UnboundExpression (DataNucleus RDBMS plugin 6.0.1-SNAPSHOT API)

java.lang.Object
- org.datanucleus.store.rdbms.sql.expression.SQLExpression
- - org.datanucleus.store.rdbms.sql.expression.UnboundExpression

```
public class UnboundExpression
extends SQLExpression
```
Representation of an expression for an unbound variable. This is used where we have a variable in use in a query and at the point of needing it we haven't yet bound the variable. For example, in the following query
```
this.names.contains(var) && var == someValue
```
in the first clause the "var" is unbound when passing in to the InvokeExpression, so it is passed in as an UnboundExpression, and in that contains() method will be bound to the collection (element) table (a join added).

- Nested Class Summary
  - Nested classes/interfaces inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression
    SQLExpression.ColumnExpressionList
- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  protected String variableName
  - Fields inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression
    lowestOperator, mapping, parameterName, st, stmt, subExprs, table
- Constructor Summary
  
  Constructors
  Constructor Description
  
  UnboundExpression(SQLStatement stmt, String variableName)
  Constructor for an SQL expression for an unbound variable.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  String getVariableName()
  Accessor for the variable name
  - Methods inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression
    add, and, bitAnd, bitOr, cast, com, distinct, div, encloseInParentheses, eor, eq, ge, getJavaTypeMapping, getLowestOperator, getNumberOfSubExpressions, getParameterName, getSQLStatement, getSQLTable, getSubExpression, gt, in, invoke, ior, is, isParameter, le, lt, mod, mul, ne, neg, not, setJavaTypeMapping, sub, toSQLText, unDistinct
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - variableName
```
protected String variableName
```
- Constructor Detail
  - UnboundExpression
```
public UnboundExpression(SQLStatement stmt,
                         String variableName)
```
    Constructor for an SQL expression for an unbound variable.
    
    Parameters:
    
    stmt - The statement
    
    variableName - name of the variable
- Method Detail
  - getVariableName
```
public String getVariableName()
```
    Accessor for the variable name
    
    Returns:
    
    Variable name that this represents