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 the information about a table.
Prerequisites
- An OTSClient instance is initialized. For more information, see initialization.
- A mapping table is created. For more information, see Create mapping tables.
Parameters
Parameter | Description |
query | The SQL statement. Specify the parameter based on the required feature. |
Example
Execute the describe test_table statement to query information about the table named test_table.
def get_table_desc(client):
query = 'describe test_table'
rowlist, _, _ = client.exe_sql_query(query)
ret = []
for row in rowlist:
ret.append(row.attribute_columns)
print(ret)
The following output is returned:
[[('Field', 'pk'), ('Type', 'varchar(1024)'), ('Null', 'NO'), ('Key', 'PRI'), ('Default', None), ('Extra', '')],
[('Field', 'long_value'), ('Type', 'bigint(20)'), ('Null', 'YES'), ('Key', ''), ('Default', None), ('Extra', '')],
[('Field', 'double_value'), ('Type', 'double'), ('Null', 'YES'), ('Key', ''), ('Default', None), ('Extra', '')],
[('Field', 'string_value'), ('Type', 'mediumtext'), ('Null', 'YES'), ('Key', ''), ('Default', None), ('Extra', '')],
[('Field', 'bool_value'), ('Type', 'tinyint(1)'), ('Null', 'YES'), ('Key', ''), ('Default', None), ('Extra', '')]]