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[ticket/12012] Drop and recreate indexes when removing columns

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PHPBB3-12012
This commit is contained in:
Joas Schilling 2014-04-14 17:21:53 +02:00
parent 5403848902
commit 7dc163f2b7
1 changed files with 33 additions and 2 deletions
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35
phpBB/phpbb/db/tools.php
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@ -1846,15 +1846,46 @@ class tools
case 'mssql':
case 'mssqlnative':
// We need the data here
$old_return_statements = $this->return_statements;
$this->return_statements = true;
$indexes = $this->mssql_get_existing_indexes($table_name, $column_name);
// Drop any indexes
$recreate_indexes = array();
if (!empty($indexes))
{
trigger_error("Column '$column_name' on table '$table_name' is still part of an index and can not be removed: " . implode(', ', array_keys($indexes)), E_USER_ERROR);
foreach ($indexes as $index_name => $index_data)
{
$result = $this->sql_index_drop($table_name, $index_name);
$statements = array_merge($statements, $result);
if (sizeof($index_data) > 1)
{
// Remove this column from the index and recreate it
$recreate_indexes[$index_name] = array_diff($index_data, array($column_name));
}
}
}
$statements = $this->mssql_drop_default_constraints($table_name, $column_name);
// Drop default value constraint
$result = $this->mssql_drop_default_constraints($table_name, $column_name);
$statements = array_merge($statements, $result);
// Remove the column
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP COLUMN [' . $column_name . ']';
if (!empty($recreate_indexes))
{
// Recreate indexes after we removed the column
foreach ($recreate_indexes as $index_name => $index_data)
{
$result = $this->sql_create_index($table_name, $index_name, $index_data);
$statements = array_merge($statements, $result);
}
}
$this->return_statements = $old_return_statements;
break;
case 'mysql_40':