Package net.ontopia.persistence.query.sql

Class SQLColumns

java.lang.Object
net.ontopia.persistence.query.sql.SQLColumns
All Implemented Interfaces:
SQLValueIF
public class SQLColumns extends Object implements SQLValueIF
INTERNAL: Represents a set of columns from a given table. The columns are grouped for a reason. Columns are often used as join criteria.

  • Field Details

    • DEFAULT_VALUE_TYPE

      protected static final Class DEFAULT_VALUE_TYPE

    • DEFAULT_FIELD_HANDLER

      protected static final FieldHandlerIF DEFAULT_FIELD_HANDLER

    • table

      protected SQLTable table

    • cols

      protected String[] cols

    • alias

      protected String alias

    • vtype

      protected Class vtype

    • fhandler

      protected FieldHandlerIF fhandler

  • Constructor Details

  • Method Details

    • getType

      public int getType()
      Description copied from interface: SQLValueIF
      INTERNAL: Returns the value class type. The type is represented by one of the constants in the SQLValueIF interface.
      Specified by:
      getType in interface SQLValueIF

    • getArity

      public int getArity()
      Description copied from interface: SQLValueIF
      INTERNAL: Returns the [column] arity of the value. The number represents the number of "columns" the value spans, i.e. its composite width.
      Specified by:
      getArity in interface SQLValueIF

    • getValueArity

      public int getValueArity()
      Description copied from interface: SQLValueIF
      INTERNAL: Returns the value arity of the value. This number refers to the number of nested values this value contains including itself. Most values therefore have a value arity of 1. Nested values may have an arity higher than 1. SQLTuple is currently the only nested value type.
      Specified by:
      getValueArity in interface SQLValueIF

    • getAlias

      public String getAlias()
      Description copied from interface: SQLValueIF
      INTERNAL: The column alias to use if this value is included in the projection. The SQL select syntax is typically like "select value as from foo".
      Specified by:
      getAlias in interface SQLValueIF

    • setAlias

      public void setAlias(String alias)
      Description copied from interface: SQLValueIF
      INTERNAL: Sets the column alias.
      Specified by:
      setAlias in interface SQLValueIF

    • isReference

      public boolean isReference()
      Description copied from interface: SQLValueIF
      INTERNAL: Returns true if this value is a reference to another.
      Specified by:
      isReference in interface SQLValueIF

    • getReference

      public SQLValueIF getReference()
      Description copied from interface: SQLValueIF
      INTERNAL: Returns the referenced value if one exists.
      Specified by:
      getReference in interface SQLValueIF

    • getTable

      public SQLTable getTable()

    • getColumns

      public String[] getColumns()

    • getValueType

      public Class getValueType()
      Description copied from interface: SQLValueIF
      INTERNAL: Returns the value type.
      Specified by:
      getValueType in interface SQLValueIF

    • setValueType

      public void setValueType(Class vtype)
      Description copied from interface: SQLValueIF
      INTERNAL: Sets the value type.
      Specified by:
      setValueType in interface SQLValueIF

    • getFieldHandler

      public FieldHandlerIF getFieldHandler()
      INTERNAL: Returns the field handler for the columns. Default field handler is DefaultFieldHandler with type java.sql.Types.VARCHAR when not specified.
      Specified by:
      getFieldHandler in interface SQLValueIF

    • setFieldHandler

      public void setFieldHandler(FieldHandlerIF fhandler)
      Description copied from interface: SQLValueIF
      INTERNAL: Sets the field handler for the value.
      Specified by:
      setFieldHandler in interface SQLValueIF

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object