Package edu.caltech.nanodb.commands

Class DumpTableCommand

java.lang.Object

edu.caltech.nanodb.commands.Command

edu.caltech.nanodb.commands.DumpCommand

edu.caltech.nanodb.commands.DumpTableCommand

public class DumpTableCommand
extends DumpCommand

This command object represents a DUMP TABLE command issued against the database. DUMP TABLE commands are pretty simple, having a single form: DUMP TABLE ... [TO FILE ...] [FORMAT ...].

This command is effectively identical to SELECT * FROM tbl; with the results being output to console or a data file for analysis. The command is particularly helpful when the planner only implements Planner.makeSimpleSelect(java.lang.String, edu.caltech.nanodb.expressions.Expression, java.util.List<edu.caltech.nanodb.queryast.SelectClause>); no planning is needed for this command to work.

Nested Class Summary

Nested classes/interfaces inherited from class edu.caltech.nanodb.commands.DumpCommand

DumpCommand.TupleExporter

Nested classes/interfaces inherited from class edu.caltech.nanodb.commands.Command

Command.Type

Field Summary

Fields

Modifier and Type	Field	Description
private java.lang.String	tableName	The name of the table to dump.

Fields inherited from class edu.caltech.nanodb.commands.DumpCommand

fileName, format

Fields inherited from class edu.caltech.nanodb.commands.Command

out

Constructor Summary

Constructors

Constructor	Description
DumpTableCommand(java.lang.String tableName, java.lang.String fileName, java.lang.String format)	Constructs a new dump-table command.

Method Summary

Modifier and Type	Method	Description
java.lang.String	getTableName()	Get the name of the table to be dumped.
protected PlanNode	prepareDumpPlan(NanoDBServer server)
java.lang.String	toString()

Methods inherited from class edu.caltech.nanodb.commands.DumpCommand

execute, getFilename, getFormat

Methods inherited from class edu.caltech.nanodb.commands.Command

getCommandType

Methods inherited from class java.lang.Object

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

Field Detail

tableName

private java.lang.String tableName

The name of the table to dump.

Constructor Detail

DumpTableCommand

public DumpTableCommand(java.lang.String tableName,
                        java.lang.String fileName,
                        java.lang.String format)

Constructs a new dump-table command.

Parameters:

tableName - the name of the table to dump

fileName - the path and file to dump the data to. The console will be used if this is @code{null}.

format - the format to dump the data in

Throws:

java.lang.IllegalArgumentException - if tableName is null.

Method Detail

getTableName

public java.lang.String getTableName()

Get the name of the table to be dumped.

Returns:

the name of the table to dump

prepareDumpPlan

protected PlanNode prepareDumpPlan(NanoDBServer server)

Specified by:

prepareDumpPlan in class DumpCommand

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object