EOSchemaSynchronization (WebObjects 5.4.2 Reference)

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com.webobjects.eoaccess.synchronization
Interface EOSchemaSynchronization

All Known Subinterfaces:: EOSchemaSynchronization

All Known Implementing Classes:: DerbyPlugIn.DerbySynchronizationFactory, EOSchemaSynchronizationFactory, EOSynchronizationFactory, FrontbasePlugIn.FrontbaseSynchronizationFactory, MerantPlugIn.MerantSynchronizationFactory, MicrosoftPlugIn.MicrosoftSynchronizationFactory, MySQLPlugIn.MySQLSynchronizationFactory, OpenBasePlugIn.OpenBaseSynchronizationFactory, OraclePlugIn.OracleSynchronizationFactory, SybasePlugIn.SybaseSynchronizationFactory

public interface EOSchemaSynchronization

This interface has been introduced to define API to synchronize a database schema with a corresponding EOModel. None of the API is new in WebObjects 5.x. Rather, it was moved to EOSchemaSynchronization from EOSQLExpression. The API is essentially the same as in WebObjects 4.5.x except that methods which were formerly static methods of EOSQLExpression in WebObjects 4.5.x are now are instance methods of EOSchemaSynchronization.

An implementation of the EOSchemaSynchronization interface is provided by EOSynchronizationFactory, a new class introduced in WebObjects 5.0.

EOSchemaSynchronization defines a number of constants for use as keys in change dictionaries or options dictionaries. A change dictionary contains information about tables to insert, tables to delete, tables to update, and information about how to update them.

The schema synchronization API is typically used only by the EOModeler application, not by user application code.

Since:: 5.4
See Also:: EOSQLExpression, EOSchemaGeneration, EOSchemaSynchronizationFactory

Nested Class Summary
`static interface`	`EOSchemaSynchronization.ColumnTypes` The ColumnTypes interface is only used when implementing schema synchronization API for a custom adaptor.

Method Summary
`EOSchemaColumnDescription`	`columnDescriptionForTableAndModel(String columnName, String tableName, EOModel model)` Return a Column Description object that describe the database schema.
`EOSchemaIndexDescription`	`indexDescriptionForTableAndModel(String indexName, String tableName, EOModel model)` Return an Index Description object that describe the database schema.
`boolean`	`isColumnTypeEquivalentToColumnType(EOSchemaSynchronization.ColumnTypes candidate, EOSchemaSynchronization.ColumnTypes columnType, EOSchemaGenerationOptions options)` Returns `true` if the name, precision, width, and scale of `candidate` are identical to the name, precision, width, and scale of `columnType`, `false` otherwise.
`EOSchemaSynchronizationModelChanges`	`newChanges()` Creates a new Changes object, to facilitate subclassing.
`EOSchemaGenerationOptions`	`newOptions()` Creates a new Options object, to facilitate subclassing.
`EOSchemaSynchronizationColumnChanges`	`objectStoreChangesFromAttributeToAttribute(EOAttribute schemaAttribute, EOAttribute modelAttribute)` Compares `schemaAttribute` with `modelAttribute` and returns a change dictionary of state that is different between the the two.
`String`	`phraseCastingColumnNamed(String columnName, EOSchemaSynchronization.ColumnTypes type, EOSchemaSynchronization.ColumnTypes castType, EOSchemaGenerationOptions options)` Returns an SQL string to cast the values in the column identified by `columnName` from the current `type` to a new type specified by `castType`.
`NSArray`	`statementsToConvertColumnType(String columnName, String tableName, EOSchemaSynchronization.ColumnTypes type, EOSchemaSynchronization.ColumnTypes newType, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to convert in place of the type of the column indentifed by `columnName` in the table identified by `tableName` from the current `type` to the type specified by `newType`.
`NSArray`	`statementsToCopyTableNamed(String tableName, NSArray entityGroup, EOSchemaSynchronizationTableChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to copy the specified table into a new table, whose definition is provided by `entityGroup`, an array of EOEntity objects with the same external name.
`NSArray`	`statementsToDeleteColumnNamed(String columnName, String tableName, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to delete the column indentifed by `columnName` from the table identified by `tableName`.
`NSArray`	`statementsToDropForeignKeyConstraintsOnEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to drop foreign key constraints for the table corresponding to `entityGroups`, which is an array containing arrays of EOEntity objects with the same external name.
`NSArray`	`statementsToDropPrimaryKeyConstraintsOnEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to drop primary key constraints for the table corresponding to `entityGroups`, which is an array containing arrays of EOEntity objects with the same external name.
`NSArray`	`statementsToDropPrimaryKeySupportForEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to drop primary key support for the table corresponding to `entityGroups`, which is an array containing arrays of EOEntity objects with the same external name.
`NSArray`	`statementsToImplementForeignKeyConstraintsOnEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to implement foreign key constraints for the table corresponding to `entityGroups`, which is an array containing arrays of EOEntity objects with the same external name.
`NSArray`	`statementsToImplementPrimaryKeyConstraintsOnEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to implement primary key constraints for the table corresponding to `entityGroups`, which is an array containing arrays of EOEntity objects with the same external name.
`NSArray`	`statementsToImplementPrimaryKeySupportForEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to implement primary key support for the table corresponding to `entityGroups`, which is an array containing arrays of EOEntity objects with the same external name.
`NSArray`	`statementsToInsertColumnForAttribute(EOAttribute attribute, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to insert a column in the database schema for the specified `attribute`.
`NSArray`	`statementsToModifyColumnNullRule(String columnName, String tableName, boolean allowsNull, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to modify in place the column identified by `columnName` in the table identified by `tableName` to either allow or not allow NULL values as specified by `allowsNull`.
`NSArray`	`statementsToRenameColumnNamed(String columnName, String tableName, String newName, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to rename in place of the the column indentifed by in the table identified by `tableName` to `newName`.
`NSArray`	`statementsToRenameTableNamed(String tableName, String newName, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to rename in place the the table indentifed by `tableName` to `newName`.
`NSArray`	`statementsToUpdateObjectStoreForEntityGroups(NSArray entityGroups, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to update the database table that corresponds to `model` according to the changes and SQL generation instructions in the `changes` and `options` dictionaries.
`NSArray`	`statementsToUpdateObjectStoreForModel(EOModel model, EOSchemaSynchronizationModelChanges changes, EOSchemaGenerationOptions options)` Returns an array of EOSQLExpressions to synchronize the database with the EOModel `model`.
`boolean`	`supportsDirectColumnCoercion()` Returns `true` if the adaptor can change the type of an existing column in place, `false` otherwise.
`boolean`	`supportsDirectColumnDeletion()` Returns `true` if the adaptor can delete columns, `false` otherwise.
`boolean`	`supportsDirectColumnInsertion()` Returns `true` if the adaptor can add columns to a table, `false` otherwise.
`boolean`	`supportsDirectColumnNullRuleModification()` Returns `true` if the adaptor can modify the `null` rule of an existing column in place, `false` otherwise.
`boolean`	`supportsDirectColumnRenaming()` Returns `true` if the adaptor can rename table columns, `false` otherwise.
`boolean`	`supportsSchemaSynchronization()` Returns `true` if the adaptor can update the database schema to reflect changes in an EOModel, `false` otherwise.
`boolean`	`supportsTableDescriptionIntrospection()` Returns `true` if the adaptor can describe the database schema, `false` otherwise.
`EOSchemaTableDescription`	`tableDescriptionForModel(String tableName, EOModel model)` Return a Table Description object that describe the database schema.

Method Detail

newOptions

EOSchemaGenerationOptions newOptions()

Creates a new Options object, to facilitate subclassing.

Returns:: Options object

newChanges

EOSchemaSynchronizationModelChanges newChanges()

Creates a new Changes object, to facilitate subclassing.

Returns:: Changes object

isColumnTypeEquivalentToColumnType

boolean isColumnTypeEquivalentToColumnType(EOSchemaSynchronization.ColumnTypes candidate,
                                           EOSchemaSynchronization.ColumnTypes columnType,
                                           EOSchemaGenerationOptions options)

Returns true if the name, precision, width, and scale of candidate are identical to the name, precision, width, and scale of columnType, false otherwise. If the columns are equivalent, the candidate column can be copied to columnType without casting.

Parameters:: candidate - A column to potentially copy.; columnType - A column into which to copy candidate.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: true if the specified attributes of candidate are identical to the corresponding attributes of columnType.

phraseCastingColumnNamed

String phraseCastingColumnNamed(String columnName,
                                EOSchemaSynchronization.ColumnTypes type,
                                EOSchemaSynchronization.ColumnTypes castType,
                                EOSchemaGenerationOptions options)

Returns an SQL string to cast the values in the column identified by columnName from the current type to a new type specified by castType. This method is used when the adaptor doesn't support in-place column type coercion, and the table has to be recreated. To move data from the old table to the new table, sometimes a conversion statement is needed (for example, to convert strings in a VARCHAR column to numbers). options is a dictionary describing the aspects of the schema for which to create SQL statements.

Parameters:: columnName - The name of a database column.; type - The type of the values in the specified column.; castType - The new type to which to cast the values in the specified column.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An SQL string to cast the values in the specified column to castType

statementsToCopyTableNamed

NSArray statementsToCopyTableNamed(String tableName,
                                   NSArray entityGroup,
                                   EOSchemaSynchronizationTableChanges changes,
                                   EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to copy the specified table into a new table, whose definition is provided by entityGroup, an array of EOEntity objects with the same external name. This method is used when the adaptor doesn't support the in-place table modifications required to synchronize the database to a model.

The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: tableName - The name of the table to be copied.; entityGroup - An array of EOEntity objects that defines a new database table into which to copy the named table.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to copy the table named tableName to a new table defined by entityGroup.
See Also:: EOSchemaSynchronization

statementsToInsertColumnForAttribute

NSArray statementsToInsertColumnForAttribute(EOAttribute attribute,
                                             EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to insert a column in the database schema for the specified attribute. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: attribute - An EOAttribute for which to insert a database column.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to insert the column for attribute.
See Also:: EOAttribute, EOSchemaSynchronization

statementsToModifyColumnNullRule

NSArray statementsToModifyColumnNullRule(String columnName,
                                         String tableName,
                                         boolean allowsNull,
                                         EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to modify in place the column identified by columnName in the table identified by tableName to either allow or not allow NULL values as specified by allowsNull. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: columnName - The name of a column to be modified.; tableName - The name of the table containing the specified column.; allowsNull - A boolean value to determine whether to allow or not allow NULL values in the specified column.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to modify the specified column to allow or disallow NULL values.
See Also:: EOSchemaSynchronization

statementsToConvertColumnType

NSArray statementsToConvertColumnType(String columnName,
                                      String tableName,
                                      EOSchemaSynchronization.ColumnTypes type,
                                      EOSchemaSynchronization.ColumnTypes newType,
                                      EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to convert in place of the type of the column indentifed by columnName in the table identified by tableName from the current type to the type specified by newType. options is a dictionary describing the aspects of the schema for which to create SQL statements.

Parameters:: columnName - The name of a column to be modified.; tableName - The name of the table containing the specified column.; type - The current type of the specified column.; newType - The type to which to convert the specified column.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to convert in place the type of the specified column.

statementsToDeleteColumnNamed

NSArray statementsToDeleteColumnNamed(String columnName,
                                      String tableName,
                                      EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to delete the column indentifed by columnName from the table identified by tableName. options is a dictionary describing the aspects of the schema for which to create SQL statements.

Parameters:: columnName - The name of a column to be deleted.; tableName - The name of the table containing the specified column.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to delete the specified column.

statementsToRenameColumnNamed

NSArray statementsToRenameColumnNamed(String columnName,
                                      String tableName,
                                      String newName,
                                      EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to rename in place of the the column indentifed by in the table identified by tableName to newName. options is a dictionary describing the aspects of the schema for which to create SQL statements.

Parameters:: columnName - The name of a column to be renamed.; tableName - The name of the table containing the specified column.; newName - The new name for the specified column.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to rename in place the specified column.

statementsToDropForeignKeyConstraintsOnEntityGroups

NSArray statementsToDropForeignKeyConstraintsOnEntityGroups(NSArray entityGroups,
                                                            EOSchemaSynchronizationModelChanges changes,
                                                            EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to drop foreign key constraints for the table corresponding to entityGroups, which is an array containing arrays of EOEntity objects with the same external name. The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: entityGroups - An array containing arrays of EOEntity objects with the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to drop foreign key constraints for the table corresponding to entityGroups.
See Also:: EOSchemaSynchronization

statementsToDropPrimaryKeyConstraintsOnEntityGroups

NSArray statementsToDropPrimaryKeyConstraintsOnEntityGroups(NSArray entityGroups,
                                                            EOSchemaSynchronizationModelChanges changes,
                                                            EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to drop primary key constraints for the table corresponding to entityGroups, which is an array containing arrays of EOEntity objects with the same external name. The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: entityGroups - An array containing arrays of EOEntity objects with the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to drop primary key constraints for the table corresponding to entityGroups.
See Also:: EOSchemaSynchronization

statementsToDropPrimaryKeySupportForEntityGroups

NSArray statementsToDropPrimaryKeySupportForEntityGroups(NSArray entityGroups,
                                                         EOSchemaSynchronizationModelChanges changes,
                                                         EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to drop primary key support for the table corresponding to entityGroups, which is an array containing arrays of EOEntity objects with the same external name. The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: entityGroups - An array containing arrays of EOEntity objects with the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to drop primary key support for the table corresponding to entityGroups.
See Also:: EOSchemaSynchronization

statementsToImplementForeignKeyConstraintsOnEntityGroups

NSArray statementsToImplementForeignKeyConstraintsOnEntityGroups(NSArray entityGroups,
                                                                 EOSchemaSynchronizationModelChanges changes,
                                                                 EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to implement foreign key constraints for the table corresponding to entityGroups, which is an array containing arrays of EOEntity objects with the same external name. The changes dictionary identifies changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: entityGroups - An array containing arrays of EOEntity objects with the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to implement foreign key constraints for the table corresponding to entityGroups.
See Also:: EOSchemaSynchronization

statementsToImplementPrimaryKeyConstraintsOnEntityGroups

NSArray statementsToImplementPrimaryKeyConstraintsOnEntityGroups(NSArray entityGroups,
                                                                 EOSchemaSynchronizationModelChanges changes,
                                                                 EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to implement primary key constraints for the table corresponding to entityGroups, which is an array containing arrays of EOEntity objects with the same external name. The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: entityGroups - An array containing arrays of EOEntity objects with the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to implement primary key constraints for the table corresponding to entityGroups.
See Also:: EOSchemaSynchronization

statementsToImplementPrimaryKeySupportForEntityGroups

NSArray statementsToImplementPrimaryKeySupportForEntityGroups(NSArray entityGroups,
                                                              EOSchemaSynchronizationModelChanges changes,
                                                              EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to implement primary key support for the table corresponding to entityGroups, which is an array containing arrays of EOEntity objects with the same external name. The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: entityGroups - An array containing arrays of EOEntity objects with the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to implement primary key support for the table corresponding to entityGroups.
See Also:: EOSchemaSynchronization

statementsToRenameTableNamed

NSArray statementsToRenameTableNamed(String tableName,
                                     String newName,
                                     EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to rename in place the the table indentifed by tableName to newName. options is a dictionary describing the aspects of the schema for which to create SQL statements.

Parameters:: tableName - The name of a table to be renamed.; newName - The new name for the specified table.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to rename in place the specified table.

statementsToUpdateObjectStoreForModel

NSArray statementsToUpdateObjectStoreForModel(EOModel model,
                                              EOSchemaSynchronizationModelChanges changes,
                                              EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to synchronize the database with the EOModel model. Prepares the statements to insert and delete new and deleted tables before invoking statementsToUpdateObjectStoreForEntityGroups for each modified table. The changes dictionary identifies the changes to make to the database schema. The options dictionary describes the aspects of the schema for which to create SQL statements.

Parameters:: model - The EOModel with which to sychnronize the database.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to synchronize the database with model.
See Also:: #statementsToUpdateObjectStoreForEntityGroups( NSArray model, NSDictionary changes, EOSchemaGenerationOptions options), EOSchemaSynchronization

statementsToUpdateObjectStoreForEntityGroups

NSArray statementsToUpdateObjectStoreForEntityGroups(NSArray entityGroups,
                                                     EOSchemaSynchronizationModelChanges changes,
                                                     EOSchemaGenerationOptions options)

Returns an array of EOSQLExpressions to update the database table that corresponds to model according to the changes and SQL generation instructions in the changes and options dictionaries. model is an array of entity groups, which are arrays of EOEntity objects that have the same external name. Inserts and deletes columns, and updates modified columns.

Parameters:: entityGroups - An array of entity groups, which are arrays of EOEntity objects that have the same external name.; changes - A dictionary of changes to make to the database schema.; options - A dictionary describing the aspects of the schema for which to create SQL statements.
Returns:: An array of the EOSQLExpressions to update the database table corresponding to the entity groups in model.
See Also:: EOSchemaSynchronization

tableDescriptionForModel

EOSchemaTableDescription tableDescriptionForModel(String tableName,
                                                  EOModel model)

Return a Table Description object that describe the database schema.

Parameters:: tableName - table name to describe; model - model to introscpect
Returns:

columnDescriptionForTableAndModel

EOSchemaColumnDescription columnDescriptionForTableAndModel(String columnName,
                                                            String tableName,
                                                            EOModel model)

Return a Column Description object that describe the database schema.

Parameters:: columnName - column name to describe; tableName - table name to describe; model - model to introscpect
Returns:

indexDescriptionForTableAndModel

EOSchemaIndexDescription indexDescriptionForTableAndModel(String indexName,
                                                          String tableName,
                                                          EOModel model)

Return an Index Description object that describe the database schema.

Parameters:: indexName - index name to describe; tableName - table name to describe; model - model to introscpect
Returns:

supportsDirectColumnNullRuleModification

boolean supportsDirectColumnNullRuleModification()

Returns true if the adaptor can modify the null rule of an existing column in place, false otherwise.

Returns:: true if the adaptor can modify the nullrule of an existing column in place

supportsDirectColumnCoercion

boolean supportsDirectColumnCoercion()

Returns true if the adaptor can change the type of an existing column in place, false otherwise.

Returns:: true if the adaptor can change the type of an existing column in place.

supportsDirectColumnDeletion

boolean supportsDirectColumnDeletion()

Returns true if the adaptor can delete columns, false otherwise.

Returns:: true if the adaptor can delete columns.

supportsDirectColumnInsertion

boolean supportsDirectColumnInsertion()

Returns true if the adaptor can add columns to a table, false otherwise.

Returns:: true if the adaptor can add columns to a table.

supportsDirectColumnRenaming

boolean supportsDirectColumnRenaming()

Returns true if the adaptor can rename table columns, false otherwise.

Returns:: true if the adaptor can rename table columns.

supportsSchemaSynchronization

boolean supportsSchemaSynchronization()

Returns true if the adaptor can update the database schema to reflect changes in an EOModel, false otherwise.

Returns:: true if the adaptor can update the database schema.

supportsTableDescriptionIntrospection

boolean supportsTableDescriptionIntrospection()

Returns true if the adaptor can describe the database schema, false otherwise.

Returns:: true if the adaptor can describe the database schema.

objectStoreChangesFromAttributeToAttribute

EOSchemaSynchronizationColumnChanges objectStoreChangesFromAttributeToAttribute(EOAttribute schemaAttribute,
                                                                                EOAttribute modelAttribute)

Compares schemaAttribute with modelAttribute and returns a change dictionary of state that is different between the the two. The possible keys in the change dictionary are:

ExternalTypeKey
AllowsNullKey
PrecisionKey
ScaleKey
WidthKey

The values in the change dictionary are the corresponding values of schemaAttribute, that is, the values stored in the database.

Parameters:: schemaAttribute - An EOAttribute as represented in the database.; modelAttribute - An EOAttribute as represented in the EOModel.
Returns:: A change dictionary for the difference in state between schemaAttribute and modelAttribute.