tencent cloud

TencentDB for TcaplusDB

Release Notes
Product Introduction
Product Overview
Benefits
Use Cases
Architecture
Regions
Purchase Guide
Product Pricing
Payment Overdue
Getting Started
Basic Concepts
Creating Cluster
Creating Table Group
Creating Table
Get Connection Information
Accessing TcaplusDB
Operation Guide
Managing Cluster and Table Group
Managing Table
Monitoring and Alarming
Access Management
Tag
Task List
TcaplusDB Client
Accessing by Client Tool
Client Tool Commands
TcaplusDB SDK
Release History
SDK Download
C++ SDK API
TcaplusDB Error Codes
SDK Installation
Directions for Protobuf Table SDK for C++
Directions for TDR Table SDK for C++
TcaplusDB RESTful APIs
Description
Go
Java
PHP
Python
Downloading RESTful API Samples in Multiple Languages
Practical Tutorial
Best Practice for Table Structure Design
Best Practice for Database Interaction
FAQs
Database Features
Database Use
Database Principles
API Documentation
History
Introduction
API Category
Making API Requests
Table Group APIs
Other APIs
Table APIs
Cluster APIs
Data Types
Error Codes
Service Agreement
Service Level Agreement
Terms of Service
Glossary
Contact Us
문서TencentDB for TcaplusDBTcaplusDB ClientClient Tool Commandsdesc

desc

PDF
포커스 모드
폰트 크기
마지막 업데이트 시간: 2024-12-04 10:12:05

Overview

This command is used to view the table definition information. For a nested field, you can only see that its attribute is nested type, but you cannot view the nested structure definition.

Syntax

desc [table]/[table.field] [using tdr];

Parameters

Parameter
Protobuf
TDR
table
Table name
Table name
table.field
Not supported
To show the structure of a nested field, using tdr needs to be used along with this parameter.
using tdr
Not supported
This parameter is used to query the table structure from a TDR file which must be provided when the client is launched.

Errors

For more information, please see Error Codes.

Sample

tcaplus> desc table_list;

Table Structure From: Tcaplus System
TableName: table_list
TableType: LIST, IdlType: TDRXML
SvrTdrCurrentVersion: 5
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|Field                |Type                |Key     |Index|Size  |Version|DefaultValue|Count|Select               |Desc          |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|uin                  |unsigned long long  |PRI,SPLT|-    |8     |1      |-           |1    |-                    |QQ            |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|name                 |string              |PRI     |-    |640   |1      |-           |1    |-                    |Name          |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|key1                 |unsigned char       |PRI     |-    |1     |1      |-           |1    |-                    |key4          |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|level                |int                 |-       |-    |4     |1      |1           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|count                |unsigned char       |-       |-    |1     |1      |0           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|array_count          |unsigned int        |-       |-    |4     |1      |1           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|items                |unsigned long long[]|-       |-    |8     |1      |-           |10   |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_int8               |char                |-       |-    |1     |1      |-1          |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_uint8              |unsigned char       |-       |-    |1     |1      |2           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_int16              |short               |-       |-    |2     |1      |-3          |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_uint16             |unsigned short      |-       |-    |2     |1      |4           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_int32              |int                 |-       |-    |4     |1      |-5          |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_uint32             |unsigned int        |-       |-    |4     |1      |6           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_int64              |long long           |-       |-    |8     |1      |-7          |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_uint64             |unsigned long long  |-       |-    |8     |1      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_float              |float               |-       |-    |4     |2      |1.234568    |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_double             |double              |-       |-    |8     |3      |9.876543    |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_string             |string              |-       |-    |200   |3      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_string_128K        |string              |-       |-    |131072|1      |123456789   |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_string_256K        |string              |-       |-    |262144|1      |123456789   |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_binary             |char[]              |-       |-    |1     |1      |-           |10   |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|binary               |char                |-       |-    |1     |5      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|selector             |short               |-       |-    |2     |1      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|single_struct        |struct_type         |-       |-    |119   |1      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|simple_struct        |simple_struct       |-       |-    |30    |4      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|single_union_selector|char                |-       |-    |1     |1      |0           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|single_union         |union_type          |-       |-    |64    |1      |-           |1    |single_union_selector|-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|array                |TableInfo[]         |-       |-    |125   |1      |-           |3    |-                    |three lyaer struct|
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_union              |union_type          |-       |-    |64    |1      |-           |1    |selector             |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|union_array          |union_type[]        |-       |-    |64    |1      |-           |3    |selector             |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|c_struct             |struct_type         |-       |-    |119   |1      |-           |1    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+
|struct_array         |struct_type[]       |-       |-    |119   |1      |-           |3    |-                    |-             |
+---------------------+--------------------+--------+-----+------+-------+------------+-----+---------------------+--------------+

32 rows in set (36252 us)

tcaplus> desc table_list.single_struct using tdr;

Table Structure From: Local tdr file(/mnt/e/tdr/2.3.table_list.tdr)
table_list.single_struct
|---single_struct(struct)
|   |---x(int)
|   |---y(int)
|   |---score(double)
|   |---rank(uchar)
|   |---title(string)
|   |---level2_struct(struct)
|   |   |---uin(int)
|   |   |---name(string)
이전 주제: show다음 주제: count

도움말 및 지원

문제 해결에 도움이 되었나요?

피드백