Druid连接池更换Guess数据源

• 1. 遇到的问题
• 2. 更换数据源操作步骤
  • 1.添加pom依赖
  • 2.更改jdbc.properties
  • 3.初始化Druid连接池

1. 遇到的问题

工作中有个db国产化的需求，需要在一个老项目中把DB从mysql更换为openGuess，将对应的驱动和Druid数据源改造后启动程序报错如下：

java.lang.IllegalStateException: dbType not support : nul, url jdbc:opengauss://127.0.0.1:15400/testdb1?autoBalance=roundrobin&targetServerType=master&loggerLevel=off
	at com.alibaba.druid.wall.WallFilter.init(WallFilter.java:167)
	at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:827)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	...

排查后发现：com.alibaba.druid.util.JdbcConstants中没有openGuess的类型

解决办法：使用 openGuess底层的PostgreSQL类型，下面有详细的操作步骤

2. 更换数据源操作步骤

1.添加pom依赖

<dependency>
    <groupId>org.opengauss</groupId>
    <artifactId>opengauss-jdbc</artifactId>
    <version>5.0.0-og</version>
</dependency>

<!--druid-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.16</version>
</dependency>

2.更改jdbc.properties

druid.driverClassName = org.opengauss.Driver
druid.url = jdbc:opengauss://127.0.0.1:15400/testdb1?autoBalance=roundrobin&targetServerType=master&loggerLevel=off
druid.username = lihw
druid.password = 123456
druid.initialSize = 1
druid.minIdle = 1
druid.maxActive = 3
druid.maxWait =  900
druid.timeBetweenEvictionRunsMillis = 2000
druid.minEvictableIdleTimeMillis = 30000
druid.validationQuery = select 1
druid.testWhileIdle = true
druid.testOnBorrow = false
druid.testOnReturn = false
druid.poolPreparedStatements = false
druid.maxPoolPreparedStatementPerConnectionSize = 20
#druid.filters = stat,wall,slf4j
hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
hibernate.show_sql=false

注意：驱动和方言的变化

• 数据库驱动：org.opengauss.Driver
• 方言：org.hibernate.dialect.PostgreSQLDialect

3.初始化Druid连接池

    <bean id="wall-filter" class="com.alibaba.druid.wall.WallFilter">
        <property name="dbType" value="postgresql"/>
    </bean>

    <bean id="stat-filter" class="com.alibaba.druid.filter.stat.StatFilter">
    </bean>

    <bean id="slf4j-filter" class="com.alibaba.druid.filter.logging.Slf4jLogFilter">
    </bean>

    <!--druid  openGuess-->
    <bean id="dataSourceTarget" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <!-- 基本属性 url、user、password ，driverClassName-->
        <property name="driverClassName" value="${druid.driverClassName}"/>
        <property name="url" value="${druid.url}" />
        <property name="username" value="${druid.username}" />
        <property name="password" value="${druid.password}" />
        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="${druid.initialSize}" />
        <property name="minIdle" value="${druid.minIdle}"/>
        <property name="maxActive" value="${druid.maxActive}" />
        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="${druid.maxWait}" />
        <!-- 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 -->
        <property name="timeBetweenEvictionRunsMillis" value="${druid.timeBetweenEvictionRunsMillis}" />
        <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="${druid.minEvictableIdleTimeMillis}" />
        <property name="validationQuery" value="${druid.validationQuery}" />
        <property name="testWhileIdle" value="${druid.testWhileIdle}" />
        <property name="testOnBorrow" value="${druid.testOnBorrow}" />
        <property name="testOnReturn" value="${druid.testOnReturn}" />
        <!-- 打开PSCache,并且指定每个连接上PSCache的大小 -->
        <!-- 如果用Oracle,则把poolPreparedStatements配置为true,
        mysql可以配置为false。分库分表较多的数据库,建议配置为false。 -->
        <property name="poolPreparedStatements" value="${druid.poolPreparedStatements}" />
        <property name="maxPoolPreparedStatementPerConnectionSize" value="${druid.maxPoolPreparedStatementPerConnectionSize}" />
        <!-- 配置监控统计拦截的filters,去掉后监控界面sql无法统计 -->
<!--        <property name="filters" value="${druid.filters}" />-->
        <property name="proxyFilters">
            <list> 
                <ref bean="wall-filter"/>
                <ref bean="stat-filter"/>
                <ref bean="slf4j-filter"/>
            </list>
        </property>
    </bean>

注意：

druid-1.1.16版本未兼容高斯的DB，使用proxyFilters过滤器，类型设置为postgresql

<bean id="wall-filter" class="com.alibaba.druid.wall.WallFilter">
    <property name="dbType" value="postgresql"/>
</bean>