<?php

/**
 * A class that implements the DB interface for Postgres
 * Note: This class uses ADODB and returns RecordSets.
 *
 * $Id: Postgres74.php,v 1.44.2.1 2005/06/16 14:12:49 chriskl Exp $
 */

include_once('./classes/database/Postgres73.php');

class Postgres74 extends Postgres73 {

	// Last oid assigned to a system object
	var $_lastSystemOID = 17137;

	// Max object name length
	var $_maxNameLen = 63;
	
	// How often to execute the trigger	
	var $triggerFrequency = array('ROW','STATEMENT');

	/**
	 * Constructor
	 * @param $conn The database connection
	 */
	function Postgres74($conn) {
		$this->Postgres73($conn);
	}

	// Help functions
	
	function &getHelpPages() {
		include_once('./help/PostgresDoc74.php');
		return $this->help_page;
	}

	// Database functions
	
	/**
	 * Alters a database
	 * the multiple return vals are for postgres 8+ which support more functionality in alter database
	 * @param $dbName The name of the database
	 * @param $newName new name for the database
	 * @param $newOwner The new owner for the database
	 * @return 0 success
	 * @return -1 transaction error
	 * @return -2 owner error
	 * @return -3 rename error
	 */
	function alterDatabase($dbName, $newName, $newOwner = '')
	{
		//ignore $newowner, not supported pre 8.0
		$this->clean($dbName);
		$this->clean($newName);
		
		$status = $this->alterDatabaseRename($dbName, $newName);
		if ($status != 0) return -3;
		else return 0;
	}
	
	/**
	 * Renames a database, note that this operation cannot be 
	 * performed on a database that is currently being connected to
	 * @param string $oldName name of database to rename
	 * @param string $newName new name of database
	 * @return int 0 on success
	 */
	function alterDatabaseRename($oldName, $newName) {
		$this->clean($oldName);
		$this->clean($newName);
		
		if ($oldName != $newName) {
			$sql = "ALTER DATABASE \"{$oldName}\" RENAME TO \"{$newName}\"";
			return $this->execute($sql);
		}
		else //just return success, we're not going to do anything
			return 0;
	}
	
	// Table functions
	
	/**
	 * Get the fields for uniquely identifying a row in a table
	 * @param $table The table for which to retrieve the identifier
	 * @return An array mapping attribute number to attribute name, empty for no identifiers
	 * @return -1 error
	 */
	function getRowIdentifier($table) {
		$oldtable = $table;
		$this->clean($table);
		
		$status = $this->beginTransaction();
		if ($status != 0) return -1;
		
		// Get the first primary or unique index (sorting primary keys first) that
		// is NOT a partial index.
		$sql = "SELECT indrelid, indkey FROM pg_catalog.pg_index WHERE indisunique AND 
			indrelid=(SELECT oid FROM pg_catalog.pg_class WHERE relname='{$table}' AND
			relnamespace=(SELECT oid FROM pg_catalog.pg_namespace WHERE nspname='{$this->_schema}'))
			AND indpred IS NULL AND indexprs IS NULL ORDER BY indisprimary DESC LIMIT 1";
		$rs = $this->selectSet($sql);

		// If none, check for an OID column.  Even though OIDs can be duplicated, the edit and delete row
		// functions check that they're only modiying a single row.  Otherwise, return empty array.
		if ($rs->recordCount() == 0) {			
			// Check for OID column
			$temp = array();
			if ($this->hasObjectID($table)) {
				$temp = array('oid');
			}
			$this->endTransaction();
			return $temp;
		}
		// Otherwise find the names of the keys
		else {
			$attnames = $this->getAttributeNames($oldtable, explode(' ', $rs->f['indkey']));
			if (!is_array($attnames)) {
				$this->rollbackTransaction();
				return -1;
			}
			else {
				$this->endTransaction();
				return $attnames;
			}
		}			
	}

	/**
	 * Sets up the data object for a dump.  eg. Starts the appropriate
	 * transaction, sets variables, etc.
	 * @return 0 success
	 */
	function beginDump() {
		$status = parent::beginDump();
		if ($status != 0) return $status;
		
		// Set extra_float_digits to 2
		$sql = "SET extra_float_digits TO 2";
		$status = $this->execute($sql);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -1;
		}
	}

	// Group functions
	
	/**
	 * Return users in a specific group
	 * @param $groname The name of the group
	 * @return All users in the group
	 */
	function &getGroup($groname) {
		$this->clean($groname);

		$sql = "SELECT s.usename FROM pg_catalog.pg_user s, pg_catalog.pg_group g 
					WHERE g.groname='{$groname}' AND s.usesysid = ANY (g.grolist)
					ORDER BY s.usename";

		return $this->selectSet($sql);
	}
	
	// Schema functions
	
	/**
	 * Return all schemas in the current database.  This differs from the version
	 * in 7.3 only in that it considers the information_schema to be a system schema.
	 * @return All schemas, sorted alphabetically
	 */
	function &getSchemas() {
		global $conf;
		
		if (!$conf['show_system']) $and = "WHERE nspname NOT LIKE 'pg\\\\_%' AND nspname != 'information_schema'";
		else $and = "WHERE nspname !~ '^pg_t(emp_[0-9]+|oast)$'";
		$sql = "SELECT pn.nspname, pu.usename AS nspowner, pg_catalog.obj_description(pn.oid, 'pg_namespace') AS nspcomment
                        FROM pg_catalog.pg_namespace pn
                        JOIN pg_catalog.pg_user pu ON (pn.nspowner = pu.usesysid)
                        {$and} ORDER BY nspname";

		return $this->selectSet($sql);
	}	

	// Index functions
	
	/**
	 * Grabs a list of indexes for a table
	 * @param $table The name of a table whose indexes to retrieve
	 * @param $unique Only get unique/pk indexes
	 * @return A recordset
	 */
	function &getIndexes($table = '', $unique = false) {
		$this->clean($table);

		$sql = "SELECT c2.relname AS indname, i.indisprimary, i.indisunique, i.indisclustered,
			pg_catalog.pg_get_indexdef(i.indexrelid, 0, true) AS inddef
			FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
			WHERE c.relname = '{$table}' AND pg_catalog.pg_table_is_visible(c.oid) 
			AND c.oid = i.indrelid AND i.indexrelid = c2.oid
		";
		if ($unique) $sql .= " AND i.indisunique ";
		$sql .= " ORDER BY c2.relname";

		return $this->selectSet($sql);
	}

	// View functions
	
	/**
	 * Returns all details for a particular view
	 * @param $view The name of the view to retrieve
	 * @return View info
	 */
	function &getView($view) {
		$this->clean($view);
		
		$sql = "SELECT c.relname, pg_catalog.pg_get_userbyid(c.relowner) AS relowner, 
                          pg_catalog.pg_get_viewdef(c.oid, true) AS vwdefinition, pg_catalog.obj_description(c.oid, 'pg_class') AS relcomment
                        FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace)
                        WHERE (c.relname = '$view')
                        AND n.nspname='{$this->_schema}'";
 
		return $this->selectSet($sql);
	}	

	// Trigger functions
	
	/**
	 * Grabs a list of triggers on a table
	 * @param $table The name of a table whose triggers to retrieve
	 * @return A recordset
	 */
	function &getTriggers($table = '') {
		$this->clean($table);

		$sql = "SELECT t.tgname, pg_catalog.pg_get_triggerdef(t.oid) AS tgdef
			FROM pg_catalog.pg_trigger t
			WHERE t.tgrelid = (SELECT oid FROM pg_catalog.pg_class WHERE relname='{$table}'
			AND relnamespace=(SELECT oid FROM pg_catalog.pg_namespace WHERE nspname='{$this->_schema}'))
			AND (NOT tgisconstraint OR NOT EXISTS
			(SELECT 1 FROM pg_catalog.pg_depend d    JOIN pg_catalog.pg_constraint c
			ON (d.refclassid = c.tableoid AND d.refobjid = c.oid)
			WHERE d.classid = t.tableoid AND d.objid = t.oid AND d.deptype = 'i' AND c.contype = 'f'))";

		return $this->selectSet($sql);
	}

	// Constraint functions

	/**
	 * Returns a list of all constraints on a table
	 * @param $table The table to find rules for
	 * @return A recordset
	 */
	function &getConstraints($table) {
		$this->clean($table);

		// This SQL is greatly complicated by the need to retrieve
		// index clustering information for primary and unique constraints
		$sql = "SELECT
				pc.conname,
				pg_catalog.pg_get_constraintdef(pc.oid, true) AS consrc,
				pc.contype,
				CASE WHEN pc.contype='u' OR pc.contype='p' THEN (
					SELECT
						indisclustered
					FROM
						pg_catalog.pg_depend pd,
						pg_catalog.pg_class pl,
						pg_catalog.pg_index pi
					WHERE
						pd.refclassid=pc.tableoid 
						AND pd.refobjid=pc.oid
						AND pd.objid=pl.oid
						AND pl.oid=pi.indexrelid
				) ELSE
					NULL
				END AS indisclustered
			FROM
				pg_catalog.pg_constraint pc
			WHERE
				pc.conrelid = (SELECT oid FROM pg_catalog.pg_class WHERE relname='{$table}'
					AND relnamespace = (SELECT oid FROM pg_catalog.pg_namespace
					WHERE nspname='{$this->_schema}'))
			ORDER BY
				1
		";

		return $this->selectSet($sql);
	}

	// Administration functions

	/**
	 * Recluster a table or all the tables in the current database
	 * @param $table (optional) The table to recluster
	 */
	function recluster($table = '') {
		if ($table != '') {
			$this->fieldClean($table);
			$sql = "CLUSTER \"{$table}\"";
		}
		else
			$sql = "CLUSTER";

		return $this->execute($sql);
	}

	// Domain functions
	
	/**
	 * Get domain constraints
	 * @param $domain The name of the domain whose constraints to fetch
	 * @return A recordset
	 */
	function &getDomainConstraints($domain) {
		$this->clean($domain);
		
		$sql = "
			SELECT
				conname,
				contype,
				pg_catalog.pg_get_constraintdef(oid, true) AS consrc
			FROM
				pg_catalog.pg_constraint
			WHERE
				contypid = (SELECT oid FROM pg_catalog.pg_type
								WHERE typname='{$domain}'
								AND typnamespace = (SELECT oid FROM pg_catalog.pg_namespace
															WHERE nspname = '{$this->_schema}'))
			ORDER BY
				conname";
				
		return $this->selectSet($sql);
	}
	
	/**
	 * Drops a domain constraint
	 * @param $domain The domain from which to remove the constraint
	 * @param $constraint The constraint to remove
	 * @param $cascade True to cascade, false otherwise
	 * @return 0 success
	 */
	function dropDomainConstraint($domain, $constraint, $cascade) {
		$this->fieldClean($domain);
		$this->fieldClean($constraint);
		
		$sql = "ALTER DOMAIN \"{$domain}\" DROP CONSTRAINT \"{$constraint}\"";
		if ($cascade) $sql .= " CASCADE";

		return $this->execute($sql);
	}

	/**
	 * Adds a check constraint to a domain
	 * @param $domain The domain to which to add the check
	 * @param $definition The definition of the check
	 * @param $name (optional) The name to give the check, otherwise default name is assigned
	 * @return 0 success
	 */
	function addDomainCheckConstraint($domain, $definition, $name = '') {
		$this->fieldClean($domain);
		$this->fieldClean($name);

		$sql = "ALTER DOMAIN \"{$domain}\" ADD ";
		if ($name != '') $sql .= "CONSTRAINT \"{$name}\" ";
		$sql .= "CHECK ({$definition})";

		return $this->execute($sql);
	}
	
	/**
	 * Alters a domain
	 * @param $domain The domain to alter
	 * @param $domdefault The domain default
	 * @param $domnotnull True for NOT NULL, false otherwise
	 * @param $domowner The domain owner
	 * @return 0 success
	 * @return -1 transaction error
	 * @return -2 default error
	 * @return -3 not null error
	 * @return -4 owner error
	 */
	function alterDomain($domain, $domdefault, $domnotnull, $domowner) {
		$this->fieldClean($domain);
		$this->fieldClean($domowner);
		
		$status = $this->beginTransaction();
		if ($status != 0) {
			$this->rollbackTransaction();
			return -1;
		}
		
		// Default
		if ($domdefault == '')
			$sql = "ALTER DOMAIN \"{$domain}\" DROP DEFAULT";
		else
			$sql = "ALTER DOMAIN \"{$domain}\" SET DEFAULT {$domdefault}";
		
		$status = $this->execute($sql);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -2;
		}
		
		// NOT NULL
		if ($domnotnull)
			$sql = "ALTER DOMAIN \"{$domain}\" SET NOT NULL";
		else
			$sql = "ALTER DOMAIN \"{$domain}\" DROP NOT NULL";

		$status = $this->execute($sql);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -3;
		}
		
		// Owner
		$sql = "ALTER DOMAIN \"{$domain}\" OWNER TO \"{$domowner}\"";

		$status = $this->execute($sql);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -4;
		}
		
		return $this->endTransaction();
	}	

	// User functions

	/**
	 * Renames a user
	 * @param $username The username of the user to rename
	 * @param $newname The new name of the user
	 * @return 0 success
	 */
	function renameUser($username, $newname){
		$this->fieldClean($username);
		$this->fieldClean($newname);

		$sql = "ALTER USER \"{$username}\" RENAME TO \"{$newname}\"";

		return $this->execute($sql);
	}

	/**
	 * Adjusts a user's info and renames the user
	 * @param $username The username of the user to modify
	 * @param $password A new password for the user
	 * @param $createdb boolean Whether or not the user can create databases
	 * @param $createuser boolean Whether or not the user can create other users
	 * @param $expiry string Format 'YYYY-MM-DD HH:MM:SS'.  '' means never expire.
	 * @param $newname The new name of the user
	 * @return 0 success
	 * @return -1 transaction error
	 * @return -2 set user attributes error
	 * @return -3 rename error
	 */
	function setRenameUser($username, $password, $createdb, $createuser, $expiry, $newname) {
		$status = $this->beginTransaction();
		if ($status != 0) return -1;

		$status = $this->setUser($username, $password, $createdb, $createuser, $expiry);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -2;
		}

		if ($username != $newname){
			$status = $this->renameUser($username, $newname);
			if ($status != 0) {
				$this->rollbackTransaction();
				return -3;
			}
		}

		return $this->endTransaction();
	}

	// Function functions

	/**
	 * Updates (replaces) a function.
	 * @param $function_oid The OID of the function
	 * @param $funcname The name of the function to create
	 * @param $newname The new name for the function
	 * @param $args The array of argument types
	 * @param $returns The return type
	 * @param $definition The definition for the new function
	 * @param $language The language the function is written for
	 * @param $flags An array of optional flags
	 * @param $setof True if returns a set, false otherwise
	 * @param $comment The comment on the function	 
	 * @return 0 success
	 * @return -1 transaction error
	 * @return -3 create function error
	 * @return -4 comment error
	 * @return -5 rename function error
	 */
	function setFunction($function_oid, $funcname, $newname, $args, $returns, $definition, $language, $flags, $setof, $comment) {
		// Begin a transaction
		$status = $this->beginTransaction();
		if ($status != 0) {
			$this->rollbackTransaction();
			return -1;
		}

		// Replace the existing function
		$status = $this->createFunction($funcname, $args, $returns, $definition, $language, $flags, $setof, true);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -3;
		}

		// Comment on the function
		$this->fieldClean($funcname);
		$this->clean($comment);
		$status = $this->setComment('FUNCTION', "\"{$funcname}\"({$args})", null, $comment);
		if ($status != 0) {
			$this->rollbackTransaction();
			return -4;
		}

		// Rename the function, if necessary
		$this->fieldClean($newname);
		if ($funcname != $newname) {
			$sql = "ALTER FUNCTION \"{$funcname}\"({$args}) RENAME TO \"{$newname}\"";
			$status = $this->execute($sql);
			if ($status != 0) {
				$this->rollbackTransaction();
				return -5;
			}
		}
		
		return $this->endTransaction();
	}
	
	// Capabilities
	function hasAlterDatabaseRename() { return true; }
	function hasGrantOption() { return true; }
	function hasDomainConstraints() { return true; }
	function hasUserRename() { return true; }
	function hasRecluster() { return true; }
	
}

?>