net.java.ao.schema.helper

Interface DatabaseMetaDataReader

All Known Implementing Classes:

DatabaseMetaDataReaderImpl

public interface DatabaseMetaDataReader

Method Summary

Modifier and Type	Method and Description
Iterable<? extends Field>	getFields(DatabaseMetaData databaseMetaData, String tableName)
Iterable<? extends ForeignKey>	getForeignKeys(DatabaseMetaData databaseMetaData, String tableName) Gets the list of foreign keys for a given table
Iterable<? extends Index>	getIndexes(DatabaseMetaData databaseMetaData, String tableName) Gets the list of simple indexes for a given table.
Iterable<String>	getTableNames(DatabaseMetaData databaseMetaData) Gets the names of the existing tables in the DB
boolean	isTablePresent(DatabaseMetaData databaseMetaData, Class<? extends RawEntity<?>> type) Checks if the table corresponding to given type exists in the database.

Method Detail

isTablePresent

boolean isTablePresent(DatabaseMetaData databaseMetaData,
                       Class<? extends RawEntity<?>> type)

Checks if the table corresponding to given type exists in the database.

Parameters:

databaseMetaData - of the database to be checked

type - to check against

Returns:

true if the table exists, false otherwise

getTableNames

Iterable<String> getTableNames(DatabaseMetaData databaseMetaData)

Gets the names of the existing tables in the DB

Parameters:

databaseMetaData - the meta data from which to extract the table names

Returns:

an Iterable of table names as strings

getFields

Iterable<? extends Field> getFields(DatabaseMetaData databaseMetaData,
                                    String tableName)

Parameters:

databaseMetaData -

tableName -

Returns:

getForeignKeys

Iterable<? extends ForeignKey> getForeignKeys(DatabaseMetaData databaseMetaData,
                                              String tableName)

Gets the list of foreign keys for a given table

Parameters:

databaseMetaData - the database metadata to read the information from

tableName - the name of the table from which to read the foreign keys

Returns:

an Iterable of foreign keys

getIndexes

Iterable<? extends Index> getIndexes(DatabaseMetaData databaseMetaData,
                                     String tableName)

Gets the list of simple indexes for a given table. AO only supports single column indexes, and as such composite indexes will not be returned by this method even if they exist in the table. Prior to AO v1.1.4 this method returned fragments of composite indexes and it was then possible for the migration code to crash because it would try to delete the same index multiple times.

Parameters:

databaseMetaData - the database metadata to read the information from

tableName - the name of the table from which to read the indexes

Returns:

an Iterable of simple indexes