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276 lines
7.4 KiB
PHP
276 lines
7.4 KiB
PHP
<?php
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/**
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* COciSchema class file.
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*
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* @author Ricardo Grana <rickgrana@yahoo.com.br>
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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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* COciSchema is the class for retrieving metadata information from a PostgreSQL database.
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*
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* @author Ricardo Grana <qiang.xue@gmail.com>
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* @version $Id: COciSchema.php 1108 2009-06-09 01:48:40Z qiang.xue $
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* @package system.db.schema.oci
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* @since 1.0.5
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*/
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class COciSchema extends CDbSchema
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{
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private $_defaultSchema = '';
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private $_sequences=array();
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/**
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* Quotes a table name for use in a query.
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* @param string table name
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* @return string the properly quoted table name
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*/
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public function quoteTableName($name)
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{
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return $name;
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}
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/**
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* Quotes a column name for use in a query.
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* @param string column name
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* @return string the properly quoted column name
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*/
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public function quoteColumnName($name)
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{
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return $name;
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}
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/**
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* Creates a command builder for the database.
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* This method may be overridden by child classes to create a DBMS-specific command builder.
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* @return CDbCommandBuilder command builder instance
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*/
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protected function createCommandBuilder()
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{
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return new COciCommandBuilder($this);
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}
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/**
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* @param string default schema.
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*/
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public function setDefaultSchema($schema)
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{
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$this->_defaultSchema=$schema;
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}
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/**
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* @return string default schema.
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*/
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public function getDefaultSchema()
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{
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if (!strlen($this->_defaultSchema))
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{
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$this->setDefaultSchema(strtoupper($this->getDbConnection()->username));
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}
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return $this->_defaultSchema;
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}
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/**
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* @param string table name with optional schema name prefix, uses default schema name prefix is not provided.
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* @return array tuple as ($schemaName,$tableName)
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*/
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protected function getSchemaTableName($table)
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{
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$table = strtoupper($table);
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if(count($parts= explode('.', str_replace('"','',$table))) > 1)
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return array($parts[0], $parts[1]);
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else
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return array($this->getDefaultSchema(),$parts[0]);
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}
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/**
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* Creates a table instance representing the metadata for the named table.
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* @return CDbTableSchema driver dependent table metadata.
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*/
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protected function createTable($name)
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{
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$table=new COciTableSchema;
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$this->resolveTableNames($table,$name);
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if(!$this->findColumns($table))
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return null;
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$this->findConstraints($table);
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return $table;
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}
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/**
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* Generates various kinds of table names.
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* @param COciTableSchema the table instance
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* @param string the unquoted table name
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*/
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protected function resolveTableNames($table,$name)
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{
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$parts=explode('.',str_replace('"','',$name));
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if(isset($parts[1]))
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{
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$schemaName=$parts[0];
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$tableName=$parts[1];
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}
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else
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{
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$schemaName=$this->getDefaultSchema();
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$tableName=$parts[0];
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}
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$table->name=$tableName;
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$table->schemaName=$schemaName;
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if($schemaName===$this->getDefaultSchema())
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$table->rawName=$this->quoteTableName($tableName);
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else
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$table->rawName=$this->quoteTableName($schemaName).'.'.$this->quoteTableName($tableName);
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}
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/**
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* Collects the table column metadata.
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* @param COciTableSchema 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($table)
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{
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list($schemaName,$tableName) = $this->getSchemaTableName($table->name);
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$sql=<<<EOD
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SELECT a.column_name, a.data_type ||
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case
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when data_precision is not null
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then '(' || a.data_precision ||
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case when a.data_scale > 0 then ',' || a.data_scale else '' end
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|| ')'
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when data_type = 'DATE' then ''
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else '(' || to_char(a.data_length) || ')'
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end as data_type,
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a.nullable, a.data_default,
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( SELECT D.constraint_type
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FROM ALL_CONS_COLUMNS C
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inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
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WHERE C.OWNER = B.OWNER
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and C.table_name = B.object_name
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and C.column_name = A.column_name
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and D.constraint_type = 'P') as Key
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FROM ALL_TAB_COLUMNS A
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inner join ALL_OBJECTS B ON b.owner = a.owner and ltrim(B.OBJECT_NAME) = ltrim(A.TABLE_NAME)
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WHERE
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a.owner = '{$schemaName}'
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and b.object_type = 'TABLE'
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and b.object_name = '{$tableName}'
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ORDER by a.column_id
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EOD;
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$command=$this->getDbConnection()->createCommand($sql);
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if(($columns=$command->queryAll())===array()){
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return false;
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}
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foreach($columns as $column)
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{
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$c=$this->createColumn($column);
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$table->columns[$c->name]=$c;
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if($c->isPrimaryKey)
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{
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if($table->primaryKey===null)
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$table->primaryKey=$c->name;
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else if(is_string($table->primaryKey))
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$table->primaryKey=array($table->primaryKey,$c->name);
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else
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$table->primaryKey[]=$c->name;
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}
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}
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return true;
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}
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/**
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* Creates a table column.
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* @param array column metadata
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* @return CDbColumnSchema normalized column metadata
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*/
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protected function createColumn($column)
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{
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$c=new COciColumnSchema;
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$c->name=$column['COLUMN_NAME'];
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$c->rawName=$this->quoteColumnName($c->name);
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$c->allowNull=$column['NULLABLE']==='Y';
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$c->isPrimaryKey=strpos($column['KEY'],'P')!==false;
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$c->isForeignKey=false;
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$c->init($column['DATA_TYPE'],$column['DATA_DEFAULT']);
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return $c;
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}
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/**
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* Collects the primary and foreign key column details for the given table.
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* @param COciTableSchema the table metadata
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*/
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protected function findConstraints($table)
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{
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$sql=<<<EOD
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SELECT D.constraint_type as CONSTRAINT_TYPE, C.COLUMN_NAME, C.position, D.r_constraint_name,
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E.table_name as table_ref, f.column_name as column_ref
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FROM ALL_CONS_COLUMNS C
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inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
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left join ALL_constraints E on E.OWNER = D.r_OWNER and E.constraint_name = D.r_constraint_name
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left join ALL_cons_columns F on F.OWNER = E.OWNER and F.constraint_name = E.constraint_name and F.position = c.position
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WHERE C.OWNER = '{$table->schemaName}'
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and C.table_name = '{$table->name}'
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and D.constraint_type <> 'P'
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order by d.constraint_name, c.position
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EOD;
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$command=$this->getDbConnection()->createCommand($sql);
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foreach($command->queryAll() as $row)
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{
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if($row['CONSTRAINT_TYPE']==='R') // foreign key
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{
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$name = $row["COLUMN_NAME"];
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$table->foreignKeys[$name]=array($row["TABLE_REF"], array($row["COLUMN_REF"]));
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if(isset($table->columns[$name]))
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$table->columns[$name]->isForeignKey=true;
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}
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}
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}
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/**
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* Returns all table names in the database.
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* @return array all table names in the database.
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*/
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protected function findTableNames($schema='')
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{
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if($schema==='')
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{
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$sql=<<<EOD
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SELECT table_name, '{$schema}' as table_schema FROM user_tables
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EOD;
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$command=$this->getDbConnection()->createCommand($sql);
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}
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else
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{
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$sql=<<<EOD
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SELECT object_name as table_name, owner as table_schema FROM all_objects
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WHERE object_type = 'TABLE' AND owner=:schema
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EOD;
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$command=$this->getDbConnection()->createCommand($sql);
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$command->bindParam(':schema',$schema);
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}
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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===$this->getDefaultSchema())
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$names[]=$row['table_name'];
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else
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$names[]=$row['schema_name'].'.'.$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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