Async command

The Async command lets you execute an SQL statement in a separate thread.

This command is used in conjunction with the Wait For command to get the results.


ASYNC Identifier String

You supply the SQL statement, which is any valid SQL statement, as a String. The Identifier you must supply for the async SQL statement is used in the Wait For command and is a case-insensitive ij identifier. An identifier that does not specify a connectionName must not be the same as any other identifier for an async statement on the current connection; an identifier that specifies a connectionName must not be the same as any other identifier for an async statement on the designated connection. You cannot reference a statement previously prepared and named by the ij Prepare command in this command.

ij creates a new thread in the current or designated connection to issue the SQL statement. The separate thread is closed once the statement completes.


ij> async aInsert 'INSERT into menu values (''entree'',''chicken'',11)';
ij> INSERT INTO menu VALUES ('dessert','ice cream',3);
1 rows inserted/updated/deleted.
ij> wait for aInsert;
1 rows inserted/updated/deleted.
-- the result of the asynchronous insert
ij> connect 'jdbc:derby:memory:dummy;create=true;user=john'
    as john_conn;
ij> create table john_tbl (c int);
0 rows inserted/updated/deleted
ij> insert into john_tbl values(1),(2),(3);
3 rows inserted/updated/deleted
ij> connect 'jdbc:derby:memory:dummy;user=fred' as fred_conn;
ij(FRED_CONN)> async john_async @ john_conn 'select * from john_tbl';
ij(FRED_CONN)> wait for john_async @ john_conn;

3 rows selected
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