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