Can you specify the table collation when creating a table via db_create_table() (or hook_schema())? I didn't find any documentation (or issue) on this, but I hope it is possible? Otherwise, this is definitely a feature request for D8.

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#7 drupal-1144644-7-enabling-myqsl-collation.patch2.93 KBBarisW
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drunken monkey’s picture

drunken monkey
he/him
Primary language German
Location Vienna, Austria
CreditAttribution: drunken monkey commented
Title: How to specify the collation when creating a database table? » Enable specifying the collation when creating a database table
Version: 7.x-dev » 8.x-dev
Category: support » feature

I'll take that as a "no".

Feature request: While the "general_ci" collation makes sense in most cases, there are some when this leads to unexpected, and unwanted, results. E.g., when using primary / unique keys of type varchar, "A" and "à" (and lots of others) will be treated equivalently, resulting in possible collissions and, consequently, exceptions. If a module developer knows that this might happen for a module, they should be able to specify another collation to circumvent this (utf8_bin, probably).
A "collation" key in the schema structure should do. Alternatively, I'd also be content with a "binary" key (defaulting to FALSE) which switches to binary collation (utf8_bin) when set.

fabsor’s picture

fabsor CreditAttribution: fabsor commented

I agree that this could be an issue, however, you can set a global setting in settings.php, which affects all tables. Which setting would take precedence upon installation?

drunken monkey’s picture

drunken monkey
he/him
Primary language German
Location Vienna, Austria
CreditAttribution: drunken monkey commented

Yes, I know, but that doesn't solve the issue. We want to be able to choose the collation from the module, not depend on the user to change that setting. For most tables, the default setting is the better choice after all.

Sylvain Lecoy’s picture

Sylvain Lecoy CreditAttribution: Sylvain Lecoy commented

We should add a collation field in a column definition:

<?php
'description' => 'Stores character data.',
    'fields' => array(
      'cid' => array(
        'description' => 'Primary Key: Unique character ID.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'uid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => "User's {users}.uid.",
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'description' => "Character's name.",
        'collation' => 'latin1_general_cs', // I need case sensitive storage for this field only !
      ),
?>
jefkin’s picture

jefkin CreditAttribution: jefkin commented

drunken monkey ++

Sylvain Lecoy ++

Nice expression of the needed configuration options Sylvain

BarisW’s picture

BarisW CreditAttribution: BarisW commented

Deleted my comment, thought this was a Search API DB issue, but it seemed a Drupal Core thing.

BarisW’s picture

BarisW CreditAttribution: BarisW commented
Status: Active » Needs review
FileSize
drupal-1144644-7-enabling-myqsl-collation.patch2.93 KB

Patch attached to add this in D8. Allows setting collation on a table-base or on a column-base.

Pancho’s picture

Pancho
Location UTC+2 🇪🇺 EU
CreditAttribution: Pancho commented
Issue tags: +database collation, +D8MI, +needs profiling

Nice, but what about performance?
Crell says that joining tables with different collations leads to indexes being ignored and thus incredibly slow queries, see #772678-47: Database default collation is not respected.
Does this also apply to differing collations within a table? We should find out.

michlis’s picture

michlis CreditAttribution: michlis commented
Assigned: Unassigned » michlis
Issue summary: View changes

Patch applies to latest D8 version, testing in progress.

Version: 8.0.x-dev » 8.1.x-dev

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marvil07’s picture

marvil07 CreditAttribution: marvil07 as a volunteer commented
Status: Needs review » Needs work
Issue tags: +Needs tests
Related issues: +#1237252: DB Case Sensitivity: Allow BINARY attribute in MySQL

Adding related issue: binary collation in mysql can be specified now after #1237252.

It has been a while since this patch was written, it does not apply anymore, moving to NW, also I am wondering about how to test this.

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