CONNECT returns error "Unsupported command" when encountering "if exists(select * from table) then" statement in stored procedure.
Welcome to the MariaDB monitor. Commands end with ; or \g.
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Your MariaDB connection id is 10
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Server version: 10.0.17-MariaDB mariadb.org binary distribution
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Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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MariaDB [(none)]> use test
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Database changed
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MariaDB [test]> show create table test\G
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*************************** 1. row ***************************
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Table: test
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Create Table: CREATE TABLE `test` (
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`col1` int(10) DEFAULT NULL,
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`col2` varchar(255) DEFAULT NULL,
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`col3` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAM
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P
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) ENGINE=CONNECT DEFAULT CHARSET=latin1 CONNECTION='DSN=CCRDB01-WH_FDB_1;uid=username;pwd=password' `TABLE_TYPE`='ODBC' `BLOCK_SIZE`=10
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1 row in set (0.00 sec)
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MariaDB [test]> delimiter ;;
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MariaDB [test]> CREATE PROCEDURE `connect_if_exists_test`()
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-> LANGUAGE SQL
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-> NOT DETERMINISTIC
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-> CONTAINS SQL
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-> SQL SECURITY DEFINER
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-> COMMENT ''
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-> BEGIN
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->
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-> if (exists(select * from test)) then
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-> select 1;
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-> else
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-> select 0;
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-> end if;
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-> END;;
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Query OK, 0 rows affected (0.01 sec)
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MariaDB [test]>
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MariaDB [test]> delimiter ;
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MariaDB [test]> call connect_if_exists_test()\G
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ERROR 1148 (42000): CONNECT Unsupported command
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MariaDB [test]>
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The problem is most likely caused by the IF statement and not the "EXISTS" statement as the IF function can be used as a workaround. Like "if(exists(select * from test), true, false)". If this workaround is used, one should take note of issue MDEV-7616.
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