Demo项目采用Springboot 2.0.3RELEASE版本
使用IDEA创建Spring boot项目后，在pom.xml中添加如下依赖
<!-- MyBaits -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- PageHelper分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
<!-- Druid 数据连接池依赖 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.18</version>
</dependency>
<!-- oracle连接驱动 -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.4</version>
</dependency>
<!-- MySQL 连接驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<build>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<executions>
<execution>
<id>Generate MyBatis Artifacts</id>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<!-- generator 工具配置文件的位置 -->
<configurationFile>src/main/resources/generator/generatorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
<dependencies>
<!-- mysql连接驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
<!-- oracle连接驱动 -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.4</version>
</dependency>
<!-- MyBatis generator -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.2</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<classifier>exec</classifier>
</configuration>
</plugin>
</plugins>
</build>
配置文件使用yml格式，在application.yml文件中添加数据库连接信息，本示例中同时使用MySQL和Oracle数据库作为数据库源
spring:
datasource:
mysql:
url: jdbc:mysql://localhost:3306/customerservice?useUnicode=true&characterEncoding=utf8&useSSL=false
username: root
password: 123
driverClassName: com.mysql.jdbc.Driver
initialSize: 5 #初始化大小
minIdle: 5 #最小
maxActive: 20 #最大
maxWait: 60000 #等待超时时间
timeBetweenEvictionRunsMillis: 60000 # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
minEvictableIdleTimeMillis: 30000 # 配置一个连接在池中最小生存的时间，单位是毫秒
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true #是否在连接空闲一段时间后检测其可用性
testOnBorrow: false #是否在获得连接后检测其可用性
testOnReturn: false #是否在连接放回连接池后检测其可用性
poolPreparedStatements: true #打开PSCache，并且指定每个连接上PSCache的大小
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,wall,log4j2 #配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000 # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
type: com.alibaba.druid.pool.DruidDataSource
oracle:
url: jdbc:oracle:thin:@oracle:1521:orcl
username: scott
password: orcl
driverClassName: oracle.jdbc.driver.OracleDriver
initialSize: 5 #初始化大小
minIdle: 5 #最小
maxActive: 20 #最大
maxWait: 60000 #等待超时时间
timeBetweenEvictionRunsMillis: 60000 # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
minEvictableIdleTimeMillis: 30000 # 配置一个连接在池中最小生存的时间，单位是毫秒
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true #是否在连接空闲一段时间后检测其可用性
testOnBorrow: false #是否在获得连接后检测其可用性
testOnReturn: false #是否在连接放回连接池后检测其可用性
poolPreparedStatements: true #打开PSCache，并且指定每个连接上PSCache的大小
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,wall,log4j2 #配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000 # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
type: com.alibaba.druid.pool.DruidDataSource
分别新建MySQL和Oracle数据源的配置类，如下：
@Configuration
@MapperScan(basePackages = DataSource1Config.BASE_PACKAGE, sqlSessionFactoryRef = "datasource1SqlSessionFactory")
public class DataSource1Config {
private static final Logger log = LogManager.getLogger(DataSource1Config.class);
static final String BASE_PACKAGE = "com.transcend.demo.dao.datasource1";
private static final String MAPPER_LOCATION = "classpath:mapper/datasource1/*.xml";
@Primary
@Bean(name = "datasource1")
@ConfigurationProperties(prefix = "spring.datasource.mysql")
public DataSource datasource1() {
// return DataSourceBuilder.create().type(DruidDataSource.class).build();
log.info("datasource1 开始初始化。");
return new DruidDataSource();
}
@Primary
@Bean(name = "datasource1TransactionManager")
public DataSourceTransactionManager datasource1Transaction(@Qualifier("datasource1") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Primary
@Bean(name = "datasource1SqlSessionFactory")
public SqlSessionFactory datasource1SqlSessionFactory(@Qualifier("datasource1") DataSource dataSource) throws Exception {
final SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(DataSource1Config.MAPPER_LOCATION));
//添加PageHelper插件
Interceptor interceptor = new PageInterceptor();
Properties properties = new Properties();
//数据库
properties.setProperty("helperDialect", "mysql");
//是否将参数offset作为PageNum使用
properties.setProperty("offsetAsPageNum", "true");
//是否进行count查询
properties.setProperty("rowBoundsWithCount", "true");
//是否分页合理化
properties.setProperty("reasonable", "false");
interceptor.setProperties(properties);
factoryBean.setPlugins(new Interceptor[] {interceptor});
return factoryBean.getObject();
}
@Primary
@Bean(name = "datasource1SqlSessionTemplate")
public SqlSessionTemplate datasource1SqlSessionTemplate(@Qualifier("datasource1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
@Configuration
@MapperScan(basePackages = DataSource2Config.BASE_PACKAGE,sqlSessionFactoryRef = "datasource2SqlSessionFactory")
public class DataSource2Config {
private static final Logger log = LogManager.getLogger(DataSource2Config.class);
static final String BASE_PACKAGE = "com.transcend.demo.dao.datasource2";
private static final String MAPPER_LOCATION = "classpath:mapper/datasource2/*.xml";
@Bean(name = "datasource2")
@ConfigurationProperties(prefix = "spring.datasource.oracle")
public DataSource datasource2() {
// return DataSourceBuilder.create().type(DruidDataSource.class).build();
log.info("datasource2 开始初始化。");
return new DruidDataSource();
}
@Bean(name = "datasource2TransactionManager")
public DataSourceTransactionManager datasource2Transaction(@Qualifier("datasource2") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "datasource2SqlSessionFactory")
public SqlSessionFactory datasource2SqlSessionFactory(@Qualifier("datasource2") DataSource dataSource) throws Exception {
final SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(DataSource2Config.MAPPER_LOCATION));
//添加PageHelper插件
Interceptor interceptor = new PageInterceptor();
Properties properties = new Properties();
//数据库
properties.setProperty("helperDialect", "oracle");
//是否将参数offset作为PageNum使用
properties.setProperty("offsetAsPageNum", "true");
//是否进行count查询
properties.setProperty("rowBoundsWithCount", "true");
//是否分页合理化
properties.setProperty("reasonable", "false");
interceptor.setProperties(properties);
factoryBean.setPlugins(new Interceptor[] {interceptor});
return factoryBean.getObject();
}
@Bean(name = "datasource2SqlSessionTemplate")
public SqlSessionTemplate datasource2SqlSessionTemplate(@Qualifier("datasource2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
配置PageHelper分页插件后，由于多数据源，会出现 在系统中发现了多个分页插件，请检查系统配置！
此时需要在 Springboot启动类上添加
@SpringBootApplication(exclude = PageHelperAutoConfiguration.class)接下来就是配置 Druid监控，创建DruidConfig.java文件，如下：
@Configuration
@EnableTransactionManagement
public class DruidConfig {
private static final Logger log = LogManager.getLogger(DruidConfig.class);
@Bean
public ServletRegistrationBean<StatViewServlet> druidServlet() {
log.info("开始Druid Servlet初始化配置...");
ServletRegistrationBean<StatViewServlet> servletRegistrationBean = new ServletRegistrationBean<>();
servletRegistrationBean.setServlet(new StatViewServlet());
servletRegistrationBean.addUrlMappings("/druid/*");
Map<String, String> initParameters = new HashMap<>();
//用户名
initParameters.put("loginUsername", "admin");
//密码
initParameters.put("loginPassword", "123");
// 禁用HTML页面上的“Reset All”功能
initParameters.put("resetEnable", "false");
// IP白名单 (没有配置或者为空，则允许所有访问)
initParameters.put("allow", "127.0.0.1");
// IP黑名单 (存在共同时，deny优先于allow)
initParameters.put("deny", "");
servletRegistrationBean.setInitParameters(initParameters);
return servletRegistrationBean;
}
@Bean
public FilterRegistrationBean<WebStatFilter> filterRegistrationBean() {
FilterRegistrationBean<WebStatFilter> filterRegistrationBean = new FilterRegistrationBean<>();
filterRegistrationBean.setFilter(new WebStatFilter());
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
}
至此，MyBatis以及druid和多数据源 的配置已完成，不过没有mapper.xml并不能成功运行项目，需要首先通过MyBatis-generator来生成。在resource文件夹下创建generator文件夹，并创建generatorConfig.xml文件，如下为generatorConfig.xml文件（参考https://blog.csdn.net/jjlovefj/article/details/71439091）：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--数据库驱动-->
<classPathEntry location="F:\workspace\niuwa-p2ps\WebContent\WEB-INF\lib\mysql-connector-java-5.1.25.jar"/>
<context id="myBatis3" targetRuntime="MyBatis3">
<property name="mergeable" value="true" />
<property name="javaFileEncoding" value="UTF-8" />
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接地址账号密码-->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost/test" userId="root" password="root">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="com.jiangjian.model" targetProject="src">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--生成映射文件存放位置-->
<sqlMapGenerator targetPackage="com.jiangjian.mapping" targetProject="src">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.jiangjian.dao"
targetProject="src">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名-->
<table tableName="students" domainObjectName="Student" enableCountByExample="false"
enableUpdateByExample="false" enableDeleteByExample="false"
enableSelectByExample="false" selectByExampleQueryId="false">
</table>
</context>
</generatorConfiguration>
修改generatorConfig.xml中的数据库连接信息、数据库表信息以及生成文件位置后，使用 mvn mybatis-generator:generate命令进行生成。
以上，已完成Springboot+MyBatis+PageHelper+druid以及多数据源的配置。
原文：https://blog.csdn.net/zhengyidi1357/article/details/80851856