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两种单例模式,以oracle连接为例

urlformat1: 枚举类型

Dataset dataset = spark.read().format("jdbc").options(UrlFormat1.urlFormat.oracle_()).load();

urlformat2: 饿汉式类型

Dataset dataset = spark.read().format("jdbc").options(UrlFormat2.getUrl().oracle_()).load();

项目里用的是第二种类型

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Spark-jdbc-io of four DMS

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