一、JdbcTemplate
Spring 框架对 JDBC 进行封装，使用 JdbcTemplate 方便实现对数据库操作
二、实战
2.1 引入依赖
mysql mysql-connector-java 8.0.24 org.springframework spring-jdbc 5.3.6 org.springframework spring-orm 5.3.6 org.springframework spring-tx 5.3.6
2.2 配置连接池
2.3 配置JdbcTemplate 对象，注入 DataSource
2.4 扫描注解
2.5 创建 service 类，创建 dao 类，在 dao 注入 jdbcTemplate 对象
@Repository
public class UserDaoImpl implements UserDao {
//注入 JdbcTemplate
@Autowired
private JdbcTemplate jdbcTemplate;
}
@Service
public class UserService {
// 注入 dao
@Autowired
private UserDao userDao;
}
三、操作(CRUD)
实体类
public class User {
private String userId;
private String username;
private String ustatus;
@Override
public String toString() {
return "User [userId=" + userId + ", username=" + username + ", ustatus=" + ustatus + "]";
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUstatus() {
return ustatus;
}
public void setUstatus(String ustatus) {
this.ustatus = ustatus;
}
}
3.1 添加
service
//添加
public void addUser(User user) {
userDao.add(user);
}
dao
@Override
public void add(User user) {
// 1 创建 sql 语句
String sql = "insert into t_user values(?,?,?)";
// 2 调用方法实现
Object[] args = { user.getUserId(), user.getUsername(), user.getUstatus() };
int update = jdbcTemplate.update(sql, args);
System.out.println(update);
}
测试
@Test
public void test1() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
User user = new User();
user.setUserId("1");
user.setUsername("java");
user.setUstatus("a");
userService.addUser(user);
}
结果
3.2 修改
service
//修改
public void updateUser(User user) {
userDao.updateUser(user);
}
dao
@Override
public void updateUser(User user) {
// TODO Auto-generated method stub
String sql = "update t_user set username=?,ustatus=? where userId=?";
// 2 调用方法实现
Object[] args = { user.getUsername(), user.getUstatus() ,user.getUserId()};
int update = jdbcTemplate.update(sql, args);
System.out.println(update);
}
测试
@Test
public void test2() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
User user = new User();
user.setUserId("1");
user.setUsername("javaScrip");
user.setUstatus("abc");
userService.updateUser(user);
}
3.3 删除
// 删除
public void deleteUser(String id) {
userDao.deleteUser(id);
}
@Override
public void deleteUser(String id) {
String sql="delete from t_user where userId=?";
int update=jdbcTemplate.update(sql, id);
System.out.println(update);
}
@Test
public void test3() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
userService.deleteUser("1");
}
四、查询
4.1 查询总记录数 jdbcTemplate.queryForObject
@Test
public void test4() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
int count = userService.selectUserCount();
System.out.println("数据库中共有记录:"+count);
}
//查询记录数
public int selectUserCount() {
return userDao.selectCount();
}
@Override
public int selectCount() {
String sql = "select count(0) from t_user";
Integer count = jdbcTemplate.queryForObject(sql, Integer.class);
return count;
}
4.2 查询返回对象
@Test
public void test5() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
User user=userService.findUserInfo("1");
System.out.println(user);
}
//查询对象
public User findUserInfo(String id) {
// TODO Auto-generated method stub
return userDao.findUserInfo(id);
}
@Override
public User findUserInfo(String id) {
String sql = "select userId,username,ustatus from t_user where userId=?";
User user = jdbcTemplate.queryForObject(sql, new
BeanPropertyRowMapper(User. class),id);
return user;
}
4.3 查询返回集合
@Test
public void test6() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
List list=userService.findAllUser();
System.out.println(list);
}
//查询返回集合
public List findAllUser(){
return userDao.findAllUser();
}
@Override
public List findAllUser() {
String sql = "select userId,username,ustatus from t_user";
List list = jdbcTemplate.query(sql, new
BeanPropertyRowMapper(User. class));
return list;
}
五、批量操作 jdbcTemplate.batchUpdate
5.1 添加
@Test
public void test7() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
List list = new ArrayList<>();
Object[] o1 = { "11", "易语言", "中文"};
Object[] o2 = { "12", "c++", "cc"};
Object[] o3 = { "13", "MySQL", "数据库"};
list.add(o1);
list.add(o2);
list.add(o3);
userService.batchAdd(list);
}
//批量添加
public void batchAdd(List list){
userDao.batchAdd(list);
}
@Override
public void batchAdd(List list) {
String sql = "insert into t_user values(?,?,?)";
int[] ints = jdbcTemplate.batchUpdate(sql, list);
System.out.println(ints);
}
5.2 修改
@Test
public void test8() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
List list = new ArrayList<>();
Object[] o1 = { "易语言易", "中文语言","11"};
Object[] o2 = { "c++c", "ccccc","12"};
Object[] o3 = {"MySQL+ORACle", "数据库数据", "13"};
list.add(o1);
list.add(o2);
list.add(o3);
userService.batchUpdate(list);
}
//批量修改
public void batchUpdate(List list) {
userDao.batchUpdate(list);
}
@Override
public void batchUpdate(List list) {
String sql = "update t_user set username=?,ustatus=? where userId=?";
int[] ints = jdbcTemplate.batchUpdate(sql, list);
System.out.println(ints);
}
5.3 删除
@Test
public void test9() {
ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
UserService userService = context.getBean("userService", UserService.class);
List list = new ArrayList<>();
Object[] o1 = { "11"};
Object[] o2 = { "12"};
Object[] o3 = { "13"};
list.add(o1);
list.add(o2);
list.add(o3);
userService.batchDelete(list);
}
//批量删除
public void batchDelete(List list) {
userDao.batchDelete(list);
}
@Override
public void batchDelete(List list) {
String sql = "delete from t_user where userId=?";
int[] ints = jdbcTemplate.batchUpdate(sql, list);
System.out.println(ints);
}
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