Use Tablestore SDK for PHP to query information about a table - Tablestore

You can execute the DESCRIBE statement to query the information about tables, such as the field names and field types.

Note

For more information about the DESCRIBE statement, see Query information about tables.

Prerequisites

An OTSClient instance is initialized. For more information, see Initialize an OTSClient instance.
A mapping table is created. For more information, see Create mapping tables.

Usage notes

Tablestore SDK for PHP V5.1.0 or later supports the SQL query feature. Before you use the SQL query feature, make sure that Tablestore SDK for PHP V5.1.0 or later is obtained. For information about the versions of Tablestore SDK for PHP, see Version history of Tablestore SDK for PHP.

Examples

The following sample code provides an example on how to execute the DESCRIBE `tableName`; statement to query information about a table named tableName:

$request = array(
    'query' => 'DESCRIBE `tableName`;',
);
$response = $otsClient->sqlQuery ($request);
$sqlRows = $response['sql_rows'];
print json_encode($sqlRows, JSON_PRETTY_PRINT);

References

To use a mapping table to query data that meets specific conditions, execute the SELECT statement. For more information, see Query data.
To update the attribute column of a mapping table after an attribute column of the data table is changed, execute the ALTER TABLE statement. For more information, see Update attribute columns of mapping tables.
To delete a mapping table, execute the DROP MAPPING TABLE statement. For more information, see Delete mapping tables.