JDBC Driver for HDFS

Build 21.0.7930

Result Sets

You can use ResultSetMetaData to retrieve metadata about the results of a query.

The query can contain any of the following:

  • Joins
  • Aggregates
  • Aliases
  • Fully qualified names
  • Generated columns

You can instantiate a ResultSetMetaData object by invoking the getMetaData method of the Statement class. A ResultSetMetaData instance is populated with data after the statement has been executed. The following query prints out the columns in the result of the query:

String connectionString = "jdbc:hdfs:Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;";

Connection conn = DriverManager.getConnection(connectionString);
PreparedStatement pstmt = conn.prepareStatement("SELECT FileId, ChildrenNum AS My_ChildrenNum, GETDATE() FROM Files WHERE FileId = '119116'");
pstmt.executeQuery();
ResultSetMetaData rs = pstmt.getMetaData();
for(int i=1;i<=rs.getColumnCount();i++) {
  System.out.println(rs.getColumnName(i));
}

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Build 21.0.7930