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

java.lang.Object
  extended by org.datanucleus.store.rdbms.sql.expression.SQLExpression
      extended by org.datanucleus.store.rdbms.sql.expression.StringExpression
Direct Known Subclasses:
StringLiteral

public class StringExpression
extends SQLExpression

Representation of an expression with a string.


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
StringExpression(org.datanucleus.query.expression.Expression.MonadicOperator op, SQLExpression expr1)
          Perform an operation
StringExpression(org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping, java.lang.String functionName, java.util.List args)
          Generates statement as e.g.
StringExpression(org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping, java.lang.String functionName, java.util.List args, java.util.List types)
          Generates statement as e.g.
StringExpression(SQLExpression expr1, org.datanucleus.query.expression.Expression.DyadicOperator op, SQLExpression expr2)
          Perform an operation
StringExpression(SQLStatement stmt, SQLTable table, org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping)
          Constructor for an SQL expression for a (field) mapping in a specified table.
 
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)
 BooleanExpression gt(SQLExpression expr)
          Relational operator (greater than)
 BooleanExpression in(SQLExpression expr)
          In expression.
 SQLExpression invoke(java.lang.String methodName, java.util.List args)
          Invocation of a method on this expression.
 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)
 
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

StringExpression

public StringExpression(SQLStatement stmt,
                        SQLTable table,
                        org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping)
Constructor for an SQL expression for a (field) mapping in a specified table.

Parameters:
stmt - The statement
table - The table in the statement
mapping - The mapping for the field

StringExpression

public StringExpression(org.datanucleus.query.expression.Expression.MonadicOperator op,
                        SQLExpression expr1)
Perform an operation
op
on expression
expr1
.

Parameters:
op - operator
expr1 - operand

StringExpression

public StringExpression(SQLExpression expr1,
                        org.datanucleus.query.expression.Expression.DyadicOperator op,
                        SQLExpression expr2)
Perform an operation
op
between
expr1
and
expr2
.

Parameters:
expr1 - the first expression
op - the operator between operands
expr2 - the second expression

StringExpression

public StringExpression(org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping,
                        java.lang.String functionName,
                        java.util.List args)
Generates statement as e.g. FUNCTION_NAME(arg[,argN]).

Parameters:
mapping - Mapping to use
functionName -
args - ScalarExpression list

StringExpression

public StringExpression(org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping,
                        java.lang.String functionName,
                        java.util.List args,
                        java.util.List types)
Generates statement as e.g. FUNCTION_NAME(arg AS type[,argN as typeN]).

Parameters:
mapping - Mapping to use
functionName - Name of function
args - ScalarExpression list
types - String or ScalarExpression list
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

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

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.

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.

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.

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.

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;

in

public BooleanExpression in(SQLExpression expr)
Description copied from class: SQLExpression
In expression. Return true if this is contained by expr

Overrides:
in in class SQLExpression
Parameters:
expr - the right-hand expression
Returns:
true if the left-hand expression is contained by the right-hand expression. Otherwise the result is false.

invoke

public SQLExpression invoke(java.lang.String methodName,
                            java.util.List args)
Description copied from class: SQLExpression
Invocation of a method on this expression.

Overrides:
invoke in class SQLExpression
Parameters:
methodName - name of the method to invoke
args - Args to this method (if any)
Returns:
the converted value


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