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Form functions to get LEFT JOIN column candidates

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This commit is contained in:
Atul Pratap Singh 2012-07-14 19:56:29 +05:30
parent dc1728f99a
commit de318fce3b
2 changed files with 110 additions and 60 deletions
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63
db_qbe.php
View File

@ -310,66 +310,9 @@ if (isset($criteriaColumn) && count($criteriaColumn) > 0) {
// (When the control user is the same as the normal user
// because he is using one of his databases as pmadb,
// the last db selected is not always the one where we need to work)
PMA_DBI_select_db($db);
foreach ($tab_all as $tab) {
$indexes = PMA_DBI_get_table_indexes($db, $tab);
foreach ($indexes as $ind) {
$col1 = $tab . '.' . $ind['Column_name'];
if (isset($col_all[$col1])) {
if ($ind['Non_unique'] == 0) {
if (isset($col_where[$col1])) {
$col_unique[$col1] = 'Y';
} else {
$col_unique[$col1] = 'N';
}
} else {
if (isset($col_where[$col1])) {
$col_index[$col1] = 'Y';
} else {
$col_index[$col1] = 'N';
}
}
}
} // end while (each col of tab)
} // end while (each tab)
// now we want to find the best.
if (isset($col_unique) && count($col_unique) > 0) {
$col_cand = $col_unique;
$needsort = 1;
} elseif (isset($col_index) && count($col_index) > 0) {
$col_cand = $col_index;
$needsort = 1;
} elseif (isset($col_where) && count($col_where) > 0) {
$col_cand = $tab_wher;
$needsort = 0;
} else {
$col_cand = $tab_all;
$needsort = 0;
}
// If we came up with $col_unique (very good) or $col_index (still
// good) as $col_cand we want to check if we have any 'Y' there
// (that would mean that they were also found in the whereclauses
// which would be great). if yes, we take only those
if ($needsort == 1) {
foreach ($col_cand as $col1 => $is_where) {
$tab = explode('.', $col1);
$tab = $tab[0];
if ($is_where == 'Y') {
$vg[$col1] = $tab;
} else {
$sg[$col1] = $tab;
}
}
if (isset($vg)) {
$col_cand = $vg;
// Candidates restricted in index+where
} else {
$col_cand = $sg;
// None of the candidates where in a where-clause
}
}
$col_cand = PMA_dbQbeGetLeftJoinColumnCandidates(
$db, $tab_all, $col_all, $col_where
);
// If our array of candidates has more than one member we'll just
// find the smallest table.

107
libraries/db_qbe.lib.php
View File

@ -690,4 +690,111 @@ function PMA_dbQbeGetOrderByClause($criteria_column_count)
}
return $orderby_clause;
}
/**
* Provides UNIQUE columns and INDEX columns present in criteria tables
*
* @param array $db Selected database
* @param array $all_tables Tables involved in the search
* @param array $all_columns Columns involved in the search
* @param array $where_clause_columns Columns having criteria where clause
*
* @return array having UNIQUE and INDEX columns
*/
function PMA_dbQbeGetIndexes($db, $all_tables, $all_columns, $where_clause_columns
) {
$unique_columns = array();
$index_columns = array();
foreach ($all_tables as $table) {
$indexes = PMA_DBI_get_table_indexes($db, $table);
foreach ($indexes as $index) {
$column = $table . '.' . $index['Column_name'];
if (isset($all_columns[$column])) {
if ($index['Non_unique'] == 0) {
if (isset($where_clause_columns[$column])) {
$unique_columns[$column] = 'Y';
} else {
$unique_columns[$column] = 'N';
}
} else {
if (isset($where_clause_columns[$column])) {
$index_columns[$column] = 'Y';
} else {
$index_columns[$column] = 'N';
}
}
}
} // end while (each index of a table)
} // end while (each table)
return array(
'unique' => $unique_columns,
'index' => $index_columns
);
}
/**
* Provides UNIQUE columns and INDEX columns present in criteria tables
*
* @param array $db Selected database
* @param array $all_tables Tables involved in the search
* @param array $all_columns Columns involved in the search
* @param array $where_clause_columns Columns having criteria where clause
*
* @return array having UNIQUE and INDEX columns
*/
function PMA_dbQbeGetLeftJoinColumnCandidates($db, $all_tables, $all_columns,
$where_clause_columns
) {
PMA_DBI_select_db($db);
$candidate_columns = array();
// Get unique columns and index columns
$indexes = PMA_dbQbeGetIndexes(
$db, $all_tables, $all_columns, $where_clause_columns
);
$unique_columns = $indexes['unique'];
$index_columns = $indexes['index'];
// now we want to find the best.
if (isset($unique_columns) && count($unique_columns) > 0) {
$candidate_columns = $unique_columns;
$needsort = 1;
} elseif (isset($index_columns) && count($index_columns) > 0) {
$candidate_columns = $index_columns;
$needsort = 1;
} elseif (isset($where_clause_columns) && count($where_clause_columns) > 0) {
$candidate_columns = $tab_wher;
$needsort = 0;
} else {
$candidate_columns = $all_tables;
$needsort = 0;
}
// If we came up with $unique_columns (very good) or $index_columns (still
// good) as $candidate_columns we want to check if we have any 'Y' there
// (that would mean that they were also found in the whereclauses
// which would be great). if yes, we take only those
if ($needsort == 1) {
foreach ($candidate_columns as $column => $is_where) {
$table = explode('.', $column);
$table = $table[0];
if ($is_where == 'Y') {
$vg[$column] = $table;
} else {
$sg[$column] = $table;
}
}
if (isset($vg)) {
$candidate_columns = $vg;
// Candidates restricted in index+where
} else {
$candidate_columns = $sg;
// None of the candidates where in a where-clause
}
}
return $candidate_columns;
}
?>