/**
* Remaps table/field names in a SELECT query's parts
*
* @param mixed $select_fields Either parsed list of tables (SQLparser->parseFromTables()) or list of fields to select from the table. This is what comes right after "SELECT ...". Required value.
* @param string $from_table Table(s) from which to select. This is what comes right after "FROM ...". Require value.
* @param string $where_clause Where clause. This is what comes right after "WHERE ...". Can be blank.
* @param string $groupBy Group by field(s)
* @param string $orderBy Order by field(s)
* @return array
* @see exec_SELECTquery()
*/
protected function map_remapSELECTQueryParts($select_fields, $from_table, $where_clause, $groupBy, $orderBy)
{
// Backup current mapping as it may be altered if aliases on mapped tables are found
$backupMapping = $this->mapping;
// Tables:
$tables = is_array($from_table) ? $from_table : $this->SQLparser->parseFromTables($from_table);
$defaultTable = $tables[0]['table'];
// Prepare mapping for aliased tables. This will copy the definition of the original table name.
// The alias is prefixed with a database-incompatible character to prevent naming clash with real table name
// Further access to $this->mapping should be made through $this->getMappingKey() method
foreach ($tables as $k => $v) {
if ($v['as'] && is_array($this->mapping[$v['table']]['mapFieldNames'])) {
$mappingKey = $this->getFreeMappingKey($v['as']);
$this->mapping[$mappingKey]['mapFieldNames'] =& $this->mapping[$v['table']]['mapFieldNames'];
}
if (is_array($v['JOIN'])) {
foreach ($v['JOIN'] as $joinCnt => $join) {
if ($join['as'] && is_array($this->mapping[$join['withTable']]['mapFieldNames'])) {
$mappingKey = $this->getFreeMappingKey($join['as']);
$this->mapping[$mappingKey]['mapFieldNames'] =& $this->mapping[$join['withTable']]['mapFieldNames'];
}
}
}
}
foreach ($tables as $k => $v) {
$tableKey = $this->getMappingKey($v['table']);
if ($this->mapping[$tableKey]['mapTableName']) {
$tables[$k]['table'] = $this->mapping[$tableKey]['mapTableName'];
}
// Mapping JOINS
if (is_array($v['JOIN'])) {
foreach ($v['JOIN'] as $joinCnt => $join) {
// Mapping withTable of the JOIN
$withTableKey = $this->getMappingKey($join['withTable']);
if ($this->mapping[$withTableKey]['mapTableName']) {
$tables[$k]['JOIN'][$joinCnt]['withTable'] = $this->mapping[$withTableKey]['mapTableName'];
}
$onPartsArray = array();
// Mapping ON parts of the JOIN
if (is_array($tables[$k]['JOIN'][$joinCnt]['ON'])) {
foreach ($tables[$k]['JOIN'][$joinCnt]['ON'] as &$condition) {
// Left side of the comparator
$leftTableKey = $this->getMappingKey($condition['left']['table']);
if (isset($this->mapping[$leftTableKey]['mapFieldNames'][$condition['left']['field']])) {
$condition['left']['field'] = $this->mapping[$leftTableKey]['mapFieldNames'][$condition['left']['field']];
}
if (isset($this->mapping[$leftTableKey]['mapTableName'])) {
$condition['left']['table'] = $this->mapping[$leftTableKey]['mapTableName'];
}
// Right side of the comparator
$rightTableKey = $this->getMappingKey($condition['right']['table']);
if (isset($this->mapping[$rightTableKey]['mapFieldNames'][$condition['right']['field']])) {
$condition['right']['field'] = $this->mapping[$rightTableKey]['mapFieldNames'][$condition['right']['field']];
}
if (isset($this->mapping[$rightTableKey]['mapTableName'])) {
$condition['right']['table'] = $this->mapping[$rightTableKey]['mapTableName'];
}
}
}
}
}
}
$fromParts = $tables;
// Where clause:
$parameterReferences = array();
$whereParts = $this->SQLparser->parseWhereClause($where_clause, '', $parameterReferences);
$this->map_sqlParts($whereParts, $defaultTable);
// Select fields:
$selectParts = $this->SQLparser->parseFieldList($select_fields);
$this->map_sqlParts($selectParts, $defaultTable);
// Group By fields
$groupByParts = $this->SQLparser->parseFieldList($groupBy);
$this->map_sqlParts($groupByParts, $defaultTable);
// Order By fields
$orderByParts = $this->SQLparser->parseFieldList($orderBy);
$this->map_sqlParts($orderByParts, $defaultTable);
// Restore the original mapping
$this->mapping = $backupMapping;
return array($selectParts, $fromParts, $whereParts, $groupByParts, $orderByParts, $parameterReferences);
}
