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

java.lang.Object
  extended by org.datanucleus.store.rdbms.sql.expression.SQLExpression
      extended by org.datanucleus.store.rdbms.sql.expression.StringExpression
          extended by org.datanucleus.store.rdbms.sql.expression.StringLiteral
All Implemented Interfaces:
SQLLiteral

public class StringLiteral
extends StringExpression
implements SQLLiteral

Representation of a string literal.


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
isParameter, LOCALISER, lowestOperator, mapping, st, stmt, subExprs, table
 
Constructor Summary
StringLiteral(SQLStatement stmt, org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping, java.lang.Object value, boolean parameter)
          Constructor for a String literal with a value.
 
Method Summary
 SQLExpression add(SQLExpression expr)
          Additive Operator.
 BooleanExpression eq(SQLExpression expr)
          Equality operator (equals to)
 BooleanExpression ge(SQLExpression expr)
          Relational operator (greater than or equals)
 void generateStatementWithoutQuotes()
          Convenience method to generate the statement without any quotes.
 java.lang.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 setNotParameter()
          Method to set this literal as not being a parameter.
protected  void setStatement()
           
 
Methods inherited from class org.datanucleus.store.rdbms.sql.expression.StringExpression
in, invoke
 
Methods inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression
and, cast, checkForAndCorrectParameterComparison, com, div, encloseInParentheses, eor, getJavaTypeMapping, getNumberOfSubExpressions, getSQLStatement, getSQLTable, ior, is, isParameter, mod, mul, neg, not, sub, toSQLText
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

StringLiteral

public StringLiteral(SQLStatement stmt,
                     org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping,
                     java.lang.Object value,
                     boolean parameter)
Constructor for a String literal with a value.

Parameters:
stmt - the SQL statement
mapping - the mapping
value - the value
parameter - Whether this is a parameter (JDBC "?")
Method Detail

generateStatementWithoutQuotes

public void generateStatementWithoutQuotes()
Convenience method to generate the statement without any quotes. This is called when we create a literal using a mapping, and don't want quotes because the string is an SQL keyword.


getValue

public java.lang.Object getValue()
Description copied from interface: SQLLiteral
Accessor to the literal value

Specified by:
getValue in interface SQLLiteral
Returns:
the value of the literal

eq

public BooleanExpression eq(SQLExpression expr)
Description copied from class: SQLExpression
Equality operator (equals to)

Overrides:
eq in class StringExpression
Parameters:
expr - the right-hand operand
Returns:
The type of an equality expression is a boolean

ne

public BooleanExpression ne(SQLExpression expr)
Description copied from class: SQLExpression
Not equality operator (not equals to)

Overrides:
ne in class StringExpression
Parameters:
expr - the right-hand operand
Returns:
The type of an equality expression is a boolean

lt

public BooleanExpression lt(SQLExpression expr)
Description copied from class: SQLExpression
Relational operator (lower than)

Overrides:
lt in class StringExpression
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.

le

public BooleanExpression le(SQLExpression expr)
Description copied from class: SQLExpression
Relational operator (lower than or equals)

Overrides:
le in class StringExpression
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.

gt

public BooleanExpression gt(SQLExpression expr)
Description copied from class: SQLExpression
Relational operator (greater than)

Overrides:
gt in class StringExpression
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.

ge

public BooleanExpression ge(SQLExpression expr)
Description copied from class: SQLExpression
Relational operator (greater than or equals)

Overrides:
ge in class StringExpression
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.

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 StringExpression
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;

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

setStatement

protected void setStatement()


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