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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\db\TableSchema;
use yii\db\ColumnSchema;
/**
* 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
{
/**
* @var array mapping from physical column types (keys) to abstract column types (values)
*/
public $typeMap = array(
'tinyint' => self::TYPE_SMALLINT,
'bit' => self::TYPE_SMALLINT,
'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_FLOAT,
'real' => self::TYPE_FLOAT,
'decimal' => self::TYPE_DECIMAL,
'numeric' => self::TYPE_DECIMAL,
'tinytext' => self::TYPE_TEXT,
'mediumtext' => self::TYPE_TEXT,
'longtext' => self::TYPE_TEXT,
'text' => self::TYPE_TEXT,
'varchar' => self::TYPE_STRING,
'string' => self::TYPE_STRING,
'char' => self::TYPE_STRING,
'datetime' => self::TYPE_DATETIME,
'year' => self::TYPE_DATE,
'date' => self::TYPE_DATE,
'time' => self::TYPE_TIME,
'timestamp' => self::TYPE_TIMESTAMP,
'enum' => self::TYPE_STRING,
);
/**
* Quotes a table name for use in a query.
* A simple table name has no schema prefix.
* @param string $name table name
* @return string the properly quoted table name
*/
public function quoteSimpleTableName($name)
{
return strpos($name, "`") !== false ? $name : "`" . $name . "`";
}
/**
* Quotes a column name for use in a query.
* A simple column name has no prefix.
* @param string $name column name
* @return string the properly quoted column name
*/
public function quoteSimpleColumnName($name)
{
return strpos($name, '`') !== false || $name === '*' ? $name : '`' . $name . '`';
}
/**
* Creates a query builder for the MySQL database.
* @return QueryBuilder query builder instance
*/
public function createQueryBuilder()
{
return new QueryBuilder($this->db);
}
/**
* Loads the metadata for the specified table.
* @param string $name table name
* @return TableSchema driver dependent table metadata. Null if the table does not exist.
*/
protected function loadTableSchema($name)
{
$table = new TableSchema;
$this->resolveTableNames($table, $name);
if ($this->findColumns($table)) {
$this->findConstraints($table);
return $table;
} else {
return null;
}
}
/**
* 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];
} else {
$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 = new ColumnSchema;
$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'];
$column->unsigned = strpos($column->dbType, 'unsigned') !== false;
$column->type = self::TYPE_STRING;
if (preg_match('/^(\w+)(?:\(([^\)]+)\))?/', $column->dbType, $matches)) {
$type = $matches[1];
if (isset($this->typeMap[$type])) {
$column->type = $this->typeMap[$type];
}
if (!empty($matches[2])) {
if ($type === 'enum') {
$values = explode(',', $matches[2]);
foreach ($values 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 === 'tinyint' || $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->type !== 'timestamp' || $info['Default'] !== 'CURRENT_TIMESTAMP') {
$column->defaultValue = $column->typecast($info['Default']);
}
return $column;
}
/**
* Collects the metadata of table columns.
* @param TableSchema $table the table metadata
* @return boolean whether the table exists in the database
* @throws \Exception if DB query fails
*/
protected function findColumns($table)
{
$sql = 'SHOW FULL COLUMNS FROM ' . $this->quoteSimpleTableName($table->name);
try {
$columns = $this->db->createCommand($sql)->queryAll();
} catch (\Exception $e) {
$previous = $e->getPrevious();
if ($previous instanceof \PDOException && $previous->getCode() == '42S02') {
// table does not exist
return false;
}
throw $e;
}
foreach ($columns as $info) {
$column = $this->loadColumnSchema($info);
$table->columns[$column->name] = $column;
if ($column->isPrimaryKey) {
$table->primaryKey[] = $column->name;
if ($column->autoIncrement) {
$table->sequenceName = '';
}
}
}
return true;
}
/**
* Collects the foreign key column details for the given table.
* @param TableSchema $table the table metadata
*/
protected function findConstraints($table)
{
$row = $this->db->createCommand('SHOW CREATE TABLE ' . $this->quoteSimpleTableName($table->name))->queryRow();
if (isset($row['Create Table'])) {
$sql = $row['Create Table'];
} else {
$row = array_values($row);
$sql = $row[1];
}
$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 = array(str_replace('`', '', $match[2]));
foreach ($fks as $k => $name) {
$constraint[$name] = $pks[$k];
}
$table->foreignKeys[] = $constraint;
}
}
}
/**
* Returns all table names in the database.
* This method should be overridden by child classes in order to support this feature
* because the default implementation simply throws an exception.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
* @return array all table names in the database. The names have NO the schema name prefix.
*/
protected function findTableNames($schema = '')
{
$sql = 'SHOW TABLES';
if ($schema !== '') {
$sql .= ' FROM ' . $this->quoteSimpleTableName($schema);
}
return $this->db->createCommand($sql)->queryColumn();
}
}