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<?php
/**
* COciSchema class file.
*
* @author Ricardo Grana <rickgrana@yahoo.com.br>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* COciSchema is the class for retrieving metadata information from a PostgreSQL database.
*
* @author Ricardo Grana <rickgrana@yahoo.com.br>
* @version $Id: COciSchema.php 1439 2009-10-07 23:51:47Z qiang.xue $
* @package system.db.schema.oci
* @since 1.0.5
*/
class COciSchema extends CDbSchema
{
private $_defaultSchema = '';
private $_sequences=array();
/**
* Quotes a table name for use in a query.
* @param string table name
* @return string the properly quoted table name
*/
public function quoteTableName($name)
{
return $name;
}
/**
* Quotes a column name for use in a query.
* @param string column name
* @return string the properly quoted column name
*/
public function quoteColumnName($name)
{
return $name;
}
/**
* Creates a command builder for the database.
* This method may be overridden by child classes to create a DBMS-specific command builder.
* @return CDbCommandBuilder command builder instance
*/
protected function createCommandBuilder()
{
return new COciCommandBuilder($this);
}
/**
* @param string default schema.
*/
public function setDefaultSchema($schema)
{
$this->_defaultSchema=$schema;
}
/**
* @return string default schema.
*/
public function getDefaultSchema()
{
if (!strlen($this->_defaultSchema))
{
$this->setDefaultSchema(strtoupper($this->getDbConnection()->username));
}
return $this->_defaultSchema;
}
/**
* @param string table name with optional schema name prefix, uses default schema name prefix is not provided.
* @return array tuple as ($schemaName,$tableName)
*/
protected function getSchemaTableName($table)
{
$table = strtoupper($table);
if(count($parts= explode('.', str_replace('"','',$table))) > 1)
return array($parts[0], $parts[1]);
else
return array($this->getDefaultSchema(),$parts[0]);
}
/**
* Creates a table instance representing the metadata for the named table.
* @return CDbTableSchema driver dependent table metadata.
*/
protected function createTable($name)
{
$table=new COciTableSchema;
$this->resolveTableNames($table,$name);
if(!$this->findColumns($table))
return null;
$this->findConstraints($table);
return $table;
}
/**
* Generates various kinds of table names.
* @param COciTableSchema the table instance
* @param string the unquoted table name
*/
protected function resolveTableNames($table,$name)
{
$parts=explode('.',str_replace('"','',$name));
if(isset($parts[1]))
{
$schemaName=$parts[0];
$tableName=$parts[1];
}
else
{
$schemaName=$this->getDefaultSchema();
$tableName=$parts[0];
}
$table->name=$tableName;
$table->schemaName=$schemaName;
if($schemaName===$this->getDefaultSchema())
$table->rawName=$this->quoteTableName($tableName);
else
$table->rawName=$this->quoteTableName($schemaName).'.'.$this->quoteTableName($tableName);
}
/**
* Collects the table column metadata.
* @param COciTableSchema the table metadata
* @return boolean whether the table exists in the database
*/
protected function findColumns($table)
{
list($schemaName,$tableName) = $this->getSchemaTableName($table->name);
$sql=<<<EOD
SELECT a.column_name, a.data_type ||
case
when data_precision is not null
then '(' || a.data_precision ||
case when a.data_scale > 0 then ',' || a.data_scale else '' end
|| ')'
when data_type = 'DATE' then ''
else '(' || to_char(a.data_length) || ')'
end as data_type,
a.nullable, a.data_default,
( SELECT D.constraint_type
FROM ALL_CONS_COLUMNS C
inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
WHERE C.OWNER = B.OWNER
and C.table_name = B.object_name
and C.column_name = A.column_name
and D.constraint_type = 'P') as Key
FROM ALL_TAB_COLUMNS A
inner join ALL_OBJECTS B ON b.owner = a.owner and ltrim(B.OBJECT_NAME) = ltrim(A.TABLE_NAME)
WHERE
a.owner = '{$schemaName}'
and b.object_type = 'TABLE' or b.object_type = 'VIEW'
and b.object_name = '{$tableName}'
ORDER by a.column_id
EOD;
$command=$this->getDbConnection()->createCommand($sql);
if(($columns=$command->queryAll())===array()){
return false;
}
foreach($columns as $column)
{
$c=$this->createColumn($column);
$table->columns[$c->name]=$c;
if($c->isPrimaryKey)
{
if($table->primaryKey===null)
$table->primaryKey=$c->name;
else if(is_string($table->primaryKey))
$table->primaryKey=array($table->primaryKey,$c->name);
else
$table->primaryKey[]=$c->name;
$table->sequenceName='';
}
}
return true;
}
/**
* Creates a table column.
* @param array column metadata
* @return CDbColumnSchema normalized column metadata
*/
protected function createColumn($column)
{
$c=new COciColumnSchema;
$c->name=$column['COLUMN_NAME'];
$c->rawName=$this->quoteColumnName($c->name);
$c->allowNull=$column['NULLABLE']==='Y';
$c->isPrimaryKey=strpos($column['KEY'],'P')!==false;
$c->isForeignKey=false;
$c->init($column['DATA_TYPE'],$column['DATA_DEFAULT']);
return $c;
}
/**
* Collects the primary and foreign key column details for the given table.
* @param COciTableSchema the table metadata
*/
protected function findConstraints($table)
{
$sql=<<<EOD
SELECT D.constraint_type as CONSTRAINT_TYPE, C.COLUMN_NAME, C.position, D.r_constraint_name,
E.table_name as table_ref, f.column_name as column_ref
FROM ALL_CONS_COLUMNS C
inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
left join ALL_constraints E on E.OWNER = D.r_OWNER and E.constraint_name = D.r_constraint_name
left join ALL_cons_columns F on F.OWNER = E.OWNER and F.constraint_name = E.constraint_name and F.position = c.position
WHERE C.OWNER = '{$table->schemaName}'
and C.table_name = '{$table->name}'
and D.constraint_type <> 'P'
order by d.constraint_name, c.position
EOD;
$command=$this->getDbConnection()->createCommand($sql);
foreach($command->queryAll() as $row)
{
if($row['CONSTRAINT_TYPE']==='R') // foreign key
{
$name = $row["COLUMN_NAME"];
$table->foreignKeys[$name]=array($row["TABLE_REF"], $row["COLUMN_REF"]);
if(isset($table->columns[$name]))
$table->columns[$name]->isForeignKey=true;
}
}
}
/**
* Returns all table names in the database.
* @return array all table names in the database.
*/
protected function findTableNames($schema='')
{
if($schema==='')
{
$sql=<<<EOD
SELECT table_name, '{$schema}' as table_schema FROM user_tables
EOD;
$command=$this->getDbConnection()->createCommand($sql);
}
else
{
$sql=<<<EOD
SELECT object_name as table_name, owner as table_schema FROM all_objects
WHERE object_type = 'TABLE' AND owner=:schema
EOD;
$command=$this->getDbConnection()->createCommand($sql);
$command->bindParam(':schema',$schema);
}
$rows=$command->queryAll();
$names=array();
foreach($rows as $row)
{
if($schema===$this->getDefaultSchema())
$names[]=$row['table_name'];
else
$names[]=$row['schema_name'].'.'.$row['table_name'];
}
return $names;
}
}