【发布时间】：2015-05-28 21:59:29
【问题描述】：
我正在为 mySQL 数据库开发 API。作为框架，我们使用 cakePHP。在构建 API 之后，我们很高兴，直到我们开始在数据库中添加越来越多的记录。我们发现我们使用的查询使用 filesort() 按时间排序。虽然我们索引了时间。为了强制执行 SQL，我们尝试在 phpmyadmin 中使用 FORCE INDEX，效果很好。查询速度从 12s 到 0.0056。
剩下的唯一问题是框架 cakePHP 不支持索引。我在互联网上搜索了一整天，但找不到最终答案。最近的解决方案来自：cakephp force index at model，但我没有让它正常工作。我想我使用的是更新版本的 cakephp (2.5.4)。
现在的查询：
$resultSet = $this->Book->find('all',array(
'fields' => array('Book.*'),
'contain' => array(
'GeneralSelectMinimumage'=> array('fields'=> array('age')),
'Combine'=> array(
'Location' => array(
//'fields' => array('name,short_description'),
'LocationSelectAddressid' => array(
'LocationAddress'=>array(
'RegionSelectCity'=>array(
'RegionCity'=>array(
'Region'
)
)
)
),
'LocationSelectFacilityid' => array(
'LocationFacility' => array(
'LocationSelectFacility',
'LocationSelectFacilityAnswer'
)
),
'LocationSelectImagesid' => array(
'GeneralImage'
),
),
'author' => array(
'authorSelectauthortypeid' => array(
'authorSelectType'
),
'authorSelectImageid'=>array('GeneralImage'),
)
),
'BookSelectLocationtypeid' => array(
'BookSelectLocationtype'
),
'BookSelectImageid'=> array(
'GeneralImage'
),
'BookSelectVideoid'=> array(
'GeneralVideo'
),
'BookSelectCategoryid'=> array(
'BookCategory'
),
'BookPrice' => array(
'BookSelectPrice',
'BookSelectMethod'
),
'BookSelectObtainid' => array(
'BookObtain'=>array(
'BookSelectObtain'
)
),
'BookSelectTypeid'=>array(
'BookSelectType'
)
),
'joins' => array(
array(
'table' => 'Book_select_categoryid',
'alias' => 'BookSelectCategoryid',
'type' => 'LEFT',
'conditions' => array('Book.id = BookSelectCategoryid.Bookid')
),
array(
'table' => 'Book_category',
'alias' => 'BookCategory',
'type' => 'LEFT',
'conditions' => array('BookSelectCategoryid.categoryid = BookCategory.id')
),
/*array(
'table' => 'Book_price',
'alias' => 'BookPrice',
'type' => 'LEFT',
'conditions' => array('Book.id = BookPrice.Bookid')
),*/
array(
'table' => 'Book_select_price',
'alias' => 'BookSelectPrice',
'type' => 'LEFT',
'conditions' => array('BookPrice.select_priceid = BookSelectPrice.id')
),
array(
'table' => 'COMBINE',
'alias' => 'Combine',
'type' => 'INNER',
'conditions' => array('Book.id = Combine.Bookid')
),
array(
'table' => 'author',
'alias' => 'author',
'type' => 'LEFT',
'conditions' => array('Combine.authorid = author.id AND author.active=1')
),
array(
'table' => 'author_select_imageid',
'alias' => 'authorSelectImageid',
'type' => 'LEFT',
'conditions' => array('author.id = authorSelectImageid.authorid')
),
array(
'table' => 'general_image',
'alias' => 'GeneralImage',
'type' => 'LEFT',
'conditions' => array('GeneralImage.id = authorSelectImageid.imageid OR GeneralImage.id = LocationSelectImagesid.imagesid ')
),
array(
'table' => 'Book_select_type',
'alias' => 'BookSelectType',
'type' => 'LEFT',
'conditions' => array('BookSelectTypeid.typeid = BookSelectType.id')
),
),
'conditions' => array('Book.time >= NOW()','Book.active'=>1, $filters),
'order'=> array('Book.time asc'),
'limit' => $limit,
'offset' => $offset
));
我现在真的一无所知，有什么想法吗？
解决方案 每当所选表是预订时，我会更改DBOSOURCE.php中的CAKEPHP QueryBuilder。对更大的项目不负责，但在这里可以解决问题。
public function renderStatement($type, $data) {
extract($data);
$aliases = null;
switch (strtolower($type)) {
case 'select':
// die('TABLE=' . $table);
if($table == "book"){
return trim("SELECT {$fields} FROM {$table} {$alias} FORCE INDEX(time) {$joins} {$conditions} {$group} {$order} {$limit}");
}
别的 {
return trim("SELECT {$fields} FROM {$table} {$alias} {$joins} {$conditions} {$group} {$order} {$limit}");
}
case 'create':
return "INSERT INTO {$table} ({$fields}) VALUES ({$values})";
case 'update':
if (!empty($alias)) {
$aliases = "{$this->alias}{$alias} {$joins} ";
}
return trim("UPDATE {$table} {$aliases}SET {$fields} {$conditions}");
case 'delete':
if (!empty($alias)) {
$aliases = "{$this->alias}{$alias} {$joins} ";
}
return trim("DELETE {$alias} FROM {$table} {$aliases}{$conditions}");
case 'schema':
foreach (array('columns', 'indexes', 'tableParameters') as $var) {
if (is_array(${$var})) {
${$var} = "\t" . implode(",\n\t", array_filter(${$var}));
} else {
${$var} = '';
}
}
if (trim($indexes) !== '') {
$columns .= ',';
}
return "CREATE TABLE {$table} (\n{$columns}{$indexes}) {$tableParameters};";
case 'alter':
return;
}
}
【问题讨论】：
-
你索引你所有的外键了吗？
-
是的，我做了 EXPLAIN SELECT，一切都在使用索引