Execution properties may also be set on the connection by using the SET statement. The SET statement is not yet a language feature of Teiid and is handled only in the JDBC client.
SET Syntax:
SET [PAYLOAD] (parameter|SESSION AUTHORIZATION) value
Syntax Rules:
The parameter must be a non-quoted identifier - it cannot contain spaces.
The value may be either a non-quoted identifier or a quoted string literal value.
If payload is specified, e.g. "SET PAYLOAD x y", then a session scoped payload properties object will have the corresponding name value pair set. The payload object is not fully session scoped. It will be removed from the session when the XAConnection handle is closed / returned to the pool (assumes the use of TeiidDataSource). The session scoped payload is superseded by the usage of TeiidStatement.setPayload.
The SET statement is most commonly used to control planning and execution.
SET SHOWPLAN (ON|DEBUG|OFF)
SET NOEXEC (ON|OFF)
Statement s = connection.createStatement();
s.execute("SET SHOWPLAN DEBUG");
...
Statement s1 = connection.createStatement();
ResultSet rs = s1.executeQuery("select col from table");
ResultSet planRs = s1.exeuteQuery("SHOW PLAN");
planRs.next();
String debugLog = planRs.getString("DEBUG_LOG");
The SET statement may also be used to control authorization. A SET SESSION AUTHORIZATION statement will perform a Reauthentication given the credentials currently set on the connection. The connection credentials may be changed by issuing a SET PASSWORD statement. A SET PASSWORD statement does not perform a reauthentication.
Statement s = connection.createStatement();
s.execute("SET PASSWORD 'someval'");
s.execute("SET SESSION AUTHORIZATION 'newuser'");