remove log_time index (was not used at all)

At the same time the database updater now supports checking for existing indexes. The db tools will not have this in 3.0.6 (the db tools have a function to retrieve all indexes) and i need to test the updater on all DBMS today...

git-svn-id: file:///svn/phpbb/branches/phpBB-3_0_0@10183 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/docs/CHANGELOG.html

@@ -212,7 +212,6 @@
 		<li>[Fix] Correctly display underlined links placed in last line in viewtopic. (Bug #14811 - Patch by primehalo)</li>
 		<li>[Change] submit_post() now accepts force_approved_state key passed to $data to indicate new posts being approved (true) or unapproved (false).</li>
 		<li>[Change] Change the data format of the default file ACM to be more secure from tampering and have better performance.</li>
-		<li>[Change] Add index on log_time to the log table to prevent slowdown on boards with many log entries. (Bug #44665 - Patch by bantu)</li>
 		<li>[Change] Template engine now permits to a limited extent variable includes.</li>
 		<li>[Change] Quote BBCode no longer requires the f_reply permission. (Bug #16079)</li>
 		<li>[Change] Banning/unbanning users now generates an entry in their user notes (Bug #21825 - Patch by nickvergessen)</li>

phpBB/install/database_update.php

@@ -8,7 +8,7 @@
 *
 */
 
-$updates_to_version = '3.0.6-RC1';
+$updates_to_version = '3.0.6-RC2';
 
 // Enter any version to update from to test updates. The version within the db will not be updated.
 $debug_from_version = false;
@@ -868,9 +868,6 @@ function database_update_info()
 				),
 			),
 			'add_index'		=> array(
-				LOG_TABLE			=> array(
-					'log_time'		=> array('log_time'),
-				),
 				REPORTS_TABLE		=> array(
 					'post_id'		=> array('post_id'),
 					'pm_id'			=> array('pm_id'),
@@ -880,6 +877,12 @@ function database_update_info()
 				),
 			),
 		),
+		// Changes from 3.0.6-RC1 to 3.0.6-RC2
+		'3.0.6-RC1'		=> array(
+			'drop_keys'		=> array(
+				LOG_TABLE			=> array('log_time'),
+			),
+		),
 	);
 }
 
@@ -1506,6 +1509,16 @@ function change_database_data(&$no_updates, $version)
 
 			$no_updates = false;
 		break;
+
+		// Changes from 3.0.6-RC1 to 3.0.6-RC2
+		case '3.0.6-RC1':
+
+			// We check if there is an index for log_time within the logs table
+
+
+			// If so, we remove it
+
+		break;
 	}
 }
 
@@ -1902,7 +1915,8 @@ class updater_db_tools
 					{
 						if ($column_exists)
 						{
-							$sqlite_data[$table]['change_columns'][] = $result;
+							continue;
+//							$sqlite_data[$table]['change_columns'][] = $result;
 						}
 						else
 						{
@@ -1924,6 +1938,11 @@ class updater_db_tools
 			{
 				foreach ($indexes as $index_name)
 				{
+					if (!$this->sql_index_exists($table, $index_name))
+					{
+						continue;
+					}
+
 					$result = $this->sql_index_drop($table, $index_name);
 
 					if ($this->return_statements)
@@ -1984,6 +2003,11 @@ class updater_db_tools
 			{
 				foreach ($index_array as $index_name => $column)
 				{
+					if ($this->sql_index_exists($table, $index_name))
+					{
+						continue;
+					}
+
 					$result = $this->sql_create_unique_index($table, $index_name, $column);
 
 					if ($this->return_statements)
@@ -2001,6 +2025,11 @@ class updater_db_tools
 			{
 				foreach ($index_array as $index_name => $column)
 				{
+					if ($this->sql_index_exists($table, $index_name))
+					{
+						continue;
+					}
+
 					$result = $this->sql_create_index($table, $index_name, $column);
 
 					if ($this->return_statements)
@@ -2308,6 +2337,98 @@ class updater_db_tools
 		}
 	}
 
+	/**
+	* Check if a specified index exists in table
+	*
+	* @param string	$table_name		Table to check the index at
+	* @param string	$index_name		The index name to check
+	*
+	* @return bool True if index exists, else false
+	*/
+	function sql_index_exists($table_name, $index_name)
+	{
+		if ($this->sql_layer == 'mssql')
+		{
+			$sql = "EXEC sp_statistics '$table_name'";
+			$result = $this->db->sql_query($sql);
+
+			while ($row = $this->db->sql_fetchrow($result))
+			{
+				if ($row['TYPE'] == 3)
+				{
+					if (strtolower($row['INDEX_NAME']) == strtolower($index_name))
+					{
+						$this->db->sql_freeresult($result);
+						return true;
+					}
+				}
+			}
+			$this->db->sql_freeresult($result);
+
+			return false;
+		}
+
+		switch ($this->sql_layer)
+		{
+			case 'firebird':
+				$sql = "SELECT LOWER(RDB\$INDEX_NAME) as index_name
+					FROM RDB\$INDICES
+					WHERE RDB\$RELATION_NAME = " . strtoupper($table_name) . "
+						AND RDB\$UNIQUE_FLAG IS NULL
+						AND RDB\$FOREIGN_KEY IS NULL";
+				$col = 'index_name';
+			break;
+
+			case 'postgres':
+				$sql = "SELECT ic.relname as index_name
+					FROM pg_class bc, pg_class ic, pg_index i
+					WHERE (bc.oid = i.indrelid)
+						AND (ic.oid = i.indexrelid)
+						AND (bc.relname = '" . $table_name . "')
+						AND (i.indisunique != 't')
+						AND (i.indisprimary != 't')";
+				$col = 'index_name';
+			break;
+
+			case 'mysql_40':
+			case 'mysql_41':
+				$sql = 'SHOW KEYS
+					FROM ' . $table_name;
+				$col = 'Key_name';
+			break;
+
+			case 'oracle':
+				$sql = "SELECT index_name
+					FROM user_indexes
+					WHERE table_name = '" . $table_name . "'
+						AND generated = 'N'";
+			break;
+
+			case 'sqlite':
+				$sql = "PRAGMA index_info('" . $table_name . "');";
+				$col = 'name';
+			break;
+		}
+
+		$result = $this->db->sql_query($sql);
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && !$row['Non_unique'])
+			{
+				continue;
+			}
+
+			if (strtolower($row[$col]) == strtolower($index_name))
+			{
+				$this->db->sql_freeresult($result);
+				return true;
+			}
+		}
+		$this->db->sql_freeresult($result);
+
+		return false;
+	}
+
 	/**
 	* Private method for performing sql statements (either execute them or return them)
 	* @access private