CompareExpression (OpenJPA Parent POM 2.4.0 API)

java.lang.Object
- org.apache.openjpa.jdbc.kernel.exps.CompareExpression

All Implemented Interfaces:

Serializable, Exp, Expression
```
 class CompareExpression
extends Object
implements Exp
```
Compares two values.

Author:

Abe White

Field Summary

Fields
Modifier and Type Field and Description

static String GREATER

static String GREATER_EQUAL

static String LESS

static String LESS_EQUAL

Fields
Modifier and Type	Field and Description
`static String`	`GREATER`
`static String`	`GREATER_EQUAL`
`static String`	`LESS`
`static String`	`LESS_EQUAL`

Constructor Summary

Constructors
Constructor and Description

CompareExpression(Val val1, Val val2, String op)
Constructor.

Constructors
Constructor and Description
`CompareExpression(Val val1, Val val2, String op)` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`acceptVisit(ExpressionVisitor visitor)` Accept a visit from a tree visitor.
`void`	`appendTo(Select sel, ExpContext ctx, ExpState state, SQLBuffer buf)` Append the SQL for this expression to the given buffer.
`ExpState`	`initialize(Select sel, ExpContext ctx, Map contains)` Initialize the expression.
`void`	`selectColumns(Select sel, ExpContext ctx, ExpState state, boolean pks)` Select just the columns for this expression.

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

- Field Detail
  - LESS
```
public static final String LESS
```
    See Also:
    Constant Field Values
  - GREATER
```
public static final String GREATER
```
    See Also:
    Constant Field Values
  - LESS_EQUAL
```
public static final String LESS_EQUAL
```
    See Also:
    Constant Field Values
  - GREATER_EQUAL
```
public static final String GREATER_EQUAL
```
    See Also:
    Constant Field Values
- Constructor Detail
  - CompareExpression
```
public CompareExpression(Val val1,
                 Val val2,
                 String op)
```
    Constructor. Supply values and operator.
- Method Detail
  - initialize
```
public ExpState initialize(Select sel,
                  ExpContext ctx,
                  Map contains)
```
    Description copied from interface: Exp
    
    Initialize the expression. This method should recursively initialize any sub-expressions or values.
    
    Specified by:
    
    initialize in interface Exp
    
    contains - map of relation paths to the number of times the paths appear in a contains() expression; used to ensure paths used for contains() within the same AND expression used different aliases
  - appendTo
```
public void appendTo(Select sel,
            ExpContext ctx,
            ExpState state,
            SQLBuffer buf)
```
    Description copied from interface: Exp
    
    Append the SQL for this expression to the given buffer. The SQL should optionally include any joins this expression needs.
    
    Specified by:
    
    appendTo in interface Exp
  - selectColumns
```
public void selectColumns(Select sel,
                 ExpContext ctx,
                 ExpState state,
                 boolean pks)
```
    Description copied from interface: Exp
    
    Select just the columns for this expression.
    
    Specified by:
    
    selectColumns in interface Exp
  - acceptVisit
```
public void acceptVisit(ExpressionVisitor visitor)
```
    Description copied from interface: Expression
    
    Accept a visit from a tree visitor.
    
    Specified by:
    
    acceptVisit in interface Expression

Class CompareExpression

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LESS

GREATER

LESS_EQUAL

GREATER_EQUAL

Constructor Detail

CompareExpression

Method Detail

initialize

appendTo

selectColumns

acceptVisit