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API:EPrints/Database/mysql: Difference between revisions

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  -->{{Pod2Wiki}}{{API:Source|file=EPrints/Database/mysql.pm|package_name=EPrints::Database::mysql}}[[Category:API|mysql]]<!-- End of Pod2Wiki -->
  -->{{API}}{{Pod2Wiki}}{{API:Source|file=EPrints/Database/mysql.pm|package_name=EPrints::Database::mysql}}[[Category:API|MYSQL]][[Category:API:EPrints/Database|MYSQL]]<div><!-- Edit below this comment -->
<!-- Pod2Wiki=head_name -->=NAME=
 
 
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==NAME==
'''EPrints::Database::mysql''' - custom database methods for MySQL DB
'''EPrints::Database::mysql''' - custom database methods for MySQL DB


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==DESCRIPTION==
MySQL database wrapper.
MySQL database wrapper.


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Foreign keys will be defined if you use a DB engine that supports them  (e.g. InnoDB).
<!-- Pod2Wiki=head_mysql_specific_annoyances -->==MySQL-specific Annoyances==
 
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===Synopsis===
    $c-&gt;{dbdriver} = 'mysql';
    # $c-&gt;{dbhost} = 'localhost';
    # $c-&gt;{dbport} = '3316';
    $c-&gt;{dbname} = 'myrepo';
    $c-&gt;{dbuser} = 'bob';
    $c-&gt;{dbpass} = 'asecret';
    # $c-&gt;{dbengine} = 'InnoDB';
 
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===MySQL-specific Annoyances===
MySQL does not support sequences.
MySQL does not support sequences.


MySQL is (by default) lax about truncation.
MySQL is (by default) lax about truncation.


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<!-- Pod2Wiki=item_get_server_version -->==get_server_version==
 
 
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==CONSTANTS==
See [[API:EPrints/Database#CONSTANTS|EPrints::Database]].
 
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==INSTANCE VARIABLES==
See [[API:EPrints/Database#INSTANCE_VARIABLES|EPrints::Database]].
 
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==METHODS==
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===get_server_version===
 
$version = $db-&gt;get_server_version
Returns the database server version.
 
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===mysql_version_from_dbh===
 
$version = $db-&gt;mysql_version_from_dbh
Returns the MySQL database server version from handle <tt>$dbh</tt>.
 
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===create===
 
$version = $db-&gt;create( $username, $password )
Creates EPrints database as user with <tt>$username</tt> and <tt>$password</tt>.
 
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===create_counters===
 
$n = $db-&gt;create_counters()
Creates and initialises the counters.
 
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===has_table===
 
$boolean = $db-&gt;has_table( $tablename )
Returns <tt>true</tt> if the table with <tt>$tablename</tt> exists in the  database.
 
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  $version = $db-&gt;get_server_version


Return the database server version.
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===has_column===


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$boolean = $db-&gt;has_column( $table, $column )
<!-- Pod2Wiki=item_create_counters -->==create_counters==
Returns <tt>true</tt> if named <tt>$table</tt> has named <tt>$column</tt> in the  database.


  $n = $db-&gt;create_counters()
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Create and initialise the counters.


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<!-- Pod2Wiki=item_has_table -->==has_table==
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===connect===


  $boolean = $db-&gt;has_table( $tablename )
$db-&gt;connect()
Connects to the database.


Return true if the a table of the given name exists in the database.
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<!-- Pod2Wiki=item_has_column -->==has_column==


  $boolean = $db-&gt;has_column( $tablename, $columnname )
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===has_counter===


Return true if the a table of the given name has a column named $columnname in the database.
$success = $db-&gt;has_counter( $counter )
Returns <tt>true</tt> if <tt>$counter</tt> exists.


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<!-- Pod2Wiki=item_has_counter -->==has_counter==
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  $success = $db-&gt;has_counter( $counter )


Returns true if $counter exists.
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===create_counter===


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$success = $db-&gt;create_counter( $name )
<!-- Pod2Wiki=item_counter_next -->==counter_next==
Create and initialise to zero a new counter with <tt>$name</tt>.


  $n = $db-&gt;counter_next( $counter )
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===drop_counter===
$success = $db-&gt;drop_counter( $name )
Destroy the counter named <tt>$name</tt>.
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===remove_counters===
$success = $db-&gt;remove_counters
Destroy all counters.
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===counter_next===
$n = $db-&gt;counter_next( $counter )
Return the next unused value for the named counter. Returns undef if  the counter doesn't exist.
Return the next unused value for the named counter. Returns undef if  the counter doesn't exist.


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<!-- Pod2Wiki=item_counter_minimum -->==counter_minimum==
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  $db-&gt;counter_minimum( $counter, $value )


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===counter_minimum===
$db-&gt;counter_minimum( $counter, $value )
Ensure that the counter is set no lower that $value. This is used when importing eprints which may not be in scrict sequence.
Ensure that the counter is set no lower that $value. This is used when importing eprints which may not be in scrict sequence.


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<!-- Pod2Wiki=item_counter_reset -->==counter_reset==
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  $db-&gt;counter_reset( $counter )


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===counter_reset===
$db-&gt;counter_reset( $counter )
Return the counter. Use with cautiuon.
Return the counter. Use with cautiuon.


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<!-- Pod2Wiki=item_index_queue -->==index_queue==
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===get_default_charset===
 
$charset = $db-&gt;get_default_charset
Return the character set to use.  Always <tt>utf8</tt>.
 
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===get_default_collation===
 
$collation = $db-&gt;get_default_collation( $lang )
Return the collation to use for language <tt>$lang</tt>. Always <tt>utf8_bin</tt>.
 
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===get_primary_key===
 
@columns = $db-&gt;get_primary_key( $table )
Returns a list of column names that comprise the primary key for named named <tt>$table</tt>.
 
Returns an empty list if no primary key exists.
 
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===get_number_of_keys===
 
$num_keys = $db-&gt;get_number_of_keys( $table )
Returns the number of columns which are keys (<tt>PRI</tt>, <tt>MUL</tt> or  <tt>UNI</tt>) for named <tt>$table</tt>.
 
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===get_column_colation===
 
$collation = $db-&gt;get_column_colation( $table, $column )
Returns the collation for the named <tt>$column</tt> in the named <tt>$table</tt>.
 
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===quote_identifier===
 
$str = $db-&gt;quote_identifier( @parts )
Quote a database identifier (e.g. table names). Multiple <tt>@parts</tt> will be joined by dots (<tt>.</tt>).
 
We'll do quote here, because {{API:PodLink|file=DBD/mysql#quote_identifier|package_name=DBD::mysql#quote_identifier|section=|text=DBD::mysql#quote_identifier}} is really  slow.
 
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===prepare_regexp===
 
$sql = $db-&gt;prepare_regexp( $col, $value )
Oracle use the syntax:
 
$col REGEXP $value
 
For the quoted regexp <tt>$value</tt> and the quoted column <tt>$col</tt>.
 
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===sql_like===
 
$sql = $db-&gt;sql_LIKE()
Returns the syntactic glue to use when making a case-insensitive <tt>LIKE</tt> using <tt>utf8_general_ci</tt> collation.
 
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===ci_lookup===
 
$value = $db-&gt;ci_lookup( $field, $value )
This is a hacky method to support case-insensitive lookup for usernames, emails, etc.  It returns the actual case-sensitive version of <tt>$value</tt> if there is a case-insensitive match for the <tt>$field</tt>.
 
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===duplicate_error===
 
$boolean = $db-&gt;duplicate_error()
Returns a boolean for whether the database error is a duplicate error. Based on whether the {{API:PodLink|file=DBI#err|package_name=DBI#err|section=|text=DBI#err}} code is <tt>1062</tt>.
 
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===duplicate_error===
 
$boolean = $db-&gt;duplicate_error()
Returns a boolean for whether the database error is a retry error. Based on whether the {{API:PodLink|file=DBI#err|package_name=DBI#err|section=|text=DBI#err}} code is <tt>2006</tt>.
 
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===type_info===
 
$type_info = $db-&gt;type_info( $data_type )
See {{API:PodLink|file=DBI|package_name=DBI|section=type_info|text=DBI/type_info}}.
 
Uses <tt>LONGTEXT</tt> with column size 2^31 for <tt>SQL_CLOB</tt>.
 
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===index_name===
 
$name = $db-&gt;index_name( $table, @cols )
Returns the name of the first index that starts with named columns <tt>@cols</tt> in the named <tt>$table</tt>.
 
Returns <tt>undef</tt> if no index exists.
 
Uses MySQL 4.0+ compatible <tt>SHOW INDEX</tt>.
 
This method gets the entire <tt>SHOW INDEX</tt> response and builds a  look-up table of keys with their <tt>ordered</tt> columns. This ensures even  if MySQL is weird and returns out of order results we won't break.


  $db-&gt;index_queue( $datasetid, $objectid, $fieldname );
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Queues the field of the specified object to be reindexed.


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<!-- Pod2Wiki=head_undocumented_methods -->=UNDOCUMENTED METHODS=
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{{API:Undocumented Methods}}<!-- End of Pod2Wiki -->
<!-- Pod2Wiki=head_see_also -->
<!-- Pod2Wiki=item_create_counter -->==create_counter==
==SEE ALSO==
[[API:EPrints/Database|EPrints::Database]]


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<!-- Pod2Wiki=item_drop_counter -->==drop_counter==
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<!-- Pod2Wiki=item_get_primary_key -->==get_primary_key==


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<!-- Pod2Wiki=item_mysql_version_from_dbh -->==mysql_version_from_dbh==
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==COPYRIGHT==
{{API:Copyright}}
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<!-- Pod2Wiki=item_remove_counters -->==remove_counters==


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Latest revision as of 23:47, 11 January 2022

Latest Source Code (3.4, 3.3) | Revision Log | Before editing this page please read Pod2Wiki


NAME

EPrints::Database::mysql - custom database methods for MySQL DB

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DESCRIPTION

MySQL database wrapper.

Foreign keys will be defined if you use a DB engine that supports them (e.g. InnoDB).

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Synopsis

   $c->{dbdriver} = 'mysql';
   # $c->{dbhost} = 'localhost';
   # $c->{dbport} = '3316';
   $c->{dbname} = 'myrepo';
   $c->{dbuser} = 'bob';
   $c->{dbpass} = 'asecret';
   # $c->{dbengine} = 'InnoDB';

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MySQL-specific Annoyances

MySQL does not support sequences.

MySQL is (by default) lax about truncation.

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CONSTANTS

See EPrints::Database.

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INSTANCE VARIABLES

See EPrints::Database.

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METHODS

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get_server_version

$version = $db->get_server_version

Returns the database server version.

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mysql_version_from_dbh

$version = $db->mysql_version_from_dbh

Returns the MySQL database server version from handle $dbh.

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create

$version = $db->create( $username, $password )

Creates EPrints database as user with $username and $password.

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create_counters

$n = $db->create_counters()

Creates and initialises the counters.

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has_table

$boolean = $db->has_table( $tablename )

Returns true if the table with $tablename exists in the database.

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has_column

$boolean = $db->has_column( $table, $column )

Returns true if named $table has named $column in the database.

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connect

$db->connect()

Connects to the database.

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has_counter

$success = $db->has_counter( $counter )

Returns true if $counter exists.

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create_counter

$success = $db->create_counter( $name )

Create and initialise to zero a new counter with $name.

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drop_counter

$success = $db->drop_counter( $name )

Destroy the counter named $name.

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remove_counters

$success = $db->remove_counters

Destroy all counters.

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counter_next

$n = $db->counter_next( $counter )

Return the next unused value for the named counter. Returns undef if the counter doesn't exist.

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counter_minimum

$db->counter_minimum( $counter, $value )

Ensure that the counter is set no lower that $value. This is used when importing eprints which may not be in scrict sequence.

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counter_reset

$db->counter_reset( $counter )

Return the counter. Use with cautiuon.

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get_default_charset

$charset = $db->get_default_charset

Return the character set to use. Always utf8.

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get_default_collation

$collation = $db->get_default_collation( $lang )

Return the collation to use for language $lang. Always utf8_bin.

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get_primary_key

@columns = $db->get_primary_key( $table )

Returns a list of column names that comprise the primary key for named named $table.

Returns an empty list if no primary key exists.

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get_number_of_keys

$num_keys = $db->get_number_of_keys( $table )

Returns the number of columns which are keys (PRI, MUL or UNI) for named $table.

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get_column_colation

$collation = $db->get_column_colation( $table, $column )

Returns the collation for the named $column in the named $table.

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quote_identifier

$str = $db->quote_identifier( @parts )

Quote a database identifier (e.g. table names). Multiple @parts will be joined by dots (.).

We'll do quote here, because DBD::mysql#quote_identifier is really slow.

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prepare_regexp

$sql = $db->prepare_regexp( $col, $value )

Oracle use the syntax: 

$col REGEXP $value

For the quoted regexp $value and the quoted column $col.

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sql_like

$sql = $db->sql_LIKE()

Returns the syntactic glue to use when making a case-insensitive LIKE using utf8_general_ci collation.

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ci_lookup

$value = $db->ci_lookup( $field, $value )

This is a hacky method to support case-insensitive lookup for usernames, emails, etc. It returns the actual case-sensitive version of $value if there is a case-insensitive match for the $field.

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duplicate_error

$boolean = $db->duplicate_error()

Returns a boolean for whether the database error is a duplicate error. Based on whether the DBI#err code is 1062.

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duplicate_error

$boolean = $db->duplicate_error()

Returns a boolean for whether the database error is a retry error. Based on whether the DBI#err code is 2006.

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type_info

$type_info = $db->type_info( $data_type )

See DBI/type_info.

Uses LONGTEXT with column size 2^31 for SQL_CLOB.

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index_name

$name = $db->index_name( $table, @cols )

Returns the name of the first index that starts with named columns @cols in the named $table.

Returns undef if no index exists.

Uses MySQL 4.0+ compatible SHOW INDEX.

This method gets the entire SHOW INDEX response and builds a look-up table of keys with their ordered columns. This ensures even if MySQL is weird and returns out of order results we won't break.

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SEE ALSO

EPrints::Database

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COPYRIGHT

© Copyright 2000-2024 University of Southampton.

EPrints 3.4 is supplied by EPrints Services.

http://www.eprints.org/eprints-3.4/

LICENSE

This file is part of EPrints 3.4 http://www.eprints.org/.

EPrints 3.4 and this file are released under the terms of the GNU Lesser General Public License version 3 as published by the Free Software Foundation unless otherwise stated.

EPrints 3.4 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with EPrints 3.4. If not, see http://www.gnu.org/licenses/.

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