spark將資料載入到postgresql中：
方法一：

def save2Postgresql(jdbcDf: DataFrame, url: String, tableName: String) = {
    jdbcDf.insertIntoJDBC(url, tableName, false)
  }

方法二：

def save2Postgresql(jdbcDf: DataFrame): Unit = {
    val url = "jdbc:postgresql://ip:5433/databaseName"
    val prop = new Properties()
    prop.setProperty("driver"
 
, "org.postgresql.Driver")
    prop.setProperty("user", "userName")
    prop.setProperty("password", "password")
    jdbcDf.write.mode(SaveMode.Append).jdbc(url, "table", prop)

  }

依賴的jar包：

<!-- https://mvnrepository.com/artifact/org.postgresql/postgresql -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.2</version>
</dependency>