simpledb.parse
Class ModifyData

java.lang.Object
  simpledb.parse.ModifyData

public class ModifyData
extends java.lang.Object

Data for the SQL update statement.

Author:

Edward Sciore

Constructor Summary

ModifyData(java.lang.String tblname, java.lang.String fldname, Expression newval, Predicate pred)
Saves the table name, the modified field and its new value, and the predicate.

Method Summary

Expression	newValue() Returns an expression.
Predicate	pred() Returns the predicate that describes which records should be modified.
java.lang.String	tableName() Returns the name of the affected table.
java.lang.String	targetField() Returns the field whose values will be modified

Methods inherited from class java.lang.Object

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

Constructor Detail

ModifyData

public ModifyData(java.lang.String tblname,
                  java.lang.String fldname,
                  Expression newval,
                  Predicate pred)

Saves the table name, the modified field and its new value, and the predicate.

Method Detail

tableName

public java.lang.String tableName()

Returns the name of the affected table.

Returns:

the name of the affected table

targetField

public java.lang.String targetField()

Returns the field whose values will be modified

Returns:

the name of the target field

newValue

public Expression newValue()

Returns an expression. Evaluating this expression for a record produces the value that will be stored in the record's target field.

Returns:

the target expression

pred

public Predicate pred()

Returns the predicate that describes which records should be modified.

Returns:

the modification predicate