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<?php
/**
* TSqliteMetaData class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link https://github.com/pradosoft/prado
* @copyright Copyright © 2005-2016 The PRADO Group
* @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
* @package System.Data.Common.Sqlite
*/
/**
* Load the base TDbMetaData class.
*/
Prado::using('System.Data.Common.TDbMetaData');
Prado::using('System.Data.Common.Sqlite.TSqliteTableInfo');
/**
* TSqliteMetaData loads SQLite database table and column information.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @package System.Data.Commom.Sqlite
* @since 3.1
*/
class TSqliteMetaData extends TDbMetaData
{
/**
* @return string TDbTableInfo class name.
*/
protected function getTableInfoClass()
{
return 'TSqliteTableInfo';
}
/**
* Quotes a table name for use in a query.
* @param string $name table name
* @return string the properly quoted table name
*/
public function quoteTableName($name)
{
return parent::quoteTableName($name, "'", "'");
}
/**
* Quotes a column name for use in a query.
* @param string $name column name
* @return string the properly quoted column name
*/
public function quoteColumnName($name)
{
return parent::quoteColumnName($name, '"', '"');
}
/**
* Quotes a column alias for use in a query.
* @param string $name column alias
* @return string the properly quoted column alias
*/
public function quoteColumnAlias($name)
{
return parent::quoteColumnAlias($name, '"', '"');
}
/**
* Get the column definitions for given table.
* @param string table name.
* @return TPgsqlTableInfo table information.
*/
protected function createTableInfo($tableName)
{
$tableName = str_replace("'",'',$tableName);
$this->getDbConnection()->setActive(true);
$table = $this->getDbConnection()->quoteString($tableName);
$sql = "PRAGMA table_info({$table})";
$command = $this->getDbConnection()->createCommand($sql);
$foreign = $this->getForeignKeys($table);
$index=0;
$columns=array();
$primary=array();
foreach($command->query() as $col)
{
$col['index'] = $index++;
$column = $this->processColumn($col, $foreign);
$columns[$col['name']] = $column;
if($column->getIsPrimaryKey())
$primary[] = $col['name'];
}
$info['TableName'] = $tableName;
if($this->getIsView($tableName))
$info['IsView'] = true;
if(count($columns)===0)
throw new TDbException('dbmetadata_invalid_table_view', $tableName);
$class = $this->getTableInfoClass();
$tableInfo = new $class($info,$primary,$foreign);
$tableInfo->getColumns()->copyFrom($columns);
return $tableInfo;
}
/**
* @param string table name.
* @return boolean true if the table is a view.
*/
protected function getIsView($tableName)
{
$sql = 'SELECT count(*) FROM sqlite_master WHERE type="view" AND name= :table';
$this->getDbConnection()->setActive(true);
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $tableName);
return intval($command->queryScalar()) === 1;
}
/**
* @param array column information.
* @param array foreign key details.
* @return TSqliteTableColumn column details.
*/
protected function processColumn($col, $foreign)
{
$columnId = $col['name']; //use column name as column Id
$info['ColumnName'] = '"'.$columnId.'"'; //quote the column names!
$info['ColumnId'] = $columnId;
$info['ColumnIndex'] = $col['index'];
if($col['notnull']!=='99')
$info['AllowNull'] = true;
if($col['pk']==='1')
$info['IsPrimaryKey'] = true;
if($this->isForeignKeyColumn($columnId, $foreign))
$info['IsForeignKey'] = true;
if($col['dflt_value']!==null)
$info['DefaultValue'] = $col['dflt_value'];
$type = strtolower($col['type']);
$info['AutoIncrement'] = $type==='integer' && $col['pk']==='1';
$info['DbType'] = $type;
$match=array();
if(is_int($pos=strpos($type, '(')) && preg_match('/\((.*)\)/', $type, $match))
{
$ps = explode(',', $match[1]);
if(count($ps)===2)
{
$info['NumericPrecision'] = intval($ps[0]);
$info['NumericScale'] = intval($ps[1]);
}
else
$info['ColumnSize']=intval($match[1]);
$info['DbType'] = substr($type,0,$pos);
}
return new TSqliteTableColumn($info);
}
/**
*
*
* @param string quoted table name.
* @return array foreign key details.
*/
protected function getForeignKeys($table)
{
$sql = "PRAGMA foreign_key_list({$table})";
$command = $this->getDbConnection()->createCommand($sql);
$fkeys = array();
foreach($command->query() as $col)
{
$fkeys[$col['table']]['keys'][$col['from']] = $col['to'];
$fkeys[$col['table']]['table'] = $col['table'];
}
return count($fkeys) > 0 ? array_values($fkeys) : $fkeys;
}
/**
* @param string column name.
* @param array foreign key column names.
* @return boolean true if column is a foreign key.
*/
protected function isForeignKeyColumn($columnId, $foreign)
{
foreach($foreign as $fk)
{
if(in_array($columnId, array_keys($fk['keys'])))
return true;
}
return false;
}
/**
* Returns all table names in the database.
* @param string $schema the schema of the tables. This is not used for sqlite database.
* @return array all table names in the database.
*/
public function findTableNames($schema='')
{
$sql="SELECT DISTINCT tbl_name FROM sqlite_master WHERE tbl_name<>'sqlite_sequence'";
return $this->getDbConnection()->createCommand($sql)->queryColumn();
}
}
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