334 lines
13 KiB
PHP
334 lines
13 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 2008-2013 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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* @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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* @var array the abstract column types mapped to physical column types.
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* @since 1.1.6
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*/
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public $columnTypes=array(
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'pk' => 'integer PRIMARY KEY AUTOINCREMENT NOT NULL',
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'string' => 'varchar(255)',
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'text' => 'text',
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'integer' => 'integer',
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'float' => 'float',
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'decimal' => 'decimal',
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'datetime' => 'datetime',
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'timestamp' => 'timestamp',
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'time' => 'time',
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'date' => 'date',
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'binary' => 'blob',
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'boolean' => 'tinyint(1)',
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'money' => 'decimal(19,4)',
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);
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/**
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* Resets the sequence value of a table's primary key.
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* The sequence will be reset such that the primary key of the next new row inserted
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* will have the specified value or max value of a primary key plus one (i.e. sequence trimming).
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* @param CDbTableSchema $table the table schema whose primary key sequence will be reset
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* @param integer|null $value the value for the primary key of the next new row inserted.
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* If this is not set, the next new row's primary key will have the max value of a primary
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* key plus one (i.e. sequence trimming).
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* @since 1.1
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*/
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public function resetSequence($table,$value=null)
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{
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if($table->sequenceName===null)
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return;
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if($value!==null)
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$value=(int)($value)-1;
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else
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$value=(int)$this->getDbConnection()
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->createCommand("SELECT MAX(`{$table->primaryKey}`) FROM {$table->rawName}")
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->queryScalar();
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try
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{
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// it's possible that 'sqlite_sequence' does not exist
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$this->getDbConnection()
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->createCommand("UPDATE sqlite_sequence SET seq='$value' WHERE name='{$table->name}'")
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->execute();
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}
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catch(Exception $e)
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{
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}
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}
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/**
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* Enables or disables integrity check. Note that this method used to do nothing before 1.1.14. Since 1.1.14
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* it changes integrity check state as expected.
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* @param boolean $check whether to turn on or off the integrity check.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* @since 1.1
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*/
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public function checkIntegrity($check=true,$schema='')
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{
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$this->getDbConnection()->createCommand('PRAGMA foreign_keys='.(int)$check)->execute();
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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 $schema the schema of the tables. This is not used for sqlite database.
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* @return array all table names in the database.
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*/
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protected function findTableNames($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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* Loads the metadata for the specified table.
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* @param string $name table name
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* @return CDbTableSchema driver dependent table metadata. Null if the table does not exist.
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*/
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protected function loadTable($name)
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{
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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 $table the table metadata
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* @return boolean whether the table exists in the database
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*/
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protected function findColumns($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=$c->name;
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elseif(is_string($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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{
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$table->sequenceName='';
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$table->columns[$table->primaryKey]->autoIncrement=true;
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}
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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 $table the table metadata
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*/
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protected function findConstraints($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 $column column metadata
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* @return CDbColumnSchema normalized column metadata
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*/
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protected function createColumn($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->comment=null; // SQLite does not support column comments at all
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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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* Builds a SQL statement for renaming a DB table.
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* @param string $table the table to be renamed. The name will be properly quoted by the method.
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* @param string $newName the new table name. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB table.
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* @since 1.1.13
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*/
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public function renameTable($table, $newName)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table) . ' RENAME TO ' . $this->quoteTableName($newName);
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}
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/**
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* Builds a SQL statement for truncating a DB table.
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* @param string $table the table to be truncated. The name will be properly quoted by the method.
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* @return string the SQL statement for truncating a DB table.
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* @since 1.1.6
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*/
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public function truncateTable($table)
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{
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return "DELETE FROM ".$this->quoteTableName($table);
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}
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/**
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* Builds a SQL statement for dropping a DB column.
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* Because SQLite does not support dropping a DB column, calling this method will throw an exception.
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* @param string $table the table whose column is to be dropped. The name will be properly quoted by the method.
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* @param string $column the name of the column to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a DB column.
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* @since 1.1.6
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*/
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public function dropColumn($table, $column)
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{
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throw new CDbException(Yii::t('yii', 'Dropping DB column is not supported by SQLite.'));
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}
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/**
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* Builds a SQL statement for renaming a column.
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* Because SQLite does not support renaming a DB column, calling this method will throw an exception.
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* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
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* @param string $name the old name of the column. The name will be properly quoted by the method.
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* @param string $newName the new name of the column. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB column.
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* @since 1.1.6
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*/
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public function renameColumn($table, $name, $newName)
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{
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throw new CDbException(Yii::t('yii', 'Renaming a DB column is not supported by SQLite.'));
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}
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/**
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* Builds a SQL statement for adding a foreign key constraint to an existing table.
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* Because SQLite does not support adding foreign key to an existing table, calling this method will throw an exception.
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* @param string $name the name of the foreign key constraint.
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* @param string $table the table that the foreign key constraint will be added to.
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* @param string $columns the name of the column to that the constraint will be added on. If there are multiple columns, separate them with commas.
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* @param string $refTable the table that the foreign key references to.
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* @param string $refColumns the name of the column that the foreign key references to. If there are multiple columns, separate them with commas.
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* @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @return string the SQL statement for adding a foreign key constraint to an existing table.
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* @since 1.1.6
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*/
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public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete=null, $update=null)
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{
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throw new CDbException(Yii::t('yii', 'Adding a foreign key constraint to an existing table is not supported by SQLite.'));
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}
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/**
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* Builds a SQL statement for dropping a foreign key constraint.
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* Because SQLite does not support dropping a foreign key constraint, calling this method will throw an exception.
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* @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a foreign key constraint.
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* @since 1.1.6
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*/
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public function dropForeignKey($name, $table)
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{
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throw new CDbException(Yii::t('yii', 'Dropping a foreign key constraint is not supported by SQLite.'));
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}
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/**
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* Builds a SQL statement for changing the definition of a column.
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* Because SQLite does not support altering a DB column, calling this method will throw an exception.
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* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
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* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
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* @param string $type the new column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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* @return string the SQL statement for changing the definition of a column.
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* @since 1.1.6
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*/
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public function alterColumn($table, $column, $type)
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{
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throw new CDbException(Yii::t('yii', 'Altering a DB column is not supported by SQLite.'));
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}
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/**
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* Builds a SQL statement for dropping an index.
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* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping an index.
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* @since 1.1.6
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*/
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public function dropIndex($name, $table)
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{
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return 'DROP INDEX '.$this->quoteTableName($name);
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}
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/**
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* Builds a SQL statement for adding a primary key constraint to an existing table.
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* Because SQLite does not support adding a primary key on an existing table this method will throw an exception.
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* @param string $name the name of the primary key constraint.
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* @param string $table the table that the primary key constraint will be added to.
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* @param string|array $columns comma separated string or array of columns that the primary key will consist of.
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* @return string the SQL statement for adding a primary key constraint to an existing table.
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* @since 1.1.13
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*/
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public function addPrimaryKey($name,$table,$columns)
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{
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throw new CDbException(Yii::t('yii', 'Adding a primary key after table has been created is not supported by SQLite.'));
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}
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/**
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* Builds a SQL statement for removing a primary key constraint to an existing table.
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* Because SQLite does not support dropping a primary key from an existing table this method will throw an exception
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* @param string $name the name of the primary key constraint to be removed.
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* @param string $table the table that the primary key constraint will be removed from.
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* @return string the SQL statement for removing a primary key constraint from an existing table.
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* @since 1.1.13
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*/
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public function dropPrimaryKey($name,$table)
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{
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throw new CDbException(Yii::t('yii', 'Removing a primary key after table has been created is not supported by SQLite.'));
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}
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}
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