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MySQL: Speed up displaying tables in large databases (bug #700)

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This commit is contained in:
Jakub Vrana 2019-08-19 18:14:16 +02:00
parent ab76024da7
commit 67b84d1167
2 changed files with 19 additions and 12 deletions
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28
adminer/drivers/mysql.inc.php
View file

@ -583,18 +583,24 @@ if (!defined("DRIVER")) {
* @return array array($name => array("db" => , "ns" => , "table" => , "source" => array(), "target" => array(), "on_delete" => , "on_update" => ))
*/
function foreign_keys($table) {
global $connection, $on_actions;
static $pattern = '(?:`(?:[^`]|``)+`|(?:"(?:[^"]|"")+"))';
$return = array();
foreach (get_rows("SELECT * FROM information_schema.REFERENTIAL_CONSTRAINTS WHERE CONSTRAINT_SCHEMA = DATABASE() AND TABLE_NAME = " . q($table)) as $row) {
$columns = get_key_vals("SELECT COLUMN_NAME, REFERENCED_COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE WHERE CONSTRAINT_SCHEMA = DATABASE() AND CONSTRAINT_NAME = " . q($row["CONSTRAINT_NAME"]) . " ORDER BY ORDINAL_POSITION");
$db = $row["UNIQUE_CONSTRAINT_SCHEMA"];
$return[$row["CONSTRAINT_NAME"]] = array(
"db" => ($db == DB ? "" : $db),
"table" => $row["REFERENCED_TABLE_NAME"],
"source" => array_keys($columns),
"target" => array_values($columns),
"on_delete" => $row["DELETE_RULE"],
"on_update" => $row["UPDATE_RULE"],
);
$create_table = $connection->result("SHOW CREATE TABLE " . table($table), 1);
if ($create_table) {
preg_match_all("~CONSTRAINT ($pattern) FOREIGN KEY ?\\(((?:$pattern,? ?)+)\\) REFERENCES ($pattern)(?:\\.($pattern))? \\(((?:$pattern,? ?)+)\\)(?: ON DELETE ($on_actions))?(?: ON UPDATE ($on_actions))?~", $create_table, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
preg_match_all("~$pattern~", $match[2], $source);
preg_match_all("~$pattern~", $match[5], $target);
$return[idf_unescape($match[1])] = array(
"db" => idf_unescape($match[4] != "" ? $match[3] : $match[4]),
"table" => idf_unescape($match[4] != "" ? $match[4] : $match[3]),
"source" => array_map('idf_unescape', $source[0]),
"target" => array_map('idf_unescape', $target[0]),
"on_delete" => ($match[6] ? $match[6] : "RESTRICT"),
"on_update" => ($match[7] ? $match[7] : "RESTRICT"),
);
}
}
return $return;
}

3
changes.txt
View file

@ -1,4 +1,5 @@
Adminer 4.7.3-dev:
MySQL: Speed up displaying tables in large databases (bug #700)
MySQL: Skip editing generated columns
SQLite: Quote strings stored in integer columns in export (bug #696)
@ -8,7 +9,7 @@ Stretch footer over the whole table width (bug #624)
Allow overwriting tables when copying them
Fix displaying SQL command after Save and continue edit
Cache busting for adminer.css
MySQL: Fix displaying multi-columns foreign keys (bug #675)
MySQL: Fix displaying multi-columns foreign keys (bug #675, regression from 4.7.0)
MySQL: Fix creating users and changing password in MySQL 8 (bug #663)
MySQL: Pass SRID to GeomFromText
PostgreSQL: Fix setting column comments on new table