将Micronaut + GORM与多个数据源一起使用时，如何配置applicatiuon.yml

分类：编程问答

如何解决将Micronaut + GORM与多个数据源一起使用时，如何配置applicatiuon.yml

环境：Java 11 + Micronaut 2.1 + GORM。

我有两个数据库要连接。 PostgreSQL和MSSQL。我尝试了一些在Internet上查找的方法，但都失败了。以下是我的详细配置，代码和输出日志。请指导我如何正确配置application.yml。谢谢

参考站点：

  1. Grails Multi-datasource
  2. GORM for Hibernate

我的application.yml如下：

micronaut:
  application:
    name: demo
---
hibernate:
  hbm2ddl:
    auto: none
  cache:
    queries: false
    use_second_level_cache: false
    use_query_cache: false
---

dataSource:
  dbCreate: none
  url: jdbc:postgresql://localhost/test_db1
  dialect: org.hibernate.dialect.PostgreSQLDialect
  pooled: true
  jmxExport: true
  driverClassName: org.postgresql.Driver
  username: 'user1'
  password: 'user1'
dataSources:
  emp:
    pooled: true
    jmxExport: true
    dialect: org.hibernate.dialect.SQLServer2012Dialect
    driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver
    dbCreate: none
    url: jdbc:sqlserver://localhost:1433;databaseName=test_db2
    username: 'user2'
    password: 'user2'

我的实体类：

import grails.gorm.annotation.Entity
import org.springframework.context.i18n.LocaleContextHolder

@Entity
class Country {
    String enDisplayName;

    static mapping = {
        version false
    }
    static constraints = {
        enDisplayName   nullable: false
    }
}

@Entity
class Employee {
    String employeeId
    String employeeName
    
    static mapping = {
        dataSource 'emp'
        version false
        id name:'employeeId',generator:'assigned'
    }

}

我的主要代码：

package com.example

import com.example.domain.Country
import com.example.domain.Employee
import io.micronaut.configuration.picocli.PicocliRunner
import io.micronaut.context.ApplicationContext

import picocli.CommandLine
import picocli.CommandLine.Command
import picocli.CommandLine.Option
import picocli.CommandLine.Parameters

@Command(name = 'demo',description = '...',mixinStandardHelpOptions = true)
class DemoCommand implements Runnable {

    @Option(names = ['-v','--verbose'],description = '...')
    boolean verbose

    static void main(String[] args) throws Exception {
        PicocliRunner.run(DemoCommand.class,args)
    }

    void run() {
        // business logic here
        if (verbose) {
            println "Hi!"
        }
        Country.withNewSession {
            List<Country> list = Country.list()
            println("Country count:${list.size()}")

        }
        Employee.withNewSession {
            Employee employee = Employee.findByEmployeeNo('BU4191')
            println("employee name:${employee.employeeName}")
        }

    }
}

日志：

16:25:26.624 [main] INFO  i.m.context.env.DefaultEnvironment - Established active environments: [cli]
16:25:26.928 [main] INFO  i.m.c.h.g.HibernateDatastoreFactory - Starting GORM for Hibernate
16:25:27.558 [main] INFO  org.hibernate.Version - HHH000412: Hibernate ORM core version 5.4.21.Final
16:25:27.682 [main] INFO  o.h.validator.internal.util.Version - HV000001: Hibernate Validator 6.1.5.Final
16:25:27.819 [main] INFO  o.h.annotations.common.Version - HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
16:25:28.646 [main] INFO  org.hibernate.dialect.Dialect - HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
16:25:29.609 [main] INFO  org.hibernate.dialect.Dialect - HHH000400: Using dialect: org.hibernate.dialect.SQLServer2012Dialect
Country count:4
16:25:30.253 [main] WARN  org.hibernate.orm.deprecation - HHH90000022: Hibernate's legacy org.hibernate.Criteria API is deprecated; use the JPA javax.persistence.criteria.CriteriaQuery instead
16:25:30.283 [main] WARN  o.h.e.jdbc.spi.SqlExceptionHelper - SQL Error: 0,SQLState: 42703
16:25:30.283 [main] ERROR o.h.e.jdbc.spi.SqlExceptionHelper - ERROR: column this_.employee_id does not exist
  Position: 8
org.springframework.jdbc.BadSqlGrammarException: Hibernate operation: could not extract ResultSet; bad SQL grammar [n/a]; nested exception is org.postgresql.util.PSQLException: ERROR: column this_.employee_id does not exist
  Position: 8
    at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:101)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
    at org.grails.orm.hibernate.GrailsHibernateTemplate.convertJdbcAccessException(GrailsHibernateTemplate.java:725)
    at org.grails.orm.hibernate.GrailsHibernateTemplate.convertHibernateAccessException(GrailsHibernateTemplate.java:712)
    at org.grails.orm.hibernate.GrailsHibernateTemplate.doExecute(GrailsHibernateTemplate.java:301)
    at org.grails.orm.hibernate.GrailsHibernateTemplate.execute(GrailsHibernateTemplate.java:241)
    at org.grails.orm.hibernate.GrailsHibernateTemplate.executeWithNewSession(GrailsHibernateTemplate.java:153)
    at org.grails.orm.hibernate.AbstractHibernateDatastore.withNewSession(AbstractHibernateDatastore.java:360)
    at org.grails.orm.hibernate.AbstractHibernateGormStaticApi.withNewSession(AbstractHibernateGormStaticApi.groovy:78)
    at org.grails.datastore.gorm.GormEntity$Trait$Helper.withNewSession(GormEntity.groovy:1027)
    at org.grails.datastore.gorm.GormEntity$Trait$Helper$withNewSession.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:148)
    at com.example.domain.Employee.withNewSession(Employee.groovy)
    at com.example.domain.Employee$withNewSession.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:139)
    at com.example.DemoCommand.run(DemoCommand.groovy:34)
    at picocli.CommandLine.executeUserObject(CommandLine.java:1919)
    at picocli.CommandLine.access$1100(CommandLine.java:145)
    at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2332)
    at picocli.CommandLine$RunLast.handle(CommandLine.java:2326)
    at picocli.CommandLine$RunLast.handle(CommandLine.java:2291)
    at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2159)
    at picocli.CommandLine.execute(CommandLine.java:2058)
    at io.micronaut.configuration.picocli.PicocliRunner.run(PicocliRunner.java:137)
    at io.micronaut.configuration.picocli.PicocliRunner.run(PicocliRunner.java:114)
    at io.micronaut.configuration.picocli.PicocliRunner$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:148)
    at com.example.DemoCommand.main(DemoCommand.groovy:21)
Caused by: org.postgresql.util.PSQLException: ERROR: column this_.employee_id does not exist
  Position: 8

解决方法

最终，我尝试了如下成功的结果：

micronaut:
  application:
    name: demo

dataSource:
  url: jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
  driverClassName: org.h2.Driver
  username: sa
  password: ''
  pooled: true
  jmxExport: true
hibernate:
  hbm2ddl:
    auto: update
  cache:
    queries: false
    use_second_level_cache: false
    use_query_cache: false

dataSources:
  seconddb:
    url: jdbc:h2:mem:devDb2;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE
    driverClassName: org.h2.Driver
    username: sa
    password: ''
    readOnly: true
    pooled: true
    jmxExport: true
    hibernate:
      hbm2ddl:
        auto: update
      cache:
        queries: false
        use_second_level_cache: false
        use_query_cache: false

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