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
CountReadwriteSplittingRule::=
'COUNT' 'READWRITE_SPLITTING' 'RULE' ('FROM' databaseName)?
databaseName ::=
identifierSupplement
- When
databaseNameis not specified, the default is the currently usedDATABASE. IfDATABASEis not used,No database selectedwill 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