org.mmbase.storage.implementation.database
Class Attributes

java.lang.Object
  org.mmbase.storage.implementation.database.Attributes

public final class Attributes

extends java.lang.Object

This class defines the attributes names used by the default database storage manager classes. Specific storage managers may ignore or add their own attributes.

Since:

MMBase-1.7

Version:

$Id: Attributes.java,v 1.12 2004/03/23 14:06:21 rob Exp $

Author:

Pierre van Rooden

Field Summary

static java.lang.String	BINARY_FILE_PATH Attribute: database-binary-file-path.
static java.lang.String	DATA_SOURCE Attribute: database-data-source.
static java.lang.String	FORCE_ENCODE_TEXT Option: database-force-encode-text.
static java.lang.String	REMOVE_EMPTY_DEFINITIONS Option: database-remove-empty-definitions.
static java.lang.String	SEQUENCE_BUFFER_SIZE Option: sequence-buffer-size.
static java.lang.String	STORES_BINARY_AS_FILE Option: database-stores-binary-as-file.
static java.lang.String	SUPPORTS_BLOB Option: database-supports-blob.
static java.lang.String	SUPPORTS_COMPOSITE_INDEX Option: database-supports-composite-index.
static java.lang.String	SUPPORTS_DATA_DEFINITION Option: database-supports-data-definition.
static java.lang.String	SUPPORTS_TRANSACTIONS Option: database-supports-transactions.
static java.lang.String	TRANSACTION_ISOLATION_LEVEL Attribute: database-transaction-isolation-level.
static java.lang.String	TRIM_STRINGS Option: trim-strings.

Constructor Summary

Attributes()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DATA_SOURCE

public static final java.lang.String DATA_SOURCE

Attribute: database-data-source. The data source object used by the storage layer. This attribute is set by the storagelayer and returns a javax.sql.DataSource object. You should not set or configure this attribute (but you can retrieve it).

See Also:

Constant Field Values

SUPPORTS_TRANSACTIONS

public static final java.lang.String SUPPORTS_TRANSACTIONS

Option: database-supports-transactions. When true, the database supports transactions. The default is determined form the database, but you can override it.

See Also:

Constant Field Values

STORES_BINARY_AS_FILE

public static final java.lang.String STORES_BINARY_AS_FILE

Option: database-stores-binary-as-file. When true, binary data is stored on disk, rather than in the database. If you set this option ou should also set the attribute BINARY_FILE_PATH The default is false

See Also:

Constant Field Values

BINARY_FILE_PATH

public static final java.lang.String BINARY_FILE_PATH

Attribute: database-binary-file-path. The path to the directyory where binary files are to be stored if STORES_BINARY_AS_FILE is true. The default is the WEB-INF/data directory of the mmbase web application. Note that if you specify a relative url, it is taken from the web application's webroot.

See Also:

Constant Field Values

FORCE_ENCODE_TEXT

public static final java.lang.String FORCE_ENCODE_TEXT

Option: database-force-encode-text. If true, the database layer will explicitly decode/encode strings using the MMBase encoding when storing and retrieving text from the database. The default is false

See Also:

Constant Field Values

SUPPORTS_BLOB

public static final java.lang.String SUPPORTS_BLOB

Option: database-supports-blob. When true, the driver/database used supports the JDBC getBlob() method. The default is false

See Also:

Constant Field Values

SUPPORTS_COMPOSITE_INDEX

public static final java.lang.String SUPPORTS_COMPOSITE_INDEX

Option: database-supports-composite-index. When true, the database uses composite indices for 'key' fields. When false, it uses single indices (a separate index for each field) The default is true

See Also:

Constant Field Values

TRANSACTION_ISOLATION_LEVEL

public static final java.lang.String TRANSACTION_ISOLATION_LEVEL

Attribute: database-transaction-isolation-level. The transaction isolation level used for connections to the database. This determines the level of transaction support. The default is determined from the database metadata.

See Also:

Constant Field Values

SUPPORTS_DATA_DEFINITION

public static final java.lang.String SUPPORTS_DATA_DEFINITION

Option: database-supports-data-definition. If true, the data definiton (table structure) can be changed using ALTER TABLE statements. Some databses (such as Informix) may have trouble with ALTER TABLE statements on OO-tables. Turn this option false for tehse databses. The default is true

See Also:

Constant Field Values

REMOVE_EMPTY_DEFINITIONS

public static final java.lang.String REMOVE_EMPTY_DEFINITIONS

Option: database-remove-empty-definitions. If this option is true, empty parenthesis in a table definition are removed. When you create a new table that extends form another table, but which doesn't add fields, you may get a statement that looks like:
CREATE TABLE table1 () UNDER table2
This statement will fail udner a database such as Informix, which does not accept empty parenthesis, but instead expects:
CREATE TABLE table1 UNDER table2
On the other hand, a database such as Postgresql DOES expect the parenthesis (and fails if they are ommitted.) The default is false

See Also:

Constant Field Values

SEQUENCE_BUFFER_SIZE

public static final java.lang.String SEQUENCE_BUFFER_SIZE

Option: sequence-buffer-size. The sequence buffer size is the number of keys that MMBase caches in the storage layer. You can use this to minimize the nr of times MMBase accesses the database to generate a new object number. When not set, the value is assumed to be 1.

See Also:

Constant Field Values

TRIM_STRINGS

public static final java.lang.String TRIM_STRINGS

Option: trim-strings. Some text fields for some databases need to be trimmed. The default is false

See Also:

Constant Field Values

Constructor Detail

Attributes

public Attributes()