COUNT READWRITE_SPLITTING RULE
Description
The COUNT READWRITE_SPLITTING RULE
syntax is used to query the number of readwrite splitting rules for specified database.
Syntax
Grammar Railroad diagram
CountReadwriteSplittingRule::=
'COUNT' 'READWRITE_SPLITTING' 'RULE' ('FROM' databaseName)?
databaseName ::=
identifier
Supplement
- When
databaseName
is not specified, the default is the currently usedDATABASE
. IfDATABASE
is not used,No database selected
will be prompted.
Return value description
Column | Description |
---|---|
rule_name | rule type |
database | the database to which the rule belongs |
count | the number of the rule |
Example
- Query the number of readwrite splitting rules for specified database.
COUNT READWRITE_SPLITTING RULE FROM readwrite_splitting_db;
mysql> COUNT READWRITE_SPLITTING RULE FROM readwrite_splitting_db;
+---------------------+---------------------------+-------+
| rule_name | database | count |
+---------------------+---------------------------+-------+
| readwrite_splitting | readwrite_splitting_db | 1 |
+---------------------+---------------------------+-------+
1 row in set (0.02 sec)
- Query the number of readwrite splitting rules for current database.
COUNT READWRITE_SPLITTING RULE;
mysql> COUNT READWRITE_SPLITTING RULE;
+---------------------+---------------------------+-------+
| rule_name | database | count |
+---------------------+---------------------------+-------+
| readwrite_splitting | readwrite_splitting_db | 1 |
+---------------------+---------------------------+-------+
1 row in set (0.00 sec)
Reserved word
COUNT
, READWRITE_SPLITTING
, RULE
, FROM
Related links
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