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Merge pull request #3132 from annando/1701-remove-duplicates

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Adding unique indexes should now work with every MySQL flavour
This commit is contained in:
Tobias Diekershoff 2017-01-30 08:40:26 +01:00 committed by GitHub
commit 0b04e0383c
1 changed files with 71 additions and 51 deletions
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122
include/dbstructure.php
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@ -187,7 +187,8 @@ function update_structure($verbose, $action, $tables=null, $definition=null) {
// Compare it
foreach ($definition AS $name => $structure) {
$is_new_table = False;
$sql3="";
$group_by = "";
$sql3 = "";
if (!isset($database[$name])) {
$r = db_create_table($name, $structure["fields"], $charset, $verbose, $action, $structure['indexes']);
if (!dbm::is_result($r)) {
@ -208,10 +209,9 @@ function update_structure($verbose, $action, $tables=null, $definition=null) {
if ($current_index_definition != $new_index_definition) {
if ($fieldnames[0] == "UNIQUE") {
$is_unique = true;
// Deactivated. See below for the reason
//if ($ignore == "") {
// $temp_name = "temp-".$name;
//}
if ($ignore == "") {
$temp_name = "temp-".$name;
}
}
}
}
@ -277,7 +277,12 @@ function update_structure($verbose, $action, $tables=null, $definition=null) {
}
$new_index_definition = implode(",",$fieldnames);
if ($current_index_definition != $new_index_definition) {
$sql2=db_create_index($indexname, $fieldnames);
$sql2 = db_create_index($indexname, $fieldnames);
// Fetch the "group by" fields for unique indexes
if ($fieldnames[0] == "UNIQUE") {
$group_by = db_group_by($indexname, $fieldnames);
}
if ($sql2 != "") {
if ($sql3 == "")
$sql3 = "ALTER" . $ignore . " TABLE `".$temp_name."` ".$sql2;
@ -293,44 +298,38 @@ function update_structure($verbose, $action, $tables=null, $definition=null) {
if ($verbose) {
// Ensure index conversion to unique removes duplicates
if ($is_unique) {
// By now the alternative is commented out.
// This is a preparation for the time when we found a good SQL routine.
//if ($ignore != "") {
if ($ignore != "") {
echo "SET session old_alter_table=1;\n";
//} else {
// echo "CREATE TABLE `".$temp_name."` LIKE `".$name."`;\n";
//}
} else {
echo "CREATE TABLE `".$temp_name."` LIKE `".$name."`;\n";
}
}
echo $sql3."\n";
if ($is_unique) {
// By now the alternative is commented out.
// This is a preparation for the time when we found a good SQL routine.
//if ($ignore != "") {
if ($ignore != "") {
echo "SET session old_alter_table=0;\n";
//} else {
// echo "INSERT IGNORE INTO `".$temp_name."` SELECT * FROM `".$name."`;\n";
// echo "DROP TABLE `".$name."`;\n";
// echo "RENAME TABLE `".$temp_name."` TO `".$name."`;\n";
//}
} else {
echo "INSERT INTO `".$temp_name."` SELECT * FROM `".$name."`".$group_by.";\n";
echo "DROP TABLE `".$name."`;\n";
echo "RENAME TABLE `".$temp_name."` TO `".$name."`;\n";
}
}
}
if ($action) {
// Ensure index conversion to unique removes duplicates
if ($is_unique) {
// By now the alternative is commented out.
// This is a preparation for the time when we found a good SQL routine.
//if ($ignore != "") {
if ($ignore != "") {
$db->q("SET session old_alter_table=1;");
//} else {
// $r = $db->q("CREATE TABLE `".$temp_name."` LIKE `".$name."`;");
// if (!dbm::is_result($r)) {
// $errors .= t('Errors encountered performing database changes.').$sql3.EOL;
// return $errors;
// }
//}
} else {
$r = $db->q("CREATE TABLE `".$temp_name."` LIKE `".$name."`;");
if (!dbm::is_result($r)) {
$errors .= t('Errors encountered performing database changes.').$sql3.EOL;
return $errors;
}
}
}
$r = @$db->q($sql3);
@ -338,28 +337,25 @@ function update_structure($verbose, $action, $tables=null, $definition=null) {
$errors .= t('Errors encountered performing database changes.').$sql3.EOL;
if ($is_unique) {
// By now the alternative is commented out.
// This is a preparation for the time when we found a good SQL routine.
//if ($ignore != "") {
if ($ignore != "") {
$db->q("SET session old_alter_table=0;");
//} else {
// We have to check if "INSERT IGNORE" will work on newer MySQL versions
// $r = $db->q("INSERT IGNORE INTO `".$temp_name."` SELECT * FROM `".$name."`;");
// if (!dbm::is_result($r)) {
// $errors .= t('Errors encountered performing database changes.').$sql3.EOL;
// return $errors;
// }
// $r = $db->q("DROP TABLE `".$name."`;");
// if (!dbm::is_result($r)) {
// $errors .= t('Errors encountered performing database changes.').$sql3.EOL;
// return $errors;
// }
// $r = $db->q("RENAME TABLE `".$temp_name."` TO `".$name."`;");
// if (!dbm::is_result($r)) {
// $errors .= t('Errors encountered performing database changes.').$sql3.EOL;
// return $errors;
// }
//}
} else {
$r = $db->q("INSERT INTO `".$temp_name."` SELECT * FROM `".$name."`".$group_by.";");
if (!dbm::is_result($r)) {
$errors .= t('Errors encountered performing database changes.').$sql3.EOL;
return $errors;
}
$r = $db->q("DROP TABLE `".$name."`;");
if (!dbm::is_result($r)) {
$errors .= t('Errors encountered performing database changes.').$sql3.EOL;
return $errors;
}
$r = $db->q("RENAME TABLE `".$temp_name."` TO `".$name."`;");
if (!dbm::is_result($r)) {
$errors .= t('Errors encountered performing database changes.').$sql3.EOL;
return $errors;
}
}
}
}
}
@ -477,6 +473,30 @@ function db_create_index($indexname, $fieldnames, $method="ADD") {
return($sql);
}
function db_group_by($indexname, $fieldnames) {
if ($fieldnames[0] != "UNIQUE") {
return "";
}
array_shift($fieldnames);
$names = "";
foreach ($fieldnames AS $fieldname) {
if ($names != "")
$names .= ",";
if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
$names .= "`".dbesc($matches[1])."`";
} else {
$names .= "`".dbesc($fieldname)."`";
}
}
$sql = sprintf(" GROUP BY %s", $names);
return $sql;
}
function db_index_suffix($charset, $reduce = 0) {
if ($charset != "utf8mb4") {
return "";