标签:viso 问题: repeat values cte poi color cal ted
JDBCTemplate => JDBC模板对象
与DBUtils中的QueryRunner非常相似.
//0 准备连接池 ComboPooledDataSource dataSource = new ComboPooledDataSource(); dataSource.setDriverClass("com.mysql.jdbc.Driver"); dataSource.setJdbcUrl("jdbc:mysql:///xieyupeng"); dataSource.setUser("root"); dataSource.setPassword("1234"); //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);
4+2:4代表:
2代表:com.springsource.org.apache.commons.logging-1.1.1.jar、com.springsource.org.apache.log4j-1.2.15.jar(老版本要导入的,导入可以保证一定能运行)
spring-test、spring-aop、junit4类库
c3p0连接池、JDBC驱动
spring-jdbc、spring-tx事务
//使用JDBC模板实现增删改查 public class UserDaoImpl extends JdbcDaoSupport implements UserDao { @Override public void save(User u) { String sql = "insert into t_user values(null,?) "; super.getJdbcTemplate().update(sql, u.getName()); } @Override public void delete(Integer id) { String sql = "delete from t_user where id = ? "; super.getJdbcTemplate().update(sql,id); } @Override public void update(User u) { String sql = "update t_user set name = ? where id=? "; 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; } }
依赖关系
<!-- 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>
//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()); } }
public class UserDaoImpl extends JdbcDaoSupport
<!-- 3.将UserDao放入spring容器(继承JDBCDaoSupport,直接注入dataSourse即可) --> <bean name="userDao" class="cn.itcast.a_jdbctemplate.UserDaoImpl" > <!-- <property name="jt" ref="jdbcTemplate" ></property> --> <property name="dataSource" ref="dataSource" ></property> </bean>
db.properties 注意加前缀(更好区分,防止重名)
jdbc.jdbcUrl=jdbc:mysql:///hibernate_32
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=1234
<!-- 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>
事务特性:acid
事务并发问题:脏读、不可重复读、幻读
事务的隔离级别:1 读未提交、2 读已提交、4 可重复读、8 串行化
事务操作:打开事务、提交事务、回滚事务
因为在不同平台,操作事务的代码各不相同.spring提供了一个接口
DataSourceTransactionManager
HibernateTransitionmanager
注意:在spring中玩事务管理.最为核心的对象就是TransactionManager对象
事务的隔离级别:1 读未提交、2 读已提交、4 可重复读、8 串行化
是否只读:true 只读、false 可操作
事务的传播行为:
<!-- 事务核心管理器,封装了所有事务操作. 依赖于连接池 --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" > <property name="dataSource" ref="dataSource" ></property> </bean>
<!-- 事务模板对象 --> <bean name="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate" > <property name="transactionManager" ref="transactionManager" ></property> </bean>
<!-- 3.Service--> <bean name="accountService" class="cn.itcast.service.AccountServiceImpl" > <property name="ad" ref="accountDao" ></property> <property name="tt" ref="transactionTemplate" ></property> </bean>
public void transfer(final Integer from,final Integer to,final Double money) { tt.execute(new TransactionCallbackWithoutResult() { @Override protected void doInTransactionWithoutResult(TransactionStatus arg0) { //减钱 ad.decreaseMoney(from, money); int i = 1/0;//触发错误,验证代码是否正确 //加钱 ad.increaseMoney(to, money); } }); }
aop、aspect、aop联盟和weaving织入包
beans: 最基本
context:读取properties配置
aop:配置aop
tx:配置事务通知
<!-- 配置事务通知 --> <tx:advice id="txAdvice" transaction-manager="transactionManager" > <tx:attributes> <!-- 以方法为单位,指定方法应用什么事务属性 isolation:隔离级别 propagation:传播行为 read-only:是否只读 --> <tx:method name="save*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> <tx:method name="persist*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> <tx:method name="update*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> <tx:method name="modify*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> <tx:method name="delete*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> <tx:method name="remove*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> <tx:method name="get*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true" /> <tx:method name="find*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true" /> <tx:method name="transfer" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="false" /> </tx:attributes> </tx:advice>
<!-- 配置织入 --> <aop:config > <!-- 配置切点表达式 --> <aop:pointcut expression="execution(* cn.itcast.service.*ServiceImpl.*(..))" id="txPc"/> <!-- 配置切面 : 通知+切点 advice-ref:通知的名称 pointcut-ref:切点的名称 --> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPc" /> </aop:config>
<!-- 开启使用注解管理aop事务 --> <tx:annotation-driven/>
@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=true) public class AccountServiceImpl implements AccountService { private AccountDao ad ; private TransactionTemplate tt; @Override @Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false) public void transfer(final Integer from,final Integer to,final Double money) {
JAVAEE——spring03:spring整合JDBC和aop事务
标签:viso 问题: repeat values cte poi color cal ted
原文地址:http://www.cnblogs.com/xieyupeng/p/7100660.html