查看对象

gsql工具提供了若干高级特性，便于用户使用。常见用法如下：

  • 查看命令帮助信息

    1. \h [NAME]

    例如，查询ABORT的所有语法。

    1. openGauss=# \h ABORT
    2. Command:     ABORT
    3. Description: abort the current transaction
    4. Syntax:
    5. ABORT [ WORK | TRANSACTION ] ;

  • 切换数据库

    1. \c dbname

    例如，将postgres数据库切换为数据库db_tpcc。

    1. openGauss=# \c db_tpcc
    2. Non-SSL connection (SSL connection is recommended when requiring high-security)
    3. You are now connected to database "db_tpcc" as user "omm".
    4. db_tpcc=#

  • 查询所有数据库

    1. \l

    示例如下。

    1. openGauss=# \l
    2.                           List of databases
    3.    Name    | Owner | Encoding  | Collate | Ctype | Access privileges
    4. -----------+-------+-----------+---------+-------+-------------------
    5.  mydb      | omm   | GBK       | C       | C     |
    6.  postgres  | omm   | SQL_ASCII | C       | C     |
    7.  template0 | omm   | SQL_ASCII | C       | C     | =c/omm           +
    8.            |       |           |         |       | omm=CTc/omm
    9.  template1 | omm   | SQL_ASCII | C       | C     | =c/omm           +
    10.            |       |           |         |       | omm=CTc/omm
    11. (4 rows)

  • 查询当前数据库中的所有表

    1. \dt

    示例如下。

    1. openGauss=# \dt
    2.                               List of relations
    3.  Schema |      Name       | Type  | Owner |             Storage
    4. --------+-----------------+-------+-------+----------------------------------
    5.  public | customer_t1     | table | omm   | {orientation=row,compression=no}
    6.  public | customer_t1_bak | table | omm   | {orientation=row,compression=no}
    7. (2 rows)

  • 查看表结构

    1. \d tablename

    例如，查看表customer_t1的表结构。

    1. openGauss=# \d customer_t1
    2.         Table "public.customer_t1"
    3.     Column     |     Type     | Modifiers
    4. ---------------+--------------+-----------
    5.  c_customer_sk | integer      |
    6.  c_customer_id | character(5) |
    7.  c_first_name  | character(6) |
    8.  c_last_name   | character(8) |
    9.  amount        | integer      |