Package gavo :: Package adql :: Module fieldinfos :: Class QueryFieldInfos

Class QueryFieldInfos

object --+    
         |    
FieldInfos --+
             |
            QueryFieldInfos

FieldInfos inferred from a FROM clause.

To instanciate those, use the makeForNode class method below.

Instance Methods

getFieldInfoFromSources(self, colName, refName=None)
returns a field info for colName from anything in the from clause.

source code

getFieldInfo(self, colName, refName=None)
returns a field info for colName in self or any tables this query takes columns from.

source code

Inherited from FieldInfos: __init__, __repr__, addColumn, assertIsCompatible, locateTable

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Methods

makeForNode(cls, queryNode, context)
cf.

source code

Class Variables
	enclosingQuery = `None` hash(x)

Properties
Inherited from `object`: `__class__`

Method Details

makeForNode(cls, queryNode, context)
Class Method

source code

cf. TableFieldInfos.makeForNode.

getFieldInfoFromSources(self, colName, refName=None)

source code

returns a field info for colName from anything in the from clause.

That is, the columns in the select clause are ignored. Use this to resolve expressions from the queries' select clause.

See getFieldInfo for refName

getFieldInfo(self, colName, refName=None)

source code

returns a field info for colName in self or any tables this query takes columns from.

To do that, it collects all fields of colName in self and subTables and returns the matching field if there's exactly one. Otherwise, it will raise ColumnNotFound or AmbiguousColumn.

If the node.TableName instance refName is given, the search will be restricted to the matching tables.

Overrides: FieldInfos.getFieldInfo

Class QueryFieldInfos

makeForNode(cls, queryNode, context) Class Method

getFieldInfoFromSources(self, colName, refName=None)

getFieldInfo(self, colName, refName=None)

makeForNode(cls, queryNode, context)
Class Method