使用 SparkSQL 删除 MySQL 表
我知道我们可以通过以下命令从 SparkSQL 查询或创建一个 Mysql 表.
I know that we can query or create a Mysql table from SparkSQL through the below commands.
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)
这样有没有办法删除一个表?
Like that is there any way to drop a table ?
推荐答案
您可以尝试使用 JDBC 驱动程序进行基本的 DROP 操作:
You can try a basic DROP operation with the JDBC driver :
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 JDBCUtils 在 Spark 中做到这一点，但这非常简单.
You can do that with Spark using JDBCUtils but this is quite straightforward.
相关文章