养成良好的记录习惯
作者：黄黄
最近公司业务要求查询不同数据库的数据组装在一起，所以需要进行多数据源配置的操作。
yml添加配置
- 这里以sqlsever数据库为例，其他数据库也类似
- 这里列举first和second两个数据源
datasource:
first:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
jdbc-url: jdbc:sqlserver://192.168.0.001:61592;databaseName=master
username: xxxxxxx
password: xxxxxxx
druid:
#连接池初始化大小
initial-size: 5
#连接池最小值
min-idle: 5
#连接池最大值
max-active: 20
#最大等待时间，配置获取连接等待超时，时间单位都是毫秒ms
max-wait: 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
time-between-eviction-runs-millis: 60000
#配置一个连接在池中最小生存的时间
min-evictable-idle-time-millis: 300000
second:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
jdbc-url: jdbc:sqlserver://192.168.0.002:61592;databaseName=master
username: xxxxxx
password: xxxxxxxxxxx
druid:
#连接池初始化大小
initial-size: 5
#连接池最小值
min-idle: 5
#连接池最大值
max-active: 20
#最大等待时间，配置获取连接等待超时，时间单位都是毫秒ms
max-wait: 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
time-between-eviction-runs-millis: 60000
#配置一个连接在池中最小生存的时间
min-evictable-idle-time-millis: 300000
这里列举几个小细节
- driver-class-name不能使用驼峰
- 一定得使用 jdbc-url，不能使用url
添加数据源配置
mybatis对应的配置
first配置
@Configuration
@MapperScan(basePackages = {"com.self.structure.first.dao"}, sqlSessionTemplateRef = "firstSqlSessionTemplate")
public class FirstDruidConfig {
@Bean(name = "firstDataSource")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.first")
public DataSource firstDataSource() {
return DataSourceBuilder.create().build();
}
@Bean
public SqlSessionFactory firstSqlSessionFactory(@Qualifier("firstDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean sqlSessionFactory= new SqlSessionFactoryBean();
sqlSessionFactory.setDataSource(dataSource);
//添加XML目录
sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/first/*-mapper.xml"));
return sqlSessionFactory.getObject();
}
@Bean
public SqlSessionTemplate firstSqlSessionTemplate(@Qualifier("firstSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
// 使用上面配置的Factory
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory);
return template;
}
}
second配置
@Configuration
@MapperScan(basePackages = {"com.self.structure.second.dao"}, sqlSessionTemplateRef = "secondSqlSessionTemplate")
public class SecondDruidConfig {
@Bean(name = "secondDataSource")
@ConfigurationProperties(prefix = "spring.datasource.second")
public DataSource secondDataSource() {
return DataSourceBuilder.create().build();
}
@Bean
public SqlSessionFactory secondSqlSessionFactory(@Qualifier("secondDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean sqlSessionFactory= new SqlSessionFactoryBean();
sqlSessionFactory.setDataSource(dataSource);
//添加XML目录
sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/second/*-mapper.xml"));
return sqlSessionFactory.getObject();
}
@Bean
public SqlSessionTemplate secondSqlSessionTemplate(@Qualifier("secondSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
// 使用上面配置的Factory
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory);
return template;
}
}
注：first配置中@Primary注解作用是指定项目默认数据源，也就是项目启动默认连接的数据源
mybatis-plus对应的配置
- 相比mybatis的配置要多配置MybatisConfiguration和plugins
first配置
@Configuration
@MapperScan(basePackages = {"com.self.structure.first.dao"}, sqlSessionTemplateRef = "firstSqlSessionTemplate")
public class FirstDruidConfig {
@Bean(name = "firstDataSource")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.first")
public DataSource firstDataSource() {
return DataSourceBuilder.create().build();
}
@Bean
public SqlSessionFactory firstSqlSessionFactory(@Qualifier("firstDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean sqlSessionFactory= new SqlSessionFactoryBean();
sqlSessionFactory.setDataSource(dataSource);
//添加XML目录
sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/first/*-mapper.xml"));
//mybatis-plus的额外配置
MybatisConfiguration configuration = new MybatisConfiguration();
configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
configuration.setJdbcTypeForNull(JdbcType.NULL);
sqlSessionFactory.setConfiguration(configuration);
sqlSessionFactory.setPlugins(new Interceptor[]{
new PaginationInterceptor(),
new PerformanceInterceptor(),
new OptimisticLockerInterceptor()
});
return sqlSessionFactory.getObject();
}
@Bean
public SqlSessionTemplate firstSqlSessionTemplate(@Qualifier("firstSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
// 使用上面配置的Factory
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory);
return template;
}
}
second配置
@Configuration
@MapperScan(basePackages = {"com.self.structure.second.dao"}, sqlSessionTemplateRef = "secondSqlSessionTemplate")
public class SecondDruidConfig {
@Bean(name = "secondDataSource")
@ConfigurationProperties(prefix = "spring.datasource.second")
public DataSource secondDataSource() {
return DataSourceBuilder.create().build();
}
@Bean
public SqlSessionFactory secondSqlSessionFactory(@Qualifier("secondDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean sqlSessionFactory= new SqlSessionFactoryBean();
sqlSessionFactory.setDataSource(dataSource);
//添加XML目录
sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/second/*-mapper.xml"));
//mybatis-plus的额外配置
MybatisConfiguration configuration = new MybatisConfiguration();
configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
configuration.setJdbcTypeForNull(JdbcType.NULL);
sqlSessionFactory.setConfiguration(configuration);
sqlSessionFactory.setPlugins(new Interceptor[]{
new PaginationInterceptor(),
new PerformanceInterceptor(),
new OptimisticLockerInterceptor()
});
return sqlSessionFactory.getObject();
}
@Bean
public SqlSessionTemplate secondSqlSessionTemplate(@Qualifier("secondSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
// 使用上面配置的Factory
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory);
return template;
}
}
创建Mapper
- 接下来就是和往常一样创建数据源配置中注解@MapperScan(basePackages = {"com.self.structure.first/second.dao"})对应的mybatis/mybatis-plus数据访问层了