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 used DATABASE. If DATABASE is not used, No database selected will be prompted.

Return value description

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

• Reserved word