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If the same query is executed again, the result may be fetched from cache directly without actually executing the SQL statement. This can be either a string representing a SQL statement, or an array representing different fragments of a SQL statement.

Please refer to CDb Command::__construct for more details about how to pass an array as the query.

If this parameter is not given, you will have to call query builder methods of CDb Command to build the DB query. The results returned include the number of SQL statements executed and the total time spent.

In order to use this method, enable Profiling has to be set true. This method is required by IApplication Component and is invoked by application when the CDb Connection is used as an application component.

Defaults to 'cache' which refers to the primary cache application component.

Set this property to false if you want to disable query caching.

The default value is null, which will not change the ATTR_EMULATE_PREPARES value of PDO.

If greater than 0 and the primary cache is enabled, the table metadata will be cached. The results returned include the number of SQL statements executed and the total time spent. By setting this property, any token like '' in CDb Command::text will be replaced by 'prefix Table Name', where 'prefix' refers to this property value. This method can be used to enable or disable query caching.The best approach here would be a joint project of the company and a company specializing in this area.The global experience shows that a data warehouse is to be created for a specific customer.the number of SQL statements that need to be cached next.If this is 0, then even if query caching is enabled, no query will be cached.This might be useful when working with ODBC connections.Sample code: whether the database connection should be automatically established the component is being initialized. Note, this property is only effective when the CDb Connection object is used as an application component. The property is only used for My SQL, Maria DB and Postgre SQL databases.You should be aware that logging parameter values could be expensive and have significant impact on the performance of your application.the ID of the cache application component that is used for query caching.The method cache() is provided as a convenient way of setting this property and query Caching Dependency on the fly.the ID of the cache application component that is used to cache the table metadata.

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