Package org.datanucleus.store.rdbms.sql.expression

Class ParameterLiteral

java.lang.Object

org.datanucleus.store.rdbms.sql.expression.SQLExpression

org.datanucleus.store.rdbms.sql.expression.ParameterLiteral

All Implemented Interfaces:

SQLLiteral

public class ParameterLiteral
extends SQLExpression
implements SQLLiteral

Representation of a literal representing a parameter where we don't know the type of the parameter yet. This literal doesn't have a long lifetime, being replaced during the process of conversion to SQL using the compared expression to define the mapping (and hence which literal type) to use.

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	name	Parameter name.
protected Object	value

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

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

Constructor Summary

Constructors

Constructor	Description
ParameterLiteral(SQLStatement stmt, JavaTypeMapping mapping, Object value, String parameterName)	Constructor for an integer literal with a value.

Method Summary

Modifier and Type	Method	Description
SQLExpression	add(SQLExpression expr)	Additive Operator.
BooleanExpression	eq(SQLExpression expr)	Equality operator (equals to)
BooleanExpression	ge(SQLExpression expr)	Relational operator (greater than or equals)
String	getName()
Object	getValue()	Accessor to the literal value
BooleanExpression	gt(SQLExpression expr)	Relational operator (greater than)
BooleanExpression	le(SQLExpression expr)	Relational operator (lower than or equals)
BooleanExpression	lt(SQLExpression expr)	Relational operator (lower than)
BooleanExpression	ne(SQLExpression expr)	Not equality operator (not equals to)
void	setName(String name)
void	setNotParameter()	Method to set this literal as not being a parameter.

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

and, bitAnd, bitOr, cast, com, distinct, div, encloseInParentheses, eor, getJavaTypeMapping, getLowestOperator, getNumberOfSubExpressions, getParameterName, getSQLStatement, getSQLTable, getSubExpression, in, invoke, ior, is, isParameter, mod, mul, 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

name

protected String name

Parameter name.

value

protected Object value

Constructor Detail

ParameterLiteral

public ParameterLiteral(SQLStatement stmt,
                        JavaTypeMapping mapping,
                        Object value,
                        String parameterName)

Constructor for an integer literal with a value.

Parameters:

stmt - the SQL statement

mapping - the mapping

value - the value

parameterName - Name of the parameter that this represents if any (as JDBC "?")

Method Detail

setName

public void setName(String name)

getName

public String getName()

getValue

public Object getValue()

Description copied from interface: SQLLiteral

Accessor to the literal value

Specified by:

getValue in interface SQLLiteral

Returns:

the value of the literal

add

public SQLExpression add(SQLExpression expr)

Description copied from class: SQLExpression

Additive Operator. The binary + operator performs addition when applied to two operands of numeric type, producing the sum of the operands. If the type of either operand of a + operator is String, then the operation is string concatenation.

Overrides:

add in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

If one of the operands is String, the returned value is the string concatenation; The sum of two operands of numeric type. The left-hand operand is the minuend and the right-hand operand is the subtrahend;

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

ge

public BooleanExpression ge(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (greater than or equals)

Overrides:

ge in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is greater than or equal the value of the right-hand operand, and otherwise is false.

gt

public BooleanExpression gt(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (greater than)

Overrides:

gt in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is greater than the value of the right-hand operand, and otherwise is false.

le

public BooleanExpression le(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (lower than or equals)

Overrides:

le in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is less than or equal to the value of the right-hand operand, and otherwise is false.

lt

public BooleanExpression lt(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (lower than)

Overrides:

lt in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is less than the value of the right-hand operand, and otherwise is false.

ne

public BooleanExpression ne(SQLExpression expr)

Description copied from class: SQLExpression

Not equality operator (not equals to)

Overrides:

ne in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

The type of an equality expression is a boolean

setNotParameter

public void setNotParameter()

Description copied from interface: SQLLiteral

Method to set this literal as not being a parameter. If the literal if not currently a parameter then does nothing. Updates any underlying SQL to have the value.

Specified by:

setNotParameter in interface SQLLiteral