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mysql数据库信息函数

mysql数据库 函数 信息
2023-06-13 09:11:17 时间

打开mysql官方文档:Information Functions

可以看到mysql查询库表信息的函数

Name

Description

BENCHMARK()

Repeatedly execute an expression

CHARSET()

Return the character set of the argument

COERCIBILITY()

Return the collation coercibility value of the string argument

COLLATION()

Return the collation of the string argument

CONNECTION_ID()

Return the connection ID (thread ID) for the connection

CURRENT_ROLE()

Return the current active roles

CURRENT_USER(), CURRENT_USER

The authenticated user name and host name

DATABASE()

Return the default (current) database name

FOUND_ROWS()

For a SELECT with a LIMIT clause, the number of rows that would be returned were there no LIMIT clause

ICU_VERSION()

ICU library version

LAST_INSERT_ID()

Value of the AUTOINCREMENT column for the last INSERT

ROLES_GRAPHML()

Return a GraphML document representing memory role subgraphs

ROW_COUNT()

The number of rows updated

SCHEMA()

Synonym for DATABASE()

SESSION_USER()

Synonym for USER()

SYSTEM_USER()

Synonym for USER()

USER()

The user name and host name provided by the client

VERSION()

Return a string that indicates the MySQL server version

除了USERVERSIONLAST_INSERT_ID以外等常用函数还有DATABASE

这个可以用于获取当前USE的数据库

例如获取当前数据库中的所有表,sql如下:

select * from information_schema.tables where table_schema = (select database());

这些函数常用的场景如代码生成器和数据库备份维护应用等