Spring框架中的JdbcTemplate

<!-- 数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
 <property name="url" value="jdbc:mysql:///user_db" />
 <property name="username" value="root" />
 <property name="password" value="root" />
 <property name="driverClassName" value="com.mysql.jdbc.Driver" />
</bean>

<!-- JdbcTemplate 对象 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
 <!--注入 dataSource  源码中是set方式构造，所以用property。有参构造用的是constructor-arg-->
 <property name="dataSource" ref="dataSource"></property>
</bean>

<!-- 组件扫描 -->
<context:component-scan base-package="com.atguigu"></context:component-scan>

@Service
public class BookService {
 //注入 dao
    @Autowired
    private BookDao bookDao;
}

@Repository
public class BookDaoImpl implements BookDao {
    //注入 JdbcTemplate
    @Autowired
    private JdbcTemplate jdbcTemplate;
}

@Repository
public class BookDaoImpl implements BookDao {
    //注入 JdbcTemplate
    @Autowired
    private JdbcTemplate jdbcTemplate;
    //添加的方法
    @Override
    public void add(Book book) {
    //1 创建 sql 语句
    String sql = "insert into t_book values(?,?,?)";
    //2 调用方法实现
    Object[] args = {book.getUserId(), book.getUsername(), book.getUstatus()};
    int update = jdbcTemplate.update(sql,args); //返回值是变化的行数 
    System.out.println(update);
    }
}

@Test
public void testJdbcTemplate() {
    ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
    //要调用Service类中的对象
    BookService bookService = context.getBean("bookService", BookService.class);
    Book book = new Book();
    book.setUserId("1");
    book.setUsername("java");
    book.setUstatus("a");
    bookService.addBook(book);
}

@Override
public void updateBook(Book book) {
    String sql = "update t_book set username=?,ustatus=? where user_id=?";
    Object[] args = {book.getUsername(), book.getUstatus(),book.getUserId()};
    int update = jdbcTemplate.update(sql, args);
    System.out.println(update);
}

@Override
public void delete(String id) {
    String sql = "delete from t_book where user_id=?";
    int update = jdbcTemplate.update(sql, id);
    System.out.println(update);
}

//查询表记录数
@Override
public int selectCount() {
    String sql = "select count(*) from t_book";
    Integer count = jdbcTemplate.queryForObject(sql, Integer.class);
    return count;
}

//查询返回对象
@Override
public Book findBookInfo(String id) {
    String sql = "select * from t_book where user_id=?";
    //调用方法
    Book book = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<Book>(Book.class), id);
    return book;
}

//查询返回集合
@Override
public List<Book> findAllBook() {
    String sql = "select * from t_book";
    //调用方法
    List<Book> bookList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<Book>(Book.class));
    return bookList;
}

//批量添加
@Override
public void batchAddBook(List<Object[]> batchArgs) {
    String sql = "insert into t_book values(?,?,?)";
    int[] ints = jdbcTemplate.batchUpdate(sql, batchArgs);
    System.out.println(Arrays.toString(ints));
   }
   //批量添加测试
   List<Object[]> batchArgs = new ArrayList<>();
   Object[] o1 = {"3","java","a"};
   Object[] o2 = {"4","c++","b"};
   Object[] o3 = {"5","MySQL","c"};
   batchArgs.add(o1);
   batchArgs.add(o2);
   batchArgs.add(o3);
   //调用批量添加
   bookService.batchAdd(batchArgs);

//批量修改
@Override
public void batchUpdateBook(List<Object[]> batchArgs) {
    String sql = "update t_book set username=?,ustatus=? where user_id=?";
    int[] ints = jdbcTemplate.batchUpdate(sql, batchArgs);
    System.out.println(Arrays.toString(ints));
 }
   //批量修改
   List<Object[]> batchArgs = new ArrayList<>();
   Object[] o1 = {"java0909","a3","3"};
   Object[] o2 = {"c++1010","b4","4"};
   Object[] o3 = {"MySQL1111","c5","5"};
   batchArgs.add(o1);
   batchArgs.add(o2);
   batchArgs.add(o3);
   //调用方法实现批量修改
   bookService.batchUpdate(batchArgs);

//批量删除
@Override
public void batchDeleteBook(List<Object[]> batchArgs) {
    String sql = "delete from t_book where user_id=?";
    int[] ints = jdbcTemplate.batchUpdate(sql, batchArgs);
    System.out.println(Arrays.toString(ints));
}
   //批量删除
   List<Object[]> batchArgs = new ArrayList<>();
   Object[] o1 = {"3"};
   Object[] o2 = {"4"};
   batchArgs.add(o1);
   batchArgs.add(o2);
   //调用方法实现批量删除
   bookService.batchDelete(batchArgs);