Schema::AbstractSchema Class Reference

the AbstractSchema class is a base class to assist with automatic schema management More...

Inheritance diagram for Schema::AbstractSchema:

Public Member Methods
int	align (bool force=False, int verbose=0)
	executes a schema alignment action on the database with the current schema template More...
	constructor (Qore::SQL::AbstractDatasource n_ds, *string dts, *string its, *hash opts)
	creates the object from the arguments More...
	drop (bool force=False, int verbose=0)
	executes a schema drop operation in the database
*hash	getColumnOptions ()
	returns column options More...
*hash	getCreateOnlyReferenceData ()
	returns a hash of "create-only reference data", describing data that is written to the table when the table is created More...
*hash	getCreationOptions ()
	returns schema creation options More...
SqlUtil::AbstractDatabase	getDatabase ()
	returns the AbstractDatabase object used for the schema
Qore::SQL::AbstractDatasource	getDatasource ()
	returns the datasource used for the schema
*hash	getFunctions ()
	returns function definitions More...
*hash	getIndexOptions ()
	returns index options More...
*hash	getInsertOnlyReferenceData ()
	returns a hash of "create-only reference data", describing data that will only be inserted if missing, otherwise existing rows with changed data are left unchanged More...
*hash	getMaterializedViews ()
	returns materialized view definitions More...
string	getName ()
	returns the name of the schema
*hash	getPackages ()
	returns (Oracle) package definitions More...
*hash	getProcedures ()
	returns stored procedure definitions More...
*hash	getReferenceDataHash ()
	returns a hash of "normal reference data", describing data that must appear in the target table, however additional rows are also acceptable More...
*hash	getSequences ()
	returns sequence definitions More...
*hash	getStrictReferenceDataHash ()
	returns a hash of "strict reference data", describing the only data that can appear in the target table More...
*hash	getTables ()
	returns table definitions More...
*hash	getTypes ()
	returns type definitions More...
string	getVersion ()
	returns the version of the schema
	log (string fmt)
	outputs a log message More...
	logpf (string fmt)
	outputs a log message prefixed with the schema name More...
	logProgress (string str)
	outputs a log message without any newline More...

Static Public Member Methods
static hash	combineOptions (*hash h)
	combines option hashes into a single target option hash
static list	getRows (*softlist l)
	returns a list of hashes from a list of lists where the first list element in the top-level list is a list of column names, and subsequent lists are column values More...

Private Member Methods
bool	checkDropSchema (bool force)
	this method returns True if the schema can be dropped
bool	checkExistence ()
	returns True if the method can detect that DB objects defined in the schema exist in the database More...
bool	checkFirstTimeInstall ()
	returns True if checkExistence() returns False
bool	checkUpdateSchema (bool force, reference< hash< auto >> initial_schema_info)
	this method returns True if the schema can be updated
	doPostAlignment (Tables table_cache, bool first_time_install, *hash< auto > initial_schema_info, int verbose)
	this method is called after schema structural alignment has been executed but before schema reference data management
	doPostAlignment (Tables table_cache, bool first_time_install, *hash< auto > initial_schema_info)
	this method is called after schema structural alignment has been executed but before schema reference data management
	doTable (AbstractTable table, list rows, int upsert_strategy, bool delete_others, int verbose, reference< hash > sh)
	this method is called to perform schema reference data managment on the given table with the given data
*hash	getColumnOptionsImpl ()
	returns column options More...
*hash	getCreateOnlyReferenceDataImpl ()
	returns a hash of "create-only reference data", describing data that is written to the table when the table is created More...
*hash	getFunctionsImpl ()
	returns function definitions More...
*hash	getGenericOptionsImpl ()
	returns schema creation options More...
*hash	getIndexOptionsImpl ()
	returns index options More...
*hash	getInsertOnlyReferenceDataImpl ()
	returns a hash of "insert-only reference data", describing data that will only be inserted if missing, otherwise existing rows with changed data are left unchanged More...
*hash	getMaterializedViewsImpl ()
	returns materialized view definitions More...
abstract string	getNameImpl ()
	returns the name of the schema
*hash	getPackagesImpl ()
	returns (Oracle) package definitions More...
*hash	getProceduresImpl ()
	returns stored procedure definitions More...
*hash	getReferenceDataHashImpl ()
	returns a hash of "normal reference data", describing data that must appear in the target table, however additional rows are also acceptable More...
*hash	getSequencesImpl ()
	returns sequence definitions More...
*hash	getStrictReferenceDataHashImpl ()
	returns a hash of "strict reference data", describing the only data that can appear in the target table More...
*hash	getTablesImpl ()
	returns table definitions More...
*hash	getTypesImpl ()
	returns type definitions More...
int	getUpsertStrategy (bool first_time_install)
	this method is called to return the upsert strategy before schema reference data management
abstract string	getVersionImpl ()
	returns the version of the schema
	postDataActions (Tables table_cache, bool first_time_install, *hash< auto > initial_schema_info, int verbose)
	this method is called after schema reference data has been managed
	postDataActions (bool first_time_install)
	this method is called after schema reference data has been managed

Private Attributes
*hash	all_options
	combined creation and column options
hash	callback_opts
	callback options plus all options
*hash	column_options
	column options, as provided by getColumnOptions()
*hash	creation_options
	creation options, as provided by getCreationOptions()
*string	data_ts
	explicit data tablespace name
SqlUtil::Database	db
	the Database object for the schema
string	drv
	the name of the database driver
Qore::SQL::AbstractDatasource	ds
	the datasource for the schema
*hash	index_options
	index options, as provided by getIndexOptions()
*string	index_ts
	explicit index tablespace name
code	info_callback
	the info callback for schema operations; can be used for explicit logging
string	name
	the name of the schema
hash	pure_callback_opts
	just callback options
hash	schema
	the schema template, as assembled from method callbacks providing schema element definitions
string	version
	the version of the schema

Detailed Description

the AbstractSchema class is a base class to assist with automatic schema management

This class allows the following actions to be performed:

• schema creation, upgrades, and downgrades (through schema alignment)
• schema deletion / dropping

This class does not provide for any intelligence based on the schema template's version and a schema version string stored in the schema itself; this is provided instead by the AbstractVersionedSchema class.

The following abstract methods must be re-implemented in subclasses to define basic schema attributes:

• getNameImpl(): returns the schema name
• getVersionImpl(): returns the schema version

The following methods should be re-implemented in subclasses to define schema definitions from which DDL will be generated::

• getTablesImpl(): returns table definitions
• getSequencesImpl(): returns sequence definitions
• getTypesImpl(): returns type definitions
• getFunctionsImpl(): returns function definitions
• getProceduresImpl(): returns procedure definitions
• getPackagesImpl(): returns (Oracle) package definitions
• getMaterializedViewsImpl(): returns materialized view definitions

The following methods should be re-implemented in subclasses to define schema creation options to affect the generated DDL:

• getIndexOptionsImpl(): returns index options
• getColumnOptionsImpl(): returns column options
• getGenericOptionsImpl(): returns generic options

The following methods should be re-implemented in subclasses to define schema reference data:

• getStrictReferenceDataHashImpl(): returns a hash of "strict reference data", describing the only data that can appear in the target table
• getReferenceDataHashImpl(): returns a hash of "normal reference data", describing data that must appear in the target table, however additional rows are also acceptable
• getCreateOnlyReferenceDataImpl(): returns a hash of "create-only reference data", describing data that is written to the table when the table is created
• getInsertOnlyReferenceDataImpl(): returns a hash of "insert-only reference data", describing data that will only be inserted if missing, otherwise existing rows with changed data are left unchanged

Member Function Documentation

align()

int Schema::AbstractSchema::align	(	bool	force = False,
		int	verbose = 0
	)

executes a schema alignment action on the database with the current schema template

this causes the database to be aligned with the schema template, which will result in:

• the schema being created in an empty schema
• the schema being upgraded if an older version of the schema exists in the database
• the schema being downgraded if a newer version of the schema exists in the database

Note

if other database objects not belonging to the schema already exist in the given database, they are not touched unless explicitly dropped by upgrade or downgrade code in the schema class; note that any undefined attributes of tables defined in the schema (columns, indexes, constraints, etc) will be dropped however

checkExistence()

bool Schema::AbstractSchema::checkExistence ( )

private

returns True if the method can detect that DB objects defined in the schema exist in the database

Currently this method checks if any of tables, sequences, functions, or procedures defined in the schema template exists. If so, this method returns True, otherwise it returns False

constructor()

Schema::AbstractSchema::constructor	(	Qore::SQL::AbstractDatasource	n_ds,
		*string	dts,
		*string	its,
		*hash	opts
	)

creates the object from the arguments

Parameters

n_ds	the datasource for the schema
dts	an optional data tablespace name for the schema
its	an optional index tablespace name for the schema
opts	options for SqlUtil::Database::constructor()

getColumnOptions()

*hash Schema::AbstractSchema::getColumnOptions

(

)

returns column options

this function wraps getColumnOptionsImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getColumnOptionsImpl()

getColumnOptionsImpl()

*hash Schema::AbstractSchema::getColumnOptionsImpl ( )

private

returns column options

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom options

getCreateOnlyReferenceData()

*hash Schema::AbstractSchema::getCreateOnlyReferenceData

(

)

returns a hash of "create-only reference data", describing data that is written to the table when the table is created

this function wraps (); for forwards-compatibility, do not override this method in subclasses, instead re-implement ()

getCreateOnlyReferenceDataImpl()

*hash Schema::AbstractSchema::getCreateOnlyReferenceDataImpl ( )

private

returns a hash of "create-only reference data", describing data that is written to the table when the table is created

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getCreationOptions()

*hash Schema::AbstractSchema::getCreationOptions

(

)

returns schema creation options

this function wraps getGenericOptionsImpl() and getIndexOptionsImpl() and sets the data and index tablespace names as creation options automatically if set in the constructor() if not already set

getFunctions()

*hash Schema::AbstractSchema::getFunctions

(

)

returns function definitions

this function wraps getFunctionsImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getFunctionsImpl()

getFunctionsImpl()

*hash Schema::AbstractSchema::getFunctionsImpl ( )

private

returns function definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getGenericOptionsImpl()

*hash Schema::AbstractSchema::getGenericOptionsImpl ( )

private

returns schema creation options

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom options

getIndexOptions()

*hash Schema::AbstractSchema::getIndexOptions

(

)

returns index options

this function wraps getIndexOptionsImpl() and sets the index tablespace name as an index option automatically if set in the constructor() if not already set

getIndexOptionsImpl()

*hash Schema::AbstractSchema::getIndexOptionsImpl ( )

private

returns index options

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom options

getInsertOnlyReferenceData()

*hash Schema::AbstractSchema::getInsertOnlyReferenceData

(

)

returns a hash of "create-only reference data", describing data that will only be inserted if missing, otherwise existing rows with changed data are left unchanged

this function wraps (); for forwards-compatibility, do not override this method in subclasses, instead re-implement ()

getInsertOnlyReferenceDataImpl()

*hash Schema::AbstractSchema::getInsertOnlyReferenceDataImpl ( )

private

returns a hash of "insert-only reference data", describing data that will only be inserted if missing, otherwise existing rows with changed data are left unchanged

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getMaterializedViews()

*hash Schema::AbstractSchema::getMaterializedViews

(

)

returns materialized view definitions

this function wraps getMaterializedViewsImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getMaterializedViewsImpl()

getMaterializedViewsImpl()

*hash Schema::AbstractSchema::getMaterializedViewsImpl ( )

private

returns materialized view definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getPackages()

*hash Schema::AbstractSchema::getPackages

(

)

returns (Oracle) package definitions

this function wraps getPackagesImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getPackagesImpl()

getPackagesImpl()

*hash Schema::AbstractSchema::getPackagesImpl ( )

private

returns (Oracle) package definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getProcedures()

*hash Schema::AbstractSchema::getProcedures

(

)

returns stored procedure definitions

this function wraps getProceduresImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getProceduresImpl()

getProceduresImpl()

*hash Schema::AbstractSchema::getProceduresImpl ( )

private

returns stored procedure definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getReferenceDataHash()

*hash Schema::AbstractSchema::getReferenceDataHash

(

)

returns a hash of "normal reference data", describing data that must appear in the target table, however additional rows are also acceptable

this function wraps getReferenceDataHashImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getReferenceDataHashImpl()

getReferenceDataHashImpl()

*hash Schema::AbstractSchema::getReferenceDataHashImpl ( )

private

returns a hash of "normal reference data", describing data that must appear in the target table, however additional rows are also acceptable

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getRows()

static list Schema::AbstractSchema::getRows ( *softlist  l )

static

returns a list of hashes from a list of lists where the first list element in the top-level list is a list of column names, and subsequent lists are column values

meant to be used to translate reference data lists into lists of hashes to be used for upserting in reference data tables during schema management

getSequences()

*hash Schema::AbstractSchema::getSequences

(

)

returns sequence definitions

this function wraps getSequencesImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getSequencesImpl()

getSequencesImpl()

*hash Schema::AbstractSchema::getSequencesImpl ( )

private

returns sequence definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getStrictReferenceDataHash()

*hash Schema::AbstractSchema::getStrictReferenceDataHash

(

)

returns a hash of "strict reference data", describing the only data that can appear in the target table

this function wraps getStrictReferenceDataHashImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getStrictReferenceDataHashImpl()

getStrictReferenceDataHashImpl()

*hash Schema::AbstractSchema::getStrictReferenceDataHashImpl ( )

private

returns a hash of "strict reference data", describing the only data that can appear in the target table

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getTables()

*hash Schema::AbstractSchema::getTables

(

)

returns table definitions

this function wraps getTablesImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getTablesImpl()

getTablesImpl()

*hash Schema::AbstractSchema::getTablesImpl ( )

private

returns table definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

getTypes()

*hash Schema::AbstractSchema::getTypes

(

)

returns type definitions

this function wraps getTypesImpl(); for forwards-compatibility, do not override this method in subclasses, instead re-implement getTypesImpl()

getTypesImpl()

*hash Schema::AbstractSchema::getTypesImpl ( )

private

returns type definitions

the default behavior of this method is to return NOTHING, reimplement in subclasses to return custom configuration

log()

Schema::AbstractSchema::log

(

string

fmt

)

outputs a log message

the log string is output with a following newline, and the terminal I/O is flushed

logpf()

Schema::AbstractSchema::logpf

(

string

fmt

)

outputs a log message prefixed with the schema name

the log string is output with a following newline, and the terminal I/O is flushed

logProgress()

Schema::AbstractSchema::logProgress

(

string

str

)

outputs a log message without any newline

the terminal I/O is flushed as well