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Re-arrange the re-order code to only run if multi-aliases are used

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git-svn-id: file:///svn/phpbb/branches/phpBB-3_0_0@9178 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
Meik Sievertsen 2008-12-06 11:11:10 +00:00
parent 23de8dd0ce
commit 689831ecdd
1 changed files with 21 additions and 23 deletions
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20
phpBB/includes/db/dbal.php
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@ -502,10 +502,14 @@ class dbal
// Build table array. We also build an alias array for later checks.
$table_array = $aliases = array();
$used_multi_alias = false;
foreach ($array['FROM'] as $table_name => $alias)
{
if (is_array($alias))
{
$used_multi_alias = true;
foreach ($alias as $multi_alias)
{
$table_array[] = $table_name . ' ' . $multi_alias;
@ -520,11 +524,9 @@ class dbal
}
// We run the following code to determine if we need to re-order the table array. ;)
// The reason for this is that for multiple tables in the FROM statement the last table need to match the first LEFT JOIN'ed table.
// DBMS who rely on this (at the moment i only spotted it on multi-aliases): Oracle, PostgreSQL and MSSQL
$first_join_match = false;
if (!empty($array['LEFT_JOIN']) && sizeof($array['FROM']) > 1)
// The reason for this is that for multi-aliased tables (two equal tables) in the FROM statement the last table need to match the first comparison.
// DBMS who rely on this: Oracle, PostgreSQL and MSSQL. For all other DBMS it makes absolutely no difference in which order the table is.
if (!empty($array['LEFT_JOIN']) && sizeof($array['FROM']) > 1 && $used_multi_alias !== false)
{
// Take first LEFT JOIN
$join = current($array['LEFT_JOIN']);
@ -532,15 +534,10 @@ class dbal
// Determine the table used there (even if there are more than one used, we only want to have one
preg_match('/(' . implode('|', $aliases) . ')\.[^\s]+/U', str_replace(array('(', ')', 'AND', 'OR', ' '), '', $join['ON']), $matches);
// If there is a first join match, we need to make sure the table order is correct
if (!empty($matches[1]))
{
$first_join_match = trim($matches[1]);
}
}
// If there is a first join match, we need to make sure the table order is correct
if ($first_join_match !== false)
{
$table_array = $last = array();
foreach ($array['FROM'] as $table_name => $alias)
@ -560,6 +557,7 @@ class dbal
$table_array = array_merge($table_array, $last);
}
}
$sql .= $this->_sql_custom_build('FROM', implode(', ', $table_array));