxIdle(50);
basicDataSource.setMinIdle(40);
basicDataSource.setMaxWait(100);
basicDataSource.setRemoveAbandoned(true);
basicDataSource.setRemoveAbandonedTimeout(280);
basicDataSource.setLogAbandoned(true);
basicDataSource.setTestOnBorrow(true);
JdbcTemplate jdbcTemplate = new JdbcTemplate();
jdbcTemplate.setDataSource(basicDataSource);
return jdbcTemplate;
}
4、增删改查
增加
/**
* 保存数据
* @throws Exception
*/
public int saveData(){
String id = UUID.randomUUID().toString();
String sql = "INSERT INTO sys_user VALUES('"+id+"','111','111','111','111','111','111','111')";
int save = 0;
try {
save = getTemplate().update(sql);
close();
} catch (DataAccessException e) {
e.printStackTrace();
}
return save;
}
修改
/**
* 更新数据
* @return
*/
public int updateData(){
String sql = "UPDATE sys_user SET user_name='hyc',user_login_name = 'hyc' WHERE user_id = ?";
int update = getTemplate().update(sql,"222");
close();
return update;
}
删除
/**
* 删除数据
* @return
*/
public int deleteData(){
String sql = "DELETE FROM sys_user WHERE user_id = ?";
int delete = getTemplate().update(sql,"111");
close();
return delete;
}
查询
/**
* 查询数据
* @return
*/
public long getData(){
String sql = "SELECT COUNT(*) FROM sys_user";
long result = getTemplate().queryForObject(sql, Long.class);
close();
return result;
}
关闭连接方法close()
/**
* 关闭连接
*/
public void close(){
if(null!=basicDataSource){
try {
basicDataSource.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
二、使用xml配置文件
这种方式就是纯Spring方式,需要用到Spring的配置文件,通过IOC和AOP来new对象。
1、Spring配置文件bean.xml(名称自定义,但必须是XML格式)
<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- IOC和DI的注解扫描 -->
<context:component-scan base-package="com.hyc" ></context:component-scan>
<!-- 打开AOP的注解 -->
<!-- 这里用的是中间的横线而不是下划线 -->
<!-- <aop:aspectj-autoproxy></aop:aspectj-autoproxy> -->
<!--第一步:配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="jdbcUrl" value="jdbc:postgresql://127.0.0.1:5432/hcs"></property>
<property name="driverClass" value="org.postgresql.Driver"></property>
<property name="user" value="postgres"></property>
<property name="password" value="hyc123"></property>
</bean>
<!-- 第二步:将数据源设置JdbcTemplate模板中 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 第三步:在dao中注入JdbcTemplate模板 -->
<bean id="sysUserDao" class="com.hyc.dao.SysUserDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<!-- 第四步:在service中注入dao -->
<bean id="sysUserService" class="com.hyc.service.SysUserService">
<property name="sysUserDao" ref="sysUserDao"></property>
</bean>
</beans>
2、创建dao层,将JdbcTemplate作为其属性,并添加get和set方法,这样就可以在dao层调用模板对象
/**
* DAO层
*
* @createtime 2017年10月31日 下午4:39:44
* @description
*/
public class SysUserDao {
private JdbcTemplate jdbcTemplate;
/**
* @return the jdbcTemplate
*/
public JdbcTemplate getJdbcTemplate() {
return jdbcTemplate;
}
/**
* @param jdbcTemplate
* the jdbcTemplate to set
*/
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
}
3、创建service层,并将dao层作为其属性,提供get和set方法,这样就可以在service中调用dao对象及其中的方法了
/***
* service层
* @createtime 2017年10月31日 下午4:39:31
* @description
*/
public class SysUserService {
private SysUserDao sysUserDao;
/**
* @return the sysUserDao
*/
public SysUserDao getSysUserDao() {
return sysUserDao;
}
/**
* @param sysUserDao the sysUserDao to set
*/
public void setSysUserDao(SysUserDao sysUserDao) {
this.sysUserDao = sysUserDao;
}
}
4、在DAO中调用JdbcTemplate对象进行数据库的CRUD操作
增加
/**
* 新增用户
* @param sysUser
* @return
*/
public int addUser(SysUser sysUser) {
String sql = "INSERT INTO sys_user VALUES('" + sysUser.getUserId()
+ "','" + sysUser.getUserName() + "','"
+ sysUser.getUserRealName() + "','" + sysUser.getUserCode()
+ "','" + sysUser.getUserLoginName() + "','"
+ sysUser.getUserDeptId() + "','" + sysUser.getIsdepadmin()
+ "','" + sysUser.getFreecapacity() + "')";
int save = 0;
try {
save = jdbcTemplate.update(sql);
} catch (DataAccessException e) {
e.printStackTrace();
}
return save;
}
删除
/**
* 删除用户
* @param userId
* @return
*/
public int delUser(String userId){
String sql = "DELETE FROM sys_user WHERE user_id = ?";
return jdbcTemplate.update(sql, "d83ea6cf-4f78-4fd4-ac4f-bb32ec706af5");
}
修改
/**
* 修改用户信息
* @param sysUser
* @return
*/
public int updateUser(SysUser sysUser){
String sql = "UPDATE sys_user SET user_name=?,user_login_name = ? WHERE user_id = ?";
return jdbcTemplate.update(sql, sysUser.getUserName(),sysUser.getUserLoginName(),sysUser.getUserId());
}
查看
/**
* 查看用户
* @param userId
* @return
*/
public Map<String, Object> viewUser(String userId){
String sql = "SELECT * FROM sys_user WHERE user_id=?";
return jdbcTemplate.queryForMap(sql,userId);
}
5、在service层(业务逻辑层)通过dao对象进行调用数据库操作相关的方法
//增
public int saveUser(SysUser sysUser){
return sysUserDao.addUser(sysUser);
}
//删
public int delUser(String userId){
return sysUserDao.delUser(userId);
}
//改
public int updateUser(SysUser sysUser){
return sysUserDao.updateUser(sysUser);
}
//查
public Map<String, Object> viewUser(String userId){
return sysUserDao.viewUser(userId);
}
6、创建pojo对象,即service中的SysUser,也是数据库表所映射的对象(ORM)
要提供所有属性的get和set方法
1 package com.hyc.dao;
2
3 public class SysUser {
4 private String userId;
5 private String userName;
6 private String userRealName;
7 private String userCode;
8 private String userLoginName;
9 private String userDeptId;
10 private String isdepadmin;
11 private String freecapacity;
12
13 /**
14 * @return the userId
15 */
16 public String getUserId() {
17 return userId;
18 }
19
20 /**
21 * @param userId
22 * the userId to set
23 */
24 public void setUserId(String userId) {
25 this.userId = userId;
26 }
27
28 /**
29 * @return the userName
30 */
31 public String getUserName() {
32 return userName;
33 }
34
35 /**
36 * @param userName
37 * the userName to set
38 */
39 public void setUserName(String userName) {
40 this.userName = userName;
41 }
42
43 /**
44 * @return the userRealName
45 */
46 public String getUserRealName() {
47 return userRealName;
48 }
49
50 /**
51 * @param userRealName
52 * the userRealName to set
53 */
54 public void setUserRealName(String userRealName) {
55 this.userRealName = userRealName;
56 }
57
58 /**
59 * @return the userCode
60 */
61 public String getUserCode() {
62 return userCode;
63 }
64
65 /**
66 * @param userCode
67 * the userCode to set
68 */
69 public void setUserCode(String userCode) {
70 this.userCode = userCode;
71 }
72
73 /**
74 * @return the userLoginName
75 */
76 public String getUserLoginName() {
77 return userLoginName;
78 }
79
80 /**
81 * @param userLoginName
82 * the userLoginName to set
83 */
84 public void setUserLoginName(String userLoginName) {
85 this.userLoginName = userLoginName;
86 }
87
88 /**
89 * @return the userDeptId
90 */
91 public String getUserDeptId() {
92 return userDeptId;
93 }
94
95 /**
96 * @param userDeptId
97 * the userDeptId to set
98 */
99 public void setUserDeptId(String userDeptId) {
100 this.userDeptId = userDeptId;
101 }
102
103 /**
104 * @return the isdepadmin
105 */
106 public String getIsdepadmin() {
107 return isdepadmin;
108 }
109
110 /**
111 * @param isdepadmin
112 * the isdepadmin to set
113 */
114 public void setIsdepadmin(String isdepadmin) {
115 this.isdepadmin = isdepadmin;
116 }
117
118 /**
119 * @return the freecapacity
120 */
121 public String getFreecapacity() {
122 return freecapacity;
123 }
124
125 /**
126 * @param freecapacity
127 * the freecapacity to set
128 */
129 public void setFreecapacity(String freecapacity) {
130 this.freecapacity = freecapacity;
131 }
132
133 }
View Code
7、编写单元测试用例,测试增删改查
在增删改查之前需要获取service对象,而service对象是通过配置文件注入的,所以要通过配置文件的getBean方法获取,这部分代码数据全局变量,所以可以写在junit的before方法中
获取service对象
ApplicationContext context = null;
SysUserService sysUserService = null;
@Before
public void before(){
context = new ClassPathXmlApplicationContext("bean.xml");
sysUserService = context.getBean("sysUserService",SysUserService.class);
}
测试增删改查
//测试增加操作
@Test
public void testSaveUser(){
SysUser sysUser= new SysUser();
sysUser.setUserId(UUID.randomUUID().toString());
sysUser.setUserName("hyc2");
sysUser.setUserRealName("hyc2");
sysUser.setUserCode("sss");
sysUser.setUserLoginName("hyc2");
sysUser.setUserDeptId("ddd");
sysUser.setIsdepadmin("1");
sysUser.setFreecapacity("20");
int save = sysUserService.saveUser(sysUser);
System.out.println(save==1?"保存成功":"保存失败");
}
//测试删除操作
@Test
public void testDelUser(){
int del = sysUserService.delUser("4436b3c2-381f-4bc3-8a4c-0a935b30af68");
System.out.println(del==1?"删除成功":"删除失败");
}
//测试修改操作
@Test
public void testUpdateUser(){
SysUser sysUser= new SysUser();
sysUser.setUserId("441c0c98-f150-45f2-84ca-c0be1b944275");
sysUser.setUserName("hyc222");
sysUser.setUserRealName("hyc222");
sysUser.setUserCode("sss22");
sysUser.setUserLoginName("hyc222");
sysUser.setUserDeptId("ddd");
sysUser.setIsdepadmin("1");
sysUser.setFreecapacity("20");
int update = sysUserService.updateUser(sysUser);
System.out.println(update==1?"修改成功":"修改失败");
}
//测试查询操作
@Test
public void testViewUser(){
Map<String, Object> sysUser = sysUserService.viewUser("222");
System.out.println("用户名是:"+sysUser.get("user_name"));
}
以上就是所有内容,已经测试,如果按照步骤即可跑起来,但是我的CRUD都是最简单的,主要是介绍这两种方法的框架搭建。
推荐一篇比较好的博客:----->,作者在对xml配置文件中配置原理部分的描述比较通俗易懂,可借鉴。