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600 lines
21 KiB
PHP
600 lines
21 KiB
PHP
<?php
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/**
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* @link https://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license https://www.yiiframework.com/license/
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*/
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namespace yii\db\mysql;
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use Yii;
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use yii\base\InvalidConfigException;
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use yii\base\NotSupportedException;
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use yii\db\Constraint;
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use yii\db\ConstraintFinderInterface;
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use yii\db\ConstraintFinderTrait;
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use yii\db\Exception;
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use yii\db\Expression;
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use yii\db\ForeignKeyConstraint;
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use yii\db\IndexConstraint;
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use yii\db\TableSchema;
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use yii\helpers\ArrayHelper;
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/**
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* Schema is the class for retrieving metadata from a MySQL database (version 4.1.x and 5.x).
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Schema extends \yii\db\Schema implements ConstraintFinderInterface
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{
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use ConstraintFinderTrait;
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/**
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* {@inheritdoc}
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*/
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public $columnSchemaClass = 'yii\db\mysql\ColumnSchema';
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/**
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* @var bool whether MySQL used is older than 5.1.
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*/
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private $_oldMysql;
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/**
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* @var array mapping from physical column types (keys) to abstract column types (values)
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*/
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public $typeMap = [
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'tinyint' => self::TYPE_TINYINT,
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'bool' => self::TYPE_TINYINT,
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'boolean' => self::TYPE_TINYINT,
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'bit' => self::TYPE_INTEGER,
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'smallint' => self::TYPE_SMALLINT,
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'mediumint' => self::TYPE_INTEGER,
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'int' => self::TYPE_INTEGER,
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'integer' => self::TYPE_INTEGER,
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'bigint' => self::TYPE_BIGINT,
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'float' => self::TYPE_FLOAT,
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'double' => self::TYPE_DOUBLE,
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'double precision' => self::TYPE_DOUBLE,
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'real' => self::TYPE_FLOAT,
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'decimal' => self::TYPE_DECIMAL,
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'numeric' => self::TYPE_DECIMAL,
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'dec' => self::TYPE_DECIMAL,
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'fixed' => self::TYPE_DECIMAL,
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'tinytext' => self::TYPE_TEXT,
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'mediumtext' => self::TYPE_TEXT,
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'longtext' => self::TYPE_TEXT,
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'longblob' => self::TYPE_BINARY,
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'blob' => self::TYPE_BINARY,
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'text' => self::TYPE_TEXT,
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'varchar' => self::TYPE_STRING,
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'string' => self::TYPE_STRING,
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'char' => self::TYPE_CHAR,
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'datetime' => self::TYPE_DATETIME,
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'year' => self::TYPE_DATE,
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'date' => self::TYPE_DATE,
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'time' => self::TYPE_TIME,
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'timestamp' => self::TYPE_TIMESTAMP,
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'enum' => self::TYPE_STRING,
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'set' => self::TYPE_STRING,
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'binary' => self::TYPE_BINARY,
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'varbinary' => self::TYPE_BINARY,
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'json' => self::TYPE_JSON,
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];
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/**
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* {@inheritdoc}
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*/
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protected $tableQuoteCharacter = '`';
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/**
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* {@inheritdoc}
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*/
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protected $columnQuoteCharacter = '`';
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/**
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* {@inheritdoc}
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*/
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protected function resolveTableName($name)
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{
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$resolvedName = new TableSchema();
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$parts = explode('.', str_replace('`', '', $name));
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if (isset($parts[1])) {
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$resolvedName->schemaName = $parts[0];
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$resolvedName->name = $parts[1];
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} else {
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$resolvedName->schemaName = $this->defaultSchema;
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$resolvedName->name = $name;
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}
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$resolvedName->fullName = ($resolvedName->schemaName !== $this->defaultSchema ? $resolvedName->schemaName . '.' : '') . $resolvedName->name;
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return $resolvedName;
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}
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/**
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* {@inheritdoc}
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*/
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protected function findTableNames($schema = '')
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{
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$sql = 'SHOW TABLES';
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if ($schema !== '') {
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$sql .= ' FROM ' . $this->quoteSimpleTableName($schema);
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}
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return $this->db->createCommand($sql)->queryColumn();
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}
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/**
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* {@inheritdoc}
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*/
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protected function loadTableSchema($name)
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{
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$table = new TableSchema();
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$this->resolveTableNames($table, $name);
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if ($this->findColumns($table)) {
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$this->findConstraints($table);
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return $table;
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}
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return null;
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}
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/**
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* {@inheritdoc}
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*/
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protected function loadTablePrimaryKey($tableName)
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{
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return $this->loadTableConstraints($tableName, 'primaryKey');
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}
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/**
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* {@inheritdoc}
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*/
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protected function loadTableForeignKeys($tableName)
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{
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return $this->loadTableConstraints($tableName, 'foreignKeys');
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}
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/**
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* {@inheritdoc}
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*/
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protected function loadTableIndexes($tableName)
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{
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static $sql = <<<'SQL'
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SELECT
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`s`.`INDEX_NAME` AS `name`,
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`s`.`COLUMN_NAME` AS `column_name`,
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`s`.`NON_UNIQUE` ^ 1 AS `index_is_unique`,
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`s`.`INDEX_NAME` = 'PRIMARY' AS `index_is_primary`
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FROM `information_schema`.`STATISTICS` AS `s`
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WHERE `s`.`TABLE_SCHEMA` = COALESCE(:schemaName, DATABASE()) AND `s`.`INDEX_SCHEMA` = `s`.`TABLE_SCHEMA` AND `s`.`TABLE_NAME` = :tableName
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ORDER BY `s`.`SEQ_IN_INDEX` ASC
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SQL;
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$resolvedName = $this->resolveTableName($tableName);
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$indexes = $this->db->createCommand($sql, [
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':schemaName' => $resolvedName->schemaName,
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':tableName' => $resolvedName->name,
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])->queryAll();
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$indexes = $this->normalizePdoRowKeyCase($indexes, true);
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$indexes = ArrayHelper::index($indexes, null, 'name');
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$result = [];
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foreach ($indexes as $name => $index) {
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$result[] = new IndexConstraint([
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'isPrimary' => (bool) $index[0]['index_is_primary'],
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'isUnique' => (bool) $index[0]['index_is_unique'],
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'name' => $name !== 'PRIMARY' ? $name : null,
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'columnNames' => ArrayHelper::getColumn($index, 'column_name'),
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]);
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}
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return $result;
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}
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/**
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* {@inheritdoc}
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*/
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protected function loadTableUniques($tableName)
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{
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return $this->loadTableConstraints($tableName, 'uniques');
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}
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/**
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* {@inheritdoc}
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* @throws NotSupportedException if this method is called.
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*/
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protected function loadTableChecks($tableName)
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{
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throw new NotSupportedException('MySQL does not support check constraints.');
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}
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/**
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* {@inheritdoc}
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* @throws NotSupportedException if this method is called.
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*/
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protected function loadTableDefaultValues($tableName)
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{
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throw new NotSupportedException('MySQL does not support default value constraints.');
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}
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/**
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* Creates a query builder for the MySQL database.
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* @return QueryBuilder query builder instance
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*/
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public function createQueryBuilder()
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{
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return Yii::createObject(QueryBuilder::className(), [$this->db]);
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}
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/**
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* Resolves the table name and schema name (if any).
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* @param TableSchema $table the table metadata object
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* @param string $name the table name
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*/
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protected function resolveTableNames($table, $name)
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{
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$parts = explode('.', str_replace('`', '', $name));
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if (isset($parts[1])) {
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$table->schemaName = $parts[0];
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$table->name = $parts[1];
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$table->fullName = $table->schemaName . '.' . $table->name;
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} else {
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$table->fullName = $table->name = $parts[0];
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}
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}
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/**
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* Loads the column information into a [[ColumnSchema]] object.
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* @param array $info column information
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* @return ColumnSchema the column schema object
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*/
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protected function loadColumnSchema($info)
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{
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$column = $this->createColumnSchema();
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$column->name = $info['field'];
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$column->allowNull = $info['null'] === 'YES';
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$column->isPrimaryKey = strpos($info['key'], 'PRI') !== false;
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$column->autoIncrement = stripos($info['extra'], 'auto_increment') !== false;
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$column->comment = $info['comment'];
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$column->dbType = $info['type'];
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$column->unsigned = stripos($column->dbType, 'unsigned') !== false;
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$column->type = self::TYPE_STRING;
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if (preg_match('/^(\w+)(?:\(([^\)]+)\))?/', $column->dbType, $matches)) {
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$type = strtolower($matches[1]);
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if (isset($this->typeMap[$type])) {
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$column->type = $this->typeMap[$type];
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}
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if (!empty($matches[2])) {
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if ($type === 'enum') {
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preg_match_all("/'[^']*'/", $matches[2], $values);
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foreach ($values[0] as $i => $value) {
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$values[$i] = trim($value, "'");
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}
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$column->enumValues = $values;
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} else {
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$values = explode(',', $matches[2]);
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$column->size = $column->precision = (int) $values[0];
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if (isset($values[1])) {
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$column->scale = (int) $values[1];
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}
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if ($column->size === 1 && $type === 'bit') {
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$column->type = 'boolean';
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} elseif ($type === 'bit') {
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if ($column->size > 32) {
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$column->type = 'bigint';
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} elseif ($column->size === 32) {
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$column->type = 'integer';
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}
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}
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}
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}
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}
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$column->phpType = $this->getColumnPhpType($column);
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if (!$column->isPrimaryKey) {
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/**
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* When displayed in the INFORMATION_SCHEMA.COLUMNS table, a default CURRENT TIMESTAMP is displayed
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* as CURRENT_TIMESTAMP up until MariaDB 10.2.2, and as current_timestamp() from MariaDB 10.2.3.
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*
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* See details here: https://mariadb.com/kb/en/library/now/#description
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*/
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if (in_array($column->type, ['timestamp', 'datetime', 'date', 'time'])
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&& isset($info['default'])
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&& preg_match('/^current_timestamp(?:\(([0-9]*)\))?$/i', $info['default'], $matches)) {
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$column->defaultValue = new Expression('CURRENT_TIMESTAMP' . (!empty($matches[1]) ? '(' . $matches[1] . ')' : ''));
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} elseif (isset($type) && $type === 'bit') {
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$column->defaultValue = bindec(trim(isset($info['default']) ? $info['default'] : '', 'b\''));
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} else {
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$column->defaultValue = $column->phpTypecast($info['default']);
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}
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}
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return $column;
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}
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/**
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* Collects the metadata of table columns.
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* @param TableSchema $table the table metadata
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* @return bool whether the table exists in the database
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* @throws \Exception if DB query fails
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*/
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protected function findColumns($table)
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{
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$sql = 'SHOW FULL COLUMNS FROM ' . $this->quoteTableName($table->fullName);
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try {
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$columns = $this->db->createCommand($sql)->queryAll();
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} catch (\Exception $e) {
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$previous = $e->getPrevious();
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if ($previous instanceof \PDOException && strpos($previous->getMessage(), 'SQLSTATE[42S02') !== false) {
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// table does not exist
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// https://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html#error_er_bad_table_error
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return false;
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}
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throw $e;
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}
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foreach ($columns as $info) {
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if ($this->db->slavePdo->getAttribute(\PDO::ATTR_CASE) !== \PDO::CASE_LOWER) {
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$info = array_change_key_case($info, CASE_LOWER);
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}
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$column = $this->loadColumnSchema($info);
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$table->columns[$column->name] = $column;
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if ($column->isPrimaryKey) {
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$table->primaryKey[] = $column->name;
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if ($column->autoIncrement) {
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$table->sequenceName = '';
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}
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}
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}
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return true;
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}
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/**
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* Gets the CREATE TABLE sql string.
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* @param TableSchema $table the table metadata
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* @return string $sql the result of 'SHOW CREATE TABLE'
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*/
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protected function getCreateTableSql($table)
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{
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$row = $this->db->createCommand('SHOW CREATE TABLE ' . $this->quoteTableName($table->fullName))->queryOne();
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if (isset($row['Create Table'])) {
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$sql = $row['Create Table'];
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} else {
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$row = array_values($row);
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$sql = $row[1];
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}
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return $sql;
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}
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/**
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* Collects the foreign key column details for the given table.
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* @param TableSchema $table the table metadata
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* @throws \Exception
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*/
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protected function findConstraints($table)
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{
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$sql = <<<'SQL'
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SELECT
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`kcu`.`CONSTRAINT_NAME` AS `constraint_name`,
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`kcu`.`COLUMN_NAME` AS `column_name`,
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`kcu`.`REFERENCED_TABLE_NAME` AS `referenced_table_name`,
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`kcu`.`REFERENCED_COLUMN_NAME` AS `referenced_column_name`
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FROM `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`
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JOIN `information_schema`.`KEY_COLUMN_USAGE` AS `kcu` ON
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(
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`kcu`.`CONSTRAINT_CATALOG` = `rc`.`CONSTRAINT_CATALOG` OR
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(`kcu`.`CONSTRAINT_CATALOG` IS NULL AND `rc`.`CONSTRAINT_CATALOG` IS NULL)
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) AND
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`kcu`.`CONSTRAINT_SCHEMA` = `rc`.`CONSTRAINT_SCHEMA` AND
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`kcu`.`CONSTRAINT_NAME` = `rc`.`CONSTRAINT_NAME`
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WHERE `rc`.`CONSTRAINT_SCHEMA` = database() AND `kcu`.`TABLE_SCHEMA` = database()
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AND `rc`.`TABLE_NAME` = :tableName AND `kcu`.`TABLE_NAME` = :tableName1
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SQL;
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try {
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$rows = $this->db->createCommand($sql, [':tableName' => $table->name, ':tableName1' => $table->name])->queryAll();
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$constraints = [];
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foreach ($rows as $row) {
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$constraints[$row['constraint_name']]['referenced_table_name'] = $row['referenced_table_name'];
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$constraints[$row['constraint_name']]['columns'][$row['column_name']] = $row['referenced_column_name'];
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}
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$table->foreignKeys = [];
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foreach ($constraints as $name => $constraint) {
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$table->foreignKeys[$name] = array_merge(
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[$constraint['referenced_table_name']],
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$constraint['columns']
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);
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}
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} catch (\Exception $e) {
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$previous = $e->getPrevious();
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if (!$previous instanceof \PDOException || strpos($previous->getMessage(), 'SQLSTATE[42S02') === false) {
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throw $e;
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}
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// table does not exist, try to determine the foreign keys using the table creation sql
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$sql = $this->getCreateTableSql($table);
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$regexp = '/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';
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if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
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foreach ($matches as $match) {
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$fks = array_map('trim', explode(',', str_replace(['`', '"'], '', $match[1])));
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$pks = array_map('trim', explode(',', str_replace(['`', '"'], '', $match[3])));
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$constraint = [str_replace(['`', '"'], '', $match[2])];
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foreach ($fks as $k => $name) {
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$constraint[$name] = $pks[$k];
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}
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$table->foreignKeys[md5(serialize($constraint))] = $constraint;
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}
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$table->foreignKeys = array_values($table->foreignKeys);
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}
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}
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}
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/**
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* Returns all unique indexes for the given table.
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*
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* Each array element is of the following structure:
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*
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* ```php
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* [
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* 'IndexName1' => ['col1' [, ...]],
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* 'IndexName2' => ['col2' [, ...]],
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* ]
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* ```
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*
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* @param TableSchema $table the table metadata
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* @return array all unique indexes for the given table.
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*/
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public function findUniqueIndexes($table)
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{
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$sql = $this->getCreateTableSql($table);
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$uniqueIndexes = [];
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$regexp = '/UNIQUE KEY\s+[`"](.+)[`"]\s*\(([`"].+[`"])+\)/mi';
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if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
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foreach ($matches as $match) {
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$indexName = $match[1];
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$indexColumns = array_map('trim', preg_split('/[`"],[`"]/', trim($match[2], '`"')));
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$uniqueIndexes[$indexName] = $indexColumns;
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}
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}
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return $uniqueIndexes;
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}
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/**
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* {@inheritdoc}
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*/
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public function createColumnSchemaBuilder($type, $length = null)
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{
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return Yii::createObject(ColumnSchemaBuilder::className(), [$type, $length, $this->db]);
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}
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/**
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* @return bool whether the version of the MySQL being used is older than 5.1.
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* @throws InvalidConfigException
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* @throws Exception
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* @since 2.0.13
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*/
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protected function isOldMysql()
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{
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if ($this->_oldMysql === null) {
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$version = $this->db->getSlavePdo(true)->getAttribute(\PDO::ATTR_SERVER_VERSION);
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$this->_oldMysql = version_compare($version, '5.1', '<=');
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}
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return $this->_oldMysql;
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}
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/**
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* Loads multiple types of constraints and returns the specified ones.
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* @param string $tableName table name.
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* @param string $returnType return type:
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* - primaryKey
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* - foreignKeys
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* - uniques
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* @return mixed constraints.
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*/
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private function loadTableConstraints($tableName, $returnType)
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{
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static $sql = <<<'SQL'
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SELECT
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`kcu`.`CONSTRAINT_NAME` AS `name`,
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`kcu`.`COLUMN_NAME` AS `column_name`,
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`tc`.`CONSTRAINT_TYPE` AS `type`,
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CASE
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WHEN :schemaName IS NULL AND `kcu`.`REFERENCED_TABLE_SCHEMA` = DATABASE() THEN NULL
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ELSE `kcu`.`REFERENCED_TABLE_SCHEMA`
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END AS `foreign_table_schema`,
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`kcu`.`REFERENCED_TABLE_NAME` AS `foreign_table_name`,
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`kcu`.`REFERENCED_COLUMN_NAME` AS `foreign_column_name`,
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`rc`.`UPDATE_RULE` AS `on_update`,
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`rc`.`DELETE_RULE` AS `on_delete`,
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`kcu`.`ORDINAL_POSITION` AS `position`
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FROM
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`information_schema`.`KEY_COLUMN_USAGE` AS `kcu`,
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`information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`,
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`information_schema`.`TABLE_CONSTRAINTS` AS `tc`
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WHERE
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`kcu`.`TABLE_SCHEMA` = COALESCE(:schemaName1, DATABASE()) AND `kcu`.`CONSTRAINT_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `kcu`.`TABLE_NAME` = :tableName
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AND `rc`.`CONSTRAINT_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `rc`.`TABLE_NAME` = :tableName1 AND `rc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME`
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AND `tc`.`TABLE_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `tc`.`TABLE_NAME` = :tableName2 AND `tc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME` AND `tc`.`CONSTRAINT_TYPE` = 'FOREIGN KEY'
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UNION
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SELECT
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`kcu`.`CONSTRAINT_NAME` AS `name`,
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`kcu`.`COLUMN_NAME` AS `column_name`,
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`tc`.`CONSTRAINT_TYPE` AS `type`,
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NULL AS `foreign_table_schema`,
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NULL AS `foreign_table_name`,
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NULL AS `foreign_column_name`,
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NULL AS `on_update`,
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NULL AS `on_delete`,
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`kcu`.`ORDINAL_POSITION` AS `position`
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FROM
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`information_schema`.`KEY_COLUMN_USAGE` AS `kcu`,
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`information_schema`.`TABLE_CONSTRAINTS` AS `tc`
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WHERE
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`kcu`.`TABLE_SCHEMA` = COALESCE(:schemaName2, DATABASE()) AND `kcu`.`TABLE_NAME` = :tableName3
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AND `tc`.`TABLE_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `tc`.`TABLE_NAME` = :tableName4 AND `tc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME` AND `tc`.`CONSTRAINT_TYPE` IN ('PRIMARY KEY', 'UNIQUE')
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ORDER BY `position` ASC
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SQL;
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$resolvedName = $this->resolveTableName($tableName);
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$constraints = $this->db->createCommand($sql, [
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':schemaName' => $resolvedName->schemaName,
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':schemaName1' => $resolvedName->schemaName,
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':schemaName2' => $resolvedName->schemaName,
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':tableName' => $resolvedName->name,
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':tableName1' => $resolvedName->name,
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':tableName2' => $resolvedName->name,
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':tableName3' => $resolvedName->name,
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':tableName4' => $resolvedName->name
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])->queryAll();
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$constraints = $this->normalizePdoRowKeyCase($constraints, true);
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$constraints = ArrayHelper::index($constraints, null, ['type', 'name']);
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$result = [
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'primaryKey' => null,
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'foreignKeys' => [],
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'uniques' => [],
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];
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foreach ($constraints as $type => $names) {
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foreach ($names as $name => $constraint) {
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switch ($type) {
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case 'PRIMARY KEY':
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$result['primaryKey'] = new Constraint([
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'columnNames' => ArrayHelper::getColumn($constraint, 'column_name'),
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]);
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break;
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case 'FOREIGN KEY':
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$result['foreignKeys'][] = new ForeignKeyConstraint([
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'name' => $name,
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'columnNames' => ArrayHelper::getColumn($constraint, 'column_name'),
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'foreignSchemaName' => $constraint[0]['foreign_table_schema'],
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'foreignTableName' => $constraint[0]['foreign_table_name'],
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'foreignColumnNames' => ArrayHelper::getColumn($constraint, 'foreign_column_name'),
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'onDelete' => $constraint[0]['on_delete'],
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'onUpdate' => $constraint[0]['on_update'],
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]);
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break;
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case 'UNIQUE':
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$result['uniques'][] = new Constraint([
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'name' => $name,
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'columnNames' => ArrayHelper::getColumn($constraint, 'column_name'),
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]);
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break;
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}
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}
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}
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foreach ($result as $type => $data) {
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$this->setTableMetadata($tableName, $type, $data);
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}
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return $result[$returnType];
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}
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}
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