gnue.common Public API - GNU Enterprise

Package gnue :: Package common :: Package datasources :: Package drivers :: Package sql :: Package maxdb :: Module Behavior :: Class Behavior

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Class Behavior

Behavior --+    
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    Behavior --+
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              Behavior

Behavior class for MaxDB/SAP-DB backends.

Limitations:

MaxDB has no named primary keys, so we build them from "pk_<tablename>"

Method Summary
	`__init__(self, connection)` Create a new Behavior instance.
	`_createDatabase_(self)` Create a new database instance as defined by the connection's parameters.
	`_defaultwith_(self, code, field)` Handle special defaults like 'serial' and 'timestamp'.
	`_readSchema_(self, parent)` Read the connection's schema and build a GSchema object tree connected to the given parent object (which is of type GSSchema).
	`string(self, field)` Return the native datatype for string fields
Inherited from Behavior
	`_create_table_trailer_(self, table)` Create trailing SQL code for building a table.
	`_createConstraint_(self, constraint)` Create a code triple for the given constraint.
	`_createFields_(self, item)` Create a code-triple for the given GSTable or GSField.
	`_createIndex_(self, index)` Create a code triple for the given index.
	`_createPrimaryKey_(self, pkey)` Create a code triple for the given primary key.
	`_createTable_(self, table)` Generate a code-triple to create or change the given table.
	`_dropConstraint_(self, constraint)` Create a command sequence for dropping the given constraint.
	`_dropIndex_(self, index)` Create a command sequence for dropping the given index.
	`_integrateNullable_(self, code, field)` Handle the nullable-flag of a given field.
	`_processField_(self, field)` Create a code-triple for a single field.
	`_setColumnDefault_(self, code, field, default)` Set a default value for a given column.
	`_writeSchema_(self, current, new, diff, simulation)` Integrate the given schema into the current connection's schema and return the commands used to achive this.
	`number(self, field)` Return the native datatye for a numeric field.
Inherited from Behavior
	`__repr__(self)`
	`createDatabase(self)` Create a new database specified by the associated connection.
	`readSchema(self)` Retrieve the connection's schema information and return it as `GSchema` object tree.
	`writeSchema(self, schema, simulation)` Generate a command sequence to integrate the given schema tree into the connection's current schema.

Class Variable Summary
Inherited from Behavior
`bool`	`_alterMultiple_`: boolean flag indicating wether an 'alter table' statement can contain multiple fields or not.
`bool`	`_extraPrimaryKey_`: boolean flag indicating wether primary keys must be added with an extra command (ie.
`tuple`	`_numbers_`: triple specifying rules for datatype transformation of numeric types.
`dict`	`_type2native_`: dictionary mapping field-types to native datatypes.
`list`	`_writeableTypes_`: list of GSTables-types to be handled by writeSchema ().
Inherited from Behavior
`NoneType`	`_maxIdLength_`: maximum length of an identifier or None if no restriction.

Method Details

init(self, connection)
(Constructor)

Create a new Behavior instance.

This is usually done silently when creating a connection instance.

Parameters:: connection - The Connection.Connection instance bound to this Behavior instance.

Overrides:: gnue.common.datasources.drivers.Base.Behavior.Behavior.__init__ (inherited documentation)

_createDatabase_(self)

Create a new database instance as defined by the connection's parameters. The user will be asked for a username and password who is member of the SDBA group on the backend system and theirfore allowed to create new instances. If the database already exists no action takes place.

Overrides:: gnue.common.datasources.drivers.Base.Behavior.Behavior._createDatabase_

_defaultwith_(self, code, field)

Handle special defaults like 'serial' and 'timestamp'.

Parameters:: code - code-triple to merge the result in; field - GSField instance with the default definition

Overrides:: gnue.common.datasources.drivers.DBSIG2.Behavior.Behavior._defaultwith_

_readSchema_(self, parent)

Read the connection's schema and build a GSchema object tree connected to the given parent object (which is of type GSSchema).

Overrides:: gnue.common.datasources.drivers.Base.Behavior.Behavior._readSchema_

string(self, field)

Return the native datatype for string fields

Parameters:: field - GSField instance to get a native datatype for

Returns:: 'VARCHAR (?)' or 'LONG'

Overrides:: gnue.common.datasources.drivers.DBSIG2.Behavior.Behavior.string

Class Behavior

init(self, connection)
(Constructor)

_createDatabase_(self)

_defaultwith_(self, code, field)

_readSchema_(self, parent)

string(self, field)

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Class Behavior

__init__(self, connection) (Constructor)

_createDatabase_(self)

_defaultwith_(self, code, field)

_readSchema_(self, parent)

string(self, field)

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Developer's Corner

init(self, connection)
(Constructor)