diff options
Diffstat (limited to 'framework/Data/Common/Sqlite/TSqliteMetaData.php')
| -rw-r--r-- | framework/Data/Common/Sqlite/TSqliteMetaData.php | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/framework/Data/Common/Sqlite/TSqliteMetaData.php b/framework/Data/Common/Sqlite/TSqliteMetaData.php new file mode 100644 index 00000000..68734046 --- /dev/null +++ b/framework/Data/Common/Sqlite/TSqliteMetaData.php @@ -0,0 +1,150 @@ +<?php +/**
+ * TSqliteMetaData class file.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright © 2005-2007 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id: TSqliteMetaData.php 1861 2007-04-12 08:05:03Z wei $
+ * @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 PostgreSQL database table and column information.
+ *
+ * @author Wei Zhuo <weizho[at]gmail[dot]com>
+ * @version $Id: TSqliteMetaData.php 1861 2007-04-12 08:05:03Z wei $
+ * @package System.Data.Commom.Sqlite
+ * @since 3.1
+ */
+class TSqliteMetaData extends TDbMetaData
+{
+ /**
+ * Get the column definitions for given table.
+ * @param string table name.
+ * @return TPgsqlTableInfo table information.
+ */
+ protected function createTableInfo($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'] = $table;
+ if($this->getIsView($tableName))
+ $info['IsView'] = true;
+ $tableInfo = new TSqliteTableInfo($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['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;
+ }
+
+} +?>
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