Qore SqlUtil Module Reference 1.0

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SqlUtil::Tables Class Reference

the table container class stores a collection of tables in a schema More...

Inheritance diagram for SqlUtil::Tables:
[legend]

## Public Member Functions
| add (string k, Table val)
| adds the given value to the hash with the given key name
| add (string k, AbstractTable val)
| adds the given value to the hash with the given key name
| add (Table val)
| adds the given value to the hash with the given key name
| add (AbstractTable val)
| adds the given value to the hash with the given key name
| constructor ()
| creates an empty object
| constructor (AbstractDatasource ds, hash tables, *hash opt)
| creates and populates the object from a hash description
| constructor (AbstractDatasource ds)
| creates and populates the object from tables in the database
Qore::AbstractIterator | dropIterator ()
| returns an iterator for a list of cached table names in the order that can be used to drop the tables, taking into account foreign constraint dependencies More...
AbstractTable | get (AbstractDatasource ds, string name)
| gets a table from the database or from the cache if already cached
*list | getDropAllForeignConstraintsOnTableSql (string name, *hash opt)
| returns a list of SQL strings that can be used to drop all the foreign constraints on a particular table More...
*string | getDropConstraintIfExistsSql (string tname, string cname, *hash opts)
| returns an SQL string that can be used to drop an existing constraint on a table, if the table is not already cached or the constraint does not exist, then NOTHING is returned More...
list | getDropList ()
| returns a list of cached table names in the order that can be used to drop the tables, taking into account foreign constraint dependencies More...
string | getElementName ()
| returns `"table"` since this object stores AbstractTable objects
*AbstractTable | getIfExists (AbstractDatasource ds, string name)
| gets a table from the database or from the cache if already cached; if the table does not exist, then NOTHING is returned
*string | getRenameTableIfExistsSql (string old_name, string new_name, *hash opts)
| returns an SQL string that can be used to rename the given table if it exists and the target does not exist, otherwise returns NOTHING More...
AbstractTable | memberGate (string k)
| returns the AbstractTable object corresponding to the key given or throws a KEY-ERROR exception More...
| populate (AbstractDatasource ds, hash tables, *hash opt)
| populates the object from a hash description
| populate (AbstractDatasource ds)
| populates the object from tables in the database
bool | tableRenamed (string old_name, string new_name, string old_sql_name)
| updates table names and internal references for renamed tables More...
AbstractTable | take (string k)
| removes the given key from the contained hash and returns the value
Public Member Functions inherited from SqlUtil::AbstractHashContainer
| clear ()
| purges the contained data More...
| constructor (*hash nh)
| creates the object with the hash argument passed
| copy (AbstractHashContainer old)
| creates a "deep copy" of the object
bool | empty ()
| returns True if the container is empty, False if not
*string | firstKey ()
| Returns the first key name in the contained hash or NOTHING if the contained hash has no keys. More...
*hash | getHash ()
| returns the hash contained by this object
bool | hasKey (string k)
| Returns True if the key exists in the contained hash (may or may not be assigned a value), False if not. More...
bool | hasKeyValue (string k)
| Returns True if the key exists in the contained hash and is assigned a value, False if not. More...
Qore::AbstractIterator | iterator ()
| Returns a HashIterator object for the contained hash. More...
Qore::AbstractIterator | keyIterator ()
| Returns a HashKeyIterator object for the contained hash. More...
list | keys ()
| Returns a list of key names of the contained hash. More...
*string | lastKey ()
| Returns the last key name in the contained hash or NOTHING if the contained hash has no keys. More...
bool | matchKeys (hash h1)
| returns True if the hash argument has the same keys (in any order), False if not More...
bool | matchKeys (list l)
| returns True if the list argument has the same list of key strings as the keys in the object (in any order), False if not More...
bool | matchKeys (AbstractHashContainer c)
| returns True if the container argument has the same keys (in any order), False if not More...
any | memberGate (string k)
| returns the value of the given key in the contained hash if it exists, otherwise throws a `KEY-ERROR` exception More...
Qore::AbstractIterator | pairIterator ()
| Returns a HashPairIterator object for the contained hash. More...
bool | partialMatchKeys (hash h1)
| returns True if the hash argument has at least the same keys (in any order, can have more keys), False if not More...
bool | partialMatchKeys (list l)
| returns True if the list argument has at least the same keys (in any order, can have more keys), False if not More...
bool | partialMatchKeys (AbstractHashContainer c)
| returns True if the container argument has at least the same keys (in any order, can have more keys), False if not More...
| renameKey (string old_name, string new_name)
| renames the given key; maintains the key order
int | size ()
| Returns the number of keys in the contained hash. More...
bool | val ()
| Returns False if the contained hash has no keys, True if it does. More...
list | values ()
| Returns a list of values of the contained hash. More...

## Detailed Description

the table container class stores a collection of tables in a schema

## Member Function Documentation

Qore::AbstractIterator SqlUtil::Tables::dropIterator | ( |  | ) |

returns an iterator for a list of cached table names in the order that can be used to drop the tables, taking into account foreign constraint dependencies

Example:
  map $1.drop(), $tables.getDropIterator();

Returns
  an iterator for a list of cached table names in the order that can be used to drop the tables, taking into account foreign constraint dependencies

*list SqlUtil::Tables::getDropAllForeignConstraintsOnTableSql | ( | string | name,
|  | *hash | opt
| ) |  |

returns a list of SQL strings that can be used to drop all the foreign constraints on a particular table

Example:
  my *list $l = $tables.getDropAllForeignConstraintsOnTableSql($name);

Make sure that all relevant tables are cached before calling this method; if the table is not cached, then NOTHING is returned

Parameters

  name | the name of the table to find all the foreigjn constraints for
  opt | a hash of options for the SQL strings; see AbstractDatabase::DropSchemaOptions for common options; each driver can support additional driver-specific options

Returns
  a list of SQL strings that can be used to drop all the foreign constraints on a particular table

Exceptions

  OPTION-ERROR | invalid or unsupported option passed

*string SqlUtil::Tables::getDropConstraintIfExistsSql | ( | string | tname,
|  | string | cname,
|  | *hash | opts
| ) |  |

returns an SQL string that can be used to drop an existing constraint on a table, if the table is not already cached or the constraint does not exist, then NOTHING is returned

Example:
  my *string $sql = $tables.getDropConstraintIfExistsSql("table", "pk_table");

If the sql_callback_executed option key is True and if the constraint to be dropped is a foreign constraint, then if any unique constraint is linked to this foreign constraint, the link is removed (see SQL CallBack Executed Flag for more information).

Parameters

  tname | the name of the table
  cname | the name of the constraint to drop if it exists
  opts | optional callback options; see AbstractDatabase::CallbackOptions for more info

Returns
  an SQL string that can be used to drop an existing constraint on a table, if the table is not already cached or the constraint does not exist, then NOTHING is returned

list SqlUtil::Tables::getDropList | ( |  | ) |

returns a list of cached table names in the order that can be used to drop the tables, taking into account foreign constraint dependencies

Example:
  my list $l = $tables.getDropList();
  map $1.drop(), $l;

Returns
  a list of cached table names in the order that can be used to drop the tables, taking into account foreign constraint dependencies

*string SqlUtil::Tables::getRenameTableIfExistsSql | ( | string | old_name,
|  | string | new_name,
|  | *hash | opts
| ) |  |

returns an SQL string that can be used to rename the given table if it exists and the target does not exist, otherwise returns NOTHING

Example:
  my *string $sql = $tables.getRenameTableIfExistsSql($old_name, $new_name);

If the sql_callback_executed option key is True, this method also takes care of renaming internal foreign constraint references and source constraint references from unique keys for the renamed table (see SQL CallBack Executed Flag for more information).

Parameters

  old_name | the current name of the table
  new_name | the new name of the table
  opts | optional callback options; see AbstractDatabase::CallbackOptions for more info

Returns
  an SQL string that can be used to rename the given table if it exists and the target does not exist, otherwise returns NOTHING

AbstractTable SqlUtil::Tables::memberGate | ( | string | k | ) |

returns the AbstractTable object corresponding to the key given or throws a KEY-ERROR exception

Example:
  my AbstractTable $t = $tables.table_name;

Parameters

  k | the name of the key to access

Returns
  the value of the given key in the contained hash if it exists

Exceptions

  KEY-ERROR | the given key does not exist in the contained hash

Note
  this method is called automatically when an unknown or inaccessible member name is accessed from outside the class

See Also
  memberGate_methods

bool SqlUtil::Tables::tableRenamed | ( | string | old_name,
|  | string | new_name,
|  | string | old_sql_name
| ) |  |

updates table names and internal references for renamed tables

Example:
  $tables.tableRenamed($old, $new);

Parameters

  old_name | the current name of the table
  new_name | the new name of the table
  old_sql_name | the old full SQL name of the table (ie the value returned by SqlUtil::AbstractTable::getSqlName())

Returns
  True if the table was renamed internally, False if not