UpdateValue (NanoDB SQL Relational Database 0.1-SNAPSHOT API)

java.lang.Object
- edu.caltech.nanodb.commands.UpdateValue

```
public class UpdateValue
extends java.lang.Object
```
This class represents a single column-name/expression pair in an UPDATE statement's SET clause.

Field Summary

Fields
Modifier and Type	Field	Description
`private java.lang.String`	`columnName`	The column that will receive the value when the update is applied to a tuple.
`private Expression`	`expression`	The expression that will be computed and stored.

Constructor Summary

Constructors
Constructor Description

UpdateValue(java.lang.String colName, Expression e)
Construct an update-value object from a column name and an expression.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`getColumnName()`
`Expression`	`getExpression()`	Returns the expression for generating the update-value.
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - columnName
```
private java.lang.String columnName
```
    The column that will receive the value when the update is applied to a tuple.
  - expression
```
private Expression expression
```
    The expression that will be computed and stored.
- Constructor Detail
  - UpdateValue
```
public UpdateValue(java.lang.String colName,
                   Expression e)
```
    Construct an update-value object from a column name and an expression.
    
    Parameters:
    
    colName - The column name that will receive the value.
    
    e - The expression that generates the value to store.
    
    Throws:
    
    java.lang.NullPointerException - if colName or e is null
- Method Detail
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - getColumnName
```
public java.lang.String getColumnName()
```
  - getExpression
```
public Expression getExpression()
```
    Returns the expression for generating the update-value.