整合JDBC- spring本身是一个框架,spring操作jdbc是容器内的对象操作JDBC
spring提供了很多模板整合Dao技术spring中提供了一个可以操作数据库的对象.对象封装了jdbc技术.- JDBCTemplate => JDBC模板对象
- 与DBUtils中的QueryRunner非常相似.
步骤- 导包
- 4+2(核心+日志)
- spring-test & spring-aop & junit4类库(测试包)
- c3p0连接池 * JDBC驱动
- spring-jdbc & spring-tx事务
- 准备数据库
- 书写Dao
[Java] 纯文本查看 复制代码 @Test
public void fun1() throws Exception{
//0 准备连接池
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql:///hibernate_database");
dataSource.setUser("root");
dataSource.setPassword("root");
//1 创建JDBC模板对象
JdbcTemplate jt = new JdbcTemplate();
jt.setDataSource(dataSource);
//2 书写sql,并执行
String sql = "insert into t_user values(null,'rose') ";
jt.update(sql);
}
[Java] 纯文本查看 复制代码 public class User {
private Integer id;
private String name;
"set and get method"
}
[Java] 纯文本查看 复制代码 public interface UserDao {
void save(User u);
void delete(Integer id);
void update(User u);
User getById(Integer id);
int getTotalCount();
List<User> getAll();
}
[Java] 纯文本查看 复制代码 //使用JDBC模板实现增删改查
public class UserDaoImpl extends JdbcDaoSupport implements UserDao {
public class UserDaoImpl implements UserDao {
JDBCTemple jt;
@Override
public void save(User u) {
String sql = "insert into t_user values(null,?) ";
jt.update(sql, u.getName());
"or"
super.getJdbcTemplate().update(sql, u.getName());
}
@Override
public void delete(Integer id) {
String sql = "delete from t_user where id = ? ";
jt.update(sql,id);
"or"
super.getJdbcTemplate().update(sql,id);
}
@Override
public void update(User u) {
String sql = "update t_user set name = ? where id=? ";
jt..update(sql, u.getName(),u.getId());
"or"
super.getJdbcTemplate().update(sql, u.getName(),u.getId());
}
@Override
public User getById(Integer id) {
String sql = "select * from t_user where id = ? ";
return super.getJdbcTemplate().queryForObject(sql,new RowMapper<User>(){
@Override
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}}, id);
}
@Override
public int getTotalCount() {
String sql = "select count(*) from t_user ";
Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class);
return count;
}
@Override
public List<User> getAll() {
String sql = "select * from t_user ";
List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>(){
@Override
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}});
return list;
}
}
spring配置 [XML] 纯文本查看 复制代码 "db.properties文件"
jdbc.jdbcUrl=jdbc:mysql:///hibernate_32
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=1234
[XML] 纯文本查看 复制代码 <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans [url]http://www.springframework.org/schema/beans/spring-beans-4.2.xsd[/url] [url]http://www.springframework.org/schema/context[/url] [url]http://www.springframework.org/schema/context/spring-context-4.2.xsd[/url] ">
<!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 1.将连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
<property name="driverClass" value="${jdbc.driverClass}" ></property>
<property name="user" value="${jdbc.user}" ></property>
<property name="password" value="${jdbc.password}" ></property>
</bean>
<!-- 2.将JDBCTemplate放入spring容器 -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
<property name="dataSource" ref="dataSource" ></property>
</bean>
<!-- 3.将UserDao放入spring容器 -->
<bean name="userDao" class="cn.itcast.a_jdbctemplate.UserDaoImpl" >
<property name="jt" ref="jdbcTemplate" ></property>
<property name="dataSource" ref="dataSource" ></property>
</bean>
</beans>
[Java] 纯文本查看 复制代码 //演示JDBC模板
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo {
@Resource(name="userDao")
private UserDao ud;
@Test
public void fun2() throws Exception{
User u = new User();
u.setName("tom");
ud.save(u);
}
@Test
public void fun3() throws Exception{
User u = new User();
u.setId(2);
u.setName("jack");
ud.update(u);
}
@Test
public void fun4() throws Exception{
ud.delete(2);
}
@Test
public void fun5() throws Exception{
System.out.println(ud.getTotalCount());
}
@Test
public void fun6() throws Exception{
System.out.println(ud.getById(1));
}
@Test
public void fun7() throws Exception{
System.out.println(ud.getAll());
}
}
进阶内容- JDBCDaoSupport
- 根据连接池创建JDBC模板对象
- 不需要手动准备jdbc模板对象,从父类中获得
[Java] 纯文本查看 复制代码 public class UserDaoImpl extends JdbcDaoSupport implements UserDao {}
- 读取外部的Properties配置
[XML] 纯文本查看 复制代码 <!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties" />
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