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Be more intelligent about limiting the index size

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This commit is contained in:
Kijin Sung 2016-01-11 13:50:39 +09:00
parent 4416c39fb2
commit 43033763f0
1 changed files with 16 additions and 12 deletions
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28
classes/db/DBMysql.class.php
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@ -593,6 +593,7 @@ class DBMysql extends DB
$default = $column->attrs->default;
$auto_increment = $column->attrs->auto_increment;
$column_charset = '';
$index_size_limit = '';
// MySQL only supports 767 bytes for indexed columns.
// This is 191 characters in utf8mb4 and 255 characters in utf8.
@ -602,13 +603,16 @@ class DBMysql extends DB
}
elseif(($primary_key || $unique || $index) && stripos($type, 'char') !== false)
{
if($size > 191 && $this->charset === 'utf8mb4')
if($size > 255 || ($size > 191 && $this->charset === 'utf8mb4'))
{
$column_charset = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci';
}
if($size > 255)
{
$size = 255;
if($primary_key || $unique)
{
$size = ($this->charset === 'utf8mb4') ? 191 : 255;
}
else
{
$index_size_limit = '(' . (($this->charset === 'utf8mb4') ? 191 : 255) . ')';
}
}
}
@ -624,15 +628,15 @@ class DBMysql extends DB
if($primary_key)
{
$primary_list[] = $name;
$primary_list[] = "`$name`";
}
else if($unique)
{
$unique_list[$unique][] = $name;
$unique_list[$unique][] = "`$name`" . $index_size_limit;
}
else if($index)
{
$index_list[$index][] = $name;
$index_list[$index][] = "`$name`" . $index_size_limit;
}
}
@ -641,20 +645,20 @@ class DBMysql extends DB
// Process indexes
if(count($primary_list))
{
$column_schema[] = sprintf("PRIMARY KEY (%s)", '`' . implode($primary_list, '`, `') . '`');
$column_schema[] = sprintf("PRIMARY KEY (%s)", implode($primary_list, ', '));
}
if(count($unique_list))
{
foreach($unique_list as $key => $val)
{
$column_schema[] = sprintf("UNIQUE %s (%s)", $key, '`' . implode($val, '`, `') . '`');
$column_schema[] = sprintf("UNIQUE %s (%s)", $key, implode($val, ', '));
}
}
if(count($index_list))
{
foreach($index_list as $key => $val)
{
$column_schema[] = sprintf("INDEX %s (%s)", $key, '`' . implode($val, '`, `') . '`');
$column_schema[] = sprintf("INDEX %s (%s)", $key, implode($val, ', '));
}
}