DBSchema::Table(3pm)

User Contributed Perl Documentation

DBSchema::Table(3pm)

NAME¶

DBIx::DBSchema::Table - Table objects

SYNOPSIS¶

  use DBIx::DBSchema::Table;
  #new style (preferred), pass a hashref of parameters
  $table = new DBIx::DBSchema::Table (
    {
      name         => "table_name",
      primary_key  => "primary_key",
      columns      => \@dbix_dbschema_column_objects,
      #deprecated# unique      => $dbix_dbschema_colgroup_unique_object,
      #deprecated# 'index'     => $dbix_dbschema_colgroup_index_object,
      indices      => \@dbix_dbschema_index_objects,
      foreign_keys => \@dbix_dbschema_foreign_key_objects,
    }
  );
  #old style (VERY deprecated)
  $table = new DBIx::DBSchema::Table (
    "table_name",
    "primary_key",
    $dbix_dbschema_colgroup_unique_object,
    $dbix_dbschema_colgroup_index_object,
    @dbix_dbschema_column_objects,
  );
  $table->addcolumn ( $dbix_dbschema_column_object );
  $table_name = $table->name;
  $table->name("table_name");
  $primary_key = $table->primary_key;
  $table->primary_key("primary_key");
  #deprecated# $dbix_dbschema_colgroup_unique_object = $table->unique;
  #deprecated# $table->unique( $dbix_dbschema__colgroup_unique_object );
  #deprecated# $dbix_dbschema_colgroup_index_object = $table->index;
  #deprecated# $table->index( $dbix_dbschema_colgroup_index_object );
  %indices = $table->indices;
  $dbix_dbschema_index_object = $indices{'index_name'};
  @all_index_names = keys %indices;
  @all_dbix_dbschema_index_objects = values %indices;
  @column_names = $table->columns;
  $dbix_dbschema_column_object = $table->column("column");
  #preferred
  @sql_statements = $table->sql_create_table( $dbh );
  @sql_statements = $table->sql_create_table( $datasrc, $username, $password );
  #possible problems
  @sql_statements = $table->sql_create_table( $datasrc );
  @sql_statements = $table->sql_create_table;

DESCRIPTION¶

DBIx::DBSchema::Table objects represent a single database table.

METHODS¶

new HASHREF

Creates a new DBIx::DBSchema::Table object. The preferred usage is to pass a hash reference of named parameters.

  {
    name          => TABLE_NAME,
    primary_key   => PRIMARY_KEY,
    columns       => COLUMNS,
    indices       => INDICES,
    local_options => OPTIONS,
  }

TABLE_NAME is the name of the table.

PRIMARY_KEY is the primary key (may be empty).

COLUMNS is a reference to an array of DBIx::DBSchema::Column objects (see DBIx::DBSchema::Column).

INDICES is a reference to an array of DBIx::DBSchema::Index objects (see DBIx::DBSchema::Index), or a hash reference of index names (keys) and DBIx::DBSchema::Index objects (values).

FOREIGN_KEYS is a references to an array of DBIx::DBSchema::ForeignKey objects (see DBIx::DBSchema::ForeignKey).

OPTIONS is a scalar of database-specific table options, such as "WITHOUT OIDS" for Pg or "TYPE=InnoDB" for mysql.

new_odbc DATABASE_HANDLE TABLE_NAME: Creates a new DBIx::DBSchema::Table object from the supplied DBI database handle for the specified table. This uses the experimental DBI type_info method to create a table with standard (ODBC) SQL column types that most closely correspond to any non-portable column types. Use this to import a schema that you wish to use with many different database engines. Although primary key and (unique) index information will only be imported from databases with DBIx::DBSchema::DBD drivers (currently MySQL and PostgreSQL), import of column names and attributes *should* work for any database.
Note: the _odbc refers to the column types used and nothing else - you do not have to have ODBC installed or connect to the database via ODBC.

new_native DATABASE_HANDLE TABLE_NAME: Creates a new DBIx::DBSchema::Table object from the supplied DBI database handle for the specified table. This uses database-native methods to read the schema, and will preserve any non-portable column types. The method is only available if there is a DBIx::DBSchema::DBD for the corresponding database engine (currently, MySQL and PostgreSQL).

addcolumn COLUMN: Adds this DBIx::DBSchema::Column object.

delcolumn COLUMN_NAME: Deletes this column. Returns false if no column of this name was found to remove, true otherwise.

name [ TABLE_NAME ]: Returns or sets the table name.

local_options [ OPTIONS ]: Returns or sets the database-specific table options string.

primary_key [ PRIMARY_KEY ]: Returns or sets the primary key.

columns: Returns a list consisting of the names of all columns.

column COLUMN_NAME: Returns the column object (see DBIx::DBSchema::Column) for the specified COLUMN_NAME.

indices: Returns a list of key-value pairs suitable for assigning to a hash. Keys are index names, and values are index objects (see DBIx::DBSchema::Index).

unique_singles: Meet exciting and unique singles using this method!
This method returns a list of column names that are indexed with their own, unique, non-compond (that's the "single" part) indices.

sql_create_table [ DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ] ]: Returns a list of SQL statments to create this table.
The data source can be specified by passing an open DBI database handle, or by passing the DBI data source name, username and password.
Although the username and password are optional, it is best to call this method with a database handle or data source including a valid username and password - a DBI connection will be opened and the quoting and type mapping will be more reliable.
If passed a DBI data source (or handle) such as `DBI:mysql:database', will use MySQL- or PostgreSQL-specific syntax. Non-standard syntax for other engines (if applicable) may also be supported in the future.

sql_add_constraints [ DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ] ]: Returns a list of SQL statments to add constraints (foreign keys) to this table.
The data source can be specified by passing an open DBI database handle, or by passing the DBI data source name, username and password.
Although the username and password are optional, it is best to call this method with a database handle or data source including a valid username and password - a DBI connection will be opened and the quoting and type mapping will be more reliable.
If passed a DBI data source (or handle) such as `DBI:mysql:database', will use MySQL- or PostgreSQL-specific syntax. Non-standard syntax for other engines (if applicable) may also be supported in the future.

sql_alter_table PROTOTYPE_TABLE, [ DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ] ]: Returns a list of SQL statements to alter this table so that it is identical to the provided table, also a DBIx::DBSchema::Table object.
The data source can be specified by passing an open DBI database handle, or by passing the DBI data source name, username and password.
Although the username and password are optional, it is best to call this method with a database handle or data source including a valid username and password - a DBI connection will be opened and used to check the database version as well as for more reliable quoting and type mapping. Note that the database connection will be used passively, not to actually run the CREATE statements.
If passed a DBI data source (or handle) such as `DBI:mysql:database' or `DBI:Pg:dbname=database', will use syntax specific to that database engine. Currently supported databases are MySQL and PostgreSQL.
If not passed a data source (or handle), or if there is no driver for the specified database, will attempt to use generic SQL syntax.

sql_alter_constraints PROTOTYPE_TABLE, [ DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ] ]: Returns a list of SQL statements to alter this table's constraints (foreign keys) so that they are identical to the provided table, also a DBIx::DBSchema::Table object.
The data source can be specified by passing an open DBI database handle, or by passing the DBI data source name, username and password.
Although the username and password are optional, it is best to call this method with a database handle or data source including a valid username and password - a DBI connection will be opened and used to check the database version as well as for more reliable quoting and type mapping. Note that the database connection will be used passively, not to actually run the CREATE statements.
If passed a DBI data source (or handle) such as `DBI:mysql:database' or `DBI:Pg:dbname=database', will use syntax specific to that database engine. Currently supported databases are MySQL and PostgreSQL.
If not passed a data source (or handle), or if there is no driver for the specified database, will attempt to use generic SQL syntax.

foreign_keys_sql

foreign_keys: Returns a list of foreign keys (DBIx::DBSchema::ForeignKey objects).

AUTHOR¶

Ivan Kohler <ivan-dbix-dbschema@420.am>

Thanks to Mark Ethan Trostler <mark@zzo.com> for a patch to allow tables with no indices.

COPYRIGHT¶

Copyright (c) 2000-2007 Ivan Kohler Copyright (c) 2000 Mail Abuse Prevention System LLC Copyright (c) 2007-2013 Freeside Internet Services, Inc. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

BUGS¶

sql_create_table() has database-specific foo that probably ought to be abstracted into the DBIx::DBSchema::DBD:: modules (or no? it doesn't anymore?).

sql_alter_table() also has database-specific foo that ought to be abstracted into the DBIx::DBSchema::DBD:: modules.

sql_create_table() may change or destroy the object's data. If you need to use the object after sql_create_table, make a copy beforehand.

Some of the logic in new_odbc might be better abstracted into Column.pm etc.

Add methods to get and set specific indices, by name? (like column COLUMN_NAME)

indices method should be a setter, not just a getter?

Source file:	DBIx::DBSchema::Table.3pm.en.gz (from libdbix-dbschema-perl 0.44-1)
Source last updated:	2013-12-21T22:03:44Z
Converted to HTML:	2018-08-09T23:16:07Z