NAME

Sympa::DatabaseDriver - Base class of database drivers for Sympa

SYNOPSIS

package Sympa::DatabaseDriver::FOO;
use base qw(Sympa::DatabaseDriver);

DESCRIPTION

Sympa::DatabaseDriver is the base class of driver classes for Sympa Database Manager (SDM).

Instance methods subclasses should implement

• required_modules ( )

  Overridable. Returns an arrayref including package name(s) this driver requires. By default, no packages are required.

• required_parameters ( )

  Overridable. Returns an arrayref including names of required (not optional) parameters. By default, returns ['db_name', 'db_user'].

  Note: On Sympa prior to 6.2.37b.2, it by default returned ['db_host', 'db_name', 'db_user'].

• optional_modules ( )

  Overridable. Returns an arrayref including all name(s) of optional packages. By default, there are no optional packages.

  This method was introduced by Sympa 6.2.4.

• optional_parameters ( )

  Overridable. Returns an arrayref including all names of optional parameters. By default, returns 'db_passwd', 'db_port', 'db_options' and so on.

• build_connect_string ( )

  Mandatory for SQL driver. Builds the string to be used by the DBI to connect to the database.

  Parameter:

  None.

  Returns:

  String representing data source name (DSN).

• connect ( )

  Overridable. Connects to database calling “_connect”() and sets database handle.

  Parameter:

  None.

  Returns:

  True value or, if connection failed, false value.

• _connect ( )

  Overridable. Connects to database and returns native database handle.

  The default implementation is for DBI database handle.

• get_substring_clause ( { source_field => $source_field, separator => $separator, substring_length => $substring_length } )

  This method was deprecated by Sympa 6.2.4.

• get_limit_clause ( )

  This method was deprecated.

• get_formatted_date ( { mode => $mode, target => $target } )

  Deprecated as of Sympa 6.2.25b.3.

  Mandatory for SQL driver. Returns a character string corresponding to the expression to use in a query involving a date.

  Parameters:

  • $mode

    authorized values:

    • 'write'

      The sub returns the expression to use in ‘INSERT’ or ‘UPDATE’ queries.

    • 'read'

      The sub returns the expression to use in ‘SELECT’ queries.

  • $target

    The name of the field or the value to be used in the query.

  Returns:

  The formatted date or undef if the date format mode is unknown.

• is_autoinc ( { table => $table, field => $field } )

  Required to probe database structure. Checks whether a field is an auto-increment field or not.

  Parameters:

  • $field

    The name of the field to test

  • $table

    The name of the table to add

  Returns:

  True if the field is an auto-increment field, false otherwise

• set_autoinc ( { table => $table, field => $field } )

  Required to update database structure. Defines the field as an auto-increment field.

  Parameters:

  • $field

    The name of the field to set.

  • $table

    The name of the table to add.

  Returns:

  1 if the auto-increment could be set, undef otherwise.

• get_tables ( )

  Required to probe database structure. Returns the list of the tables in the database.

  Parameters:

  None.

  Returns:

  A ref to an array containing the list of the table names in the database, undef if something went wrong.

• add_table ( { table => $table } )

  Required to update database structure. Adds a table to the database.

  Parameter:

  • $table

    The name of the table to add

  Returns:

  A character string report of the operation done or undef if something went wrong.

• get_fields ( { table => $table } )

  Required to probe database structure. Returns a ref to an hash containing the description of the fields in a table from the database.

  Parameters:

  • $table

    The name of the table whose fields are requested.

  Returns:

  A hash in which the keys are the field names and the values are the field type.

  Returns undef if something went wrong.

• update_field ( { table => $table, field => $field, type => $type, … } )

  Required to update database structure. Changes the type of a field in a table from the database.

  Parameters:

  • $field

    The name of the field to update.

  • $table

    The name of the table whose fields will be updated.

  • $type

    The type of the field to add.

  • $notnull

    Specifies that the field must not be null

  Returns:

  A character string report of the operation done or undef if something went wrong.

• add_field ( { table => $table, field => $field, type => $type, … } )

  Required to update database structure. Adds a field in a table from the database.

  Parameters:

  • $field

    The name of the field to add.

  • $table

    The name of the table where the field will be added.

  • $type

    The type of the field to add.

  • $notnull

    Specifies that the field must not be null.

  • $autoinc

    Specifies that the field must be auto-incremental.

  • $primary

    Specifies that the field is a key.

  Returns:

  A character string report of the operation done or undef if something went wrong.

• delete_field ( { table => $table, field => $field } )

  Required to update database structure. Deletes a field from a table in the database.

  Parameters:

  • $field

    The name of the field to delete

  • $table

    The name of the table where the field will be deleted.

  Returns:

  A character string report of the operation done or undef if something went wrong.

• get_primary_key ( { table => $table } )

  Required to probe database structure. Returns the list fields being part of a table’s primary key.

  • $table

    The name of the table for which the primary keys are requested.

  Returns:

  A ref to a hash in which each key is the name of a primary key or undef if something went wrong.

• unset_primary_key ( { table => $table } )

  Required to update database structure. Drops the primary key of a table.

  Parameter:

  • $table

    The name of the table for which the primary keys must be dropped.

  Returns:

  A character string report of the operation done or undef if something went wrong.

• set_primary_key ( { table => $table, fields => $fields } )

  Required to update database structure. Sets the primary key of a table.

  Parameters:

  • $table

    The name of the table for which the primary keys must be defined.

  • $fields

    A ref to an array containing the names of the fields used in the key.

  Returns:

  A character string report of the operation done or undef if something went wrong.

• get_indexes ( { table => $table } )

  Required to probe database structure. Returns a ref to a hash in which each key is the name of an index.

  Parameter:

  • $table

    The name of the table for which the indexes are requested.

  Returns:

  A ref to a hash in which each key is the name of an index. These key point to a second level hash in which each key is the name of the field indexed. Returns undef if something went wrong.

• unset_index ( { table => $table, index => $index } )

  Required to update database structure. Drops an index of a table.

  Parameters:

  • $table

    The name of the table for which the index must be dropped.

  • $index

    The name of the index to be dropped.

  Returns:

  A character string report of the operation done or undef if something went wrong.

• set_index ( { table => $table, index_name => $index_name, fields => $fields } )

  Required to update database structure. Sets an index in a table.

  Parameters:

  • $table

    The name of the table for which the index must be defined.

  • $fields

    A ref to an array containing the names of the fields used in the index.

  • $index_name

    The name of the index to be defined.

  Returns:

  A character string report of the operation done or undef if something went wrong.

• translate_type ( $generic_type )

  Required to probe and update database structure. Get native field type corresponds to generic type. The generic type is based on MySQL: See “full_db_struct” in Sympa::DatabaseDescription.

Subclasses of Sympa::DatabaseDriver class also can override methods provided by Sympa::Database class:

• do_operation ( $operation, $parameters, …)

  Overridable, only for LDAP driver.

• do_query ( $query, $parameters, … )

  Overridable, only for SQL driver.

• do_prepared_query ( $query, $parameters, … )

  Overridable, only for SQL driver.

• AS_DOUBLE ( $value )

  Overridable. Helper functions to return the DOUBLE binding type and value used by “do_prepared_query”(). Overridden by inherited classes.

  Parameter:

  • $value

  Parameter value

  Returns:

  One of:

  • An array ( { sql_type => SQL_type }, value ).
  • Single value (i.e. an array with single item), if special treatment won’t be needed.
  • Empty array () if arguments were not given.

• AS_BLOB ( $value )

  Overridable. Helper functions to return the BLOB (binary large object) binding type and value used by “do_prepared_query”(). Overridden by inherited classes.

  See “AS_DOUBLE” for more details.

Utility method

• __dbh ( )

  Instance method, protected. Returns native database handle which _connect() returned. This may be used at inside of each driver class.

SEE ALSO

Sympa::Database, Sympa::DatabaseManager.

HISTORY

Sympa Database Manager (SDM) appeared on Sympa 6.2.

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