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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 ::=
  identifier

Supplement

  • When databaseName is not specified, the default is the currently used DATABASE. If DATABASE 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