SQLColumns (Ontopia)

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 Summary

Fields
Modifier and Type	Field and Description
`protected String`	`alias`
`protected String[]`	`cols`
`protected static FieldHandlerIF`	`DEFAULT_FIELD_HANDLER`
`protected static Class`	`DEFAULT_VALUE_TYPE`
`protected FieldHandlerIF`	`fhandler`
`protected SQLTable`	`table`
`protected Class`	`vtype`

Fields inherited from interface net.ontopia.persistence.query.sql.SQLValueIF
COLUMNS, FUNCTION, NULL, PARAMETER, PRIMITIVE, TUPLE, VERBATIM

Constructor Summary

Constructors
Constructor and Description

SQLColumns(SQLTable table, String col)

SQLColumns(SQLTable table, String[] cols)

Constructors
Constructor and Description
`SQLColumns(SQLTable table, String col)`
`SQLColumns(SQLTable table, String[] cols)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object obj)`
`String`	`getAlias()` INTERNAL: The column alias to use if this value is included in the projection.
`int`	`getArity()` INTERNAL: Returns the [column] arity of the value.
`String[]`	`getColumns()`
`FieldHandlerIF`	`getFieldHandler()` INTERNAL: Returns the field handler for the columns.
`SQLValueIF`	`getReference()` INTERNAL: Returns the referenced value if one exists.
`SQLTable`	`getTable()`
`int`	`getType()` INTERNAL: Returns the value class type.
`int`	`getValueArity()` INTERNAL: Returns the value arity of the value.
`Class`	`getValueType()` INTERNAL: Returns the value type.
`int`	`hashCode()`
`boolean`	`isReference()` INTERNAL: Returns true if this value is a reference to another.
`void`	`setAlias(String alias)` INTERNAL: Sets the column alias.
`void`	`setFieldHandler(FieldHandlerIF fhandler)` INTERNAL: Sets the field handler for the value.
`void`	`setValueType(Class vtype)` INTERNAL: Sets the value type.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - 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 Detail
  - SQLColumns
```
public SQLColumns(SQLTable table,
                  String col)
```
  - SQLColumns
```
public SQLColumns(SQLTable table,
                  String[] cols)
```
- Method Detail
  - 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

Class SQLColumns

Field Summary

Fields inherited from interface net.ontopia.persistence.query.sql.SQLValueIF

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_VALUE_TYPE

DEFAULT_FIELD_HANDLER

table

cols

alias

vtype

fhandler

Constructor Detail

SQLColumns

SQLColumns

Method Detail

getType

getArity

getValueArity

getAlias

setAlias

isReference

getReference

getTable

getColumns

getValueType

setValueType

getFieldHandler

setFieldHandler

hashCode

equals

toString