Spring框架基础（中）

Spring对不同持久化技术进行支持

JDBC

导入spring-jdbc-4.3.5.RELEASE.jar、spring-tx-4.3.5.RELEASE.jar
创建对象，设置数据库信息
创建jdbcTemplate对象，设置数据源

调用jdbcTemplate对象里面对方法实现操作

public class TestDao {/*** 添加指定数据表的数据*/public void insertUser() {try {//导入配置文件InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");//
            DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();driverManagerDataSource.setJdbcUrl(driver);driverManagerDataSource.setJdbcUrl(url);driverManagerDataSource.setUser(username);driverManagerDataSource.setPassword(password);//数据库语句String sql = "insert into user (username,password,email,root,register_time) values (?,?,?,?,?) ";//
            JdbcTemplate jdbcTemplate = new JdbcTemplate(driverManagerDataSource);int rows = jdbcTemplate.update(sql,"rabbit","rabbit","rabbit@qq.com",1,"2019-3-2");System.out.println("rows="+rows);} catch (IOException e) {e.printStackTrace();}}/*** 更新指定数据表的数据*/public void updateUser() {try {//导入配置文件InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");//
            DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();driverManagerDataSource.setJdbcUrl(driver);driverManagerDataSource.setJdbcUrl(url);driverManagerDataSource.setUser(username);driverManagerDataSource.setPassword(password);//数据库语句
         String sql = "update user set phone = ? where username = ?";//
            JdbcTemplate jdbcTemplate = new JdbcTemplate(driverManagerDataSource);int rows = jdbcTemplate.update(sql,"13812392132","rabbit");System.out.println("rows=" + rows);} catch (IOException e) {e.printStackTrace();}}/*** 查询全部数据*/public void selectAllUser() {try {//导入配置文件InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");//
            DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();driverManagerDataSource.setJdbcUrl(driver);driverManagerDataSource.setJdbcUrl(url);driverManagerDataSource.setUser(username);driverManagerDataSource.setPassword(password);//数据库语句
          String sql = "select * from user";//
            JdbcTemplate jdbcTemplate = new JdbcTemplate(driverManagerDataSource);List<Map<String, Object>> maps = jdbcTemplate.queryForList(sql);System.out.println("maps=" + maps);} catch (IOException e) {e.printStackTrace();}}/*** 删除指定数据*/public void deleteUser() {try {//导入配置文件InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");//
            DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();driverManagerDataSource.setJdbcUrl(driver);driverManagerDataSource.setJdbcUrl(url);driverManagerDataSource.setUser(username);driverManagerDataSource.setPassword(password);//数据库语句
          String sql = "delete from user where username = ?";//
            JdbcTemplate jdbcTemplate = new JdbcTemplate(driverManagerDataSource);int row = jdbcTemplate.update(sql, "rabbit");System.out.println("row=" + row);} catch (IOException e) {e.printStackTrace();}}/*** 查询指定数据表的记录数*/public void selectCountUser() {try {//导入配置文件InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");//
            DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();driverManagerDataSource.setJdbcUrl(driver);driverManagerDataSource.setJdbcUrl(url);driverManagerDataSource.setUser(username);driverManagerDataSource.setPassword(password);//数据库语句
         String sql = "select count(*) from user";//
            JdbcTemplate jdbcTemplate = new JdbcTemplate(driverManagerDataSource);//第一个参数sql语句，第二个参数返回的数据类型Integer count = jdbcTemplate.queryForObject(sql,Integer.class);System.out.println("count=" + count);} catch (IOException e) {e.printStackTrace();}}public void   selectUser();() {try {//导入配置文件InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");//
            DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();driverManagerDataSource.setJdbcUrl(driver);driverManagerDataSource.setJdbcUrl(url);driverManagerDataSource.setUser(username);driverManagerDataSource.setPassword(password);//数据库语句
          String sql = "select * from user where username = ?";User user = jdbcTemplate.queryForObject(sql, new NewRowMapper(), "rabbit");JSONObject jsonObject = JSONObject.fromObject(user);System.out.println(jsonObject + "");} catch (IOException e) {e.printStackTrace();}}/*** 处理查询结果集*/class NewRowMapper implements RowMapper<User> {@Overridepublic User mapRow(ResultSet resultSet, int i) throws SQLException {try {Class<?> newClass = Class.forName("cn.muriel.auto.pojo.User");Object o = newClass.newInstance();for (int j = 1; j <= resultSet.getMetaData().getColumnCount(); j++) {String name = resultSet.getMetaData().getColumnName(j);String type = resultSet.getMetaData().getColumnTypeName(j);//针对只有一次_的情况，多次则可用递归if (name.contains("_")) {int position = name.indexOf("_");String smailChar = name.substring(position + 1, position + 2).toUpperCase();name = name.substring(0, position) + smailChar + name.substring(position + 2, name.length());}Field declaredField = newClass.getDeclaredField(name);if (declaredField != null) {declaredField.setAccessible(true);if (type.equals("INT"))declaredField.set(o, resultSet.getInt(name));else if (type.equals("VARCHAR"))declaredField.set(o, resultSet.getString(name));}}return (User) o;} catch (ClassNotFoundException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InstantiationException e) {e.printStackTrace();} catch (NoSuchFieldException e) {e.printStackTrace();}return null;}}}/**
* 测试代码
*/public static void main(String[] args) {Test01 test01 = (Test01) applicationContext.getBean("test01");test01.test01();*/TestDao dao = new TestDao();dao.insertUser();dao.updateUser();dao.selectAllUser();dao.selectUser();dao.selectCountUser();
}

spring配置c3p0连接池

导入mchange-commons-java-0.2.11.jar、c3p0-0.9.5.2.jar

连接连接池

代码实现

  InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("db.properties");Properties properties = new Properties();try {properties.load(inputStream);//获取参数String driver = properties.getProperty("jdbc.driver");String url = properties.getProperty("jdbc.url");String username = properties.getProperty("jdbc.username");String password = properties.getProperty("jdbc.password");ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();comboPooledDataSource.setDriverClass(driver);comboPooledDataSource.setJdbcUrl(url);comboPooledDataSource.setUser(username);comboPooledDataSource.setPassword(password);} catch (IOException e) {e.printStackTrace();} catch (PropertyVetoException e) {e.printStackTrace();}

注入实现

<?xml version="1.0" encoding="UTF-8" ?>
<!--http://www.springframework.org/schema/context/spring-context.xsd：用于注解的约束-->
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"><!-- 自动注入<context:component-scan base-package="cn.muriel.auto.dao"/> --><context:property-placeholder location="db.properties"/><!-- 配置注入 --><bean id="userDao" class="cn.muriel.auto.dao.UserDao"/><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${jdbc.driver}"></property><property name="jdbcUrl" value="${jdbc.url}"></property><property name="user" value="${jdbc.username}"></property><property name="password" value="${jdbc.password}"></property></bean><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"/></bean><bean id="testDao" class="cn.muriel.auto.dao.TestDao"><property name="jdbcTemplate" ref="jdbcTemplate"/></bean></beans>

Hibernate
Ibatis（MyBatis）
JPA

Spring的事务管理

什么是事务
事务的特性
不考虑隔离性产生读问题
解决读问题
- 设置隔离级别

spring事务管理两种方式

编程式事务管理

声明式事务管理

基于xml配置文件实现

 <!-- 配置事务管理器 --><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><!-- 注入dataSource --><property name="dataSource" ref="dataSource"/></bean><!-- 配置事务增强 --><tx:advice id="txadvice" transaction-manager="transactionManager"><!-- 做事务操作 --><tx:attributes><!--设置进行事务操作的方法匹配规则name：匹配名字propagation：默认。--><tx:method name="insert*" propagation="REQUIRED"/></tx:attributes></tx:advice><!-- 配置切面 --><aop:config><!-- 切入点 --><aop:pointcut id="pointcut1" expression="* (cn.muriel.auto.service.TestService.*)(..)"/><!-- 切面 --><aop:advisor advice-ref="txadvice" pointcut-ref="pointcut1"/></aop:config>

基于注解实现

  <!-- 配置事务管理器 --><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><!-- 注入dataSource --><property name="dataSource" ref="dataSource"/></bean><!-- 配置事务注解 --><tx:annotation-driven transaction-manager="transactionManager"/>/*** 使用事务的方法所在类上面添加注解*/
@Transactional
public class TestService {}

spring事务管理高层抽象主要包括3个接口
- PlatformTransactionManager（事务管理器）
  - spring针对不同的dao层框架，提供接口不同的实现类
  - 首先都要配置事务管理器
- TransactionDefinition（事务定义信息（隔离、传播、超时、只读））
- TransactionStatus（事务具体运行状态）

转载于:https://www.cnblogs.com/fatRabbit-/p/10562544.html

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