首页 > 代码库 > 使用Jdbc Template的基本操作步骤
使用Jdbc Template的基本操作步骤
1.appliactionContext.xml配置
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" 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"> <!--数据源的配置 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="http://www.mamicode.com/com.mysql.jdbc.Driver"></property> <property name="url" value="http://www.mamicode.com/jdbc:mysql:///spring"></property> <property name="username" value="http://www.mamicode.com/root"></property> <property name="password" value=""></property> </bean> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <bean id="userDao" class="cn.happy.impl.UserDAOImpl"> <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean> </beans>
2.接口:IUserDAO.java
public interface IUserDAO { public void addUser(User user); public void deleteUser(int id); public void updateUser(User user); public String searchUserName(int id); public User searchUser(int id); public List<User> findAll(); }
3.接口实现类:UserDAOImpl.java
Spring提供了JdbcDaoSupport支持类,所有DAO继承这个类,就会自动获得JdbcTemplate(前提是注入DataSource)。
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <bean id="userDao" class="cn.happy.impl.UserDAOImpl"> <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean>
JdbcTemplate主要提供下列方法:
1、execute方法:可以用于执行任何SQL语句,一般用于执行DDL语句;
2、update方法及batchUpdate方法:update方法用于执行新增、修改、删除等语句;batchUpdate方法用于执行批处理相关语句;
3、query方法及queryForXXX方法:用于执行查询相关语句;
4、call方法:用于执行存储过程、函数相关语句。
public class UserDAOImpl extends JdbcDaoSupport implements IUserDAO { public void addUser(User user) { String sql = "insert into user values(?,?,?)"; this.getJdbcTemplate().update(sql, user.getId(), user.getUsername(), user.getPassword()); } public void deleteUser(int id) { String sql = "delete from user where id=?"; this.getJdbcTemplate().update(sql, id); } public void updateUser(User user) { String sql = "update user set username=?,password=? where id=?"; this.getJdbcTemplate().update(sql, user.getUsername(), user.getPassword(), user.getId()); } public String searchUserName(int id) {// 简单查询,按照ID查询,返回字符串 String sql = "select username from user where id=?"; // 返回类型为String(String.class) return this.getJdbcTemplate().queryForObject(sql, String.class, id); } public List<User> findAll() {// 复杂查询返回List集合 String sql = "select * from user"; return this.getJdbcTemplate().query(sql, new UserRowMapper()); } public User searchUser(int id) { String sql="select * from user where id=?"; return this.getJdbcTemplate().queryForObject(sql, new UserRowMapper(), id); } class UserRowMapper implements RowMapper<User> { //rs为返回结果集,以每行为单位封装着 public User mapRow(ResultSet rs, int rowNum) throws SQLException { User user = new User(); user.setId(rs.getInt("id")); user.setUsername(rs.getString("username")); user.setPassword(rs.getString("password")); return user; } } }
4.测试类:UserTest.java
public class UserTest { @Test//增 public void demo1(){ User user=new User(); user.setId(3); user.setUsername("admin"); user.setPassword("123456"); ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDAO dao=(IUserDAO) applicationContext.getBean("userDao"); dao.addUser(user); } @Test//改 public void demo2(){ User user=new User(); user.setId(1); user.setUsername("admin"); user.setPassword("admin"); ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDAO dao=(IUserDAO) applicationContext.getBean("userDao"); dao.updateUser(user); } @Test//删 public void demo3(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDAO dao=(IUserDAO) applicationContext.getBean("userDao"); dao.deleteUser(3); } @Test//查(简单查询,返回字符串) public void demo4(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDAO dao=(IUserDAO) applicationContext.getBean("userDao"); String name=dao.searchUserName(1); System.out.println(name); } @Test//查(简单查询,返回对象) public void demo5(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDAO dao=(IUserDAO) applicationContext.getBean("userDao"); User user=dao.searchUser(1); System.out.println(user.getUsername()); } @Test//查(复杂查询,返回对象集合) public void demo6(){ ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml"); IUserDAO dao=(IUserDAO) applicationContext.getBean("userDao"); List<User> users=dao.findAll(); System.out.println(users.size()); } }
使用Jdbc Template的基本操作步骤
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。