/**
* Gets the SQL snippet for all join columns of the given class that are to be
* placed in an SQL SELECT statement.
*
* @return string
*/
protected function _getSelectJoinColumnsSQL(ClassMetadata $class)
{
$sql = '';
foreach ($class->associationMappings as $assoc) {
if ($assoc->isOwningSide && $assoc->isOneToOne()) {
foreach ($assoc->targetToSourceKeyColumns as $srcColumn) {
$columnAlias = $srcColumn . $this->_sqlAliasCounter++;
$sql .= ', ' . $this->_getSQLTableAlias($this->_class) . ".{$srcColumn} AS {$columnAlias}";
$resultColumnName = $this->_platform->getSQLResultCasing($columnAlias);
if (!isset($this->_resultColumnNames[$resultColumnName])) {
$this->_resultColumnNames[$resultColumnName] = $srcColumn;
}
}
}
}
return $sql;
}
/**
* Walks down a SelectExpression AST node and generates the corresponding SQL.
*
* @param SelectExpression $selectExpression
* @return string The SQL.
*/
public function walkSelectExpression($selectExpression)
{
$sql = '';
$expr = $selectExpression->expression;
if ($expr instanceof AST\PathExpression) {
if ($expr->type == AST\PathExpression::TYPE_STATE_FIELD) {
$parts = $expr->parts;
$fieldName = array_pop($parts);
$dqlAlias = $expr->identificationVariable . (!empty($parts) ? '.' . implode('.', $parts) : '');
$qComp = $this->_queryComponents[$dqlAlias];
$class = $qComp['metadata'];
if (!$selectExpression->fieldIdentificationVariable) {
$resultAlias = $fieldName;
} else {
$resultAlias = $selectExpression->fieldIdentificationVariable;
}
if ($class->isInheritanceTypeJoined()) {
$tableName = $this->_em->getUnitOfWork()->getEntityPersister($class->name)->getOwningTable($fieldName);
} else {
$tableName = $class->getTableName();
}
$sqlTableAlias = $this->getSqlTableAlias($tableName, $dqlAlias);
$columnName = $class->getQuotedColumnName($fieldName, $this->_platform);
$columnAlias = $this->getSqlColumnAlias($columnName);
$sql .= $sqlTableAlias . '.' . $columnName . ' AS ' . $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addScalarResult($columnAlias, $resultAlias);
} else {
throw QueryException::invalidPathExpression($expr->type);
}
} else {
if ($expr instanceof AST\AggregateExpression) {
if (!$selectExpression->fieldIdentificationVariable) {
$resultAlias = $this->_scalarResultCounter++;
} else {
$resultAlias = $selectExpression->fieldIdentificationVariable;
}
$columnAlias = 'sclr' . $this->_aliasCounter++;
$sql .= $this->walkAggregateExpression($expr) . ' AS ' . $columnAlias;
$this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addScalarResult($columnAlias, $resultAlias);
} else {
if ($expr instanceof AST\Subselect) {
if (!$selectExpression->fieldIdentificationVariable) {
$resultAlias = $this->_scalarResultCounter++;
} else {
$resultAlias = $selectExpression->fieldIdentificationVariable;
}
$columnAlias = 'sclr' . $this->_aliasCounter++;
$sql .= '(' . $this->walkSubselect($expr) . ') AS ' . $columnAlias;
$this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addScalarResult($columnAlias, $resultAlias);
} else {
if ($expr instanceof AST\Functions\FunctionNode) {
if (!$selectExpression->fieldIdentificationVariable) {
$resultAlias = $this->_scalarResultCounter++;
} else {
$resultAlias = $selectExpression->fieldIdentificationVariable;
}
$columnAlias = 'sclr' . $this->_aliasCounter++;
$sql .= $this->walkFunction($expr) . ' AS ' . $columnAlias;
$this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addScalarResult($columnAlias, $resultAlias);
} else {
if ($expr instanceof AST\SimpleArithmeticExpression) {
if (!$selectExpression->fieldIdentificationVariable) {
$resultAlias = $this->_scalarResultCounter++;
} else {
$resultAlias = $selectExpression->fieldIdentificationVariable;
}
$columnAlias = 'sclr' . $this->_aliasCounter++;
$sql .= $this->walkSimpleArithmeticExpression($expr) . ' AS ' . $columnAlias;
$this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addScalarResult($columnAlias, $resultAlias);
} else {
// IdentificationVariable or PartialObjectExpression
if ($expr instanceof AST\PartialObjectExpression) {
$dqlAlias = $expr->identificationVariable;
$partialFieldSet = $expr->partialFieldSet;
} else {
$dqlAlias = $expr;
$partialFieldSet = array();
}
$queryComp = $this->_queryComponents[$dqlAlias];
$class = $queryComp['metadata'];
if (!isset($this->_selectedClasses[$dqlAlias])) {
$this->_selectedClasses[$dqlAlias] = $class;
}
$beginning = true;
// Select all fields from the queried class
foreach ($class->fieldMappings as $fieldName => $mapping) {
if ($partialFieldSet && !in_array($fieldName, $partialFieldSet)) {
continue;
}
if (isset($mapping['inherited'])) {
$tableName = $this->_em->getClassMetadata($mapping['inherited'])->primaryTable['name'];
} else {
$tableName = $class->primaryTable['name'];
}
if ($beginning) {
$beginning = false;
} else {
$sql .= ', ';
}
$sqlTableAlias = $this->getSqlTableAlias($tableName, $dqlAlias);
$columnAlias = $this->getSqlColumnAlias($mapping['columnName']);
$sql .= $sqlTableAlias . '.' . $class->getQuotedColumnName($fieldName, $this->_platform) . ' AS ' . $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addFieldResult($dqlAlias, $columnAlias, $fieldName, $class->name);
}
// Add any additional fields of subclasses (excluding inherited fields)
// 1) on Single Table Inheritance: always, since its marginal overhead
// 2) on Class Table Inheritance only if partial objects are disallowed,
// since it requires outer joining subtables.
if ($class->isInheritanceTypeSingleTable() || !$this->_query->getHint(Query::HINT_FORCE_PARTIAL_LOAD)) {
foreach ($class->subClasses as $subClassName) {
$subClass = $this->_em->getClassMetadata($subClassName);
$sqlTableAlias = $this->getSqlTableAlias($subClass->primaryTable['name'], $dqlAlias);
foreach ($subClass->fieldMappings as $fieldName => $mapping) {
if (isset($mapping['inherited']) || $partialFieldSet && !in_array($fieldName, $partialFieldSet)) {
continue;
}
if ($beginning) {
$beginning = false;
} else {
$sql .= ', ';
}
$columnAlias = $this->getSqlColumnAlias($mapping['columnName']);
$sql .= $sqlTableAlias . '.' . $subClass->getQuotedColumnName($fieldName, $this->_platform) . ' AS ' . $columnAlias;
$columnAlias = $this->_platform->getSQLResultCasing($columnAlias);
$this->_rsm->addFieldResult($dqlAlias, $columnAlias, $fieldName, $subClassName);
}
// Add join columns (foreign keys) of the subclass
//TODO: Probably better do this in walkSelectClause to honor the INCLUDE_META_COLUMNS hint
foreach ($subClass->associationMappings as $fieldName => $assoc) {
if ($assoc->isOwningSide && $assoc->isOneToOne() && !isset($subClass->inheritedAssociationFields[$fieldName])) {
foreach ($assoc->targetToSourceKeyColumns as $srcColumn) {
if ($beginning) {
$beginning = false;
} else {
$sql .= ', ';
}
$columnAlias = $this->getSqlColumnAlias($srcColumn);
$sql .= $sqlTableAlias . '.' . $srcColumn . ' AS ' . $columnAlias;
$this->_rsm->addMetaResult($dqlAlias, $this->_platform->getSQLResultCasing($columnAlias), $srcColumn);
}
}
}
}
}
}
}
}
}
}
return $sql;
}
/**
* Gets an SQL column alias for a column name.
*
* @param string $columnName
* @return string
*/
public function getSQLColumnAlias($columnName)
{
// Trim the column alias to the maximum identifier length of the platform.
// If the alias is to long, characters are cut off from the beginning.
return $this->_platform->getSQLResultCasing(substr($columnName . $this->_aliasCounter++, -$this->_platform->getMaxIdentifierLength()));
}
