我知道我们可以通过以下命令从 SparkSQL 查询或创建 Mysql 表。
val data = sqlContext.read.jdbc(urlstring, tablename, properties)
data.write.format("com.databricks.spark.csv").save(result_location)
val dataframe = sqlContext.read.json("users.json")
dataframe.write.jdbc(urlstring, table, properties)
像这样有什么办法可以删除桌子吗?
你可以尝试一下基本的DROP
操作与JDBC
司机 :
val DB_URL: String = ???
val USER: String = ???
val PASS: String = ???
def dropTable(tableName: String) = {
import java.sql._;
var conn: Connection = null;
var stmt: Statement = null;
try {
Class.forName("com.mysql.jdbc.Driver");
println("Connecting to a selected database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
println("Connected database successfully...");
println("Deleting table in given database...");
stmt = conn.createStatement();
val sql: String = s"DROP TABLE ${tableName} ";
stmt.executeUpdate(sql);
println(s"Table ${tableName} deleted in given database...");
} catch {
case e: Exception => println("exception caught: " + e);
} finally {
???
}
}
dropTable("test")
您可以使用 Spark 来做到这一点JDBCUtils
但这非常简单。
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