1. 数据源也就是jdbc.properties，因为是主从读写分离，那么肯定有两个数据源了
jdbc.driver=org.mariadb.jdbc.Driver # 从库，只读 slave.jdbc.url=jdbc:mariadb://xxx.xxx.xxx.xxx:3306/xxx?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&noAccessToProcedureBodies=true&autoReconnect=true slave.jdbc.username=xxx slave.jdbc.password=xxx # 主库，需要写 master.jdbc.url=jdbc:mariadb://xxx.xxx.xxx.xxx:3306/xxx?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&noAccessToProcedureBodies=true&autoReconnect=true master.jdbc.username=xxx master.jdbc.password=xxx
这个非常简单和普通的区别不是很大，另外数据库的驱动是：mariadb，动下面就是第二个配置文件spring.xml
2. spring.xml
<?xml version="1.0" encoding="UTF-8"?> <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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd "> <!-- Import properties file --> <context:property-placeholder location="classpath:jdbc.properties" /> <!-- Auto Scan --> <context:component-scan base-package="cn.bridgeli.demo" /> </beans>
这个文件很简单，有两个作用，①. 引入数据源配置文件；②. spring扫描的文件的路径
3. spring-mybatis.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd "> <bean id="slaveDataSourceImpl" class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"> <property name="driverClass" value="${jdbc.driver}" /> <property name="jdbcUrl" value="${slave.jdbc.url}" /> <property name="username" value="${slave.jdbc.username}" /> <property name="password" value="${slave.jdbc.password}" /> <!-- 检查数据库连接池中空闲连接的间隔时间，单位是分，默认值：240，如果要取消则设置为0 --> <property name="idleConnectionTestPeriodInMinutes" value="10" /> <!-- 连接池中未使用的链接最大存活时间，单位是分，默认值：60，如果要永远存活设置为0 --> <property name="idleMaxAgeInMinutes" value="10" /> <!-- 每个分区最大的连接数 --> <property name="maxConnectionsPerPartition" value="20" /> <!-- 每个分区最小的连接数 --> <property name="minConnectionsPerPartition" value="10" /> <!-- 分区数 ，默认值2，最小1，推荐3-4，视应用而定 --> <property name="partitionCount" value="3" /> <!-- 每次去拿数据库连接的时候一次性要拿几个,默认值：2 --> <property name="acquireIncrement" value="3" /> <!-- 缓存prepared statements的大小，默认值：0 --> <property name="statementsCacheSize" value="50" /> <!-- 在做keep-alive的时候的SQL语句 --> <property name="connectionTestStatement" value="select 1 from dual" /> <!-- 在每次到数据库取连接的时候执行的SQL语句，只执行一次 --> <property name="initSQL" value="select 1 from dual" /> <property name="closeConnectionWatch" value="false" /> <property name="logStatementsEnabled" value="true" /> <property name="transactionRecoveryEnabled" value="true" /> </bean> <bean id="masterDataSourceImpl" class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"> <property name="driverClass" value="${jdbc.driver}" /> <property name="jdbcUrl" value="${master.jdbc.url}" /> <property name="username" value="${master.jdbc.username}" /> <property name="password" value="${master.jdbc.password}" /> <!-- 检查数据库连接池中空闲连接的间隔时间，单位是分，默认值：240，如果要取消则设置为0 --> <property name="idleConnectionTestPeriodInMinutes" value="10" /> <!-- 连接池中未使用的链接最大存活时间，单位是分，默认值：60，如果要永远存活设置为0 --> <property name="idleMaxAgeInMinutes" value="10" /> <!-- 每个分区最大的连接数 --> <property name="maxConnectionsPerPartition" value="20" /> <!-- 每个分区最小的连接数 --> <property name="minConnectionsPerPartition" value="10" /> <!-- 分区数 ，默认值2，最小1，推荐3-4，视应用而定 --> <property name="partitionCount" value="3" /> <!-- 每次去拿数据库连接的时候一次性要拿几个,默认值：2 --> <property name="acquireIncrement" value="3" /> <!-- 缓存prepared statements的大小，默认值：0 --> <property name="statementsCacheSize" value="50" /> <!-- 在做keep-alive的时候的SQL语句 --> <property name="connectionTestStatement" value="select 1 from dual" /> <!-- 在每次到数据库取连接的时候执行的SQL语句，只执行一次 --> <property name="initSQL" value="select 1 from dual" /> <property name="closeConnectionWatch" value="false" /> <property name="logStatementsEnabled" value="true" /> <property name="transactionRecoveryEnabled" value="true" /> </bean> <!-- DataSource/Master --> <bean id="masterDataSource" class="org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy"> <property name="targetDataSource" ref="masterDataSourceImpl" /> </bean> <bean id="masterTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="masterDataSource" /> </bean> <bean id="masterTransactionTemplate" class="org.springframework.transaction.support.TransactionTemplate"> <property name="transactionManager" ref="masterTransactionManager" /> </bean> <!-- DataSource/Slave --> <bean id="slaveDataSource" class="org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy"> <property name="targetDataSource" ref="slaveDataSourceImpl" /> </bean> <bean id="slaveTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="slaveDataSource" /> </bean> <bean id="slaveTransactionTemplate" class="org.springframework.transaction.support.TransactionTemplate"> <property name="transactionManager" ref="slaveTransactionManager" /> </bean> <!-- Mybatis/Master --> <bean id="masterSqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="masterDataSource"></property> <property name="configLocation" value="classpath:mybatis.xml" /> <property name="typeAliasesPackage" value="cn.bridgeli.demo.entity" /> <property name="mapperLocations"> <list> <value>classpath:cn/bridgeli/demo/mapper/master/*.xml</value> </list> </property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="cn.bridgeli.demo.mapper.master" /> <property name="sqlSessionFactoryBeanName" value="masterSqlSessionFactory" /> </bean> <!-- Mybatis/Slave --> <bean id="slaveSqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="slaveDataSource"></property> <property name="configLocation" value="classpath:mybatis.xml" /> <property name="typeAliasesPackage" value="cn.bridgeli.demo.entity" /> <property name="mapperLocations"> <list> <value>classpath:cn/bridgeli/demo/mapper/slave/*.xml</value> </list> </property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="cn.bridgeli.demo.mapper.slave" /> <property name="sqlSessionFactoryBeanName" value="slaveSqlSessionFactory" /> </bean> <!-- Configuration transaction advice --> <tx:advice id="txAdvice" transaction-manager="masterTransactionManager"> <tx:attributes> <tx:method name="add*" propagation="REQUIRED" /> <tx:method name="update*" propagation="REQUIRED" /> <tx:method name="delete*" propagation="REQUIRED" /> <tx:method name="get*" read-only="true" propagation="SUPPORTS" /> <tx:method name="list*" read-only="true" propagation="SUPPORTS" /> </tx:attributes> </tx:advice> <!-- Configuration transaction aspect --> <aop:config> <aop:pointcut id="systemServicePointcut" expression="execution(* cn.bridgeli.demo.service.*.*(..))" /> <aop:advisor advice-ref="txAdvice" pointcut-ref="systemServicePointcut" /> </aop:config> </beans>
这个配置文件老夫是完整的copy了下来，看起来也比较易懂，就不做解释了，需要说明的mybatis下那些dao的接口，分别对应cn.bridgeli.demo.mapper.master、cn.bridgeli.demo.mapper.slave，cn.bridgeli.demo.mapper.master下的这些dao接口是要写的，另一个是读的，这些接口对应的配置文件肯定就是他们对应的文件夹下面的xml文件了，在将来的项目中几乎可以照抄
4. mybatis的配置文件mybatis.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <setting name="cacheEnabled" value="true" /> <setting name="lazyLoadingEnabled" value="true" /> </settings> <plugins> <plugin interceptor="com.github.miemiedev.mybatis.paginator.OffsetLimitInterceptor"> <property name="dialectClass" value="com.github.miemiedev.mybatis.paginator.dialect.MySQLDialect" /> <property name="asyncTotalCount" value="true" /> </plugin> </plugins> </configuration>
这个配置文件就一个分页，在前一篇文章中写过，就不多做解释了
5. 最后因为用的数据源的问题，就把pom.xml文件需要引入的几个依赖，也摘出如下
<dependency> <groupId>com.jolbox</groupId> <artifactId>bonecp</artifactId> <version>0.8.0.RELEASE</version> </dependency> <dependency> <groupId>com.jolbox</groupId> <artifactId>bonecp-spring</artifactId> <version>0.8.0.RELEASE</version> </dependency> <dependency> <groupId>org.mariadb.jdbc</groupId> <artifactId>mariadb-java-client</artifactId> <version>1.1.7</version> </dependency>
需要说明的我们用常见的c3p0或者dbcp的数据源也是可以的，至于本例中为什么用了这个没有听说过的jolbox（老夫是没听说过），老夫也不知道，知道他和常见的c3p0和dbcp有什么区别的请留言交流，谢谢