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authorChristophe.Boulain <>2009-06-15 07:49:42 +0000
committerChristophe.Boulain <>2009-06-15 07:49:42 +0000
commit3f0149b5b74d4017ba7f4ca28aa8a3e2053db964 (patch)
treec21232fbbd5218b826574458612557f59cf7e3c2 /framework/Db/schema/mysql/TMysqlSchema.php
parentcb0f97438fe634c5a95179d47c78af04fffa751b (diff)
Primilary import of new db stuff
Diffstat (limited to 'framework/Db/schema/mysql/TMysqlSchema.php')
-rwxr-xr-xframework/Db/schema/mysql/TMysqlSchema.php205
1 files changed, 205 insertions, 0 deletions
diff --git a/framework/Db/schema/mysql/TMysqlSchema.php b/framework/Db/schema/mysql/TMysqlSchema.php
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+++ b/framework/Db/schema/mysql/TMysqlSchema.php
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+<?php
+/**
+ * TMysqlSchema class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+prado::using('System.db.schema.TDbSchema');
+prado::using('System.db.schema.mysql.TMysqlTableSchema');
+prado::using('System.db.schema.mysql.TMysqlColumnSchema');
+
+/**
+ * TMysqlSchema is the class for retrieving metadata information from a MySQL database (version 4.1.x and 5.x).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package system.db.schema.mysql
+ * @since 1.0
+ */
+class TMysqlSchema extends TDbSchema
+{
+ private $_tableNames;
+ private $_schemaNames;
+
+ /**
+ * Quotes a table name for use in a query.
+ * @param string table name
+ * @return string the properly quoted table name
+ */
+ public function quoteTableName($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 '`'.$name.'`';
+ }
+
+ /**
+ * Compares two table names.
+ * The table names can be either quoted or unquoted. This method
+ * will consider both cases.
+ * @param string table name 1
+ * @param string table name 2
+ * @return boolean whether the two table names refer to the same table.
+ */
+ public function compareTableNames($name1,$name2)
+ {
+ return parent::compareTableNames(strtolower($name1),strtolower($name2));
+ }
+
+ /**
+ * Creates a table instance representing the metadata for the named table.
+ * @return TMysqlTableSchema driver dependent table metadata. Null if the table does not exist.
+ */
+ protected function createTable($name)
+ {
+ $table=new TMysqlTableSchema;
+ $this->resolveTableNames($table,$name);
+
+ if($this->findColumns($table))
+ {
+ $this->findConstraints($table);
+ return $table;
+ }
+ else
+ return null;
+ }
+
+ /**
+ * Generates various kinds of table names.
+ * @param TMysqlTableSchema the table instance
+ * @param string the unquoted table name
+ */
+ protected function resolveTableNames($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($table->name);
+ }
+ }
+
+ /**
+ * Collects the table column metadata.
+ * @param TMysqlTableSchema the table metadata
+ * @return boolean whether the table exists in the database
+ */
+ protected function findColumns($table)
+ {
+ $sql='SHOW COLUMNS FROM '.$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]=$c;
+ if($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;
+ if(strpos(strtolower($column['Extra']),'auto_increment')!==false)
+ $table->sequenceName='';
+ }
+ }
+ return true;
+ }
+
+ /**
+ * Creates a table column.
+ * @param array column metadata
+ * @return TDbColumnSchema normalized column metadata
+ */
+ protected function createColumn($column)
+ {
+ $c=new TMysqlColumnSchema;
+ $c->name=$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']);
+ return $c;
+ }
+
+ /**
+ * @return float server version.
+ */
+ protected function getServerVersion()
+ {
+ $version=$this->getDbConnection()->getAttribute(PDO::ATTR_SERVER_VERSION);
+ $digits=array();
+ preg_match('/(\d+)\.(\d+)\.(\d+)/', $version, $digits);
+ return floatval($digits[1].'.'.$digits[2].$digits[3]);
+ }
+
+ /**
+ * Collects the foreign key column details for the given table.
+ * @param TMysqlTableSchema the table metadata
+ */
+ protected function findConstraints($table)
+ {
+ $row=$this->getDbConnection()->createCommand('SHOW CREATE TABLE '.$table->rawName)->queryRow();
+ $matches=array();
+ $regexp='/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';
+ foreach($row as $sql)
+ {
+ if(preg_match_all($regexp,$sql,$matches,PREG_SET_ORDER))
+ break;
+ }
+ $foreign = array();
+ foreach($matches as $match)
+ {
+ $keys=array_map('trim',explode(',',str_replace('`','',$match[1])));
+ $fks=array_map('trim',explode(',',str_replace('`','',$match[3])));
+ foreach($keys as $k=>$name)
+ {
+ $table->foreignKeys[$name]=array(str_replace('`','',$match[2]),$fks[$k]);
+ if(isset($table->columns[$name]))
+ $table->columns[$name]->isForeignKey=true;
+ }
+ }
+ }
+
+ /**
+ * Returns all table names in the database.
+ * @return array all table names in the database.
+ * @since 1.0.2
+ */
+ protected function findTableNames($schema='')
+ {
+ if($schema==='')
+ return $this->getDbConnection()->createCommand('SHOW TABLES')->queryColumn();
+ $names=$this->getDbConnection()->createCommand('SHOW TABLES FROM '.$this->quoteTableName($schema))->queryColumn();
+ foreach($names as &$name)
+ $name=$schema.'.'.$name;
+ return $names;
+ }
+}