JDOQLQueryHelper (DataNucleus Core 6.0.1-SNAPSHOT API)

java.lang.Object
- org.datanucleus.store.query.JDOQLQueryHelper

```
public class JDOQLQueryHelper
extends Object
```
JDOQL query helper class providing key information about the language etc.

Constructor Summary

Constructors
Constructor Description

JDOQLQueryHelper()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static String`	`getCandidateFromJDOQLString(String query)`	Convenience method to extract the FROM candidate from a JDOQL query string.
`static String`	`getJDOQLForExpression(Expression expr)`
`static boolean`	`isKeyword(String name)`	Convenience method returning if the supplied name is a keyword for this query language.
`static boolean`	`isKeywordExtended(String name)`	Convenience method returning if the supplied name is a keyword for this query language, allowing the DataNucleus extension keywords (UPDATE, DELETE, SET).
`static boolean`	`isValidJavaIdentifierForJDOQL(String s)`	Utility to check if a name is a valid Java identifier.

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

- Constructor Detail
  - JDOQLQueryHelper
```
public JDOQLQueryHelper()
```
- Method Detail
  - isKeyword
```
public static boolean isKeyword(String name)
```
    Convenience method returning if the supplied name is a keyword for this query language.
    
    Parameters:
    
    name - Name to check
    
    Returns:
    
    Whether it is a keyword
  - isKeywordExtended
```
public static boolean isKeywordExtended(String name)
```
    Convenience method returning if the supplied name is a keyword for this query language, allowing the DataNucleus extension keywords (UPDATE, DELETE, SET).
    
    Parameters:
    
    name - Name to check
    
    Returns:
    
    Whether it is a keyword
  - isValidJavaIdentifierForJDOQL
```
public static boolean isValidJavaIdentifierForJDOQL(String s)
```
    Utility to check if a name is a valid Java identifier. Used by JDOQL in validating the names of parameters/variables.
    
    Parameters:
    
    s - The name
    
    Returns:
    
    Whether it is a valid identifier in Java.
  - getCandidateFromJDOQLString
```
public static String getCandidateFromJDOQLString(String query)
```
    Convenience method to extract the FROM candidate from a JDOQL query string.
    
    Parameters:
    
    query - The query string
    
    Returns:
    
    The from candidate
  - getJDOQLForExpression
```
public static String getJDOQLForExpression(Expression expr)
```