JdbcTemplate方法介绍与增删改查操作实现

public class Account {
 private Integer accountid;
 private String accountname;
 private Double balance;

 public Integer getAccountid() {
 return accountid;
 }

 public void setAccountid(Integer accountid) {
 this.accountid = accountid;
 }

 public String getAccountname() {
 return accountname;
 }

 public void setAccountname(String accountname) {
 this.accountname = accountname;
 }

 public Double getBalance() {
 return balance;
 }

 public void setBalance(Double balance) {
 this.balance = balance;
 }
}

实体类

//查询所有所有账户
public List<Account> getAllAccounts();

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {


 @Override
 public List<Account> getAllAccounts() {
 JdbcTemplate jdbcTemplate = getJdbcTemplate();
 String sql = "select * from accounts";

 //RowMapper：接口 封装了记录的行映射关系
 List<Account> lists = jdbcTemplate.query(sql, new RowMapper<Account>() {


  @Override
  public Account mapRow(ResultSet resultSet, int i) throws SQLException {
  //创建Account对象
  Account account = new Account();
  //从ResultSet中解数据保到Accounts对象中
  account.setAccountid(resultSet.getInt("accountid"));
  account.setAccountname(resultSet.getString("accountname"));
  account.setBalance(resultSet.getDouble("balance"));

  return account;
  }
 });

return account;

}

实现查询方法

//查询所有所有账户
public List<Account> getAllAccounts();

AccountDao accountDao;
@Override
public List<Account> getAllAccounts() {
 List<Account> allAccounts = accountDao.getAllAccounts();
 return allAccounts;
}

<!--识别到配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--配置数据源-->
<!--spring内置的数据源：提供连接的，不负责管理，使用连接池-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
 <property name="driverClassName" value="${jdbc.driver}"></property>
 <property name="url" value="${jdbc.url}"></property>
 <property name="username" value="${jdbc.username}"></property>
 <property name="password" value="${jdbc.password}"></property>
</bean>
<!--构建jdbcTemplate-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
 <property name="dataSource" ref="dataSource"></property>
</bean>

<bean id="accountDao" class="cn.spring.accounttest.dao.impl.AccountDaoImpl">
 <property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
<!--Service-->
<bean id="accountService" class="cn.spring.accounttest.service.impl.AccountServiceImpl">
 <property name="accountDao" ref="accountDao"></property>
</bean>

applicationContext.xml

@Test
public void getAllAccount(){
 ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
 //从spring容器中获取Service对象
 AccountService accountService = (AccountService)context.getBean("accountService");
 List<Account> allAccounts = accountService.getAllAccounts();
 for (Account account:allAccounts) {
 System.out.println("账户名："+account.getAccountname()+",余额为："+account.getBalance());
 }
}

查询测试类

@Repository
public class AccountDaoImpl implements AccountDao {

 @Autowired
 private JdbcTemplate jdbcTemplate;

 Account account = new Account();
 @Override
 public List<Account> getAllAccounts() {

  String sql = "select * from accounts";

  
  //自动映射
  RowMapper<Account> rowMapper = new BeanPropertyRowMapper<>(Account.class);
  List<Account> query = jdbcTemplate.query(sql, rowMapper);
  for (Account account : query) {
   System.out.println(account);
  }
  return query;
  }
 }

Dao实现类

<!--扫描注解：包扫描器-->
<context:component-scan base-package="cn.spring"/>

<!--识别到配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--配置数据源-->
<!--spring内置的数据源：提供连接的，不负责管理，使用连接池-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
 <property name="driverClassName" value="${jdbc.driver}"></property>
 <property name="url" value="${jdbc.url}"></property>
 <property name="username" value="${jdbc.username}"></property>
 <property name="password" value="${jdbc.password}"></property>
</bean>
<!--构建jdbcTemplate-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
 <property name="dataSource" ref="dataSource"></property>
</bean>

applicationContext.xml

//删除账户
public int delAccount(int id);

//添加用户
public int addAccount(Account account);

//修改账户
public int updaAccount(Account account);

增删改方法

@Override
 public int delAccount(int id) {

  String sql="delete from accounts where accountid=2";
  int count = jdbcTemplate.update(sql);
  return count;
 }

@Override
 public int addAccount(Account account) {
  String sql="insert into Accounts(accountname,balance) values(?,?)";
  int count = jdbcTemplate.update(sql,account.getAccountname(),account.getBalance());
  return count;
 }

 @Override
 public int updaAccount(Account account) {
  String sql="update accounts set accountname=?,balance=? where accountid=?";
  int count = jdbcTemplate.update(sql, account.getAccountname(),account.getBalance(),account.getAccountid() );
  return count;
 }

增删改方法实现类

@Test
public void delAccount(){
 ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
 AccountService accountService =(AccountService) context.getBean("accountServiceImpl");
 int i = accountService.delAccount(2);
 if (i>0){
  System.out.println("删除成功");
 }
}

@Test
public void addAccount(){
 ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
 AccountService accountServiceImpl = (AccountService) context.getBean("accountServiceImpl");
 Account account=new Account();
 account.setAccountname("刘磊");
 account.setBalance(Double.valueOf(784));
 int count = accountServiceImpl.addAccount(account);
 if (count>0){
  System.out.println("添加成功");
 }
}

@Test
public void updaAcccount(){
 ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
 AccountService accountServiceImpl = (AccountService) context.getBean("accountServiceImpl");
 Account account=new Account();
 account.setAccountid(10);
 account.setAccountname("刘磊");
 account.setBalance(Double.valueOf(784));
 int count = accountServiceImpl.updaAccount(account);
 if (count>0){
  System.out.println("修改成功");
 }
}

增删改测试类