Library /lib/yadal/class.MySQL.php

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<?php
/**
 * Yadal interface for the MySQL database type
 *
 * @package Yadal
 */


/**
 * class MySQL
 *
 * Yadal - Yet Another Database Abstraction Layer
 * MySQL class
 *
 * @author Teye Heimans
 * @package Yadal
 */
class MySQL extends Yadal
{
    /**
     * MySQL::MySQL()
     *
     * Constructor: set the database we should be using
     *
     * @param string $db: The database which should be used
     * @author Teye Heimans
     */
    function MySQL( $db )
    {
        $this->Yadal( $db );
        $this->_quoteNumbers = true;
        $this->_nameQuote = '`';
    }

    /**
     * MySQL::connect()
     *
     * Make a connection with the database and
     * select the database.
     *
     * @param string host: the host to connect to
     * @param string username: the username which should be used to login
     * @param string password: the password which should be used to login
     * @return resource: The connection resource
     * @access public
     * @author Teye Heimans
     */
    function connect( $host = 'localhost', $username = '', $password = '' )
    {
    	// connect with the mysql database
    	$this->_conn = mysql_connect( $host, $username, $password );

    	// connection made?
    	if( $this->_conn )
    	{
    		// select the database
    	    if(mysql_select_db( $this->_db, $this->_conn ))
    	    {
    	    	$this->_isConnected = true;

    	    	// return the connection resource
    			return $this->_conn;
    	    }
    	}

    	return false;
    }


    /**
     * MySQL::close()
     *
     * Close the connection
     *
     * @return bool
     * @access public
     * @author Teye Heimans
     */
    function close()
    {
        if( $this->_isConnected )
        {
            $this->_isConnected = false;
            return mysql_close( $this->_conn );
        }

        return true;
    }

    /**
     * MySQL::query()
     *
     * Execute the query
     *
     * @param string $query: the query which should be executed
     * @return resource
     * @access public
     * @author Teye Heimans
     */
    function query( $query )
    {
    	$this->_lastQuery = $query;

        return mysql_query( $query, $this->_conn );
    }

    /**
     * MySQL::getInsertId()
     *
     * Get the id of the last inserted record
     *
     * @return int
     * @access public
     * @author Teye Heimans
     */
    function getInsertId()
    {
        return mysql_insert_id();
    }

    /**
     * MySQL::result()
     *
     * Return a specific result of a sql resource
     *
     * @param resource $sql: The sql where you want to get a result from
     * @param int $row: The row where you want a result from
     * @param string $field: The field which result you want
     * @return string
     * @access public
     * @author Teye Heimans
     */
    function result( $sql, $row = 0, $field = null )
    {
    	return mysql_result( $sql, $row, $field );
    }

    /**
     * MySQL::getError()
     *
     * Return the last error
     *
     * @return string
     * @access public
     * @author Teye Heimans
     */
    function getError()
    {
        return mysql_error();
    }

    /**
     * MySQL::getErrorNo()
     *
     * Return the error number
     *
     * @return int
     * @access public
     * @author Teye Heimans
     */
    function getErrorNo()
    {
        return mysql_errno();
    }

    /**
     * MySQL::recordCount()
     *
     * Return the number of records found by the query
     *
     * @param resource $sql: The resource which should be counted
     * @return int
     * @access public
     * @author Teye Heimans
     */
    function recordCount( $sql )
    {
        return mysql_num_rows( $sql );
    }

    /**
     * MySQL::getRecord()
     *
     * Fetch a record in assoc mode and return it
     *
     * @param resource $sql: The resource which should be used to retireve a record from
     * @return assoc array or false when there are no records left
     * @access public
     * @author Teye Heimans
     */
    function getRecord( $sql )
    {
        return mysql_fetch_assoc( $sql );
    }

    /**
     * MySQL::getFieldNames()
     *
     * Return the field names of the table
     *
     * @param string $table: The table where the field names should be collected from
     * @return array
     * @access public
     * @author Teye Heimans
     */
    function getFieldNames( $table )
    {
        $t = strtolower($table);

        // return the data from the cache if it exists
        if( isset( $this->_cache['fields'][$t] ) )
        {
            return $this->_cache['fields'][$t];
        }

        $result = array();

        // check if we have a connection handler..
        // if so, fetch the column names
        if( $this->_conn && !empty($this->_db) )
        {
            $fields  = mysql_list_fields( $this->_db, $table, $this->_conn );
            $columns = mysql_num_fields($fields);

            for ($i = 0; $i < $columns; $i++)
            {
                $result[] = mysql_field_name($fields, $i);
            }
        }
        // no connection handler available
        else
        {
            // try to get a record and fetch the field names..
            $sql = $this->query( 'DESCRIBE ' . $this->quote( $table ) );

            // query succeeded?
            if( $sql )
            {
            	while( $row = mysql_fetch_assoc( $sql ) )
            	{
            		$result[] = $row['Field'];
            	}
            }
            else
            {
            	trigger_error(
	    		  "Could not retrieve the field names for the table '".$table."'.\n".
	    		  "Query: ".$this->getLastQuery()."\n".
	    		  "Error: ".$this->getError(),
	    		  E_USER_WARNING
	    		);
	    		return false;
            }

            mysql_free_result( $sql );
        }

        // save the result in the cache
        $this->_cache['fields'][$t] = $result;

        return $result;
    }

    /**
     * MySQL::getTables()
     *
     * Return the tables from the database
     *
     * @return array
     * @access public
     * @author Teye Heimans
     */
    function getTables()
    {
        // return the data from the cache if it exists
        if( isset( $this->_cache['tables'] ) )
        {
            return $this->_cache['tables'];
        }

        $sql = $this->query('SHOW TABLES;');

        // query failed ?
        if( !$sql )
        {
            trigger_error(
    		  "Could not retrieve the tables from the database!\n".
    		  "Query: ".$this->getLastQuery()."\n".
    		  "Error: ".$this->getError(),
    		  E_USER_WARNING
    		);
    		return false;
        }

        // save the table names in an array and return them
        $result = array();
        $num = $this->recordCount( $sql );
        for( $i = 0; $i < $num; $i++ )
        {
            $result[] = $this->result( $sql, $i);
        }

        // save the result in the cache
    	$this->_cache['tables'] = $result;

        return $result;
    }

    /**
     * MySQL::getNotNullFields()
     *
     * Retrieve the fields that can not contain NULL
     *
     * @param string $table: The table which fields we should retrieve
     * @return array
     * @access public
     * @author Teye Heimans
     */
    function getNotNullFields ( $table )
    {
        $t = strtolower($table);

        // return the data from the cache if it exists
        if( isset( $this->_cache['notnull'][$t] ) )
        {
            return $this->_cache['notnull'][$t];
        }

    	$sql = $this->query('DESCRIBE '.$this->quote( $table ) );

    	if( $sql )
    	{
    	    // save the not null fields in an array
	    	$result = array();
	    	while( $r = mysql_fetch_assoc( $sql ) ) {
	    		if( $r['Null'] == 'NO' || empty($r['Null']) ) {
	    			$result[] = $r['Field'];
	    		}
	    	}
    	}
    	else
    	{
    	    // display the error message when the not null fields could not be retrieved
    		trigger_error(
    		  "Could not retrieve the not-null-field from the table '".$table."'.\n".
    		  "Query: ".$this->getLastQuery()."\n".
    		  "Error: ".$this->getError(),
    		  E_USER_WARNING
    		);
    		return false;
    	}

    	// save the result in the cache
    	$this->_cache['notnull'][$t] = $result;

        return $result;
    }

    /**
     * MySQL::getFieldTypes()
     *
     * Retrieve the field types of the given table
     *
     * @param string $table: The table where we should fetch the fields and their types from
     * @return array
     * @access public
     * @author Teye Heimans
     */
    function getFieldTypes( $table )
    {
        $t = strtolower($table);

        // return the data from the cache if it exists
        if( isset( $this->_cache['fieldtypes'][$t] ) )
        {
            return $this->_cache['fieldtypes'][$t];
        }

        // Get the default values for the fields
        $sql = $this->query("DESCRIBE ".$this->quote($table));

        // query failed ?
        if( !$sql )
        {
            trigger_error(
    		  "Could not fetch the meta data of the columns for table '".$table."'.\n".
    		  "Query: ".$this->getLastQuery()."\n".
    		  "Error: ".$this->getError(),
    		  E_USER_WARNING
    		);
    		return false;
        }

        $result = array();
        while( $row = $this->getRecord( $sql ) )
        {
            // split the size from the type
            if( preg_match('/^(.*)\((\d+)\)$/', $row['Type'], $match) )
            {
                $type = $match[1];
                $length = $match[2];
            }
            else
            {
                $type   = $row['Type'];
                $length = null;
            }

            $result[ $row['Field'] ] = array(
              $type,
              $length,
              $row['Default']
            );
        }

        // save the result in the cache
    	$this->_cache['fieldtypes'][$t] = $result;

		return $result;
    }

    /**
     * MySQL::escapeString()
     *
     * Escape the string we are going to save from dangerous characters
     *
     * @param string $string: The string to escape
     * @return string
     * @access public
     * @author Teye Heimans
     */
    function escapeString( $string )
    {
        return mysql_real_escape_string( $string );
    }

    /**
     * MySQL::getPrKeys()
     *
     * Fetch the keys from the table
     *
     * @param string $table: The table where we should fetch the keys from
     * @return array of the keys which are found
     * @access public
     * @author Teye Heimans
     */
    function getPrKeys( $table )
    {
        $t = strtolower($table);

        // return the data from the cache if it exists
        if( isset( $this->_cache['keys'][$t] ) ) {
            return $this->_cache['keys'][$t];
        }

        $sql = $this->query("SHOW KEYS FROM `".$table."`");

        $keys = array();
        while( $r = $this->getRecord($sql) ) {
            if ( $r['Key_name'] == 'PRIMARY' ) {
                $keys[] = $r['Column_name'];
            }
        }

        mysql_free_result($sql);

        // save the result in the cache
        $this->_cache['keys'][$t] = $keys;

        return $keys;
    }

    /**
     * MySQL::getUniqueFields()
     *
     * Fetch the unique fields from the table
     *
     * @param string $table: The table where the unique-value-field should be collected from
     * @return array: multidimensional array of the unique indexes on the table
     * @access public
     * @author Teye Heimans
     */
    function getUniqueFields( $table )
    {
        $t = strtolower( $table );

        // return the data from the cache if it exists
        if( isset( $this->_cache['unique'][$t] ) )
        {
            return $this->_cache['unique'][$t];
        }

        // get the keys
        $sql = $this->query("SHOW KEYS FROM ". $this->quote($table) );

        $unique = array();

        // save all keys which have to be unique
        while( $r = $this->getRecord($sql) )
        {
            if ( $r['Non_unique'] == 0 )
            {
                $unique[$r['Key_name']][] = $r['Column_name'];
            }
        }

        mysql_free_result($sql);

        // save the result in the cache
        $this->_cache['unique'][$t] = $unique;

        return $unique;
    }
}

?>
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