gian/phpmyadmin
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Form function to get FROM clause

Browse Source
This commit is contained in:
Atul Pratap Singh 2012-07-15 16:26:34 +05:30
parent 1623e5581d
commit fd2e73e989
2 changed files with 73 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
db_qbe.php
View File

@ -242,82 +242,12 @@ echo PMA_dbQbeGetTablesList($tbl_names);
// 1. SELECT
echo PMA_dbQbeGetSelectClause($criteria_column_count);
// 2. FROM
// Create LEFT JOINS out of Relations
// If we can use Relations we could make some left joins.
// First find out if relations are available in this database.
// First we need the really needed Tables - those in TableList might still be
// all Tables.
if (isset($criteriaColumn) && count($criteriaColumn) > 0) {
// Initialize some variables
$all_tables = array();
$all_columns = array();
$tab_know = array();
$left_tables = array();
$left_join = '';
// We only start this if we have fields, otherwise it would be dumb
foreach ($criteriaColumn as $value) {
$parts = explode('.', $value);
if (! empty($parts[0]) && ! empty($parts[1])) {
$table = str_replace('`', '', $parts[0]);
$all_tables[$table] = $table;
$all_columns[] = $table . '.' . str_replace('`', '', $parts[1]);
}
} // end while
// Check 'where' clauses
if ($cfgRelation['relwork'] && count($all_tables) > 0) {
// Get tables and columns with valid where clauses
$valid_where_clauses = getWhereClauseTablesAndColumns(
$criteriaColumn, $criteria
);
$where_clause_tables = $valid_where_clauses['where_clause_tables'];
$where_clause_columns = $valid_where_clauses['where_clause_columns'];
// Get master table
$master = PMA_dbQbeGetMasterTable(
$db, $all_tables, $all_columns, $where_clause_columns, $where_clause_tables
);
$left_tables = $all_tables;
unset($left_tables[$master]);
$tab_know[$master] = $master;
$run = 0;
$emerg = '';
while (count($left_tables) > 0) {
if ($run % 2 == 0) {
$left_join .= PMA_getRelatives('master', $left_tables, $tab_know);
} else {
$left_join .= PMA_getRelatives('foreign', $left_tables, $tab_know);
}
$run++;
if ($run > 5) {
foreach ($left_tables as $table) {
$emerg .= ', ' . $common_functions->backquote($table);
unset($left_tables[$table]);
}
}
} // end while
$qry_from = $common_functions->backquote($master) . $emerg . $left_join;
} // end if ($cfgRelation['relwork'] && count($all_tables) > 0)
} // end count($criteriaColumn) > 0
// In case relations are not defined, just generate the FROM clause
// from the list of tables, however we don't generate any JOIN
if (empty($qry_from) && isset($all_tables)) {
$qry_from = implode(', ', $all_tables);
$from_clause = PMA_dbQbeGetFromClause($criteriaColumn, $criteria, $cfgRelation);
if (! empty($from_clause)) {
echo 'FROM ' . htmlspecialchars($from_clause) . "\n";
}
// Now let's see what we got
if (! empty($qry_from)) {
echo 'FROM ' . htmlspecialchars($qry_from) . "\n";
}
// 3. WHERE
echo PMA_dbQbeGetWhereClause($criteria_column_count, $criteria_row_count);
// 4. ORDER BY
echo PMA_dbQbeGetOrderByClause($criteria_column_count);
?>

70
libraries/db_qbe.lib.php
View File

@ -887,4 +887,74 @@ function getWhereClauseTablesAndColumns($criteriaColumn, $criteria) {
'where_clause_columns' => $where_clause_columns
);
}
/**
* Provides FROM clause for building SQL query
*
* @param string $criteriaColumn Selected table.columns
* @param string $criteria Already Filled criteria
*
* @return FROM clause
*/
function PMA_dbQbeGetFromClause($criteriaColumn, $criteria, $cfgRelation)
{
$from_clause = '';
if (isset($criteriaColumn) && count($criteriaColumn) > 0) {
// Initialize some variables
$all_tables = $all_columns = $tab_know = $left_tables = array();
$left_join = '';
// We only start this if we have fields, otherwise it would be dumb
foreach ($criteriaColumn as $value) {
$parts = explode('.', $value);
if (! empty($parts[0]) && ! empty($parts[1])) {
$table = str_replace('`', '', $parts[0]);
$all_tables[$table] = $table;
$all_columns[] = $table . '.' . str_replace('`', '', $parts[1]);
}
} // end while
// Create LEFT JOINS out of Relations
if ($cfgRelation['relwork'] && count($all_tables) > 0) {
// Get tables and columns with valid where clauses
$valid_where_clauses = getWhereClauseTablesAndColumns(
$criteriaColumn, $criteria
);
$where_clause_tables = $valid_where_clauses['where_clause_tables'];
$where_clause_columns = $valid_where_clauses['where_clause_columns'];
// Get master table
$master = PMA_dbQbeGetMasterTable(
$db, $all_tables, $all_columns, $where_clause_columns, $where_clause_tables
);
$left_tables = $all_tables;
unset($left_tables[$master]);
$tab_know[$master] = $master;
$run = 0;
$emerg = '';
while (count($left_tables) > 0) {
if ($run % 2 == 0) {
$left_join .= PMA_getRelatives('master', $left_tables, $tab_know);
} else {
$left_join .= PMA_getRelatives('foreign', $left_tables, $tab_know);
}
$run++;
if ($run > 5) {
foreach ($left_tables as $table) {
$emerg .= ', ' . $common_functions->backquote($table);
unset($left_tables[$table]);
}
}
} // end while
$from_clause = $common_functions->backquote($master) . $emerg . $left_join;
} // end if ($cfgRelation['relwork'] && count($all_tables) > 0)
} // end count($criteriaColumn) > 0
// In case relations are not defined, just generate the FROM clause
// from the list of tables, however we don't generate any JOIN
if (empty($from_clause) && isset($all_tables)) {
$from_clause = implode(', ', $all_tables);
}
return $from_clause;
}
?>