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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\oci;
use yii\base\InvalidParamException;
/**
* QueryBuilder is the query builder for Oracle databases.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class QueryBuilder extends \yii\db\QueryBuilder
{
private $_sql;
/**
* @inheritdoc
*/
public function build($query, $params = [])
{
$query->prepareBuild($this);
$params = empty($params) ? $query->params : array_merge($params, $query->params);
$clauses = [
$this->buildSelect($query->select, $params, $query->distinct, $query->selectOption),
$this->buildFrom($query->from, $params),
$this->buildJoin($query->join, $params),
$this->buildWhere($query->where, $params),
$this->buildGroupBy($query->groupBy),
$this->buildHaving($query->having, $params),
$this->buildOrderBy($query->orderBy),
];
$this->_sql = implode($this->separator, array_filter($clauses));
$this->_sql = $this->buildLimit($query->limit, $query->offset);
$union = $this->buildUnion($query->union, $params);
if ($union !== '') {
$this->_sql = "{$this->_sql}{$this->separator}$union";
}
return [$this->_sql, $params];
}
public function buildLimit($limit, $offset)
{
$filters = [];
if ($this->hasOffset($offset) > 0) {
$filters[] = 'rowNumId > ' . $offset;
}
if ($this->hasLimit($limit)) {
$filters[] = 'rownum <= ' . $limit;
}
if (!empty($filters)) {
$filter = implode(' and ', $filters);
return <<<EOD
WITH USER_SQL AS ({$this->_sql}),
PAGINATION AS (SELECT USER_SQL.*, rownum as rowNumId FROM USER_SQL)
SELECT *
FROM PAGINATION
WHERE $filter
EOD;
} else {
return $this->_sql;
}
}
/**
* Builds a SQL statement for renaming a DB table.
*
* @param string $table the table to be renamed. The name will be properly quoted by the method.
* @param string $newName the new table name. The name will be properly quoted by the method.
* @return string the SQL statement for renaming a DB table.
*/
public function renameTable($table, $newName)
{
return 'ALTER TABLE ' . $this->db->quoteTableName($table) . ' RENAME TO ' . $this->db->quoteTableName($newName);
}
/**
* Builds a SQL statement for changing the definition of a column.
*
* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
* @param string $type the new column type. The [[getColumnType]] method will be invoked to convert abstract column type (if any)
* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
* @return string the SQL statement for changing the definition of a column.
*/
public function alterColumn($table, $column, $type)
{
$type = $this->getColumnType($type);
return 'ALTER TABLE ' . $this->db->quoteTableName($table) . ' MODIFY ' . $this->db->quoteColumnName($column) . ' ' . $this->getColumnType($type);
}
/**
* Builds a SQL statement for dropping an index.
*
* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
* @return string the SQL statement for dropping an index.
*/
public function dropIndex($name, $table)
{
return 'DROP INDEX ' . $this->db->quoteTableName($name);
}
/**
* @inheritdoc
*/
public function resetSequence($table, $value = null)
{
$tableSchema = $this->db->getTableSchema($table);
if ($tableSchema === null) {
throw new InvalidParamException("Unknown table: $table");
}
if ($tableSchema->sequenceName === null) {
return '';
}
if ($value !== null) {
$value = (int) $value;
} else {
$value = (int) $this->db->createCommand("SELECT MAX(\"{$tableSchema->primaryKey}\") FROM \"{$tableSchema->name}\"")->queryScalar();
$value++;
}
return "DROP SEQUENCE \"{$tableSchema->name}_SEQ\";"
. "CREATE SEQUENCE \"{$tableSchema->name}_SEQ\" START WITH {$value} INCREMENT BY 1 NOMAXVALUE NOCACHE";
}
}