Class Export

java.lang.Object

org.apache.derby.impl.load.ExportAbstract

org.apache.derby.impl.load.Export

public class Export
extends ExportAbstract

This class provides ways to export data from a table or a view into a file. Export functions provided in this class are called through Systement Procedures.

Field Summary

Fields

Modifier and Type	Field	Description
private String	lobsFileName
private String	outputFileName

Fields inherited from class ExportAbstract

con, controlFileReader, entityName, exportResultSetForObject, exportWriteData, lobsInExtFile, schemaName, selectStatement

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Export(Connection con, String schemaName, String tableName, String selectStatement, String outputFileName, String characterDelimeter, String columnDelimeter, String codeset)

Method Summary

Modifier and Type	Method	Description
private boolean	dataFileExists(String fileName)	Checks whether the data file exists .
private void	doExport()
static void	exportQuery(Connection con, String selectStatement, String outputFileName, String columnDelimeter, String characterDelimeter, String codeset)	SYSCS_EXPORT_QUERY system Procedure from ij or from a Java application invokes this method to perform export of the data retrieved by select statement to a file.
static void	exportQuery(Connection con, String selectStatement, String outputFileName, String columnDelimeter, String characterDelimeter, String codeset, String lobsFileName)	SYSCS_EXPORT_QUERY_LOBS_TO_EXTFILE system Procedure from ij or from a Java application invokes this method to perform export of the data retrieved by select statement to a file.
static void	exportTable(Connection con, String schemaName, String tableName, String outputFileName, String columnDelimeter, String characterDelimeter, String codeset)	SYSCS_EXPORT_TABLE system Procedure from ij or from a Java application invokes this method to perform export of a table data to a file.
static void	exportTable(Connection con, String schemaName, String tableName, String outputFileName, String columnDelimeter, String characterDelimeter, String codeset, String lobsFileName)	SYSCS_EXPORT_TABLE_LOBS_TO_EXTFILE system procedure from ij or from a Java application invokes this method to perform export of a table data to a file.
private final boolean	fileExists(File file)	Checks if the specified file exists.
protected ExportWriteDataAbstract	getExportWriteData()	For internal use only
private boolean	lobsFileExists(String fileName)	Checks whether the lobs file exists .
private void	setLobsExtFileName(String lobsFileName)	Set the file name to which larg object data has to be exported, and also set flag to indicate that large objects are exported to a different file.

Methods inherited from class ExportAbstract

doAllTheWork, getControlFileReader, resultSetForEntity, stringifyObject

Methods inherited from class Object

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

Field Details

outputFileName

private String outputFileName

lobsFileName

private String lobsFileName

Constructor Details

Export

private Export(Connection con,
 String schemaName,
 String tableName,
 String selectStatement,
 String outputFileName,
 String characterDelimeter,
 String columnDelimeter,
 String codeset)
        throws SQLException

Throws:

SQLException

Method Details

doExport

private void doExport()
               throws SQLException

Throws:

SQLException

setLobsExtFileName

private void setLobsExtFileName(String lobsFileName)
                         throws SQLException

Set the file name to which larg object data has to be exported, and also set flag to indicate that large objects are exported to a different file.

Parameters:

lobsFileName - the file to to which lob data has to be exported.

Throws:

SQLException - if file name is null.

lobsFileExists

private boolean lobsFileExists(String fileName)
                        throws SQLException

Checks whether the lobs file exists .

Parameters:

fileName - the file to to which lob data has to be exported.

Throws:

SQLException - if file name is null.

dataFileExists

private boolean dataFileExists(String fileName)
                        throws SQLException

Checks whether the data file exists .

Parameters:

fileName - the file to to which lob data has to be exported.

Throws:

SQLException - if file name is null.

fileExists

private final boolean fileExists(File file)

Checks if the specified file exists.

Parameters:

file - the file to check

Returns:

true if the file exists, false if not.

Throws:

SecurityException - if the required privileges are missing

exportTable

public static void exportTable(Connection con,
 String schemaName,
 String tableName,
 String outputFileName,
 String columnDelimeter,
 String characterDelimeter,
 String codeset)
                        throws SQLException

SYSCS_EXPORT_TABLE system Procedure from ij or from a Java application invokes this method to perform export of a table data to a file.

Parameters:

con - The Derby database connection URL for the database containing the table

schemaName - schema name of the table data is being exported from

tableName - Name of the Table from which data has to be exported.

outputFileName - Name of the file to which data has to be exported.

columnDelimeter - Delimiter that seperates columns in the output file

characterDelimeter - Delimiter that is used to quoate non-numeric types

codeset - Codeset that should be used to write the data to the file

Throws:

SQLException - on errors

exportTable

public static void exportTable(Connection con,
 String schemaName,
 String tableName,
 String outputFileName,
 String columnDelimeter,
 String characterDelimeter,
 String codeset,
 String lobsFileName)
                        throws SQLException

SYSCS_EXPORT_TABLE_LOBS_TO_EXTFILE system procedure from ij or from a Java application invokes this method to perform export of a table data to a file. Large object data is exported to a different file and the reference to it is stored in the main output file.

Parameters:

con - The Derby database connection URL for the database containing the table

schemaName - schema name of the table data is being exported from

tableName - Name of the Table from which data has to be exported.

outputFileName - Name of the file to which data has to be exported.

columnDelimeter - Delimiter that seperates columns in the output file.

characterDelimeter - Delimiter that is used to quote non-numeric types.

codeset - Codeset that should be used to write the data to the file/

lobsFileName - Name of the file to which large object data has to be exported.

Throws:

SQLException - on errors

exportQuery

public static void exportQuery(Connection con,
 String selectStatement,
 String outputFileName,
 String columnDelimeter,
 String characterDelimeter,
 String codeset)
                        throws SQLException

SYSCS_EXPORT_QUERY system Procedure from ij or from a Java application invokes this method to perform export of the data retrieved by select statement to a file.

Parameters:

con - The Derby database connection URL for the database containing the table

selectStatement - select query that is used to export the data

outputFileName - Name of the file to which data has to be exported.

columnDelimeter - Delimiter that seperates columns in the output file

characterDelimeter - Delimiter that is used to quiote non-numeric types

codeset - Codeset that should be used to write the data to the file

Throws:

SQLException - on errors

exportQuery

public static void exportQuery(Connection con,
 String selectStatement,
 String outputFileName,
 String columnDelimeter,
 String characterDelimeter,
 String codeset,
 String lobsFileName)
                        throws SQLException

SYSCS_EXPORT_QUERY_LOBS_TO_EXTFILE system Procedure from ij or from a Java application invokes this method to perform export of the data retrieved by select statement to a file. Large object data is exported to a different file and the reference to it is stored in the main output file.

Parameters:

con - The Derby database connection URL for the database containing the table

selectStatement - select query that is used to export the data

outputFileName - Name of the file to which data has to be exported.

columnDelimeter - Delimiter that seperates columns in the output file

characterDelimeter - Delimiter that is used to quote non-numeric types

codeset - Codeset that should be used to write the data to the file

lobsFileName - Name of the file to which large object data has to be exported.

Throws:

SQLException - on errors

getExportWriteData

protected ExportWriteDataAbstract getExportWriteData()
                                              throws Exception

For internal use only

Specified by:

getExportWriteData in class ExportAbstract

Throws:

Exception - if there is an error