org.datanucleus.store.rdbms.sql.expression
Class UnboundExpression

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

protected String

variableName

Fields inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

LOCALISER, lowestOperator, mapping, parameterName, st, stmt, subExprs, table

Constructor Summary

UnboundExpression(SQLStatement stmt, String variableName)
Constructor for an SQL expression for an unbound variable.

Method Summary

String

getVariableName() Accessor for the variable name

Methods inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

add, and, 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

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