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<?php
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/**
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* Schema class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2012 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db\dao\mysql;
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/**
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* Schema is the class for retrieving metadata information 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\dao\Schema
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{
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/**
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* Quotes a table name for use in a query.
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* A simple table name does not schema prefix.
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* @param string $name table name
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* @return string the properly quoted table name
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*/
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public function quoteSimpleTableName($name)
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{
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return strpos($name, "`") !== false ? $name : "`" . $name . "`";
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}
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/**
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* Quotes a column name for use in a query.
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* A simple column name does not contain prefix.
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* @param string $name column name
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* @return string the properly quoted column name
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*/
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public function quoteSimpleColumnName($name)
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{
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return strpos($name, '`') !== false || $name === '*' ? $name : '`' . $name . '`';
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}
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/**
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* Loads the metadata for the specified table.
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* @param string $name table name
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* @return TableSchema driver dependent table metadata. Null if the table does not exist.
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*/
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protected function loadTableSchema($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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}
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/**
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* Generates various kinds of table names.
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* @param CMysqlTableSchema $table the table instance
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* @param string $name the unquoted table name
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*/
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protected function resolveTableNames($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->quotedName = $this->quoteSimpleTableName($table->schemaName) . '.' . $this->quoteSimpleTableName($table->name);
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}
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else {
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$table->name = $parts[0];
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$table->quotedName = $this->quoteSimpleTableName($table->name);
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}
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}
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/**
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* Creates a table column.
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* @param array $column column metadata
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* @return CDbColumnSchema normalized column metadata
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*/
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protected function createColumn($column)
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{
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$c = new ColumnSchema;
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$c->name = $column['Field'];
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$c->quotedName = $this->quoteSimpleColumnName($c->name);
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$c->allowNull = $column['Null'] === 'YES';
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$c->isPrimaryKey = strpos($column['Key'], 'PRI') !== false;
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$c->autoIncrement = stripos($column['Extra'], 'auto_increment') !== false;
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$c->initTypes($column['Type']);
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$c->initDefaultValue($column['Default']);
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return $c;
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}
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/**
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* Collects the table column metadata.
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* @param CMysqlTableSchema $table the table metadata
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* @return boolean whether the table exists in the database
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*/
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protected function findColumns($table)
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{
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$sql = 'SHOW COLUMNS FROM ' . $table->quotedName;
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try {
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$columns = $this->connection->createCommand($sql)->queryAll();
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}
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catch(\Exception $e) {
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return false;
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}
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foreach ($columns as $column) {
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$table->columns[$c->name] = $c = $this->createColumn($column);
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if ($c->isPrimaryKey) {
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if ($table->primaryKey === null) {
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$table->primaryKey = $c->name;
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}
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elseif (is_string($table->primaryKey)) {
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$table->primaryKey = array($table->primaryKey, $c->name);
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}
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else {
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$table->primaryKey[] = $c->name;
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}
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if ($c->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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* Collects the foreign key column details for the given table.
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* @param CMysqlTableSchema $table the table metadata
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*/
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protected function findConstraints($table)
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{
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$row = $this->connection->createCommand('SHOW CREATE TABLE ' . $table->quotedName)->queryRow();
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$matches = array();
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$regexp = '/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';
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foreach ($row as $sql) {
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if (preg_match_all($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 = array(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[] = $constraint;
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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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/**
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* Returns all table names in the database.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @return array all table names in the database.
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*/
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protected function findTableNames($schema = '')
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{
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if ($schema === '') {
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return $this->connection->createCommand('SHOW TABLES')->queryColumn();
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}
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$names = $this->connection->createCommand('SHOW TABLES FROM ' . $this->quoteSimpleTableName($schema))->queryColumn();
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foreach ($names as &$name) {
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$name = $schema . '.' . $name;
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}
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return $names;
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}
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}
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