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129 lines
3.4 KiB
PHP
129 lines
3.4 KiB
PHP
<?php
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/**
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* CSqliteSchema class file.
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*
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* @author Qiang Xue <qiang.xue@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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* CSqliteSchema is the class for retrieving metadata information from a SQLite (2/3) database.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id: CSqliteSchema.php 487 2009-01-08 03:44:52Z qiang.xue $
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* @package system.db.schema.sqlite
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* @since 1.0
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*/
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class CSqliteSchema extends CDbSchema
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{
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/**
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* Returns all table names in the database.
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* @param string the schema of the tables. This is not used for sqlite database.
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* @return array all table names in the database.
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* @since 1.0.2
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*/
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protected function findTableNames($schema='')
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{
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$sql="SELECT DISTINCT tbl_name FROM sqlite_master WHERE tbl_name<>'sqlite_sequence'";
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return $this->getDbConnection()->createCommand($sql)->queryColumn();
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}
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/**
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* Creates a command builder for the database.
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* @return CSqliteCommandBuilder command builder instance
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*/
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protected function createCommandBuilder()
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{
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return new CSqliteCommandBuilder($this);
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}
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/**
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* Creates a table instance representing the metadata for the named table.
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* @return CDbTableSchema driver dependent table metadata. Null if the table does not exist.
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*/
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protected function createTable($name)
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{
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$db=$this->getDbConnection();
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$table=new CDbTableSchema;
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$table->name=$name;
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$table->rawName=$this->quoteTableName($name);
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if($this->findColumns($table))
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{
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$this->findConstraints($table);
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return $table;
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}
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else
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return null;
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}
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/**
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* Collects the table column metadata.
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* @param CDbTableSchema the table metadata
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* @return boolean whether the table exists in the database
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*/
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protected function findColumns($table)
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{
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$sql="PRAGMA table_info({$table->rawName})";
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$columns=$this->getDbConnection()->createCommand($sql)->queryAll();
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if(empty($columns))
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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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$table->columns[$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[]=$c->name;
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}
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}
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if(is_string($table->primaryKey) && !strncasecmp($table->columns[$table->primaryKey]->dbType,'int',3))
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$table->sequenceName='';
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return true;
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}
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/**
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* Collects the foreign key column details for the given table.
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* @param CDbTableSchema the table metadata
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*/
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protected function findConstraints($table)
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{
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$foreignKeys=array();
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$sql="PRAGMA foreign_key_list({$table->rawName})";
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$keys=$this->getDbConnection()->createCommand($sql)->queryAll();
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foreach($keys as $key)
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{
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$column=$table->columns[$key['from']];
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$column->isForeignKey=true;
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$foreignKeys[$key['from']]=array($key['table'],$key['to']);
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}
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$table->foreignKeys=$foreignKeys;
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}
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/**
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* Creates a table column.
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* @param array column metadata
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* @return CDbColumnSchema normalized column metadata
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*/
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protected function createColumn($column)
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{
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$c=new CSqliteColumnSchema;
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$c->name=$column['name'];
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$c->rawName=$this->quoteColumnName($c->name);
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$c->allowNull=!$column['notnull'];
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$c->isPrimaryKey=$column['pk']!=0;
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$c->isForeignKey=false;
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$c->init(strtolower($column['type']),$column['dflt_value']);
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return $c;
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}
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}
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