【OpenGauss】后端部署使用OpenGauss高斯数据库

Gauss数据库配置

适配版本

4.7.8.3之后的版本

配置步骤

Maven配置

去华为官网下周驱动包:gsjdbc4.jar;
https://support.huaweicloud.com/mgtg-dws/dws_01_0032.html

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>gsjdbc</artifactId>
    <version>4</version>
    <scope>system</scope>
    <!-- 下面两种方式都可以-->
    <systemPath>${pom.basedir}/libs/gsjdbc4.jar</systemPath>
    <!--<systemPath>/Users/wangxian/java-tools/guassdb/gsjdbc4.jar</systemPath>-->
</dependency>

导入 scope 为 system 的包,spring 编译插件需要增加 includeSystemScope: true 配置。

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <includeSystemScope>true</includeSystemScope>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
        </execution>
    </executions>
</plugin>

JDBC连接配置

pamirs:
  datasource:
    pamirs:
      type: com.alibaba.druid.pool.DruidDataSource
      driverClassName: org.postgresql.Driver
      url: jdbc:postgresql://127.0.0.1:5432/pamirs?currentSchema=demo
      username: XXXXXX
      password: XXXXXX
      initialSize: 5
      maxActive: 200
      minIdle: 5
      maxWait: 60000
      timeBetweenEvictionRunsMillis: 60000
      testWhileIdle: true
      testOnBorrow: false
      testOnReturn: false
      poolPreparedStatements: true
      asyncInit: true
    base:
      type: com.alibaba.druid.pool.DruidDataSource
      driverClassName: org.postgresql.Driver
      url: jdbc:postgresql://127.0.0.1:5432/pamirs?currentSchema=demo_base
      username: XXXXXX
      password: XXXXXX
      initialSize: 5
      maxActive: 200
      minIdle: 5
      maxWait: 60000
      timeBetweenEvictionRunsMillis: 60000
      testWhileIdle: true
      testOnBorrow: false
      testOnReturn: false
      poolPreparedStatements: true
      asyncInit: true

连接url配置

点击查看官方文档:官方文档

url格式
jdbc:postgresql://${host}:${port}/${database}?currentSchema=${schema}

在pamirs连接配置时,${database}和${schema}必须完整配置,不可缺省。

其他连接参数如需配置,可自行查阅相关资料进行调优。

方言配置

pamirs方言配置
pamirs:
  dialect:
    ds:
      base:
        type: GaussDB
        version: 5
        majorVersion: 5.0.1
      pamirs:
        type: GaussDB
        version: 5
        majorVersion: 5.0.1
数据库版本 type version majorVersion
5.x GaussDB 5 5.0.1

PS:由于方言开发环境为5.0.1版本,其他类似版本(5.x)原则上不会出现太大差异,如出现其他版本无法正常支持的,可在文档下方留言。

schedule方言配置
pamirs:
  event:
    enabled: true
    schedule:
      enabled: true
      dialect:
        type: GaussDB
        version: 5
        major-version: 5.0.1
type version majorVersion
GaussDB 5 5.0.1

PS:由于schedule的方言在多个版本中并无明显差异,目前仅提供一种方言配置。

其他配置

逻辑删除的值配置
pamirs:
  mapper:
    global:
      table-info:
        logic-delete-value: (EXTRACT(epoch FROM CURRENT_TIMESTAMP) * 1000000 + EXTRACT(MICROSECONDS FROM CURRENT_TIMESTAMP))::bigint

Gauss数据库用户初始化及授权

-- init root user (user name can be modified by oneself)
-- 创建用户root
CREATE USER wangxian PASSWORD 'wx@123456';
-- if using automatic database and schema creation, this is very important.
-- 给用户root指定系统权限CREATEDB
ALTER USER wangxian CREATEDB;

SELECT * FROM pg_roles;
-- if using gauss database, this authorization is required.
GRANT CREATE ON DATABASE pamirs TO root;

从mysql迁移数据到Gauss数据库的注意事项

由于mysql自增id的配置在建表语句,但是Gauss是独立一张序列表记录自增id的,所以同步完数据后需要对自增id部分的数据独立迁移

目前平台内置模块内用自增id的模型有:

  • base模块的LeafAlloc
  • base模块的WorkerNode
  • trigger模块的PamirsSchedule
  • eip模块的EipLog
  • designerCommon模块的ModelMetaChangeRecord

迁移sql示范,其中的库名请根据实际情况修改,没有依赖的模块也无需执行对应sql,业务模型如需迁移也可参考该sql

SELECT setval('demo_base.leaf_alloc_id_seq', (select id from demo_base.leaf_alloc order by id desc limit 1), true);

SELECT setval('demo_base.base_worker_node_id_seq', (select id from demo_base.base_worker_node order by id desc limit 1), true);

SELECT setval('demo_pamirs.pamirs_schedule_0_id_seq', (select id from demo_pamirs.pamirs_schedule_0 order by id desc limit 1), true);

SELECT setval('demo_pamirs.eip_eip_log_id_seq', (select id from demo_pamirs.eip_eip_log order by id desc limit 1), true);

SELECT setval('demo_pamirs.common_model_meta_change_record_id_seq', (select id from demo_pamirs.common_model_meta_change_record order by id desc limit 1), true);

Gauss如何手动设置自增序列的值

使用setval函数

setval函数可以直接设置序列的当前值。它适用于需要精确控制序列值的情况。

  • setval的第一个参数是序列的名称。
  • 第二个参数是要设置的值(例如10)。
  • 第三个参数表示是否将is_called标志设置为true,即下次调用nextval时返回设置的值。

示例操作

假设你的序列全名是demo_pamirs.pamirs_schedule_0_id_seq,其中demo_pamirs为库名,以下是具体操作步骤:

  1. 重置序列的当前值
    # 设置序列为10
    SELECT setval('demo_pamirs.pamirs_schedule_0_id_seq', 10, true);
  2. 验证序列的新值:
    # last_value字段的值为10
    SELECT * FROM demo_pamirs.pamirs_schedule_0_id_seq;

本文来自投稿,不代表Oinone社区立场,如若转载,请注明出处:https://doc.oinone.top/backend/6424.html

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