<?php
/**
* CCubridSchema class file.
*
* @author Esen Sagynov <kadismal@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CCubridSchema is the class for retrieving metadata information from a CUBRID database (version 8.4.0 and later).
*
* @author Esen Sagynov <kadismal@gmail.com>
* @package system.db.schema.cubrid
* @since 1.1.16
*/
class CCubridSchema extends CDbSchema
{
public $columnTypes=array(
'pk' => 'INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY',
// same as STRING or CHARACTER VARYING
'string' => 'VARCHAR(255)',
'text' => 'VARCHAR(65535)',
'integer' => 'INTEGER',
'float' => 'NUMERIC',
'real' => 'NUMERIC',
'decimal' => 'NUMERIC',
'datetime' => 'DATETIME',
'timestamp' => 'TIMESTAMP',
'time' => 'TIME',
'date' => 'DATE',
'binary' => 'BIT VARYING',
'bool' => 'SHORT',
'boolean' => 'SHORT',
'money' => 'NUMERIC(19,4)',
);
/**
* Quotes a table name for use in a query.
* A simple table name does not schema prefix.
* @param string $name table name
* @return string the properly quoted table name
*/
public function quoteSimpleTableName($name)
{
return '`'.$name.'`';
}
/**
* Quotes a column name for use in a query.
* A simple column name does not contain prefix.
* @param string $name column name
* @return string the properly quoted column name
*/
public function quoteSimpleColumnName($name)
{
return '`'.$name.'`';
}
/**
* Compares two table names.
* The table names can be either quoted or unquoted. This method
* will consider both cases.
* @param string $name1 table name 1
* @param string $name2 table name 2
* @return boolean whether the two table names refer to the same table.
*/
public function compareTableNames($name1,$name2)
{
return parent::compareTableNames(strtolower($name1),strtolower($name2));
}
/**
* Resets the sequence value of a table's primary key.
* The sequence will be reset such that the primary key of the next new row inserted
* will have the specified value or 1.
* @param CDbTableSchema $table the table schema whose primary key sequence will be reset
* @param mixed $value the value for the primary key of the next new row inserted. If this is not set,
* the next new row's primary key will have a value 1.
*/
public function resetSequence($table,$value=null)
{
if($table->sequenceName!==null)
{
if($value===null)
$value=$this->getDbConnection()->createCommand("SELECT MAX(`{$table->primaryKey}`) FROM {$table->rawName}")->queryScalar()+1;
else
$value=(int)$value;
$this->getDbConnection()->createCommand("ALTER TABLE {$table->rawName} AUTO_INCREMENT=$value")->execute();
}
}
/**
* Creates a table instance representing the metadata for the named table.
* @param string $name table name
* @return CCubridTableSchema driver dependent table metadata. Null if the table does not exist.
*/
protected function loadTable($name)
{
$table=new CCubridTableSchema;
$this->resolveTableNames($table,$name);
if($this->findColumns($table))
{
$this->findPrimaryKeys($table);
$this->findConstraints($table);
return $table;
}
else
return null;
}
/**
* Generates various kinds of table names.
* @param CCubridTableSchema $table the table instance
* @param string $name the unquoted table name
*/
protected function resolveTableNames($table,$name)
{
$parts=explode('.',str_replace('`','',$name));
if(isset($parts[1]))
{
$table->schemaName=$parts[0];
$table->name=$parts[1];
$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
}
else
{
$table->name=$parts[0];
$table->rawName=$this->quoteTableName($table->name);
}
}
/**
* Collects the table column metadata.
* @param CCubridTableSchema $table the table metadata
* @return boolean whether the table exists in the database
*/
protected function findColumns($table)
{
// it may be good to use CUBRID PHP API to retrieve column info.
$sql='SHOW COLUMNS FROM '.$table->rawName;
try
{
$columns=$this->getDbConnection()->createCommand($sql)->queryAll();
}
catch(Exception $e)
{
return false;
}
foreach($columns as $column)
{
$c=$this->createColumn($column);
$table->columns[$c->name]=$c;
}
return true;
}
/**
* Creates a table column.
* @param array $column column metadata
* @return CDbColumnSchema normalized column metadata
*/
protected function createColumn($column)
{
$c=new CCubridColumnSchema;
$c->name=$column['Field'];
$c->rawName=$this->quoteColumnName($c->name);
$c->allowNull=$column['Null']==='YES';
$c->isPrimaryKey=strpos($column['Key'],'PRI')!==false;
$c->isForeignKey=false;
$c->init($column['Type'],$column['Default']);
$c->autoIncrement=strpos(strtolower($column['Extra']),'auto_increment')!==false;
return $c;
}
/**
* @return float server version.
*/
protected function getServerVersion()
{
$version=$this->getDbConnection()->getAttribute(PDO::ATTR_SERVER_VERSION);
$digits=array();
preg_match('/(\d+)\.(\d+)\.(\d+).(\d+)/', $version, $digits);
return floatval($digits[1].'.'.$digits[2].$digits[3].'.'.$digits[4]);
}
/**
* Collects the foreign key column details for the given table.
* @param CCubridTableSchema $table the table metadata
*/
protected function findConstraints($table)
{
$schemas=$this->getDbConnection()->getPdoInstance()->cubrid_schema(PDO::CUBRID_SCH_IMPORTED_KEYS,$table->name);
foreach($schemas as $schema)
{
$table->foreignKeys[$schema["FKCOLUMN_NAME"]]=array($schema["PKTABLE_NAME"],$schema["PKCOLUMN_NAME"]);
if(isset($table->columns[$schema["FKCOLUMN_NAME"]]))
$table->columns[$schema["FKCOLUMN_NAME"]]->isForeignKey=true;
}
}
/**
* Collects the primary key column details for the given table.
* @param CCubridTableSchema $table the table metadata
*/
protected function findPrimaryKeys($table)
{
$pks=$this->getDbConnection()->getPdoInstance()->cubrid_schema(PDO::CUBRID_SCH_PRIMARY_KEY,$table->name);
foreach($pks as $pk)
{
$c = $table->columns[$pk['ATTR_NAME']];
$c->isPrimaryKey = true;
if($table->primaryKey===null)
$table->primaryKey=$c->name;
elseif(is_string($table->primaryKey))
$table->primaryKey=array($table->primaryKey,$c->name);
else
$table->primaryKey[]=$c->name;
if($c->autoIncrement)
$table->sequenceName='';
}
}
/**
* Returns all table names in the database.
* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
* If not empty, the returned table names will be prefixed with the schema name.
* @return array all table names in the database.
*/
protected function findTableNames($schema='')
{
// CUBRID does not allow to look into another database from within another connection.
// If necessary user has to establish a connection to that particular database and
// query to show all tables. For this reason if a user executes this funtion
// we will return all table names of the currently connected database.
return $this->getDbConnection()->createCommand('SHOW TABLES')->queryColumn();
}
}