sl@0: # 2008 July 11
sl@0: #
sl@0: # The author disclaims copyright to this source code.  In place of
sl@0: # a legal notice, here is a blessing:
sl@0: #
sl@0: #    May you do good and not evil.
sl@0: #    May you find forgiveness for yourself and forgive others.
sl@0: #    May you share freely, never taking more than you give.
sl@0: #
sl@0: #***********************************************************************
sl@0: # This file implements regression tests for SQLite library.
sl@0: #
sl@0: # This file experiments with recursion using the "test_eval()" SQL function
sl@0: # in order to make sure that SQLite is reentrant.
sl@0: #
sl@0: # $Id: eval.test,v 1.1 2008/07/11 21:02:54 drh Exp $
sl@0: 
sl@0: set testdir [file dirname $argv0]
sl@0: source $testdir/tester.tcl
sl@0: 
sl@0: # Create a table to work with.
sl@0: #
sl@0: do_test eval-1.1 {
sl@0:   execsql {
sl@0:     CREATE TABLE t1(x INTEGER PRIMARY KEY); 
sl@0:     INSERT INTO t1 VALUES(1);
sl@0:     INSERT INTO t1 VALUES(2);
sl@0:     INSERT INTO t1 SELECT x+2 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+4 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+8 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+16 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+32 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+64 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+128 FROM t1;
sl@0:     INSERT INTO t1 SELECT x+256 FROM t1;
sl@0:     SELECT count(*), max(x) FROM t1;
sl@0:   }
sl@0: } {512 512}
sl@0: do_test eval-1.2 {
sl@0:   execsql {
sl@0:     SELECT x, test_eval('SELECT max(x) FROM t1 WHERE x<' || x) FROM t1 LIMIT 5
sl@0:   }
sl@0: } {1 {} 2 1 3 2 4 3 5 4}
sl@0: 
sl@0: # Delete a row out from under a read cursor in the middle of
sl@0: # collecting the arguments for a single row in a result set.
sl@0: # Verify that subsequent rows come out as NULL.
sl@0: #
sl@0: do_test eval-2.1 {
sl@0:   execsql {
sl@0:     CREATE TABLE t2(x,y);
sl@0:     INSERT INTO t2 SELECT x, x+1 FROM t1 WHERE x<5;
sl@0:     SELECT x, test_eval('DELETE FROM t2 WHERE x='||x), y FROM t2;
sl@0:   }
sl@0: } {1 {} {} 2 {} {} 3 {} {} 4 {} {}}
sl@0: do_test eval-2.2 {
sl@0:   execsql {
sl@0:     SELECT * FROM t2
sl@0:   }
sl@0: } {}
sl@0: 
sl@0: # Modify a row while it is being read.
sl@0: #
sl@0: do_test eval-3.1 {
sl@0:   execsql {
sl@0:     INSERT INTO t2 SELECT x, x+1 FROM t1 WHERE x<5;
sl@0:     SELECT x, test_eval('UPDATE t2 SET y=y+100 WHERE x='||x), y FROM t2;
sl@0:   }
sl@0: } {1 {} 102 2 {} 103 3 {} 104 4 {} 105}
sl@0: 
sl@0: finish_test