<?php
/*
 *  $Id: MSSQLTableInfo.php,v 1.14 2006/01/17 19:44:39 hlellelid Exp $
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information please see
 * <http://creole.phpdb.org>.
 */

require_once 'creole/CreoleTypes.php';
require_once 'creole/metadata/TableInfo.php';

/**
 * MSSQL implementation of TableInfo.
 * 
 * @author    Hans Lellelid <hans@xmpl.org>
 * @version   $Revision: 1.14 $
 * @package   creole.drivers.mssql.metadata
 */
class MSSQLTableInfo extends TableInfo {    
    
    /**
     * Loads the columns for this table.
     * @return void
     */                          
    protected function initColumns() 
    {    
        include_once 'creole/metadata/ColumnInfo.php';
        include_once 'creole/drivers/mssql/MSSQLTypes.php';
        
        if (!@mssql_select_db($this->dbname, $this->conn->getResource())) {
            throw new SQLException('No database selected');
        }
         
        $res = mssql_query("sp_columns ".$this->name, $this->conn->getResource());
        if (!$res) {
            throw new SQLException('Could not get column names', mssql_get_last_message());
        }
        
        while ($row = mssql_fetch_array($res)) {
            $name = $row['COLUMN_NAME'];
            $type = $row['TYPE_NAME'];
            $length = $row['LENGTH'];
            $is_nullable = $row['NULLABLE'];
            $default = $row['COLUMN_DEF'];
            $precision = $row['PRECISION'];
            $scale = $row['SCALE'];
			$identity = false;
			if (strtolower($type) == "int identity") {
			    $identity = true;
			}
            $this->columns[$name] = new ColumnInfo($this, $name, MSSQLTypes::getType($type), $type, $length, $precision, $scale, $is_nullable, $default, $identity);
        }
                
        $this->colsLoaded = true;
    }

    /**
     * Loads the indexes for this table.
     * @return void
     */      
    protected function initIndexes()
    {
        // columns have to be loaded first
        if (!$this->colsLoaded) $this->initColumns();
        include_once 'creole/metadata/IndexInfo.php';
        
        if (!@mssql_select_db($this->dbname, $this->conn->getResource())) {
            throw new SQLException('No database selected');
        } 
        
        $res = mssql_query("sp_indexes_rowset ".$this->name, $this->conn->getResource());
        
        while ($row = mssql_fetch_array($res)) {
            $name = $row['INDEX_NAME'];            
            // All primary keys are indexes (right...?)
            if (!isset($this->indexes[$name])) {
                $this->indexes[$name] = new IndexInfo($name);
            }
            $this->indexes[$name]->addColumn($this->columns[ $row['COLUMN_NAME'] ]);
        }
        
        $this->indexesLoaded = true;        
    }

    /**
     * Loads the foreign keys for this table.
     * @return void
     */      
    protected function initForeignKeys()
    {
        // columns have to be loaded first
        if (!$this->colsLoaded) $this->initColumns();
        include_once 'creole/metadata/ForeignKeyInfo.php';
        
        if (!@mssql_select_db($this->dbname, $this->conn->getResource())) {
            throw new SQLException('No database selected');
        } 
        
        $res = mssql_query("SELECT     ccu1.TABLE_NAME, ccu1.COLUMN_NAME, ccu2.TABLE_NAME AS FK_TABLE_NAME, ccu2.COLUMN_NAME AS FK_COLUMN_NAME
                            FROM         INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ccu1 INNER JOIN
                                      INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc1 ON tc1.CONSTRAINT_NAME = ccu1.CONSTRAINT_NAME AND 
                                      CONSTRAINT_TYPE = 'Foreign Key' INNER JOIN
                                      INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1 ON rc1.CONSTRAINT_NAME = tc1.CONSTRAINT_NAME INNER JOIN
                                      INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ccu2 ON ccu2.CONSTRAINT_NAME = rc1.UNIQUE_CONSTRAINT_NAME
                            WHERE     (ccu1.table_name = '".$this->name."')", $this->conn->getResource());
        
        while($row = mssql_fetch_array($res)) {
            $name = $row['COLUMN_NAME'];
            $ftbl = $row['FK_TABLE_NAME'];
            $fcol = $row['FK_COLUMN_NAME'];

            if (!isset($this->foreignKeys[$name])) {
                $this->foreignKeys[$name] = new ForeignKeyInfo($name);

                if ($this->database->hasTable($ftbl)) {
                    $foreignTable = $this->database->getTable($ftbl);
                } else {                
                    $foreignTable = new TableInfo($ltbl);
                    $this->database->addTable($foreignTable);
                }

                if ($foreignTable->hasColumn($fcol)) {
                    $foreignCol = $foreignTable->getColumn($fcol);
                } else {                
                    $foreignCol = new ColumnInfo($foreignTable, $fcol);
                    $foreignTable->addColumn($foreignCol);
                }
                                
                $this->foreignKeys[$name]->addReference($this->columns[$name], $foreignCol);
            }
        }
        
        $this->fksLoaded = true;
    }

    /**
     * Loads the primary key info for this table.
     * @return void
     */      
    protected function initPrimaryKey()
    {
        // columns have to be loaded first
        if (!$this->colsLoaded) $this->initColumns();
        include_once 'creole/metadata/PrimaryKeyInfo.php';
        
        if (!@mssql_select_db($this->dbname, $this->conn->getResource())) {
            throw new SQLException('No database selected');
        } 
        
        $res = mssql_query("SELECT COLUMN_NAME 
                        FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS 
                                INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ON 
                      INFORMATION_SCHEMA.TABLE_CONSTRAINTS.CONSTRAINT_NAME = INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE.constraint_name
                        WHERE     (INFORMATION_SCHEMA.TABLE_CONSTRAINTS.CONSTRAINT_TYPE = 'PRIMARY KEY') AND 
                      (INFORMATION_SCHEMA.TABLE_CONSTRAINTS.TABLE_NAME = '".$this->name."')", $this->conn->getResource());
        
        // Loop through the returned results, grouping the same key_name together.
        // name of the primary key will be the first column name in the key.
        while($row = mssql_fetch_row($res)) {
            $name = $row[0];            
            if (!isset($this->primaryKey)) {
                $this->primaryKey = new PrimaryKeyInfo($name);
            }
            $this->primaryKey->addColumn($this->columns[ $name ]);
        }        
        
        $this->pkLoaded = true;
    }    
    
}