spring 整合 mybatis 中数据源的几种配置方式
因为spring 整合mybatis的过程中， 有好几种整合方式，尤其是数据源那块，经常看到不一样的配置方式，总感觉有点乱，所以今天有空总结下。
一、采用org.mybatis.spring.mapper.MapperScannerConfigurer
其实逆向工程也是这种方式
1、数据源配配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 加载配置文件 -->
<context:property-placeholder location="classpath:resource/*.properties" /> <!-- 数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="minIdle" value="5" />
</bean>
<!-- sqlsessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property>
<property name="dataSource" ref="dataSource"></property>
</bean> <!-- 加载mapper代理对象 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.jdd.mapper"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean> </beans>
2、DAO文件
package com.jdd.mapper; import com.jdd.pojo.Employee;
import java.util.List; public interface EmployeeMapper { public Employee getEmployeeById(int id); public List<Employee> findAllEmployees(); }
3、Mapper.xml 文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.jdd.mapper.EmployeeMapper"> <select id="getEmployeeById" parameterType="int" resultType="com.jdd.pojo.Employee">
<![CDATA[
select * from employee where id = #{id};
]]>
</select> <select id="findAllEmployees" resultType="com.jdd.pojo.Employee">
<![CDATA[
select * from employee where status='1';
]]>
</select> </mapper>
这样在service类里就可以直接注入dao接口了
package com.jdd.service.impl; import com.jdd.mapper.EmployeeMapper;
import com.jdd.pojo.Employee;
import com.jdd.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List; @Service("employeeService")
public class EmployeeServiceImpl implements EmployeeService{ @Autowired
private EmployeeMapper employeeMapper; @Override
public Employee getEmployeeById(int id) {
return employeeMapper.getEmployeeById(id);
} @Override
public List<Employee> findAllEmployees() {
return employeeMapper.findAllEmployees();
} }
二、 采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport， 给它注入 sqlSessionFactory的方式
1、数据源配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 加载配置文件 -->
<context:property-placeholder location="classpath:resource/*.properties" /> <!-- 数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="minIdle" value="5" />
</bean> <!-- sqlsessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property>
<property name="dataSource" ref="dataSource"></property>
<property name="mapperLocations" value="classpath:com/jdd/mapper/*.xml"></property>
</bean> </beans>
2、baseDao类
package com.hd.dao; import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import javax.annotation.Resource; public abstract class BaseDao extends SqlSessionDaoSupport { @Resource
public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
super.setSqlSessionFactory(sqlSessionFactory);
} }
3、接口 EmployeeDao.java 类
package com.hd.dao;
import com.hd.pojo.Employee;
import java.util.List;
public interface EmployeeDao {
Employee getEmployeeById(int id);
List<Employee> findAllEmployees();
}
4、dao实现类 EmployeeDaoImpl
package com.hd.dao.impl; import com.hd.dao.BaseDao;
import com.hd.dao.EmployeeDao;
import com.hd.pojo.Employee;
import org.springframework.stereotype.Repository;
import java.util.List; @Repository("employeeDao")
public class EmployeeDaoImpl extends BaseDao implements EmployeeDao { @Override
public Employee getEmployeeById(int id) {
return this.getSqlSession().selectOne("com.jdd.dao.EmployeeDao.getEmployeeById", id);
} @Override
public List<Employee> findAllEmployees() {
return this.getSqlSession().selectList("com.jdd.dao.EmployeeDao.findAllEmployees");
} }
5、这样就可以在service类里注入 employeeDao了
三、采用 org.mybatis.spring.SqlSessionTemplate 模板类
1、数据源文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 加载配置文件 -->
<context:property-placeholder location="classpath:resource/*.properties" /> <!-- 数据库连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="minIdle" value="5" />
</bean> <!-- sqlsessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property>
<property name="dataSource" ref="dataSource"></property>
<property name="mapperLocations" value="classpath:com/jdd/mapper/*.xml"></property>
</bean> <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean> </beans>
2、 basedao.java 类
package com.hd.dao; import org.mybatis.spring.SqlSessionTemplate;
import javax.annotation.Resource; public abstract class BaseDao { public SqlSessionTemplate sqlSessionTemplate;
@Resource
public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
this.sqlSessionTemplate = sqlSessionTemplate;
}
}
3、接口 EmployeeDao.java 类
package com.hd.dao; import com.hd.pojo.Employee;
import java.util.List; public interface EmployeeDao { Employee getEmployeeById(int id); List<Employee> findAllEmployees();
}
4、dao实现类 EmployeeDaoImpl
package com.hd.dao.impl; import com.hd.dao.BaseDao;
import com.hd.dao.EmployeeDao;
import com.hd.pojo.Employee;
import org.springframework.stereotype.Repository;
import java.util.List; @Repository("employeeDao")
public class EmployeeDaoImpl extends BaseDao implements EmployeeDao { @Override
public Employee getEmployeeById(int id) {
return sqlSessionTemplate.selectOne("com.jdd.dao.EmployeeDao.getEmployeeById", id);
} @Override
public List<Employee> findAllEmployees() {
return sqlSessionTemplate.selectList("com.jdd.dao.EmployeeDao.findAllEmployees");
} }
5、同样现在也可以在service类里直接注入 employeeDao使用了。
注：这里basedao的注入比较灵活，也可以注入 SqlSessionFactory， 然后再setter方法里创建 SqlSessionTemplate，如下：
package com.hd.dao; import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionTemplate; import javax.annotation.Resource; public abstract class BaseDao { public SqlSessionTemplate sqlSessionTemplate;
@Resource
public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
sqlSessionTemplate = new SqlSessionTemplate(sqlSessionFactory);
} }
其实不管是采用 继承SqlSessionDaoSupport类， 注入 sqlSessionFactory的方式， 还是直接注入 SqlSessionTemplate 的方式， 本质上是一样的。
如果你采用 注入 sqlSessionFactory的方式， 它在底层也是通过sqlSessionFactory 来创建 SqlSessionTemplate ，然后通过其api来操作。
不信给你们看下 SqlSessionDaoSupport 的源码：
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
// package org.mybatis.spring.support; import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.dao.support.DaoSupport;
import org.springframework.util.Assert; public abstract class SqlSessionDaoSupport extends DaoSupport {
private SqlSession sqlSession;
private boolean externalSqlSession; public SqlSessionDaoSupport() {
} public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
if (!this.externalSqlSession) {
this.sqlSession = new SqlSessionTemplate(sqlSessionFactory);
} } public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
this.sqlSession = sqlSessionTemplate;
this.externalSqlSession = true;
} public SqlSession getSqlSession() {
return this.sqlSession;
} protected void checkDaoConfig() {
Assert.notNull(this.sqlSession, "Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required");
}
}
同样 SqlSessionTemplate 继承了 SqlSession 接口， 因此不管操作哪个效果都一样
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
// package org.mybatis.spring; import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.exceptions.PersistenceException;
import org.apache.ibatis.executor.BatchResult;
import org.apache.ibatis.reflection.ExceptionUtil;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.util.Assert; public class SqlSessionTemplate implements SqlSession {
private final SqlSessionFactory sqlSessionFactory;
private final ExecutorType executorType;
private final SqlSession sqlSessionProxy;
private final PersistenceExceptionTranslator exceptionTranslator; public SqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
this(sqlSessionFactory, sqlSessionFactory.getConfiguration().getDefaultExecutorType());
} public SqlSessionTemplate(SqlSessionFactory sqlSessionFactory, ExecutorType executorType) {
this(sqlSessionFactory, executorType, new MyBatisExceptionTranslator(sqlSessionFactory.getConfiguration().getEnvironment().getDataSource(), true));
} public SqlSessionTemplate(SqlSessionFactory sqlSessionFactory, ExecutorType executorType, PersistenceExceptionTranslator exceptionTranslator) {
Assert.notNull(sqlSessionFactory, "Property 'sqlSessionFactory' is required");
Assert.notNull(executorType, "Property 'executorType' is required");
this.sqlSessionFactory = sqlSessionFactory;
this.executorType = executorType;
this.exceptionTranslator = exceptionTranslator;
this.sqlSessionProxy = (SqlSession)Proxy.newProxyInstance(SqlSessionFactory.class.getClassLoader(), new Class[]{SqlSession.class}, new SqlSessionTemplate.SqlSessionInterceptor());
} public SqlSessionFactory getSqlSessionFactory() {
return this.sqlSessionFactory;
} public ExecutorType getExecutorType() {
return this.executorType;
} public PersistenceExceptionTranslator getPersistenceExceptionTranslator() {
return this.exceptionTranslator;
} public <T> T selectOne(String statement) {
return this.sqlSessionProxy.selectOne(statement);
} public <T> T selectOne(String statement, Object parameter) {
return this.sqlSessionProxy.selectOne(statement, parameter);
} public <K, V> Map<K, V> selectMap(String statement, String mapKey) {
return this.sqlSessionProxy.selectMap(statement, mapKey);
} public <K, V> Map<K, V> selectMap(String statement, Object parameter, String mapKey) {
return this.sqlSessionProxy.selectMap(statement, parameter, mapKey);
} public <K, V> Map<K, V> selectMap(String statement, Object parameter, String mapKey, RowBounds rowBounds) {
return this.sqlSessionProxy.selectMap(statement, parameter, mapKey, rowBounds);
} public <E> List<E> selectList(String statement) {
return this.sqlSessionProxy.selectList(statement);
} public <E> List<E> selectList(String statement, Object parameter) {
return this.sqlSessionProxy.selectList(statement, parameter);
} public <E> List<E> selectList(String statement, Object parameter, RowBounds rowBounds) {
return this.sqlSessionProxy.selectList(statement, parameter, rowBounds);
} public void select(String statement, ResultHandler handler) {
this.sqlSessionProxy.select(statement, handler);
} public void select(String statement, Object parameter, ResultHandler handler) {
this.sqlSessionProxy.select(statement, parameter, handler);
} public void select(String statement, Object parameter, RowBounds rowBounds, ResultHandler handler) {
this.sqlSessionProxy.select(statement, parameter, rowBounds, handler);
} public int insert(String statement) {
return this.sqlSessionProxy.insert(statement);
} public int insert(String statement, Object parameter) {
return this.sqlSessionProxy.insert(statement, parameter);
} public int update(String statement) {
return this.sqlSessionProxy.update(statement);
} public int update(String statement, Object parameter) {
return this.sqlSessionProxy.update(statement, parameter);
} public int delete(String statement) {
return this.sqlSessionProxy.delete(statement);
} public int delete(String statement, Object parameter) {
return this.sqlSessionProxy.delete(statement, parameter);
} public <T> T getMapper(Class<T> type) {
return this.getConfiguration().getMapper(type, this);
} public void commit() {
throw new UnsupportedOperationException("Manual commit is not allowed over a Spring managed SqlSession");
} public void commit(boolean force) {
throw new UnsupportedOperationException("Manual commit is not allowed over a Spring managed SqlSession");
} public void rollback() {
throw new UnsupportedOperationException("Manual rollback is not allowed over a Spring managed SqlSession");
} public void rollback(boolean force) {
throw new UnsupportedOperationException("Manual rollback is not allowed over a Spring managed SqlSession");
} public void close() {
throw new UnsupportedOperationException("Manual close is not allowed over a Spring managed SqlSession");
} public void clearCache() {
this.sqlSessionProxy.clearCache();
} public Configuration getConfiguration() {
return this.sqlSessionFactory.getConfiguration();
} public Connection getConnection() {
return this.sqlSessionProxy.getConnection();
} public List<BatchResult> flushStatements() {
return this.sqlSessionProxy.flushStatements();
} private class SqlSessionInterceptor implements InvocationHandler {
private SqlSessionInterceptor() {
} public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
SqlSession sqlSession = SqlSessionUtils.getSqlSession(SqlSessionTemplate.this.sqlSessionFactory, SqlSessionTemplate.this.executorType, SqlSessionTemplate.this.exceptionTranslator); Object unwrapped;
try {
Object result = method.invoke(sqlSession, args);
if (!SqlSessionUtils.isSqlSessionTransactional(sqlSession, SqlSessionTemplate.this.sqlSessionFactory)) {
sqlSession.commit(true);
} unwrapped = result;
} catch (Throwable var11) {
unwrapped = ExceptionUtil.unwrapThrowable(var11);
if (SqlSessionTemplate.this.exceptionTranslator != null && unwrapped instanceof PersistenceException) {
SqlSessionUtils.closeSqlSession(sqlSession, SqlSessionTemplate.this.sqlSessionFactory);
sqlSession = null;
Throwable translated = SqlSessionTemplate.this.exceptionTranslator.translateExceptionIfPossible((PersistenceException)unwrapped);
if (translated != null) {
unwrapped = translated;
}
} throw (Throwable)unwrapped;
} finally {
if (sqlSession != null) {
SqlSessionUtils.closeSqlSession(sqlSession, SqlSessionTemplate.this.sqlSessionFactory);
} } return unwrapped;
}
}
}
spring 整合 mybatis 中数据源的几种配置方式的更多相关文章
- Spring+Mybatis多数据源的一种实现方式，支持事务
最近一个项目用到了多个数据库,所以需要实现动态切换数据源来查询数据,http://www.cnblogs.com/lzrabbit/p/3750803.html这篇文章让我受益匪浅,提供了一种自动切换 ...
- spring 中 hibernate 的 2种 配置方式（新旧 2种方式）
Spring对hibernate配置文件hibernate.cfg.xml的集成,来取代hibernate.cfg.xml的配置 Spring对hibernate配置文件hibernate.cfg.x ...
- SpringMVC中HandlerMapping的三种配置方式
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE beans PUBLIC "-/ ...
- 简单探讨spring整合mybatis时sqlSession不需要释放关闭的问题
https://blog.csdn.net/RicardoDing/article/details/79899686 近期,在使用spring和mybatis框架编写代码时,sqlSession不需要 ...
- 【springboot spring mybatis】看我怎么将springboot与spring整合mybatis与druid数据源
目录 概述 1.mybatis 2.druid 壹:spring整合 2.jdbc.properties 3.mybatis-config.xml 二:java代码 1.mapper 2.servic ...
- Maven项目中Spring整合Mybatis
Maven项目中Spring整合Mybatis 添加jar包依赖 spring需要的jar包依赖 <dependency> <groupId>org.springframewo ...
- Spring学习总结（五）——Spring整合MyBatis（Maven+MySQL）二
接着上一篇博客<Spring整合MyBatis(Maven+MySQL)一>继续. Spring的开放性和扩张性在J2EE应用领域得到了充分的证明,与其他优秀框架无缝的集成是Spring最 ...
- spring整合mybatis(hibernate)配置
一.Spring整合配置Mybatis spring整合mybatis可以不需要mybatis-config.xml配置文件,直接通过spring配置文件一步到位.一般需要具备如下几个基本配置. 1. ...
- Mybatis学习（六）————— Spring整合mybatis
一.Spring整合mybatis思路 非常简单,这里先回顾一下mybatis最基础的根基, mybatis,有两个配置文件 全局配置文件SqlMapConfig.xml(配置数据源,全局变量,加载映 ...
随机推荐
- ECMAScript 6之Set和Map数据结构
Set 基本用法 ES6提供了新的数据结构Set.它类似于数组,但是成员的值都是唯一的,没有重复的值. Set本身是一个构造函数,用来生成Set数据结构. var s = new Set(); [2, ...
- 【Vbox】centos虚拟机安装usb网卡驱动
前面安装增强pack之后 usb设备是可以识别了,但是无法正常使用,应该是无线网卡驱动没有的原因. 查看usb设备 os:centos6.6 内核:2.6.32-504.el6.x86_64 [roo ...
- 5个你不知道的HTML5的接口
原文地址:5 HTML5 APIs You Didn't Know Existed 原文日期: 2010年09月27日 翻译日期: 2013年8月7日 当人们看到或者说出"HTML5&quo ...
- Uva - 12174 - Shuffle
用滑动窗口的思想,用一个数组保存每个数在窗口中出现的次数.再用一个变量记录在窗口中恰好出现一次的的数的个数,这样可以枚举所有可能的答案,判断它所对应的所有串口,当且仅当所有的串口均满足要求时这个答案可 ...
- 【翻译】从Store生成Checkbox Group
原文:Ext JS: Generating a Checkbox Group from a Store Ext JS的checkbox group可以用来将复选框组合成一个单一的逻辑字段.由于复选框时 ...
- java的map
Map是一种把键对象和值对象进行关联的容器,而一个值对象又可以是一个Map,依次类推,这样就可形成一个多级映射. 这里有详细的论述http://www.oracle.com/technetwork/c ...
- ibatis 数据库时间 插入数据
<insert id="insert" parameterClass="ToDoBar" > <selectKey resultCla ...
- 小强的HTML5移动开发之路（3）——HTML5与HTML4比较
来自:http://blog.csdn.net/dawanganban/article/details/17652873 在前面介绍了HTML5的新特性,新标签的使用,智能表单设计,引入多媒体对象,C ...
- 分布式进阶(十六)Zookeeper入门基础
Zookeeper入门基础 前言 在Zookeeper中,znode是一个跟Unix文件系统路径相似的节点,可以往这个节点存储或获取数据.如果在创建znode时Flag设置为EPHEMERAL,那么当 ...
- 【一天一道LeetCode】#42. Trapping Rain Water
一天一道LeetCode系列 (一)题目 Given n non-negative integers representing an elevation map where the width of ...