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
is_sufficient_field_type ( $required, $actual )

Overridable, only for SQL driver. Checks if database field type is sufficient.

Parameters:
- $required
  
  Required field type.
- $actual
  
  Actual field type.
Returns:

The true value if actual field type is appropriate AND size is equal to or greater than required size.

This method was added on Sympa 6.2.67b.1.
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:

begin ( )

Overridable, only for SQL driver.
commit ( )

Overridable, only for SQL driver.
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.
rollback ( )

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.

HISTORY

Sympa Database Manager (SDM) appeared on Sympa 6.2.

Documentation for Sympa