protected function findConstraints($table)
    {
        $sql = <<<'SQL'
SELECT
    /*+ PUSH_PRED(C) PUSH_PRED(D) PUSH_PRED(E) */
    D.CONSTRAINT_NAME,
    D.CONSTRAINT_TYPE,
    C.COLUMN_NAME,
    C.POSITION,
    D.R_CONSTRAINT_NAME,
    E.TABLE_NAME AS TABLE_REF,
    F.COLUMN_NAME AS COLUMN_REF,
    C.TABLE_NAME
FROM ALL_CONS_COLUMNS C
    INNER JOIN ALL_CONSTRAINTS D ON D.OWNER = C.OWNER AND D.CONSTRAINT_NAME = C.CONSTRAINT_NAME
    LEFT JOIN ALL_CONSTRAINTS E ON E.OWNER = D.R_OWNER AND E.CONSTRAINT_NAME = D.R_CONSTRAINT_NAME
    LEFT JOIN ALL_CONS_COLUMNS F ON F.OWNER = E.OWNER AND F.CONSTRAINT_NAME = E.CONSTRAINT_NAME AND F.POSITION = C.POSITION
WHERE
    C.OWNER = :schemaName
    AND C.TABLE_NAME = :tableName
ORDER BY D.CONSTRAINT_NAME, C.POSITION
SQL;
        $command = $this->db->createCommand($sql, [
            ':tableName' => $table->name,
            ':schemaName' => $table->schemaName,
        ]);
        $constraints = [];
        foreach ($command->queryAll() as $row) {
            if ($this->db->slavePdo->getAttribute(\PDO::ATTR_CASE) === \PDO::CASE_LOWER) {
                $row = array_change_key_case($row, CASE_UPPER);
            }

            if ($row['CONSTRAINT_TYPE'] === 'P') {
                $table->columns[$row['COLUMN_NAME']]->isPrimaryKey = true;
                $table->primaryKey[] = $row['COLUMN_NAME'];
                if (empty($table->sequenceName)) {
                    $table->sequenceName = $this->getTableSequenceName($table->name);
                }
            }

            if ($row['CONSTRAINT_TYPE'] !== 'R') {
                // this condition is not checked in SQL WHERE because of an Oracle Bug:
                // see https://github.com/yiisoft/yii2/pull/8844
                continue;
            }

            $name = $row['CONSTRAINT_NAME'];
            if (!isset($constraints[$name])) {
                $constraints[$name] = [
                    'tableName' => $row['TABLE_REF'],
                    'columns' => [],
                ];
            }
            $constraints[$name]['columns'][$row['COLUMN_NAME']] = $row['COLUMN_REF'];
        }

        foreach ($constraints as $constraint) {
            $name = current(array_keys($constraint));

            $table->foreignKeys[$name] = array_merge([$constraint['tableName']], $constraint['columns']);
        }
    }
protected function findConstraints($table)
    {
        $sql = <<<'SQL'
SELECT
    
    D.CONSTRAINT_NAME,
    D.CONSTRAINT_TYPE,
    C.COLUMN_NAME,
    C.POSITION,
    D.R_CONSTRAINT_NAME,
    E.TABLE_NAME AS TABLE_REF,
    F.COLUMN_NAME AS COLUMN_REF,
    C.TABLE_NAME
FROM ALL_CONS_COLUMNS C
    INNER JOIN ALL_CONSTRAINTS D ON D.OWNER = C.OWNER AND D.CONSTRAINT_NAME = C.CONSTRAINT_NAME
    LEFT JOIN ALL_CONSTRAINTS E ON E.OWNER = D.R_OWNER AND E.CONSTRAINT_NAME = D.R_CONSTRAINT_NAME
    LEFT JOIN ALL_CONS_COLUMNS F ON F.OWNER = E.OWNER AND F.CONSTRAINT_NAME = E.CONSTRAINT_NAME AND F.POSITION = C.POSITION
WHERE
    C.OWNER = :schemaName
    AND C.TABLE_NAME = :tableName
ORDER BY D.CONSTRAINT_NAME, C.POSITION
SQL;
        $command = $this->db->createCommand($sql, [
            ':tableName' => $table->name,
            ':schemaName' => $table->schemaName,
        ]);
        $constraints = [];
        foreach ($command->queryAll() as $row) {
            if ($this->db->slavePdo->getAttribute(\PDO::ATTR_CASE) === \PDO::CASE_LOWER) {
                $row = array_change_key_case($row, CASE_UPPER);
            }

            if ($row['CONSTRAINT_TYPE'] === 'P') {
                $table->columns[$row['COLUMN_NAME']]->isPrimaryKey = true;
                $table->primaryKey[] = $row['COLUMN_NAME'];
                if (empty($table->sequenceName)) {
                    $table->sequenceName = $this->getTableSequenceName($table->name);
                }
            }

            if ($row['CONSTRAINT_TYPE'] !== 'R') {
                
                
                continue;
            }

            $name = $row['CONSTRAINT_NAME'];
            if (!isset($constraints[$name])) {
                $constraints[$name] = [
                    'tableName' => $row['TABLE_REF'],
                    'columns' => [],
                ];
            }
            $constraints[$name]['columns'][$row['COLUMN_NAME']] = $row['COLUMN_REF'];
        }

        foreach ($constraints as $constraint) {
            $name = current(array_keys($constraint));

            $table->foreignKeys[$name] = array_merge([$constraint['tableName']], $constraint['columns']);
        }
    }
protected function findConstraints ( $ table ) { $ sql =  <<<'SQL'
SELECT
    /*+ PUSH_PRED(C) PUSH_PRED(D) PUSH_PRED(E) */
    D.CONSTRAINT_NAME,
    D.CONSTRAINT_TYPE,
    C.COLUMN_NAME,
    C.POSITION,
    D.R_CONSTRAINT_NAME,
    E.TABLE_NAME AS TABLE_REF,
    F.COLUMN_NAME AS COLUMN_REF,
    C.TABLE_NAME
FROM ALL_CONS_COLUMNS C
    INNER JOIN ALL_CONSTRAINTS D ON D.OWNER = C.OWNER AND D.CONSTRAINT_NAME = C.CONSTRAINT_NAME
    LEFT JOIN ALL_CONSTRAINTS E ON E.OWNER = D.R_OWNER AND E.CONSTRAINT_NAME = D.R_CONSTRAINT_NAME
    LEFT JOIN ALL_CONS_COLUMNS F ON F.OWNER = E.OWNER AND F.CONSTRAINT_NAME = E.CONSTRAINT_NAME AND F.POSITION = C.POSITION
WHERE
    C.OWNER = :schemaName
    AND C.TABLE_NAME = :tableName
ORDER BY D.CONSTRAINT_NAME, C.POSITION
SQL ; $ command = $ this -> db -> createCommand ( $ sql , [ ':tableName' => $ table -> name , ':schemaName' => $ table -> schemaName , ] ) ; $ constraints = [ ] ; foreach ( $ command -> queryAll ( ) as $ row ) { if ( $ this -> db -> slavePdo -> getAttribute ( \ PDO :: ATTR_CASE ) === \ PDO :: CASE_LOWER ) { $ row = array_change_key_case ( $ row , CASE_UPPER ) ; } if ( $ row [ 'CONSTRAINT_TYPE' ] === 'P' ) { $ table -> columns [ $ row [ 'COLUMN_NAME' ] ] -> isPrimaryKey = true ; $ table -> primaryKey [ ] = $ row [ 'COLUMN_NAME' ] ; if ( empty ( $ table -> sequenceName ) ) { $ table -> sequenceName = $ this -> getTableSequenceName ( $ table -> name ) ; } } if ( $ row [ 'CONSTRAINT_TYPE' ] !== 'R' ) { // this condition is not checked in SQL WHERE because of an Oracle Bug: // see https://github.com/yiisoft/yii2/pull/8844 continue ; } $ name = $ row [ 'CONSTRAINT_NAME' ] ; if ( ! isset ( $ constraints [ $ name ] ) ) { $ constraints [ $ name ] = [ 'tableName' => $ row [ 'TABLE_REF' ] , 'columns' => [ ] , ] ; } $ constraints [ $ name ] [ 'columns' ] [ $ row [ 'COLUMN_NAME' ] ] = $ row [ 'COLUMN_REF' ] ; } foreach ( $ constraints as $ constraint ) { $ name = current ( array_keys ( $ constraint ) ) ; $ table -> foreignKeys [ $ name ] = array_merge ( [ $ constraint [ 'tableName' ] ] , $ constraint [ 'columns' ] ) ; } }
Finds constraints and fills them into TableSchema object passed.
@param TableSchema $table
Finds constraints and fills them into TableSchema object passed .