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

java.lang.Object
  org.datanucleus.store.rdbms.sql.expression.SQLExpression
      org.datanucleus.store.rdbms.sql.expression.ColumnExpression

public class ColumnExpression
extends SQLExpression

Representation of a column expression. Used within ObjectExpression for handling particular columns representing an object.

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

SQLExpression.ColumnExpressionList

Field Summary

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

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

Constructor Summary

protected	ColumnExpression(SQLStatement stmt, Object value) Constructor for an SQL expression for a literal value.
protected	ColumnExpression(SQLStatement stmt, SQLTable table, Column col) Constructor for an SQL expression for a column.
protected	ColumnExpression(SQLStatement stmt, String parameterName, org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping, Object value, int colNumber) Constructor for an SQL expression for a parameter.

Method Summary

BooleanExpression	eq(SQLExpression expr) Equality operator (equals to)
BooleanExpression	noteq(SQLExpression expr)
String	toString() Stringifier method to return this "column" in a form for use in SQL statements.

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

add, and, cast, com, distinct, div, encloseInParentheses, eor, 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, wait, wait, wait

Constructor Detail

ColumnExpression

protected ColumnExpression(SQLStatement stmt,
                           String parameterName,
                           org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping,
                           Object value,
                           int colNumber)

Constructor for an SQL expression for a parameter.

Parameters:

stmt - The statement

parameterName - Name of the parameter

mapping - Mapping for the column

value - The value for the parameter for this column

colNumber - Column number of the mapping being represented here

ColumnExpression

protected ColumnExpression(SQLStatement stmt,
                           SQLTable table,
                           Column col)

Constructor for an SQL expression for a column.

Parameters:

stmt - The statement

table - The table in the statement

col - The column

ColumnExpression

protected ColumnExpression(SQLStatement stmt,
                           Object value)

Constructor for an SQL expression for a literal value.

Parameters:

stmt - The statement

value - The literal value

Method Detail

eq

public BooleanExpression eq(SQLExpression expr)

Description copied from class: SQLExpression

Equality operator (equals to)

Overrides:

eq in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

The type of an equality expression is a boolean

noteq

public BooleanExpression noteq(SQLExpression expr)

toString

public String toString()

Stringifier method to return this "column" in a form for use in SQL statements. This can be of the following form(s)

 TABLEALIAS.MYCOLUMN
 MYTABLE.MYCOLUMN
 

Overrides:

toString in class Object

Returns:

The String form for use