override only mssql and sqlite QueryBuilder; throw an exception for composite in condition with a subquery

fixes #yiisoft/yii#3712

ensure PDO instance has been created at this point

close #6779

Fixes #6398: Added support for specifying dependent component in terms of a configuration array for classes such as `DbCache`

- yii\db\BaseActiveRecord::findByCondition better exception
- yii\db\ActiveRecord::findByCondition better exception

close #6704

A back quote sign in docblock missed.

The exceptions thrown on error are db exceptions.

Fixes #6271: Query caching returns the same data when running the same SQL with different fetch modes

fixes #6164

issue #6126

return value would not be a valid array when json encoded after unlink().

fixes #6065

Fixes #6049: `yii\db\Connection::getSchema()` for Oracle should return false when the table does not exist. Oracle does not support `ON UPDATE` clause.

Fix batchInsert bug in oci. default batchInsert sql is ``` insert into tableName(col1, col2, col3...) value(`col11`, `col12`,`col13`.... ),(`col21`, `col22`,`col23`.... ); ``` which is illegal in oracle db. Change it to ``` insert into tableName(col1, col2, col3...) select 'col11', 'col12', 'col13' from dual union select 'col21', 'col22', 'col23' from dual union select 'col31', 'col32', 'col33' from dual; ```

oracle db doesn't support `ON UPDATE` in FOREIGN KEY. remove `ON UPDATE` section in method `addForeignKey`.

fix oci bugs: \yii\db\oci\Schema::findColumns($table) return true when table doesn't exist When table doesn't exist, query in method `findColumns` return empty array instead of throw a exception.

Fixes #5735: Added `yii\bootstrap\Tabs::renderTabContent` to support manually rendering tab contents

fixes #5601