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TencentDB for TcaplusDB

DocumentaçãoTencentDB for TcaplusDBCliente do TcaplusDBComandos da ferramenta do clientedesc

desc

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Última atualização: 2024-12-04 10:23:03

Visão geral

Este comando é usado para exibir as informações de definição da tabela. Para um campo aninhado, você só pode ver que seu atributo é do tipo aninhado, mas não pode ver a definição da estrutura aninhada.

Sintaxe

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

Parâmetros

Parâmetro
Protobuf
TDR
table
Nome da tabela
Nome da tabela
table.field
Não aceito
Para mostrar a estrutura de um campo aninhado, using tdr precisa ser usado junto com esse parâmetro.
using tdr
Não aceito
Esse parâmetro é usado para consultar a estrutura da tabela de um arquivo TDR que deve ser fornecido quando o cliente é iniciado.

Erros

Para obter mais informações, consulte Códigos de erro.

Exemplo

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)
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