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310 lines
9.3 KiB
PHP
310 lines
9.3 KiB
PHP
<?php
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/**
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* CMssqlSchema class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Christophe Boulain <Christophe.Boulain@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2009 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CMssqlSchema is the class for retrieving metadata information from a MS SQL Server database.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @author Christophe Boulain <Christophe.Boulain@gmail.com>
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* @version $Id: CMssqlSchema.php 1197 2009-06-30 23:31:52Z qiang.xue $
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* @package system.db.schema.mssql
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* @since 1.0.4
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*/
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class CMssqlSchema extends CDbSchema
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{
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const DEFAULT_SCHEMA='dbo';
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/**
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* Quotes a table name for use in a query.
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* @param string table name
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* @return string the properly quoted table name
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*/
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public function quoteTableName($name)
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{
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if (strpos($name,'.')===false)
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return '['.$name.']';
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$names=explode('.',$name);
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foreach ($names as &$n)
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$n = '['.$n.']';
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return implode('.',$names);
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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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* @param string column name
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* @return string the properly quoted column name
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*/
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public function quoteColumnName($name)
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{
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return '['.$name.']';
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}
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/**
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* Compares two table names.
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* The table names can be either quoted or unquoted. This method
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* will consider both cases.
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* @param string table name 1
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* @param string table name 2
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* @return boolean whether the two table names refer to the same table.
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*/
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public function compareTableNames($name1,$name2)
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{
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$name1=str_replace(array('[',']'),'',$name1);
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$name1=str_replace(array('[',']'),'',$name2);
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return parent::compareTableNames(strtolower($name1),strtolower($name2));
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}
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/**
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* Creates a table instance representing the metadata for the named table.
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* @return CMssqlTableSchema driver dependent table metadata. Null if the table does not exist.
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*/
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protected function createTable($name)
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{
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$table=new CMssqlTableSchema;
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$this->resolveTableNames($table,$name);
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//if (!in_array($table->name, $this->tableNames)) return null;
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$table->primaryKey=$this->findPrimaryKey($table);
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$table->foreignKeys=$this->findForeignKeys($table);
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if($this->findColumns($table))
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{
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return $table;
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}
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else
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return null;
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}
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/**
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* Generates various kinds of table names.
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* @param CMssqlTableSchema the table instance
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* @param string the unquoted table name
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*/
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protected function resolveTableNames($table,$name)
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{
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$parts=explode('.',str_replace(array('[',']'),'',$name));
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if(($c=count($parts))==3)
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{
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// Catalog name, schema name and table name provided
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$table->catalogName=$parts[0];
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$table->schemaName=$parts[1];
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$table->name=$parts[2];
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$table->rawName=$this->quoteTableName($table->catalogName).'.'.$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
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}
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elseif ($c==2)
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{
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// Only schema name and table name provided
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$table->name=$parts[1];
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$table->schemaName=$parts[0];
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$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
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}
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else
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{
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// Only the name given, we need to get at least the schema name
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//if (empty($this->_schemaNames)) $this->findTableNames();
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$table->name=$parts[0];
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$table->schemaName=self::DEFAULT_SCHEMA;
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$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
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}
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}
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/**
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* Gets the primary key column(s) details for the given table.
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* @param CMssqlTableSchema table
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* @return mixed primary keys (null if no pk, string if only 1 column pk, or array if composite pk)
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*/
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protected function findPrimaryKey($table)
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{
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$kcu='INFORMATION_SCHEMA.KEY_COLUMN_USAGE';
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$tc='INFORMATION_SCHEMA.TABLE_CONSTRAINTS';
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if (isset($table->catalogName))
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{
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$kcu=$table->catalogName.'.'.$kcu;
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$tc=$table->catalogName.'.'.$tc;
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}
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$sql = <<<EOD
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SELECT k.column_name field_name
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FROM {$this->quoteTableName($kcu)} k
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LEFT JOIN {$this->quoteTableName($tc)} c
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ON k.table_name = c.table_name
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AND k.constraint_name = c.constraint_name
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WHERE c.constraint_type ='PRIMARY KEY'
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AND k.table_name = :table
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AND k.table_schema = :schema
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EOD;
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$command = $this->getDbConnection()->createCommand($sql);
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$command->bindValue(':table', $table->name);
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$command->bindValue(':schema', $table->schemaName);
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$primary=$command->queryColumn();
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switch (count($primary))
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{
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case 0: // No primary key on table
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$primary=null;
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break;
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case 1: // Only 1 primary key
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$primary=$primary[0];
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break;
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}
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return $primary;
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}
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/**
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* Gets foreign relationship constraint keys and table name
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* @param CMssqlTableSchema table
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* @return array foreign relationship table name and keys.
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*/
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protected function findForeignKeys($table)
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{
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$rc='INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS';
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$kcu='INFORMATION_SCHEMA.KEY_COLUMN_USAGE';
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if (isset($table->catalogName))
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{
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$kcu=$table->catalogName.'.'.$kcu;
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$rc=$table->catalogName.'.'.$rc;
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}
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//From http://msdn2.microsoft.com/en-us/library/aa175805(SQL.80).aspx
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$sql = <<<EOD
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SELECT
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KCU1.CONSTRAINT_NAME AS 'FK_CONSTRAINT_NAME'
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, KCU1.TABLE_NAME AS 'FK_TABLE_NAME'
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, KCU1.COLUMN_NAME AS 'FK_COLUMN_NAME'
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, KCU1.ORDINAL_POSITION AS 'FK_ORDINAL_POSITION'
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, KCU2.CONSTRAINT_NAME AS 'UQ_CONSTRAINT_NAME'
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, KCU2.TABLE_NAME AS 'UQ_TABLE_NAME'
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, KCU2.COLUMN_NAME AS 'UQ_COLUMN_NAME'
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, KCU2.ORDINAL_POSITION AS 'UQ_ORDINAL_POSITION'
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FROM {$this->quoteTableName($rc)} RC
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JOIN {$this->quoteTableName($kcu)} KCU1
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ON KCU1.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG
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AND KCU1.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA
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AND KCU1.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
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JOIN {$this->quoteTableName($kcu)} KCU2
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ON KCU2.CONSTRAINT_CATALOG =
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RC.UNIQUE_CONSTRAINT_CATALOG
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AND KCU2.CONSTRAINT_SCHEMA =
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RC.UNIQUE_CONSTRAINT_SCHEMA
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AND KCU2.CONSTRAINT_NAME =
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RC.UNIQUE_CONSTRAINT_NAME
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AND KCU2.ORDINAL_POSITION = KCU1.ORDINAL_POSITION
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WHERE KCU1.TABLE_NAME = :table
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EOD;
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$command = $this->getDbConnection()->createCommand($sql);
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$command->bindValue(':table', $table->name);
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$fkeys=array();
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foreach($command->queryAll() as $info)
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{
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$fkeys[$info['FK_COLUMN_NAME']]=array($info['UQ_TABLE_NAME'],$info['UQ_COLUMN_NAME'],);
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}
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return $fkeys;
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}
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/**
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* Collects the table column metadata.
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* @param CMssqlTableSchema the table metadata
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* @return boolean whether the table exists in the database
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*/
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protected function findColumns($table)
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{
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$where=array();
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$where[]="TABLE_NAME='".$table->name."'";
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if (isset($table->catalogName))
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$where[]="TABLE_CATALOG='".$table->catalogName."'";
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if (isset($table->schemaName))
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$where[]="TABLE_SCHEMA='".$table->schemaName."'";
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$sql="SELECT *, columnproperty(object_id(table_schema+'.'+table_name), column_name, 'IsIdentity') as IsIdentity ".
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"FROM INFORMATION_SCHEMA.COLUMNS WHERE ".join(' AND ',$where);
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if (($columns=$this->getDbConnection()->createCommand($sql)->queryAll())===array())
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return false;
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foreach($columns as $column)
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{
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$c=$this->createColumn($column);
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if (is_array($table->primaryKey))
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$c->isPrimaryKey=in_array($c->name, $table->primaryKey);
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else
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$c->isPrimaryKey=strcasecmp($c->name,$table->primaryKey)===0;
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$c->isForeignKey=isset($table->foreignKeys[$c->name]);
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$table->columns[$c->name]=$c;
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if ($column['IsIdentity']==1 && $table->sequenceName===null)
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$table->sequenceName='';
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}
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return true;
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}
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/**
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* Creates a table column.
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* @param array 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 CMssqlColumnSchema;
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$c->name=$column['COLUMN_NAME'];
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$c->rawName=$this->quoteColumnName($c->name);
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$c->allowNull=$column['IS_NULLABLE']=='YES';
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if ($column['NUMERIC_PRECISION_RADIX']!==null)
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{
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// We have a numeric datatype
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$c->size=$c->precision=$column['NUMERIC_PRECISION']!==null?(int)$column['NUMERIC_PRECISION']:null;
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$c->scale=$column['NUMERIC_SCALE']!==null?(int)$column['NUMERIC_SCALE']:null;
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}
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elseif ($column['DATA_TYPE']=='image' || $column['DATA_TYPE']=='text')
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$c->size=$c->precision=null;
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else
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$c->size=$c->precision=($column['CHARACTER_MAXIMUM_LENGTH']!== null)?(int)$column['CHARACTER_MAXIMUM_LENGTH']:null;
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$c->init($column['DATA_TYPE'],$column['COLUMN_DEFAULT']);
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return $c;
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}
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/**
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* Returns all table names in the database.
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* @return array all table names in the database.
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* @since 1.0.4
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*/
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protected function findTableNames($schema='')
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{
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if($schema==='')
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$schema=self::DEFAULT_SCHEMA;
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$sql=<<<EOD
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SELECT TABLE_NAME, TABLE_SCHEMA FROM [INFORMATION_SCHEMA].[TABLES]
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WHERE TABLE_TYPE='BASE TABLE' AND TABLE_SCHEMA=:schema
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EOD;
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$command=$this->getDbConnection()->createCommand($sql);
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$command->bindParam(":schema", $schema);
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$rows=$command->queryAll();
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$names=array();
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foreach ($rows as $row)
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{
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if ($schema == self::DEFAULT_SCHEMA)
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$names[]=$row['TABLE_NAME'];
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else
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$names[]=$schema.'.'.$row['TABLE_SCHEMA'].'.'.$row['TABLE_NAME'];
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}
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return $names;
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}
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/**
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* Creates a command builder for the database.
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* This method overrides parent implementation in order to create a MSSQL specific command builder
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* @return CDbCommandBuilder command builder instance
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*/
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protected function createCommandBuilder()
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{
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return new CMssqlCommandBuilder($this);
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}
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}
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