折磨了我一天一夜，人彻底傻了！
这是单元测试报错的
代码如下
这是配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 1 配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<!-- 数据库驱动-->
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<!-- 连接数据库的url-->
<property name="url" value="jdbc:mysql://localhost:3306/spring"></property>
<!-- 连接数据库的用户名-->
<property name="username" value="root"></property>
<!-- 连接数据库的密码-->
<property name="password" value="123456"></property>
</bean>
<!-- 2 配置JDBC模板-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<!-- 默认必须使用数据源 -->
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 定义id为accountDao的Bean -->
<bean id="accountDao" class="com.itheima.jdbc.AccountDaoImpl">
<!-- 将jdbcTemplate注入到accountDao实例中 -->
<property name="jdbcTemplate" ref="jdbcTemplate" />
</bean>
</beans>
这是Account.java
```java
package com.itheima.jdbc;
public class Account {
private Integer id; //账户id
private String username; //用户名
private Double balance; //账户余额
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Double getBalance() {
return balance;
}
public void setBalance(Double balance) {
this.balance = balance;
}
public String toString() {
return "Account [id=" + id + ", "
+ "username=" + username +
", balance=" + balance + "]";
}
}
这是AccountDao.java
package com.itheima.jdbc;
import java.util.List;
public interface AccountDao {
//添加
public int addAccount(Account account);
//更新
public int updateAccount(Account account);
//删除
public int deleteAccount(int id);
//通过id查询
public Account findAccountById(int id);
//查询所有账户
public List<Account> findAllAccount();
}
这是AccountDaoImpl.java
```java
package com.itheima.jdbc;
import java.util.List;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
public class AccountDaoImpl implements AccountDao {
//声明jdbcTemplate属性及其setter方法
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
// 添加账户
public int addAccount(Account account) {
// 定义SQL
String sql = "insert into account(username,balance) values(?,?)";
// 定义数组来存放SQL语句中的参数
Object[] obj = new Object[] {
account.getUsername(),
account.getBalance()
};
// 执行添加操作，返回的是受SQL语句影响的记录条数
int num = this.jdbcTemplate.update(sql, obj);
return num;
}
// 更新账户
public int updateAccount(Account account) {
// 定义SQL
String sql = "update account set username=?,balance=? where id = ?";
// 定义数组来存放SQL语句中的参数
Object[] params = new Object[] {
account.getUsername(),
account.getBalance(),
account.getId()
};
// 执行添加操作，返回的是受SQL语句影响的记录条数
int num = this.jdbcTemplate.update(sql, params);
return num;
}
//删除账户
public int deleteAccount(int id) {
// 定义SQL
String sql="delete from account where id= ? ";
//执行删除操作，返回的是受SQL语句影响的记录条数
int num=this.jdbcTemplate.update(sql, id);
return num;
}
//通过id查询账户信息
public Account findAccountById(int id) {
//定义sql语句
String sql="select * from account where id =?";
//创建一个新的BeanPropertyRowMapper对象
RowMapper<Account> rowMapper=
new BeanPropertyRowMapper<Account>(Account.class);
//将id绑到SQL语句中，并通过RowMapper返回一个Object类型的单行记录
return this.jdbcTemplate.queryForObject(sql, rowMapper, id);
}
//查询所有账户信息
public List<Account> findAllAccount(){
//定义SQL语句
String sql="select * from account";
//创建一个新的BeanPropertyRowMapper对象
RowMapper<Account> rowMapper=
new BeanPropertyRowMapper<Account>(Account.class);
//执行静态的SQL查询，并通过RowMapper返回结果
return this.jdbcTemplate.query(sql, rowMapper);
}
}
接下来的是三个一运行就报错的单元测试！
@Test
public void addAccountTest() {
//加载配置文件
ApplicationContext applicationContext=
new ClassPathXmlApplicationContext("applicationContext.xml");
//获取AccountDao实例
AccountDao accountDao=(AccountDao) applicationContext.getBean("accountDao");
//创建Account对象，并向Account对象中添加数据
Account account=new Account();
account.setUsername("tom");
account.setBalance(1000.00);
//执行addAccount()方法，并获取返回结果
int num=accountDao.addAccount(account);
if(num>0) {
System.out.println("成功插入了"+ num + "条数据！");
}else {
System.out.println("插入操作执行失败！");
}
}
@Test
public void updateAccountTest() {
//加载配置文件
ApplicationContext applicationContext=
new ClassPathXmlApplicationContext("applicationContext.xml");
//获取AccountDao实例
AccountDao accountDao=(AccountDao) applicationContext.getBean("accountDao");
//创建Account对象，并向Account对象中添加数据
Account account=new Account();
account.setId(1);
account.setUsername("tom");
account.setBalance(2000.00);
//执行updateAccount()方法，并获取返回结果
int num=accountDao.addAccount(account);
if(num>0) {
System.out.println("成功修改了"+num + "条数据！");
}else {
System.out.println("修改操作执行失败！");
}
}
@Test
public void findAccountByIdTest() {
//加载配置文件
ApplicationContext applicationContext=
new ClassPathXmlApplicationContext("applicationContext.xml");
//获取AccountDao实例
AccountDao accountDao=(AccountDao) applicationContext.getBean("accountDao");
//执行findAccountById()方法，并获取返回结果
Account account = accountDao.findAccountById(1);
System.out.println(account);
}
