Package com.exasol.adapter.jdbc

Class ResultSetMetadataReader

java.lang.Object

com.exasol.adapter.jdbc.ResultSetMetadataReader

public class ResultSetMetadataReader
extends Object

This class creates a textual description of the result columns of a push-down query.

The columns description is necessary to prepare the IMPORT statement in which the push-down query is executed.

Constructor Summary

Constructors

Constructor	Description
ResultSetMetadataReader(Connection connection, ColumnMetadataReader columnMetadataReader)	Create a new instance of a ResultSetMetadataReader.

Method Summary

Modifier and Type	Method	Description
String	describeColumns(String query)	Generate a textual description of the result columns of the push-down query.
protected static JDBCTypeDescription	getJdbcTypeDescription(ResultSetMetaData metadata, int columnNumber)	Get the jdbc type description from result set metadata.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ResultSetMetadataReader

public ResultSetMetadataReader(Connection connection,
                               ColumnMetadataReader columnMetadataReader)

Create a new instance of a ResultSetMetadataReader.

Parameters:

connection - connection to the remote data source

columnMetadataReader - column metadata reader used to translate the column types

Method Detail

describeColumns

public String describeColumns(String query)

Generate a textual description of the result columns of the push-down query.

Parameters:

query - push-down query

Returns:

string describing the columns (names and types)

getJdbcTypeDescription

protected static JDBCTypeDescription getJdbcTypeDescription(ResultSetMetaData metadata,
                                                            int columnNumber)
                                                     throws SQLException

Get the jdbc type description from result set metadata.

Parameters:

metadata - result set metadata

columnNumber - column number to read

Returns:

JDBC type description

Throws:

SQLException - if reading fails