<!-- 数据库连接池-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="url" value="jdbc:mysql:///db02?serverTimezone=UTC"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
</bean>
<!--JdbcTemplate对象-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<!--注入dataSource-->
<property name="dataSource" ref="dataSource"/>
</bean>
<!--组件扫描-->
<context:component-scan base-package="com.gbx"/>
- Service
@Service
public class BookService {
//注入dao
@Autowired
private BooKDao booKDao;
}
- Dao
@Repository
public class BookImpl implements BooKDao{
//注入JdbcTemplate
@Autowired
private JdbcTemplate jdbcTemplate;
}
public class User {
private String userId;
private String username;
private String ustatus;
public void setUserId(String userId) {
this.userId = userId;
}
public void setUsername(String username) {
this.username = username;
}
public void setUstatus(String ustatus) {
this.ustatus = ustatus;
}
}
@Repository
public class BookImpl 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);
System.out.println(update);
}
}
@Test
public void testJdbcTemplate(){
ApplicationContext context =
new ClassPathXmlApplicationContext("bean1.xml");
BookService bookService = context.getBean("bookService", BookService.class);
Book book = new Book();
book.setUserId("1");
book.setUsername("三国");
book.setUstatus("售罄");
bookService.addBook(book);
}
Service 层
//修改的方法
public void update(Book book){
booKDao.updateBook(book);
}
//删除的方法
public void delete(String id){
booKDao.deleteBook(id);
}
Dao 层
void updateBook(Book book);
void deleteBook(String id);
实现类
//修改
@Override
public void updateBook(Book book) {
//1 创建sql语句
String sql = "update t_book set username=?,ustatus=?,where user_id=?";
//2 调用方法实现
Object[] args = {book.getUsername(),book.getUstatus(),book.getUserId()};
int update = jdbcTemplate.update(sql,args);
System.out.println(update);
}
//删除
@Override
public void deleteBook(String id) {
//1 创建sql语句
String sql = "delete from t_book where user_id=?";
//2 调用方法实现
int update = jdbcTemplate.update(sql,id);
System.out.println(update);
}
Test 类
//修改
Book book = new Book();
book.setUserId("1");
book.setUsername("三国演义");
book.setUstatus("在售");
bookService.update(book);
//删除
bookService.delete("1");
2.3.1 查询返回某个值
//查询表记录
@Override
public int selectCount() {
String sql = "select count(*) from t_book";
Integer count = jdbcTemplate.queryForObject(sql, Integer.class);
return count;
}
2.3.2 查询返回对象
//查询返回对象
@Override
public Book findBookInfo(String id) {
String sql = "select * from t_book where userid=?";
Book book = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<Book>(Book.class), id);
return book;
}
2.3.3 查询返回集合
//查询返回集合
@Override
public List<Book> findAllBook() {
String sql = "select * from t_book";
List<Book> bookList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<Book>(Book.class));
return bookList;
}
2.4.1 批量添加
//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));
}
Test类
//批量添加
List<Object[]> batchArgs=new ArrayList<>();
Object[]o1 = {"3","java","a"};
Object[]o2 = {"2","py","b"};
Object[]o3 = {"4","C++","c"};
batchArgs.add(o1);
batchArgs.add(o2);
batchArgs.add(o3);
//调用批量参加
bookService.batchAdd(batchArgs);
2.4.2 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(ints);
}
//批量修改
List<Object[]> batchArgs=new ArrayList<>();
Object[]o1 = {"java","在售","4"};
Object[]o2 = {"py","售罄","9"};
Object[]o3 = {"C++","在售","6"};
batchArgs.add(o1);
batchArgs.add(o2);
batchArgs.add(o3);
bookService.batchUpdate(batchArgs);
2.4.3 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));
}
//批量修改
List<Object[]> batchArgs=new ArrayList<>();
Object[]o1 = {"4"};
Object[]o2 = {"9"};
Object[]o3 = {"6"};
batchArgs.add(o1);
batchArgs.add(o2);
batchArgs.add(o3);
bookService.batchDelete(batchArgs);