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#19690852 Refactoring: extracted the code for creating the "group by" and "order by" queries in separate functions. Replaced "inst_num", "orderby_num" and "groupby_num" with LIMIT.
git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0@8309 201d5d3c-b55e-5fd7-737f-ddc643e51545
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mosmartin
parent
8d2f988ee6
commit
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1 changed files with 133 additions and 161 deletions
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@ -923,105 +923,17 @@
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if ($output->list_count && $output->page) {
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return ($this->_getNavigationData($table_list, $columns, $left_join, $condition, $output));
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}
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$condition = $this->limitResultIfOrderByIsUsed($output->order, $condition);
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if ($output->order) {
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$conditions = $this->getConditionList($output);
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//if(in_array('list_order', $conditions) || in_array('update_order', $conditions)) {
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foreach($output->order as $key => $val) {
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$col = $val[0];
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if(!in_array($col, array('list_order','update_order'))) continue;
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if ($condition) $condition .= sprintf(' and %s < 2100000000 ', $col);
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else $condition = sprintf(' where %s < 2100000000 ', $col);
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}
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//}
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}
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if (count ($output->groups)) {
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foreach ($output->groups as $key => $value) {
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if (strpos ($value, '.')) {
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$tmp = explode ('.', $value);
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$tmp[0] = sprintf ('"%s"', $tmp[0]);
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$tmp[1] = sprintf ('"%s"', $tmp[1]);
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$value = implode ('.', $tmp);
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}
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elseif (strpos ($value, '(')) {
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$value = $value;
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}
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else {
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$value = sprintf ('"%s"', $value);
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}
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$output->groups[$key] = $value;
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if(count($output->arg_columns))
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{
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if($column_list[$value]) $output->arg_columns[] = $column_list[$value];
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}
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}
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$groupby_query = sprintf ('group by %s', implode(',', $output->groups));
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}
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// apply when using list_count
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if ($output->list_count['value']) {
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$start_count = 0;
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$list_count = $output->list_count['value'];
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if ($output->order) {
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foreach ($output->order as $val) {
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if (strpos ($val[0], '.')) {
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$tmpval = explode ('.', $val[0]);
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$tmpval[0] = sprintf ('"%s"', $tmpval[0]);
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$tmpval[1] = sprintf ('"%s"', $tmpval[1]);
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$val[0] = implode ('.', $tmpval);
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}
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elseif (strpos ($val[0], '(')) $val[0] = $val[0];
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elseif ($val[0] == 'count') $val[0] = 'count (*)';
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else $val[0] = sprintf ('"%s"', $val[0]);
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$index_list[] = sprintf('%s %s', $val[0], $val[1]);
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}
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if (count($index_list))
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$orderby_query = ' order by '.implode(',', $index_list);
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$orderby_query = sprintf ('%s for orderby_num() between %d and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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else {
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if (count ($output->groups)) {
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$orderby_query = sprintf ('%s having groupby_num() between %d'. ' and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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else {
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if ($condition) {
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$orderby_query = sprintf ('%s and inst_num() between %d'. ' and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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else {
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$orderby_query = sprintf ('%s where inst_num() between %d'. ' and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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}
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}
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}
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else {
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if ($output->order) {
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foreach ($output->order as $val) {
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if (strpos ($val[0], '.')) {
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$tmpval = explode ('.', $val[0]);
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$tmpval[0] = sprintf ('"%s"', $tmpval[0]);
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$tmpval[1] = sprintf ('"%s"', $tmpval[1]);
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$val[0] = implode ('.', $tmpval);
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}
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elseif (strpos ($val[0], '(')) $val[0] = $val[0];
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elseif ($val[0] == 'count') $val[0] = 'count (*)';
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else $val[0] = sprintf ('"%s"', $val[0]);
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$index_list[] = sprintf('%s %s', $val[0], $val[1]);
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if(count($output->arg_columns) && $column_list[$val]) $output->arg_columns[] = $column_list[$key];
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}
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if (count ($index_list)) {
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$orderby_query = ' order by '.implode(',', $index_list);
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}
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}
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}
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// group by
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$groupby_query = $this->getGroupByClause($output->groups);
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// order by
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$orderby_query = $this->getOrderByClause($output->order);
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// limit
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$limit_query = $this->getLimitClause(0, $output->list_count['value']);
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if(count($output->arg_columns))
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{
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@ -1034,7 +946,7 @@
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$columns = join(',',$columns);
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}
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$query = sprintf ("select %s from %s %s %s %s", $columns, implode (',',$table_list), implode (' ',$left_join), $condition, $groupby_query.$orderby_query);
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$query = sprintf ("select %s from %s %s %s %s", $columns, implode (',',$table_list), implode (' ',$left_join), $condition, $groupby_query.$orderby_query.$limit_query);
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$query .= (__DEBUG_QUERY__&1 && $output->query_id)?sprintf (' '.$this->comment_syntax, $this->query_id):'';
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$result = $this->_query ($query);
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if ($this->isError ()) return;
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@ -1046,6 +958,118 @@
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return $buff;
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}
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/**
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* @brief Retrieve text for limit clause
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*
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* Example: SELECT * FROM xe_modules LIMIT 20
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*
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**/
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function getLimitClause($offset, $row_count){
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if(!$row_count) return '';
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if($offset === 0)
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return sprintf(' limit %d', $row_count);
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return sprintf(' limit %d, %d', $offset, $row_count);
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}
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/**
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* @brief Retrieve text for order by clause
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*
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* Example: SELECT * FROM xe_modules ORDER BY list_order, regdate
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*
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**/
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function getOrderByClause($order_list){
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if(!$order_list) return '';
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foreach ($order_list as $val) {
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// Parse column names
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if (strpos ($val[0], '.')) {
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$tmpval = explode ('.', $val[0]);
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$tmpval[0] = sprintf ('"%s"', $tmpval[0]);
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$tmpval[1] = sprintf ('"%s"', $tmpval[1]);
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$val[0] = implode ('.', $tmpval);
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}
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elseif (strpos ($val[0], '(')) $val[0] = $val[0];
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elseif ($val[0] == 'count') $val[0] = 'count(*)';
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else $val[0] = sprintf ('"%s"', $val[0]);
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// Save name
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$index_list[] = sprintf('%s %s', $val[0], $val[1]);
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// 1. This if never gets executed: column names are alias in $column_list but with real name in order clause
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// 2. There is no need for the columns in the order by clause to also show up in the select statement
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/*
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if(count($output->arg_columns) && $column_list[$val[0]])
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$output->arg_columns[] = $column_list[$val[0]];
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*/
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}
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if (count($index_list)) {
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return ' order by '.implode(',', $index_list);
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}
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return '';
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}
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/**
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* @brief Retrieve text for group by clause
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*
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* Example: SELECT substr(regdate, 1, 8), count(*) FROM xe_modules GROUP BY substr(regdate, 1, 8)
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*
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**/
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function getGroupByClause($group_list){
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if(!$group_list) return '';
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if(!count($group_list)) return '';
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foreach ($group_list as $key => $value) {
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// If value is qualified table name
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if (strpos ($value, '.')) {
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$tmp = explode ('.', $value);
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$tmp[0] = sprintf ('"%s"', $tmp[0]);
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$tmp[1] = sprintf ('"%s"', $tmp[1]);
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$value = implode ('.', $tmp);
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}
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// If value is an expression
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elseif (strpos ($value, '(')) {
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$value = $value;
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}
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else {
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$value = sprintf ('"%s"', $value);
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}
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// Update
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$group_list[$key] = $value;
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/*
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* The same as with order by - columns in "group by" do not need to be in the select clause
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if(count($output->arg_columns))
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{
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if($column_list[$value]) $output->arg_columns[] = $column_list[$value];
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}
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*/
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}
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return sprintf ('group by %s', implode(',', $group_list));
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}
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/**
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* @brief Adds a where clause that retrieves only a subset of the table data if order by is used
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* @remarks Only works with tables that have columns named "list_order" or "update_order"
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*
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* EXAMPLE: SELECT * FROM xe_documents WHERE module_srl = 10 AND list_order < 2100000000 ORDER BY list_order
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*
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**/
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function limitResultIfOrderByIsUsed($order_list, $condition){
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if(!$order_list) return $condition;
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foreach ($order_list as $key => $val) {
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$col = $val[0];
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if(!in_array($col, array('list_order','update_order'))) continue;
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if($condition) $condition .= sprintf(' and %s < 2100000000 ', $col);
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else $condition = sprintf(' where %s < 2100000000 ', $col);
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}
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return $condition;
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}
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/**
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* @brief displays the current stack trace. Fetch the result
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**/
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@ -1138,68 +1162,16 @@
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if ($page > $total_page) $page = $total_page;
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$start_count = ($page - 1) * $list_count;
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if ($output->order) {
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$conditions = $this->getConditionList($output);
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//if(in_array('list_order', $conditions) || in_array('update_order', $conditions)) {
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foreach ($output->order as $key => $val) {
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$col = $val[0];
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if(!in_array($col, array('list_order','update_order'))) continue;
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if($condition) $condition .= sprintf(' and %s < 2100000000 ', $col);
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else $condition = sprintf(' where %s < 2100000000 ', $col);
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}
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//}
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}
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$condition = $this->limitResultIfOrderByIsUsed($output->order, $condition);
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// group by
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$groupby_query = $this->getGroupByClause($output->groups);
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if (count ($output->groups)) {
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foreach ($output->groups as $key => $value) {
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if (strpos ($value, '.')) {
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$tmp = explode ('.', $value);
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$tmp[0] = sprintf ('"%s"', $tmp[0]);
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$tmp[1] = sprintf ('"%s"', $tmp[1]);
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$value = implode ('.', $tmp);
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}
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elseif (strpos ($value, '(')) $value = $value;
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else $value = sprintf ('"%s"', $value);
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$output->groups[$key] = $value;
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}
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$groupby_query = sprintf (' group by %s', implode (',', $output->groups));
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}
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if ($output->order) {
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foreach ($output->order as $val) {
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if (strpos ($val[0], '.')) {
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$tmpval = explode ('.', $val[0]);
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$tmpval[0] = sprintf ('"%s"', $tmpval[0]);
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$tmpval[1] = sprintf ('"%s"', $tmpval[1]);
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$val[0] = implode ('.', $tmpval);
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}
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elseif (strpos ($val[0], '(')) $val[0] = $val[0];
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elseif ($val[0] == 'count') $val[0] = 'count (*)';
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else $val[0] = sprintf ('"%s"', $val[0]);
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$index_list[] = sprintf ('%s %s', $val[0], $val[1]);
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}
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if (count ($index_list)) {
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$orderby_query = ' order by '.implode(',', $index_list);
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}
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$orderby_query = sprintf ('%s for orderby_num() between %d and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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else {
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if (count($output->groups)) {
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$orderby_query = sprintf ('%s having groupby_num() between %d and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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else {
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if ($condition) {
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$orderby_query = sprintf ('%s and inst_num() between %d and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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else {
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$orderby_query = sprintf('%s where inst_num() between %d and %d', $orderby_query, $start_count + 1, $list_count + $start_count);
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}
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}
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}
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// order by
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$orderby_query = $this->getOrderByClause($output->order);
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// limit
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$limit_query = $this->getLimitClause($start_count, $list_count);
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if(count($output->arg_columns))
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{
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@ -1212,7 +1184,7 @@
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$columns = join(',',$columns);
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}
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$query = sprintf ("select %s from %s %s %s %s", $columns, implode (',',$table_list), implode (' ',$left_join), $condition, $groupby_query.$orderby_query);
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$query = sprintf ("select %s from %s %s %s %s", $columns, implode (',',$table_list), implode (' ',$left_join), $condition, $groupby_query.$orderby_query.$limit_query);
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$query .= (__DEBUG_QUERY__&1 && $output->query_id)?sprintf (' '.$this->comment_syntax, $this->query_id):'';
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$result = $this->_query ($query);
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