Class StringExpression

java.lang.Object
org.datanucleus.store.rdbms.sql.expression.SQLExpression
org.datanucleus.store.rdbms.sql.expression.StringExpression
Direct Known Subclasses:
AggregateStringExpression, CaseStringExpression, StringLiteral, StringSubqueryExpression
public class StringExpression extends SQLExpression
Representation of an expression with a string.

  • Constructor Details

    • StringExpression

      public StringExpression(SQLStatement stmt, SQLTable table, 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.store.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.store.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(SQLStatement stmt, JavaTypeMapping mapping, String functionName, List<SQLExpression> args)
      Generates statement as e.g. FUNCTION_NAME(arg[,argN]).
      Parameters:
      stmt - SQL Statement
      mapping - Mapping to use
      functionName - Name of the function
      args - ScalarExpression list

    • StringExpression

      public StringExpression(SQLStatement stmt, JavaTypeMapping mapping, String functionName, List<SQLExpression> args, List types)
      Generates statement as e.g. FUNCTION_NAME(arg AS type[,argN as typeN]).
      Parameters:
      stmt - SQL Statement
      mapping - Mapping to use
      functionName - Name of function
      args - ScalarExpression list
      types - String or ScalarExpression list

  • Method Details

    • 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, boolean not)
      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
      not - Whether we really want "not in"
      Returns:
      true if the left-hand expression is contained by the right-hand expression. Otherwise the result is false.

    • invoke

      public SQLExpression invoke(String methodName, List<SQLExpression> 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