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DEPRECATED.
I reflect on a database and load RowObjects from it.
In order to do this, I interrogate a relational database to
extract schema information and interface with RowObject class
objects that can interact with specific tables.
i t =t <t >t likec C s t j j | | ƒ | | _ d S( s* Initialize me against a database.
N( R t Reflectort __init__t dbpool( t selfR t
rowClasses( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyR s c C s | j ƒ d S( N( t _transPopulateSchema( R ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt _populate% s c C s\ xL | j D]A } t | t ƒ s> t d t j | j ƒ ƒ ‚ n | j | ƒ q
Wd | _ d S( sC Used to construct the row classes in a single interaction.
s- Stub class (%s) is not derived from RowObjecti N( R t
issubclassR R R t qualt rowClasst _populateSchemaFort populated( R t rc( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyR ( s
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Wt | ƒ } | j | ƒ | _ | j | ƒ | _ | j | ƒ | _ | j | ƒ d S( s‰ Construct all the SQL templates for database operations on
<tableName> and populate the class <rowClass> with that info.
t
rowColumnst
rowKeyColumnst rowTableNames( RowClass %s must have class variable: %sN( s
rowColumnss
rowKeyColumnss rowTableName(
t hasattrR R t buildUpdateSQLt updateSQLt buildInsertSQLt insertSQLt buildDeleteSQLt deleteSQLt populateSchemaFor( R R t
attributest attt tableInfo( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyR 2 s
c C s
t | ƒ S( sä Escape a string for use in an SQL statement. The default
implementation escapes ' with '' and \ with \. Redefine this
function in a subclass if your database server uses different
escaping rules.
( R ( R t text( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt
escape_stringA s c C s t | | d | j ƒS( s› Format a value for use in an SQL statement.
@param value: a value to format as data in SQL.
@param type: a key in util.dbTypeMap.
t string_escaper( R R) ( R t valuet type( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt quote_valueI s c C s… | r | r t d ƒ ‚ n | rT | j | ƒ } | j | ƒ } | j | | ƒ } n | r] n g } | j j | j | | | | | ƒ S( se Load a set of RowObjects from a database.
Create a set of python objects of <rowClass> from the contents
of a table populated with appropriate data members.
Example::
| class EmployeeRow(row.RowObject):
| pass
|
| def gotEmployees(employees):
| for emp in employees:
| emp.manager = "fred smith"
| manager.updateRow(emp)
|
| reflector.loadObjectsFrom("employee",
| data = userData,
| whereClause = [("manager" , EQUAL, "fred smith")]
| ).addCallback(gotEmployees)
NOTE: the objects and all children should be loaded in a single transaction.
NOTE: can specify a parentRow _OR_ a whereClause.
s. Must specify one of parentRow _OR_ whereClause( R t getTableInfot getRelationshipFort buildWhereClauseR t runInteractiont
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sM immediate loading of rowobjects from the table with the whereClause.
s SELECT i i t ,s %ss FROM %s s WHERE s AND s %s %s %s( t schemaR t findTypeForR- t conditionalLabelst executet fetchallt ranget lent lowerR t findInCachet rowFactoryMethodt
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childRowClassR ( R t transactionR3 R4 R5 R6 R7 R' t sqlt firstt columnR, t wItemt
columnNamet condR+ t tt quotedValuet rowst resultst newRowst argst kwt it
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s (Internal) Build SQL template to update a RowObject.
Returns: SQL that is used to contruct a rowObject class.
s
UPDATE %s SETi s , s %s = %ss %si s WHERE s AND s %s = %s ( R R R R R ( R R' RM RN RO R, t keyColumn( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyR Æ s"
c C s« d | j } d } x: | j D]/ \ } } | s< | d } n | | } d } q W| d } d } x: | j D]/ \ } } | s‰ | d } n | d } d } qj W| d } | S( s² (Internal) Build SQL template to insert a new row.
Returns: SQL that is used to insert a new row for a rowObject
instance not created from the database.
s INSERT INTO %s (i s , i s ) VALUES (s %st )( R R ( R R' RM RN RO R, ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyR à s
c C sh d | j } d } | d } xD | j D]9 \ } } | sF | d } n | d | d f } d } q' W| S( s? Build the SQL template to delete a row from the table.
s DELETE FROM %s i s WHERE s AND s %s = %s s %si ( R R ( R R' RM RN Ra R, ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyR" ü s
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t | ƒ S( s7 Build SQL to update the contents of rowObject.
( R< R R R t __class__RG R- t
findAttributeR R. R t tuple( R t rowObjectRX R' RO R, Ra ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt updateRowSQL
s c C s, | j | ƒ } | j d ƒ | j j | ƒ S( s: Update the contents of rowObject to the database.
i ( Rg t setDirtyR t runOperation( R Rf RM ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt updateRow s
c C sl g } | j | j } x9 | j D]. \ } } | j | j | j | ƒ | ƒ ƒ q W| j | ƒ j t | ƒ S( s7 Build SQL to insert the contents of rowObject.
( R< R R RG R- Rd R. R! Re ( R Rf RX R' RO R, ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt insertRowSQL" s
&c C s, | j d ƒ | j | ƒ } | j j | ƒ S( s( Insert a new row for rowObject.
i ( Rh Rk R Ri ( R Rf RM ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt insertRow, s
c C sl g } | j | j } x9 | j D]. \ } } | j | j | j | ƒ | ƒ ƒ q W| j | ƒ j t | ƒ S( s9 Build SQL to delete rowObject from the database.
( R< R R RG R- Rd R. R# Re ( R Rf RX R' Ra R, ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt deleteRowSQL3 s c C s, | j | ƒ } | j | ƒ | j j | ƒ S( s8 Delete the row for rowObject from the database.
( Rm t removeFromCacheR Ri ( R Rf RM ( ( sC /usr/lib/python2.7/dist-packages/twisted/enterprise/sqlreflector.pyt deleteRow? s
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